Merge tag 'trace-3.10' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace
Pull tracing updates from Steven Rostedt:
"Along with the usual minor fixes and clean ups there are a few major
changes with this pull request.
1) Multiple buffers for the ftrace facility
This feature has been requested by many people over the last few
years. I even heard that Google was about to implement it themselves.
I finally had time and cleaned up the code such that you can now
create multiple instances of the ftrace buffer and have different
events go to different buffers. This way, a low frequency event will
not be lost in the noise of a high frequency event.
Note, currently only events can go to different buffers, the tracers
(ie function, function_graph and the latency tracers) still can only
be written to the main buffer.
2) The function tracer triggers have now been extended.
The function tracer had two triggers. One to enable tracing when a
function is hit, and one to disable tracing. Now you can record a
stack trace on a single (or many) function(s), take a snapshot of the
buffer (copy it to the snapshot buffer), and you can enable or disable
an event to be traced when a function is hit.
3) A perf clock has been added.
A "perf" clock can be chosen to be used when tracing. This will cause
ftrace to use the same clock as perf uses, and hopefully this will
make it easier to interleave the perf and ftrace data for analysis."
* tag 'trace-3.10' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace: (82 commits)
tracepoints: Prevent null probe from being added
tracing: Compare to 1 instead of zero for is_signed_type()
tracing: Remove obsolete macro guard _TRACE_PROFILE_INIT
ftrace: Get rid of ftrace_profile_bits
tracing: Check return value of tracing_init_dentry()
tracing: Get rid of unneeded key calculation in ftrace_hash_move()
tracing: Reset ftrace_graph_filter_enabled if count is zero
tracing: Fix off-by-one on allocating stat->pages
kernel: tracing: Use strlcpy instead of strncpy
tracing: Update debugfs README file
tracing: Fix ftrace_dump()
tracing: Rename trace_event_mutex to trace_event_sem
tracing: Fix comment about prefix in arch_syscall_match_sym_name()
tracing: Convert trace_destroy_fields() to static
tracing: Move find_event_field() into trace_events.c
tracing: Use TRACE_MAX_PRINT instead of constant
tracing: Use pr_warn_once instead of open coded implementation
ring-buffer: Add ring buffer startup selftest
tracing: Bring Documentation/trace/ftrace.txt up to date
tracing: Add "perf" trace_clock
...
Conflicts:
kernel/trace/ftrace.c
kernel/trace/trace.c
diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index 66338c4..581630a 100644
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -1,7 +1,7 @@
/*
* ring buffer based function tracer
*
- * Copyright (C) 2007-2008 Steven Rostedt <srostedt@redhat.com>
+ * Copyright (C) 2007-2012 Steven Rostedt <srostedt@redhat.com>
* Copyright (C) 2008 Ingo Molnar <mingo@redhat.com>
*
* Originally taken from the RT patch by:
@@ -19,7 +19,6 @@
#include <linux/seq_file.h>
#include <linux/notifier.h>
#include <linux/irqflags.h>
-#include <linux/irq_work.h>
#include <linux/debugfs.h>
#include <linux/pagemap.h>
#include <linux/hardirq.h>
@@ -48,7 +47,7 @@
* On boot up, the ring buffer is set to the minimum size, so that
* we do not waste memory on systems that are not using tracing.
*/
-int ring_buffer_expanded;
+bool ring_buffer_expanded;
/*
* We need to change this state when a selftest is running.
@@ -87,14 +86,6 @@
static DEFINE_PER_CPU(bool, trace_cmdline_save);
/*
- * When a reader is waiting for data, then this variable is
- * set to true.
- */
-static bool trace_wakeup_needed;
-
-static struct irq_work trace_work_wakeup;
-
-/*
* Kill all tracing for good (never come back).
* It is initialized to 1 but will turn to zero if the initialization
* of the tracer is successful. But that is the only place that sets
@@ -130,12 +121,14 @@
static char bootup_tracer_buf[MAX_TRACER_SIZE] __initdata;
static char *default_bootup_tracer;
+static bool allocate_snapshot;
+
static int __init set_cmdline_ftrace(char *str)
{
strlcpy(bootup_tracer_buf, str, MAX_TRACER_SIZE);
default_bootup_tracer = bootup_tracer_buf;
/* We are using ftrace early, expand it */
- ring_buffer_expanded = 1;
+ ring_buffer_expanded = true;
return 1;
}
__setup("ftrace=", set_cmdline_ftrace);
@@ -156,6 +149,15 @@
}
__setup("ftrace_dump_on_oops", set_ftrace_dump_on_oops);
+static int __init boot_alloc_snapshot(char *str)
+{
+ allocate_snapshot = true;
+ /* We also need the main ring buffer expanded */
+ ring_buffer_expanded = true;
+ return 1;
+}
+__setup("alloc_snapshot", boot_alloc_snapshot);
+
static char trace_boot_options_buf[MAX_TRACER_SIZE] __initdata;
static char *trace_boot_options __initdata;
@@ -189,7 +191,7 @@
*/
static struct trace_array global_trace;
-static DEFINE_PER_CPU(struct trace_array_cpu, global_trace_cpu);
+LIST_HEAD(ftrace_trace_arrays);
int filter_current_check_discard(struct ring_buffer *buffer,
struct ftrace_event_call *call, void *rec,
@@ -204,29 +206,15 @@
u64 ts;
/* Early boot up does not have a buffer yet */
- if (!global_trace.buffer)
+ if (!global_trace.trace_buffer.buffer)
return trace_clock_local();
- ts = ring_buffer_time_stamp(global_trace.buffer, cpu);
- ring_buffer_normalize_time_stamp(global_trace.buffer, cpu, &ts);
+ ts = ring_buffer_time_stamp(global_trace.trace_buffer.buffer, cpu);
+ ring_buffer_normalize_time_stamp(global_trace.trace_buffer.buffer, cpu, &ts);
return ts;
}
-/*
- * The max_tr is used to snapshot the global_trace when a maximum
- * latency is reached. Some tracers will use this to store a maximum
- * trace while it continues examining live traces.
- *
- * The buffers for the max_tr are set up the same as the global_trace.
- * When a snapshot is taken, the link list of the max_tr is swapped
- * with the link list of the global_trace and the buffers are reset for
- * the global_trace so the tracing can continue.
- */
-static struct trace_array max_tr;
-
-static DEFINE_PER_CPU(struct trace_array_cpu, max_tr_data);
-
int tracing_is_enabled(void)
{
return tracing_is_on();
@@ -249,9 +237,6 @@
/* trace_types holds a link list of available tracers. */
static struct tracer *trace_types __read_mostly;
-/* current_trace points to the tracer that is currently active */
-static struct tracer *current_trace __read_mostly = &nop_trace;
-
/*
* trace_types_lock is used to protect the trace_types list.
*/
@@ -285,13 +270,13 @@
static inline void trace_access_lock(int cpu)
{
- if (cpu == TRACE_PIPE_ALL_CPU) {
+ if (cpu == RING_BUFFER_ALL_CPUS) {
/* gain it for accessing the whole ring buffer. */
down_write(&all_cpu_access_lock);
} else {
/* gain it for accessing a cpu ring buffer. */
- /* Firstly block other trace_access_lock(TRACE_PIPE_ALL_CPU). */
+ /* Firstly block other trace_access_lock(RING_BUFFER_ALL_CPUS). */
down_read(&all_cpu_access_lock);
/* Secondly block other access to this @cpu ring buffer. */
@@ -301,7 +286,7 @@
static inline void trace_access_unlock(int cpu)
{
- if (cpu == TRACE_PIPE_ALL_CPU) {
+ if (cpu == RING_BUFFER_ALL_CPUS) {
up_write(&all_cpu_access_lock);
} else {
mutex_unlock(&per_cpu(cpu_access_lock, cpu));
@@ -339,30 +324,11 @@
#endif
-/* trace_wait is a waitqueue for tasks blocked on trace_poll */
-static DECLARE_WAIT_QUEUE_HEAD(trace_wait);
-
/* trace_flags holds trace_options default values */
unsigned long trace_flags = TRACE_ITER_PRINT_PARENT | TRACE_ITER_PRINTK |
TRACE_ITER_ANNOTATE | TRACE_ITER_CONTEXT_INFO | TRACE_ITER_SLEEP_TIME |
TRACE_ITER_GRAPH_TIME | TRACE_ITER_RECORD_CMD | TRACE_ITER_OVERWRITE |
- TRACE_ITER_IRQ_INFO | TRACE_ITER_MARKERS;
-
-static int trace_stop_count;
-static DEFINE_RAW_SPINLOCK(tracing_start_lock);
-
-/**
- * trace_wake_up - wake up tasks waiting for trace input
- *
- * Schedules a delayed work to wake up any task that is blocked on the
- * trace_wait queue. These is used with trace_poll for tasks polling the
- * trace.
- */
-static void trace_wake_up(struct irq_work *work)
-{
- wake_up_all(&trace_wait);
-
-}
+ TRACE_ITER_IRQ_INFO | TRACE_ITER_MARKERS | TRACE_ITER_FUNCTION;
/**
* tracing_on - enable tracing buffers
@@ -372,8 +338,8 @@
*/
void tracing_on(void)
{
- if (global_trace.buffer)
- ring_buffer_record_on(global_trace.buffer);
+ if (global_trace.trace_buffer.buffer)
+ ring_buffer_record_on(global_trace.trace_buffer.buffer);
/*
* This flag is only looked at when buffers haven't been
* allocated yet. We don't really care about the race
@@ -385,6 +351,196 @@
EXPORT_SYMBOL_GPL(tracing_on);
/**
+ * __trace_puts - write a constant string into the trace buffer.
+ * @ip: The address of the caller
+ * @str: The constant string to write
+ * @size: The size of the string.
+ */
+int __trace_puts(unsigned long ip, const char *str, int size)
+{
+ struct ring_buffer_event *event;
+ struct ring_buffer *buffer;
+ struct print_entry *entry;
+ unsigned long irq_flags;
+ int alloc;
+
+ alloc = sizeof(*entry) + size + 2; /* possible \n added */
+
+ local_save_flags(irq_flags);
+ buffer = global_trace.trace_buffer.buffer;
+ event = trace_buffer_lock_reserve(buffer, TRACE_PRINT, alloc,
+ irq_flags, preempt_count());
+ if (!event)
+ return 0;
+
+ entry = ring_buffer_event_data(event);
+ entry->ip = ip;
+
+ memcpy(&entry->buf, str, size);
+
+ /* Add a newline if necessary */
+ if (entry->buf[size - 1] != '\n') {
+ entry->buf[size] = '\n';
+ entry->buf[size + 1] = '\0';
+ } else
+ entry->buf[size] = '\0';
+
+ __buffer_unlock_commit(buffer, event);
+
+ return size;
+}
+EXPORT_SYMBOL_GPL(__trace_puts);
+
+/**
+ * __trace_bputs - write the pointer to a constant string into trace buffer
+ * @ip: The address of the caller
+ * @str: The constant string to write to the buffer to
+ */
+int __trace_bputs(unsigned long ip, const char *str)
+{
+ struct ring_buffer_event *event;
+ struct ring_buffer *buffer;
+ struct bputs_entry *entry;
+ unsigned long irq_flags;
+ int size = sizeof(struct bputs_entry);
+
+ local_save_flags(irq_flags);
+ buffer = global_trace.trace_buffer.buffer;
+ event = trace_buffer_lock_reserve(buffer, TRACE_BPUTS, size,
+ irq_flags, preempt_count());
+ if (!event)
+ return 0;
+
+ entry = ring_buffer_event_data(event);
+ entry->ip = ip;
+ entry->str = str;
+
+ __buffer_unlock_commit(buffer, event);
+
+ return 1;
+}
+EXPORT_SYMBOL_GPL(__trace_bputs);
+
+#ifdef CONFIG_TRACER_SNAPSHOT
+/**
+ * trace_snapshot - take a snapshot of the current buffer.
+ *
+ * This causes a swap between the snapshot buffer and the current live
+ * tracing buffer. You can use this to take snapshots of the live
+ * trace when some condition is triggered, but continue to trace.
+ *
+ * Note, make sure to allocate the snapshot with either
+ * a tracing_snapshot_alloc(), or by doing it manually
+ * with: echo 1 > /sys/kernel/debug/tracing/snapshot
+ *
+ * If the snapshot buffer is not allocated, it will stop tracing.
+ * Basically making a permanent snapshot.
+ */
+void tracing_snapshot(void)
+{
+ struct trace_array *tr = &global_trace;
+ struct tracer *tracer = tr->current_trace;
+ unsigned long flags;
+
+ if (in_nmi()) {
+ internal_trace_puts("*** SNAPSHOT CALLED FROM NMI CONTEXT ***\n");
+ internal_trace_puts("*** snapshot is being ignored ***\n");
+ return;
+ }
+
+ if (!tr->allocated_snapshot) {
+ internal_trace_puts("*** SNAPSHOT NOT ALLOCATED ***\n");
+ internal_trace_puts("*** stopping trace here! ***\n");
+ tracing_off();
+ return;
+ }
+
+ /* Note, snapshot can not be used when the tracer uses it */
+ if (tracer->use_max_tr) {
+ internal_trace_puts("*** LATENCY TRACER ACTIVE ***\n");
+ internal_trace_puts("*** Can not use snapshot (sorry) ***\n");
+ return;
+ }
+
+ local_irq_save(flags);
+ update_max_tr(tr, current, smp_processor_id());
+ local_irq_restore(flags);
+}
+EXPORT_SYMBOL_GPL(tracing_snapshot);
+
+static int resize_buffer_duplicate_size(struct trace_buffer *trace_buf,
+ struct trace_buffer *size_buf, int cpu_id);
+static void set_buffer_entries(struct trace_buffer *buf, unsigned long val);
+
+static int alloc_snapshot(struct trace_array *tr)
+{
+ int ret;
+
+ if (!tr->allocated_snapshot) {
+
+ /* allocate spare buffer */
+ ret = resize_buffer_duplicate_size(&tr->max_buffer,
+ &tr->trace_buffer, RING_BUFFER_ALL_CPUS);
+ if (ret < 0)
+ return ret;
+
+ tr->allocated_snapshot = true;
+ }
+
+ return 0;
+}
+
+void free_snapshot(struct trace_array *tr)
+{
+ /*
+ * We don't free the ring buffer. instead, resize it because
+ * The max_tr ring buffer has some state (e.g. ring->clock) and
+ * we want preserve it.
+ */
+ ring_buffer_resize(tr->max_buffer.buffer, 1, RING_BUFFER_ALL_CPUS);
+ set_buffer_entries(&tr->max_buffer, 1);
+ tracing_reset_online_cpus(&tr->max_buffer);
+ tr->allocated_snapshot = false;
+}
+
+/**
+ * trace_snapshot_alloc - allocate and take a snapshot of the current buffer.
+ *
+ * This is similar to trace_snapshot(), but it will allocate the
+ * snapshot buffer if it isn't already allocated. Use this only
+ * where it is safe to sleep, as the allocation may sleep.
+ *
+ * This causes a swap between the snapshot buffer and the current live
+ * tracing buffer. You can use this to take snapshots of the live
+ * trace when some condition is triggered, but continue to trace.
+ */
+void tracing_snapshot_alloc(void)
+{
+ struct trace_array *tr = &global_trace;
+ int ret;
+
+ ret = alloc_snapshot(tr);
+ if (WARN_ON(ret < 0))
+ return;
+
+ tracing_snapshot();
+}
+EXPORT_SYMBOL_GPL(tracing_snapshot_alloc);
+#else
+void tracing_snapshot(void)
+{
+ WARN_ONCE(1, "Snapshot feature not enabled, but internal snapshot used");
+}
+EXPORT_SYMBOL_GPL(tracing_snapshot);
+void tracing_snapshot_alloc(void)
+{
+ /* Give warning */
+ tracing_snapshot();
+}
+EXPORT_SYMBOL_GPL(tracing_snapshot_alloc);
+#endif /* CONFIG_TRACER_SNAPSHOT */
+
+/**
* tracing_off - turn off tracing buffers
*
* This function stops the tracing buffers from recording data.
@@ -394,8 +550,8 @@
*/
void tracing_off(void)
{
- if (global_trace.buffer)
- ring_buffer_record_off(global_trace.buffer);
+ if (global_trace.trace_buffer.buffer)
+ ring_buffer_record_off(global_trace.trace_buffer.buffer);
/*
* This flag is only looked at when buffers haven't been
* allocated yet. We don't really care about the race
@@ -411,8 +567,8 @@
*/
int tracing_is_on(void)
{
- if (global_trace.buffer)
- return ring_buffer_record_is_on(global_trace.buffer);
+ if (global_trace.trace_buffer.buffer)
+ return ring_buffer_record_is_on(global_trace.trace_buffer.buffer);
return !global_trace.buffer_disabled;
}
EXPORT_SYMBOL_GPL(tracing_is_on);
@@ -479,6 +635,7 @@
"disable_on_free",
"irq-info",
"markers",
+ "function-trace",
NULL
};
@@ -490,6 +647,8 @@
{ trace_clock_local, "local", 1 },
{ trace_clock_global, "global", 1 },
{ trace_clock_counter, "counter", 0 },
+ { trace_clock_jiffies, "uptime", 1 },
+ { trace_clock, "perf", 1 },
ARCH_TRACE_CLOCKS
};
@@ -670,13 +829,14 @@
static void
__update_max_tr(struct trace_array *tr, struct task_struct *tsk, int cpu)
{
- struct trace_array_cpu *data = tr->data[cpu];
- struct trace_array_cpu *max_data;
+ struct trace_buffer *trace_buf = &tr->trace_buffer;
+ struct trace_buffer *max_buf = &tr->max_buffer;
+ struct trace_array_cpu *data = per_cpu_ptr(trace_buf->data, cpu);
+ struct trace_array_cpu *max_data = per_cpu_ptr(max_buf->data, cpu);
- max_tr.cpu = cpu;
- max_tr.time_start = data->preempt_timestamp;
+ max_buf->cpu = cpu;
+ max_buf->time_start = data->preempt_timestamp;
- max_data = max_tr.data[cpu];
max_data->saved_latency = tracing_max_latency;
max_data->critical_start = data->critical_start;
max_data->critical_end = data->critical_end;
@@ -706,22 +866,22 @@
{
struct ring_buffer *buf;
- if (trace_stop_count)
+ if (tr->stop_count)
return;
WARN_ON_ONCE(!irqs_disabled());
- if (!current_trace->allocated_snapshot) {
+ if (!tr->allocated_snapshot) {
/* Only the nop tracer should hit this when disabling */
- WARN_ON_ONCE(current_trace != &nop_trace);
+ WARN_ON_ONCE(tr->current_trace != &nop_trace);
return;
}
arch_spin_lock(&ftrace_max_lock);
- buf = tr->buffer;
- tr->buffer = max_tr.buffer;
- max_tr.buffer = buf;
+ buf = tr->trace_buffer.buffer;
+ tr->trace_buffer.buffer = tr->max_buffer.buffer;
+ tr->max_buffer.buffer = buf;
__update_max_tr(tr, tsk, cpu);
arch_spin_unlock(&ftrace_max_lock);
@@ -740,19 +900,19 @@
{
int ret;
- if (trace_stop_count)
+ if (tr->stop_count)
return;
WARN_ON_ONCE(!irqs_disabled());
- if (!current_trace->allocated_snapshot) {
+ if (tr->allocated_snapshot) {
/* Only the nop tracer should hit this when disabling */
- WARN_ON_ONCE(current_trace != &nop_trace);
+ WARN_ON_ONCE(tr->current_trace != &nop_trace);
return;
}
arch_spin_lock(&ftrace_max_lock);
- ret = ring_buffer_swap_cpu(max_tr.buffer, tr->buffer, cpu);
+ ret = ring_buffer_swap_cpu(tr->max_buffer.buffer, tr->trace_buffer.buffer, cpu);
if (ret == -EBUSY) {
/*
@@ -761,7 +921,7 @@
* the max trace buffer (no one writes directly to it)
* and flag that it failed.
*/
- trace_array_printk(&max_tr, _THIS_IP_,
+ trace_array_printk_buf(tr->max_buffer.buffer, _THIS_IP_,
"Failed to swap buffers due to commit in progress\n");
}
@@ -774,37 +934,78 @@
static void default_wait_pipe(struct trace_iterator *iter)
{
- DEFINE_WAIT(wait);
+ /* Iterators are static, they should be filled or empty */
+ if (trace_buffer_iter(iter, iter->cpu_file))
+ return;
- prepare_to_wait(&trace_wait, &wait, TASK_INTERRUPTIBLE);
+ ring_buffer_wait(iter->trace_buffer->buffer, iter->cpu_file);
+}
+
+#ifdef CONFIG_FTRACE_STARTUP_TEST
+static int run_tracer_selftest(struct tracer *type)
+{
+ struct trace_array *tr = &global_trace;
+ struct tracer *saved_tracer = tr->current_trace;
+ int ret;
+
+ if (!type->selftest || tracing_selftest_disabled)
+ return 0;
/*
- * The events can happen in critical sections where
- * checking a work queue can cause deadlocks.
- * After adding a task to the queue, this flag is set
- * only to notify events to try to wake up the queue
- * using irq_work.
- *
- * We don't clear it even if the buffer is no longer
- * empty. The flag only causes the next event to run
- * irq_work to do the work queue wake up. The worse
- * that can happen if we race with !trace_empty() is that
- * an event will cause an irq_work to try to wake up
- * an empty queue.
- *
- * There's no reason to protect this flag either, as
- * the work queue and irq_work logic will do the necessary
- * synchronization for the wake ups. The only thing
- * that is necessary is that the wake up happens after
- * a task has been queued. It's OK for spurious wake ups.
+ * Run a selftest on this tracer.
+ * Here we reset the trace buffer, and set the current
+ * tracer to be this tracer. The tracer can then run some
+ * internal tracing to verify that everything is in order.
+ * If we fail, we do not register this tracer.
*/
- trace_wakeup_needed = true;
+ tracing_reset_online_cpus(&tr->trace_buffer);
- if (trace_empty(iter))
- schedule();
+ tr->current_trace = type;
- finish_wait(&trace_wait, &wait);
+#ifdef CONFIG_TRACER_MAX_TRACE
+ if (type->use_max_tr) {
+ /* If we expanded the buffers, make sure the max is expanded too */
+ if (ring_buffer_expanded)
+ ring_buffer_resize(tr->max_buffer.buffer, trace_buf_size,
+ RING_BUFFER_ALL_CPUS);
+ tr->allocated_snapshot = true;
+ }
+#endif
+
+ /* the test is responsible for initializing and enabling */
+ pr_info("Testing tracer %s: ", type->name);
+ ret = type->selftest(type, tr);
+ /* the test is responsible for resetting too */
+ tr->current_trace = saved_tracer;
+ if (ret) {
+ printk(KERN_CONT "FAILED!\n");
+ /* Add the warning after printing 'FAILED' */
+ WARN_ON(1);
+ return -1;
+ }
+ /* Only reset on passing, to avoid touching corrupted buffers */
+ tracing_reset_online_cpus(&tr->trace_buffer);
+
+#ifdef CONFIG_TRACER_MAX_TRACE
+ if (type->use_max_tr) {
+ tr->allocated_snapshot = false;
+
+ /* Shrink the max buffer again */
+ if (ring_buffer_expanded)
+ ring_buffer_resize(tr->max_buffer.buffer, 1,
+ RING_BUFFER_ALL_CPUS);
+ }
+#endif
+
+ printk(KERN_CONT "PASSED\n");
+ return 0;
}
+#else
+static inline int run_tracer_selftest(struct tracer *type)
+{
+ return 0;
+}
+#endif /* CONFIG_FTRACE_STARTUP_TEST */
/**
* register_tracer - register a tracer with the ftrace system.
@@ -851,57 +1052,9 @@
if (!type->wait_pipe)
type->wait_pipe = default_wait_pipe;
-
-#ifdef CONFIG_FTRACE_STARTUP_TEST
- if (type->selftest && !tracing_selftest_disabled) {
- struct tracer *saved_tracer = current_trace;
- struct trace_array *tr = &global_trace;
-
- /*
- * Run a selftest on this tracer.
- * Here we reset the trace buffer, and set the current
- * tracer to be this tracer. The tracer can then run some
- * internal tracing to verify that everything is in order.
- * If we fail, we do not register this tracer.
- */
- tracing_reset_online_cpus(tr);
-
- current_trace = type;
-
- if (type->use_max_tr) {
- /* If we expanded the buffers, make sure the max is expanded too */
- if (ring_buffer_expanded)
- ring_buffer_resize(max_tr.buffer, trace_buf_size,
- RING_BUFFER_ALL_CPUS);
- type->allocated_snapshot = true;
- }
-
- /* the test is responsible for initializing and enabling */
- pr_info("Testing tracer %s: ", type->name);
- ret = type->selftest(type, tr);
- /* the test is responsible for resetting too */
- current_trace = saved_tracer;
- if (ret) {
- printk(KERN_CONT "FAILED!\n");
- /* Add the warning after printing 'FAILED' */
- WARN_ON(1);
- goto out;
- }
- /* Only reset on passing, to avoid touching corrupted buffers */
- tracing_reset_online_cpus(tr);
-
- if (type->use_max_tr) {
- type->allocated_snapshot = false;
-
- /* Shrink the max buffer again */
- if (ring_buffer_expanded)
- ring_buffer_resize(max_tr.buffer, 1,
- RING_BUFFER_ALL_CPUS);
- }
-
- printk(KERN_CONT "PASSED\n");
- }
-#endif
+ ret = run_tracer_selftest(type);
+ if (ret < 0)
+ goto out;
type->next = trace_types;
trace_types = type;
@@ -921,7 +1074,7 @@
tracing_set_tracer(type->name);
default_bootup_tracer = NULL;
/* disable other selftests, since this will break it. */
- tracing_selftest_disabled = 1;
+ tracing_selftest_disabled = true;
#ifdef CONFIG_FTRACE_STARTUP_TEST
printk(KERN_INFO "Disabling FTRACE selftests due to running tracer '%s'\n",
type->name);
@@ -931,9 +1084,9 @@
return ret;
}
-void tracing_reset(struct trace_array *tr, int cpu)
+void tracing_reset(struct trace_buffer *buf, int cpu)
{
- struct ring_buffer *buffer = tr->buffer;
+ struct ring_buffer *buffer = buf->buffer;
if (!buffer)
return;
@@ -947,9 +1100,9 @@
ring_buffer_record_enable(buffer);
}
-void tracing_reset_online_cpus(struct trace_array *tr)
+void tracing_reset_online_cpus(struct trace_buffer *buf)
{
- struct ring_buffer *buffer = tr->buffer;
+ struct ring_buffer *buffer = buf->buffer;
int cpu;
if (!buffer)
@@ -960,7 +1113,7 @@
/* Make sure all commits have finished */
synchronize_sched();
- tr->time_start = ftrace_now(tr->cpu);
+ buf->time_start = ftrace_now(buf->cpu);
for_each_online_cpu(cpu)
ring_buffer_reset_cpu(buffer, cpu);
@@ -970,12 +1123,21 @@
void tracing_reset_current(int cpu)
{
- tracing_reset(&global_trace, cpu);
+ tracing_reset(&global_trace.trace_buffer, cpu);
}
-void tracing_reset_current_online_cpus(void)
+void tracing_reset_all_online_cpus(void)
{
- tracing_reset_online_cpus(&global_trace);
+ struct trace_array *tr;
+
+ mutex_lock(&trace_types_lock);
+ list_for_each_entry(tr, &ftrace_trace_arrays, list) {
+ tracing_reset_online_cpus(&tr->trace_buffer);
+#ifdef CONFIG_TRACER_MAX_TRACE
+ tracing_reset_online_cpus(&tr->max_buffer);
+#endif
+ }
+ mutex_unlock(&trace_types_lock);
}
#define SAVED_CMDLINES 128
@@ -998,7 +1160,7 @@
int is_tracing_stopped(void)
{
- return trace_stop_count;
+ return global_trace.stop_count;
}
/**
@@ -1030,12 +1192,12 @@
if (tracing_disabled)
return;
- raw_spin_lock_irqsave(&tracing_start_lock, flags);
- if (--trace_stop_count) {
- if (trace_stop_count < 0) {
+ raw_spin_lock_irqsave(&global_trace.start_lock, flags);
+ if (--global_trace.stop_count) {
+ if (global_trace.stop_count < 0) {
/* Someone screwed up their debugging */
WARN_ON_ONCE(1);
- trace_stop_count = 0;
+ global_trace.stop_count = 0;
}
goto out;
}
@@ -1043,19 +1205,52 @@
/* Prevent the buffers from switching */
arch_spin_lock(&ftrace_max_lock);
- buffer = global_trace.buffer;
+ buffer = global_trace.trace_buffer.buffer;
if (buffer)
ring_buffer_record_enable(buffer);
- buffer = max_tr.buffer;
+#ifdef CONFIG_TRACER_MAX_TRACE
+ buffer = global_trace.max_buffer.buffer;
if (buffer)
ring_buffer_record_enable(buffer);
+#endif
arch_spin_unlock(&ftrace_max_lock);
ftrace_start();
out:
- raw_spin_unlock_irqrestore(&tracing_start_lock, flags);
+ raw_spin_unlock_irqrestore(&global_trace.start_lock, flags);
+}
+
+static void tracing_start_tr(struct trace_array *tr)
+{
+ struct ring_buffer *buffer;
+ unsigned long flags;
+
+ if (tracing_disabled)
+ return;
+
+ /* If global, we need to also start the max tracer */
+ if (tr->flags & TRACE_ARRAY_FL_GLOBAL)
+ return tracing_start();
+
+ raw_spin_lock_irqsave(&tr->start_lock, flags);
+
+ if (--tr->stop_count) {
+ if (tr->stop_count < 0) {
+ /* Someone screwed up their debugging */
+ WARN_ON_ONCE(1);
+ tr->stop_count = 0;
+ }
+ goto out;
+ }
+
+ buffer = tr->trace_buffer.buffer;
+ if (buffer)
+ ring_buffer_record_enable(buffer);
+
+ out:
+ raw_spin_unlock_irqrestore(&tr->start_lock, flags);
}
/**
@@ -1070,25 +1265,48 @@
unsigned long flags;
ftrace_stop();
- raw_spin_lock_irqsave(&tracing_start_lock, flags);
- if (trace_stop_count++)
+ raw_spin_lock_irqsave(&global_trace.start_lock, flags);
+ if (global_trace.stop_count++)
goto out;
/* Prevent the buffers from switching */
arch_spin_lock(&ftrace_max_lock);
- buffer = global_trace.buffer;
+ buffer = global_trace.trace_buffer.buffer;
if (buffer)
ring_buffer_record_disable(buffer);
- buffer = max_tr.buffer;
+#ifdef CONFIG_TRACER_MAX_TRACE
+ buffer = global_trace.max_buffer.buffer;
if (buffer)
ring_buffer_record_disable(buffer);
+#endif
arch_spin_unlock(&ftrace_max_lock);
out:
- raw_spin_unlock_irqrestore(&tracing_start_lock, flags);
+ raw_spin_unlock_irqrestore(&global_trace.start_lock, flags);
+}
+
+static void tracing_stop_tr(struct trace_array *tr)
+{
+ struct ring_buffer *buffer;
+ unsigned long flags;
+
+ /* If global, we need to also stop the max tracer */
+ if (tr->flags & TRACE_ARRAY_FL_GLOBAL)
+ return tracing_stop();
+
+ raw_spin_lock_irqsave(&tr->start_lock, flags);
+ if (tr->stop_count++)
+ goto out;
+
+ buffer = tr->trace_buffer.buffer;
+ if (buffer)
+ ring_buffer_record_disable(buffer);
+
+ out:
+ raw_spin_unlock_irqrestore(&tr->start_lock, flags);
}
void trace_stop_cmdline_recording(void);
@@ -1221,11 +1439,6 @@
__buffer_unlock_commit(struct ring_buffer *buffer, struct ring_buffer_event *event)
{
__this_cpu_write(trace_cmdline_save, true);
- if (trace_wakeup_needed) {
- trace_wakeup_needed = false;
- /* irq_work_queue() supplies it's own memory barriers */
- irq_work_queue(&trace_work_wakeup);
- }
ring_buffer_unlock_commit(buffer, event);
}
@@ -1249,11 +1462,23 @@
EXPORT_SYMBOL_GPL(trace_buffer_unlock_commit);
struct ring_buffer_event *
+trace_event_buffer_lock_reserve(struct ring_buffer **current_rb,
+ struct ftrace_event_file *ftrace_file,
+ int type, unsigned long len,
+ unsigned long flags, int pc)
+{
+ *current_rb = ftrace_file->tr->trace_buffer.buffer;
+ return trace_buffer_lock_reserve(*current_rb,
+ type, len, flags, pc);
+}
+EXPORT_SYMBOL_GPL(trace_event_buffer_lock_reserve);
+
+struct ring_buffer_event *
trace_current_buffer_lock_reserve(struct ring_buffer **current_rb,
int type, unsigned long len,
unsigned long flags, int pc)
{
- *current_rb = global_trace.buffer;
+ *current_rb = global_trace.trace_buffer.buffer;
return trace_buffer_lock_reserve(*current_rb,
type, len, flags, pc);
}
@@ -1292,7 +1517,7 @@
int pc)
{
struct ftrace_event_call *call = &event_function;
- struct ring_buffer *buffer = tr->buffer;
+ struct ring_buffer *buffer = tr->trace_buffer.buffer;
struct ring_buffer_event *event;
struct ftrace_entry *entry;
@@ -1433,13 +1658,14 @@
void __trace_stack(struct trace_array *tr, unsigned long flags, int skip,
int pc)
{
- __ftrace_trace_stack(tr->buffer, flags, skip, pc, NULL);
+ __ftrace_trace_stack(tr->trace_buffer.buffer, flags, skip, pc, NULL);
}
/**
* trace_dump_stack - record a stack back trace in the trace buffer
+ * @skip: Number of functions to skip (helper handlers)
*/
-void trace_dump_stack(void)
+void trace_dump_stack(int skip)
{
unsigned long flags;
@@ -1448,8 +1674,13 @@
local_save_flags(flags);
- /* skipping 3 traces, seems to get us at the caller of this function */
- __ftrace_trace_stack(global_trace.buffer, flags, 3, preempt_count(), NULL);
+ /*
+ * Skip 3 more, seems to get us at the caller of
+ * this function.
+ */
+ skip += 3;
+ __ftrace_trace_stack(global_trace.trace_buffer.buffer,
+ flags, skip, preempt_count(), NULL);
}
static DEFINE_PER_CPU(int, user_stack_count);
@@ -1619,7 +1850,7 @@
* directly here. If the global_trace.buffer is already
* allocated here, then this was called by module code.
*/
- if (global_trace.buffer)
+ if (global_trace.trace_buffer.buffer)
tracing_start_cmdline_record();
}
@@ -1679,7 +1910,7 @@
local_save_flags(flags);
size = sizeof(*entry) + sizeof(u32) * len;
- buffer = tr->buffer;
+ buffer = tr->trace_buffer.buffer;
event = trace_buffer_lock_reserve(buffer, TRACE_BPRINT, size,
flags, pc);
if (!event)
@@ -1702,27 +1933,12 @@
}
EXPORT_SYMBOL_GPL(trace_vbprintk);
-int trace_array_printk(struct trace_array *tr,
- unsigned long ip, const char *fmt, ...)
-{
- int ret;
- va_list ap;
-
- if (!(trace_flags & TRACE_ITER_PRINTK))
- return 0;
-
- va_start(ap, fmt);
- ret = trace_array_vprintk(tr, ip, fmt, ap);
- va_end(ap);
- return ret;
-}
-
-int trace_array_vprintk(struct trace_array *tr,
- unsigned long ip, const char *fmt, va_list args)
+static int
+__trace_array_vprintk(struct ring_buffer *buffer,
+ unsigned long ip, const char *fmt, va_list args)
{
struct ftrace_event_call *call = &event_print;
struct ring_buffer_event *event;
- struct ring_buffer *buffer;
int len = 0, size, pc;
struct print_entry *entry;
unsigned long flags;
@@ -1750,7 +1966,6 @@
local_save_flags(flags);
size = sizeof(*entry) + len + 1;
- buffer = tr->buffer;
event = trace_buffer_lock_reserve(buffer, TRACE_PRINT, size,
flags, pc);
if (!event)
@@ -1771,6 +1986,42 @@
return len;
}
+int trace_array_vprintk(struct trace_array *tr,
+ unsigned long ip, const char *fmt, va_list args)
+{
+ return __trace_array_vprintk(tr->trace_buffer.buffer, ip, fmt, args);
+}
+
+int trace_array_printk(struct trace_array *tr,
+ unsigned long ip, const char *fmt, ...)
+{
+ int ret;
+ va_list ap;
+
+ if (!(trace_flags & TRACE_ITER_PRINTK))
+ return 0;
+
+ va_start(ap, fmt);
+ ret = trace_array_vprintk(tr, ip, fmt, ap);
+ va_end(ap);
+ return ret;
+}
+
+int trace_array_printk_buf(struct ring_buffer *buffer,
+ unsigned long ip, const char *fmt, ...)
+{
+ int ret;
+ va_list ap;
+
+ if (!(trace_flags & TRACE_ITER_PRINTK))
+ return 0;
+
+ va_start(ap, fmt);
+ ret = __trace_array_vprintk(buffer, ip, fmt, ap);
+ va_end(ap);
+ return ret;
+}
+
int trace_vprintk(unsigned long ip, const char *fmt, va_list args)
{
return trace_array_vprintk(&global_trace, ip, fmt, args);
@@ -1796,7 +2047,7 @@
if (buf_iter)
event = ring_buffer_iter_peek(buf_iter, ts);
else
- event = ring_buffer_peek(iter->tr->buffer, cpu, ts,
+ event = ring_buffer_peek(iter->trace_buffer->buffer, cpu, ts,
lost_events);
if (event) {
@@ -1811,7 +2062,7 @@
__find_next_entry(struct trace_iterator *iter, int *ent_cpu,
unsigned long *missing_events, u64 *ent_ts)
{
- struct ring_buffer *buffer = iter->tr->buffer;
+ struct ring_buffer *buffer = iter->trace_buffer->buffer;
struct trace_entry *ent, *next = NULL;
unsigned long lost_events = 0, next_lost = 0;
int cpu_file = iter->cpu_file;
@@ -1824,7 +2075,7 @@
* If we are in a per_cpu trace file, don't bother by iterating over
* all cpu and peek directly.
*/
- if (cpu_file > TRACE_PIPE_ALL_CPU) {
+ if (cpu_file > RING_BUFFER_ALL_CPUS) {
if (ring_buffer_empty_cpu(buffer, cpu_file))
return NULL;
ent = peek_next_entry(iter, cpu_file, ent_ts, missing_events);
@@ -1888,7 +2139,7 @@
static void trace_consume(struct trace_iterator *iter)
{
- ring_buffer_consume(iter->tr->buffer, iter->cpu, &iter->ts,
+ ring_buffer_consume(iter->trace_buffer->buffer, iter->cpu, &iter->ts,
&iter->lost_events);
}
@@ -1921,13 +2172,12 @@
void tracing_iter_reset(struct trace_iterator *iter, int cpu)
{
- struct trace_array *tr = iter->tr;
struct ring_buffer_event *event;
struct ring_buffer_iter *buf_iter;
unsigned long entries = 0;
u64 ts;
- tr->data[cpu]->skipped_entries = 0;
+ per_cpu_ptr(iter->trace_buffer->data, cpu)->skipped_entries = 0;
buf_iter = trace_buffer_iter(iter, cpu);
if (!buf_iter)
@@ -1941,13 +2191,13 @@
* by the timestamp being before the start of the buffer.
*/
while ((event = ring_buffer_iter_peek(buf_iter, &ts))) {
- if (ts >= iter->tr->time_start)
+ if (ts >= iter->trace_buffer->time_start)
break;
entries++;
ring_buffer_read(buf_iter, NULL);
}
- tr->data[cpu]->skipped_entries = entries;
+ per_cpu_ptr(iter->trace_buffer->data, cpu)->skipped_entries = entries;
}
/*
@@ -1957,6 +2207,7 @@
static void *s_start(struct seq_file *m, loff_t *pos)
{
struct trace_iterator *iter = m->private;
+ struct trace_array *tr = iter->tr;
int cpu_file = iter->cpu_file;
void *p = NULL;
loff_t l = 0;
@@ -1969,12 +2220,14 @@
* will point to the same string as current_trace->name.
*/
mutex_lock(&trace_types_lock);
- if (unlikely(current_trace && iter->trace->name != current_trace->name))
- *iter->trace = *current_trace;
+ if (unlikely(tr->current_trace && iter->trace->name != tr->current_trace->name))
+ *iter->trace = *tr->current_trace;
mutex_unlock(&trace_types_lock);
+#ifdef CONFIG_TRACER_MAX_TRACE
if (iter->snapshot && iter->trace->use_max_tr)
return ERR_PTR(-EBUSY);
+#endif
if (!iter->snapshot)
atomic_inc(&trace_record_cmdline_disabled);
@@ -1984,7 +2237,7 @@
iter->cpu = 0;
iter->idx = -1;
- if (cpu_file == TRACE_PIPE_ALL_CPU) {
+ if (cpu_file == RING_BUFFER_ALL_CPUS) {
for_each_tracing_cpu(cpu)
tracing_iter_reset(iter, cpu);
} else
@@ -2016,17 +2269,21 @@
{
struct trace_iterator *iter = m->private;
+#ifdef CONFIG_TRACER_MAX_TRACE
if (iter->snapshot && iter->trace->use_max_tr)
return;
+#endif
if (!iter->snapshot)
atomic_dec(&trace_record_cmdline_disabled);
+
trace_access_unlock(iter->cpu_file);
trace_event_read_unlock();
}
static void
-get_total_entries(struct trace_array *tr, unsigned long *total, unsigned long *entries)
+get_total_entries(struct trace_buffer *buf,
+ unsigned long *total, unsigned long *entries)
{
unsigned long count;
int cpu;
@@ -2035,19 +2292,19 @@
*entries = 0;
for_each_tracing_cpu(cpu) {
- count = ring_buffer_entries_cpu(tr->buffer, cpu);
+ count = ring_buffer_entries_cpu(buf->buffer, cpu);
/*
* If this buffer has skipped entries, then we hold all
* entries for the trace and we need to ignore the
* ones before the time stamp.
*/
- if (tr->data[cpu]->skipped_entries) {
- count -= tr->data[cpu]->skipped_entries;
+ if (per_cpu_ptr(buf->data, cpu)->skipped_entries) {
+ count -= per_cpu_ptr(buf->data, cpu)->skipped_entries;
/* total is the same as the entries */
*total += count;
} else
*total += count +
- ring_buffer_overrun_cpu(tr->buffer, cpu);
+ ring_buffer_overrun_cpu(buf->buffer, cpu);
*entries += count;
}
}
@@ -2064,27 +2321,27 @@
seq_puts(m, "# \\ / ||||| \\ | / \n");
}
-static void print_event_info(struct trace_array *tr, struct seq_file *m)
+static void print_event_info(struct trace_buffer *buf, struct seq_file *m)
{
unsigned long total;
unsigned long entries;
- get_total_entries(tr, &total, &entries);
+ get_total_entries(buf, &total, &entries);
seq_printf(m, "# entries-in-buffer/entries-written: %lu/%lu #P:%d\n",
entries, total, num_online_cpus());
seq_puts(m, "#\n");
}
-static void print_func_help_header(struct trace_array *tr, struct seq_file *m)
+static void print_func_help_header(struct trace_buffer *buf, struct seq_file *m)
{
- print_event_info(tr, m);
+ print_event_info(buf, m);
seq_puts(m, "# TASK-PID CPU# TIMESTAMP FUNCTION\n");
seq_puts(m, "# | | | | |\n");
}
-static void print_func_help_header_irq(struct trace_array *tr, struct seq_file *m)
+static void print_func_help_header_irq(struct trace_buffer *buf, struct seq_file *m)
{
- print_event_info(tr, m);
+ print_event_info(buf, m);
seq_puts(m, "# _-----=> irqs-off\n");
seq_puts(m, "# / _----=> need-resched\n");
seq_puts(m, "# | / _---=> hardirq/softirq\n");
@@ -2098,16 +2355,16 @@
print_trace_header(struct seq_file *m, struct trace_iterator *iter)
{
unsigned long sym_flags = (trace_flags & TRACE_ITER_SYM_MASK);
- struct trace_array *tr = iter->tr;
- struct trace_array_cpu *data = tr->data[tr->cpu];
- struct tracer *type = current_trace;
+ struct trace_buffer *buf = iter->trace_buffer;
+ struct trace_array_cpu *data = per_cpu_ptr(buf->data, buf->cpu);
+ struct tracer *type = iter->trace;
unsigned long entries;
unsigned long total;
const char *name = "preemption";
name = type->name;
- get_total_entries(tr, &total, &entries);
+ get_total_entries(buf, &total, &entries);
seq_printf(m, "# %s latency trace v1.1.5 on %s\n",
name, UTS_RELEASE);
@@ -2118,7 +2375,7 @@
nsecs_to_usecs(data->saved_latency),
entries,
total,
- tr->cpu,
+ buf->cpu,
#if defined(CONFIG_PREEMPT_NONE)
"server",
#elif defined(CONFIG_PREEMPT_VOLUNTARY)
@@ -2169,7 +2426,7 @@
if (cpumask_test_cpu(iter->cpu, iter->started))
return;
- if (iter->tr->data[iter->cpu]->skipped_entries)
+ if (per_cpu_ptr(iter->trace_buffer->data, iter->cpu)->skipped_entries)
return;
cpumask_set_cpu(iter->cpu, iter->started);
@@ -2292,14 +2549,14 @@
int cpu;
/* If we are looking at one CPU buffer, only check that one */
- if (iter->cpu_file != TRACE_PIPE_ALL_CPU) {
+ if (iter->cpu_file != RING_BUFFER_ALL_CPUS) {
cpu = iter->cpu_file;
buf_iter = trace_buffer_iter(iter, cpu);
if (buf_iter) {
if (!ring_buffer_iter_empty(buf_iter))
return 0;
} else {
- if (!ring_buffer_empty_cpu(iter->tr->buffer, cpu))
+ if (!ring_buffer_empty_cpu(iter->trace_buffer->buffer, cpu))
return 0;
}
return 1;
@@ -2311,7 +2568,7 @@
if (!ring_buffer_iter_empty(buf_iter))
return 0;
} else {
- if (!ring_buffer_empty_cpu(iter->tr->buffer, cpu))
+ if (!ring_buffer_empty_cpu(iter->trace_buffer->buffer, cpu))
return 0;
}
}
@@ -2335,6 +2592,11 @@
return ret;
}
+ if (iter->ent->type == TRACE_BPUTS &&
+ trace_flags & TRACE_ITER_PRINTK &&
+ trace_flags & TRACE_ITER_PRINTK_MSGONLY)
+ return trace_print_bputs_msg_only(iter);
+
if (iter->ent->type == TRACE_BPRINT &&
trace_flags & TRACE_ITER_PRINTK &&
trace_flags & TRACE_ITER_PRINTK_MSGONLY)
@@ -2389,9 +2651,9 @@
} else {
if (!(trace_flags & TRACE_ITER_VERBOSE)) {
if (trace_flags & TRACE_ITER_IRQ_INFO)
- print_func_help_header_irq(iter->tr, m);
+ print_func_help_header_irq(iter->trace_buffer, m);
else
- print_func_help_header(iter->tr, m);
+ print_func_help_header(iter->trace_buffer, m);
}
}
}
@@ -2405,14 +2667,8 @@
}
#ifdef CONFIG_TRACER_MAX_TRACE
-static void print_snapshot_help(struct seq_file *m, struct trace_iterator *iter)
+static void show_snapshot_main_help(struct seq_file *m)
{
- if (iter->trace->allocated_snapshot)
- seq_printf(m, "#\n# * Snapshot is allocated *\n#\n");
- else
- seq_printf(m, "#\n# * Snapshot is freed *\n#\n");
-
- seq_printf(m, "# Snapshot commands:\n");
seq_printf(m, "# echo 0 > snapshot : Clears and frees snapshot buffer\n");
seq_printf(m, "# echo 1 > snapshot : Allocates snapshot buffer, if not already allocated.\n");
seq_printf(m, "# Takes a snapshot of the main buffer.\n");
@@ -2420,6 +2676,35 @@
seq_printf(m, "# (Doesn't have to be '2' works with any number that\n");
seq_printf(m, "# is not a '0' or '1')\n");
}
+
+static void show_snapshot_percpu_help(struct seq_file *m)
+{
+ seq_printf(m, "# echo 0 > snapshot : Invalid for per_cpu snapshot file.\n");
+#ifdef CONFIG_RING_BUFFER_ALLOW_SWAP
+ seq_printf(m, "# echo 1 > snapshot : Allocates snapshot buffer, if not already allocated.\n");
+ seq_printf(m, "# Takes a snapshot of the main buffer for this cpu.\n");
+#else
+ seq_printf(m, "# echo 1 > snapshot : Not supported with this kernel.\n");
+ seq_printf(m, "# Must use main snapshot file to allocate.\n");
+#endif
+ seq_printf(m, "# echo 2 > snapshot : Clears this cpu's snapshot buffer (but does not allocate)\n");
+ seq_printf(m, "# (Doesn't have to be '2' works with any number that\n");
+ seq_printf(m, "# is not a '0' or '1')\n");
+}
+
+static void print_snapshot_help(struct seq_file *m, struct trace_iterator *iter)
+{
+ if (iter->tr->allocated_snapshot)
+ seq_printf(m, "#\n# * Snapshot is allocated *\n#\n");
+ else
+ seq_printf(m, "#\n# * Snapshot is freed *\n#\n");
+
+ seq_printf(m, "# Snapshot commands:\n");
+ if (iter->cpu_file == RING_BUFFER_ALL_CPUS)
+ show_snapshot_main_help(m);
+ else
+ show_snapshot_percpu_help(m);
+}
#else
/* Should never be called */
static inline void print_snapshot_help(struct seq_file *m, struct trace_iterator *iter) { }
@@ -2479,7 +2764,8 @@
static struct trace_iterator *
__tracing_open(struct inode *inode, struct file *file, bool snapshot)
{
- long cpu_file = (long) inode->i_private;
+ struct trace_cpu *tc = inode->i_private;
+ struct trace_array *tr = tc->tr;
struct trace_iterator *iter;
int cpu;
@@ -2504,26 +2790,31 @@
if (!iter->trace)
goto fail;
- *iter->trace = *current_trace;
+ *iter->trace = *tr->current_trace;
if (!zalloc_cpumask_var(&iter->started, GFP_KERNEL))
goto fail;
- if (current_trace->print_max || snapshot)
- iter->tr = &max_tr;
+ iter->tr = tr;
+
+#ifdef CONFIG_TRACER_MAX_TRACE
+ /* Currently only the top directory has a snapshot */
+ if (tr->current_trace->print_max || snapshot)
+ iter->trace_buffer = &tr->max_buffer;
else
- iter->tr = &global_trace;
+#endif
+ iter->trace_buffer = &tr->trace_buffer;
iter->snapshot = snapshot;
iter->pos = -1;
mutex_init(&iter->mutex);
- iter->cpu_file = cpu_file;
+ iter->cpu_file = tc->cpu;
/* Notify the tracer early; before we stop tracing. */
if (iter->trace && iter->trace->open)
iter->trace->open(iter);
/* Annotate start of buffers if we had overruns */
- if (ring_buffer_overruns(iter->tr->buffer))
+ if (ring_buffer_overruns(iter->trace_buffer->buffer))
iter->iter_flags |= TRACE_FILE_ANNOTATE;
/* Output in nanoseconds only if we are using a clock in nanoseconds. */
@@ -2532,12 +2823,12 @@
/* stop the trace while dumping if we are not opening "snapshot" */
if (!iter->snapshot)
- tracing_stop();
+ tracing_stop_tr(tr);
- if (iter->cpu_file == TRACE_PIPE_ALL_CPU) {
+ if (iter->cpu_file == RING_BUFFER_ALL_CPUS) {
for_each_tracing_cpu(cpu) {
iter->buffer_iter[cpu] =
- ring_buffer_read_prepare(iter->tr->buffer, cpu);
+ ring_buffer_read_prepare(iter->trace_buffer->buffer, cpu);
}
ring_buffer_read_prepare_sync();
for_each_tracing_cpu(cpu) {
@@ -2547,12 +2838,14 @@
} else {
cpu = iter->cpu_file;
iter->buffer_iter[cpu] =
- ring_buffer_read_prepare(iter->tr->buffer, cpu);
+ ring_buffer_read_prepare(iter->trace_buffer->buffer, cpu);
ring_buffer_read_prepare_sync();
ring_buffer_read_start(iter->buffer_iter[cpu]);
tracing_iter_reset(iter, cpu);
}
+ tr->ref++;
+
mutex_unlock(&trace_types_lock);
return iter;
@@ -2579,14 +2872,20 @@
{
struct seq_file *m = file->private_data;
struct trace_iterator *iter;
+ struct trace_array *tr;
int cpu;
if (!(file->f_mode & FMODE_READ))
return 0;
iter = m->private;
+ tr = iter->tr;
mutex_lock(&trace_types_lock);
+
+ WARN_ON(!tr->ref);
+ tr->ref--;
+
for_each_tracing_cpu(cpu) {
if (iter->buffer_iter[cpu])
ring_buffer_read_finish(iter->buffer_iter[cpu]);
@@ -2597,7 +2896,7 @@
if (!iter->snapshot)
/* reenable tracing if it was previously enabled */
- tracing_start();
+ tracing_start_tr(tr);
mutex_unlock(&trace_types_lock);
mutex_destroy(&iter->mutex);
@@ -2616,12 +2915,13 @@
/* If this file was open for write, then erase contents */
if ((file->f_mode & FMODE_WRITE) &&
(file->f_flags & O_TRUNC)) {
- long cpu = (long) inode->i_private;
+ struct trace_cpu *tc = inode->i_private;
+ struct trace_array *tr = tc->tr;
- if (cpu == TRACE_PIPE_ALL_CPU)
- tracing_reset_online_cpus(&global_trace);
+ if (tc->cpu == RING_BUFFER_ALL_CPUS)
+ tracing_reset_online_cpus(&tr->trace_buffer);
else
- tracing_reset(&global_trace, cpu);
+ tracing_reset(&tr->trace_buffer, tc->cpu);
}
if (file->f_mode & FMODE_READ) {
@@ -2768,8 +3068,9 @@
tracing_cpumask_write(struct file *filp, const char __user *ubuf,
size_t count, loff_t *ppos)
{
- int err, cpu;
+ struct trace_array *tr = filp->private_data;
cpumask_var_t tracing_cpumask_new;
+ int err, cpu;
if (!alloc_cpumask_var(&tracing_cpumask_new, GFP_KERNEL))
return -ENOMEM;
@@ -2789,13 +3090,13 @@
*/
if (cpumask_test_cpu(cpu, tracing_cpumask) &&
!cpumask_test_cpu(cpu, tracing_cpumask_new)) {
- atomic_inc(&global_trace.data[cpu]->disabled);
- ring_buffer_record_disable_cpu(global_trace.buffer, cpu);
+ atomic_inc(&per_cpu_ptr(tr->trace_buffer.data, cpu)->disabled);
+ ring_buffer_record_disable_cpu(tr->trace_buffer.buffer, cpu);
}
if (!cpumask_test_cpu(cpu, tracing_cpumask) &&
cpumask_test_cpu(cpu, tracing_cpumask_new)) {
- atomic_dec(&global_trace.data[cpu]->disabled);
- ring_buffer_record_enable_cpu(global_trace.buffer, cpu);
+ atomic_dec(&per_cpu_ptr(tr->trace_buffer.data, cpu)->disabled);
+ ring_buffer_record_enable_cpu(tr->trace_buffer.buffer, cpu);
}
}
arch_spin_unlock(&ftrace_max_lock);
@@ -2824,12 +3125,13 @@
static int tracing_trace_options_show(struct seq_file *m, void *v)
{
struct tracer_opt *trace_opts;
+ struct trace_array *tr = m->private;
u32 tracer_flags;
int i;
mutex_lock(&trace_types_lock);
- tracer_flags = current_trace->flags->val;
- trace_opts = current_trace->flags->opts;
+ tracer_flags = tr->current_trace->flags->val;
+ trace_opts = tr->current_trace->flags->opts;
for (i = 0; trace_options[i]; i++) {
if (trace_flags & (1 << i))
@@ -2893,15 +3195,15 @@
return 0;
}
-int set_tracer_flag(unsigned int mask, int enabled)
+int set_tracer_flag(struct trace_array *tr, unsigned int mask, int enabled)
{
/* do nothing if flag is already set */
if (!!(trace_flags & mask) == !!enabled)
return 0;
/* Give the tracer a chance to approve the change */
- if (current_trace->flag_changed)
- if (current_trace->flag_changed(current_trace, mask, !!enabled))
+ if (tr->current_trace->flag_changed)
+ if (tr->current_trace->flag_changed(tr->current_trace, mask, !!enabled))
return -EINVAL;
if (enabled)
@@ -2913,9 +3215,9 @@
trace_event_enable_cmd_record(enabled);
if (mask == TRACE_ITER_OVERWRITE) {
- ring_buffer_change_overwrite(global_trace.buffer, enabled);
+ ring_buffer_change_overwrite(tr->trace_buffer.buffer, enabled);
#ifdef CONFIG_TRACER_MAX_TRACE
- ring_buffer_change_overwrite(max_tr.buffer, enabled);
+ ring_buffer_change_overwrite(tr->max_buffer.buffer, enabled);
#endif
}
@@ -2925,7 +3227,7 @@
return 0;
}
-static int trace_set_options(char *option)
+static int trace_set_options(struct trace_array *tr, char *option)
{
char *cmp;
int neg = 0;
@@ -2943,14 +3245,14 @@
for (i = 0; trace_options[i]; i++) {
if (strcmp(cmp, trace_options[i]) == 0) {
- ret = set_tracer_flag(1 << i, !neg);
+ ret = set_tracer_flag(tr, 1 << i, !neg);
break;
}
}
/* If no option could be set, test the specific tracer options */
if (!trace_options[i])
- ret = set_tracer_option(current_trace, cmp, neg);
+ ret = set_tracer_option(tr->current_trace, cmp, neg);
mutex_unlock(&trace_types_lock);
@@ -2961,6 +3263,8 @@
tracing_trace_options_write(struct file *filp, const char __user *ubuf,
size_t cnt, loff_t *ppos)
{
+ struct seq_file *m = filp->private_data;
+ struct trace_array *tr = m->private;
char buf[64];
int ret;
@@ -2972,7 +3276,7 @@
buf[cnt] = 0;
- ret = trace_set_options(buf);
+ ret = trace_set_options(tr, buf);
if (ret < 0)
return ret;
@@ -2985,7 +3289,8 @@
{
if (tracing_disabled)
return -ENODEV;
- return single_open(file, tracing_trace_options_show, NULL);
+
+ return single_open(file, tracing_trace_options_show, inode->i_private);
}
static const struct file_operations tracing_iter_fops = {
@@ -2998,20 +3303,84 @@
static const char readme_msg[] =
"tracing mini-HOWTO:\n\n"
- "# mount -t debugfs nodev /sys/kernel/debug\n\n"
- "# cat /sys/kernel/debug/tracing/available_tracers\n"
- "wakeup wakeup_rt preemptirqsoff preemptoff irqsoff function nop\n\n"
- "# cat /sys/kernel/debug/tracing/current_tracer\n"
- "nop\n"
- "# echo wakeup > /sys/kernel/debug/tracing/current_tracer\n"
- "# cat /sys/kernel/debug/tracing/current_tracer\n"
- "wakeup\n"
- "# cat /sys/kernel/debug/tracing/trace_options\n"
- "noprint-parent nosym-offset nosym-addr noverbose\n"
- "# echo print-parent > /sys/kernel/debug/tracing/trace_options\n"
- "# echo 1 > /sys/kernel/debug/tracing/tracing_on\n"
- "# cat /sys/kernel/debug/tracing/trace > /tmp/trace.txt\n"
- "# echo 0 > /sys/kernel/debug/tracing/tracing_on\n"
+ "# echo 0 > tracing_on : quick way to disable tracing\n"
+ "# echo 1 > tracing_on : quick way to re-enable tracing\n\n"
+ " Important files:\n"
+ " trace\t\t\t- The static contents of the buffer\n"
+ "\t\t\t To clear the buffer write into this file: echo > trace\n"
+ " trace_pipe\t\t- A consuming read to see the contents of the buffer\n"
+ " current_tracer\t- function and latency tracers\n"
+ " available_tracers\t- list of configured tracers for current_tracer\n"
+ " buffer_size_kb\t- view and modify size of per cpu buffer\n"
+ " buffer_total_size_kb - view total size of all cpu buffers\n\n"
+ " trace_clock\t\t-change the clock used to order events\n"
+ " local: Per cpu clock but may not be synced across CPUs\n"
+ " global: Synced across CPUs but slows tracing down.\n"
+ " counter: Not a clock, but just an increment\n"
+ " uptime: Jiffy counter from time of boot\n"
+ " perf: Same clock that perf events use\n"
+#ifdef CONFIG_X86_64
+ " x86-tsc: TSC cycle counter\n"
+#endif
+ "\n trace_marker\t\t- Writes into this file writes into the kernel buffer\n"
+ " tracing_cpumask\t- Limit which CPUs to trace\n"
+ " instances\t\t- Make sub-buffers with: mkdir instances/foo\n"
+ "\t\t\t Remove sub-buffer with rmdir\n"
+ " trace_options\t\t- Set format or modify how tracing happens\n"
+ "\t\t\t Disable an option by adding a suffix 'no' to the option name\n"
+#ifdef CONFIG_DYNAMIC_FTRACE
+ "\n available_filter_functions - list of functions that can be filtered on\n"
+ " set_ftrace_filter\t- echo function name in here to only trace these functions\n"
+ " accepts: func_full_name, *func_end, func_begin*, *func_middle*\n"
+ " modules: Can select a group via module\n"
+ " Format: :mod:<module-name>\n"
+ " example: echo :mod:ext3 > set_ftrace_filter\n"
+ " triggers: a command to perform when function is hit\n"
+ " Format: <function>:<trigger>[:count]\n"
+ " trigger: traceon, traceoff\n"
+ " enable_event:<system>:<event>\n"
+ " disable_event:<system>:<event>\n"
+#ifdef CONFIG_STACKTRACE
+ " stacktrace\n"
+#endif
+#ifdef CONFIG_TRACER_SNAPSHOT
+ " snapshot\n"
+#endif
+ " example: echo do_fault:traceoff > set_ftrace_filter\n"
+ " echo do_trap:traceoff:3 > set_ftrace_filter\n"
+ " The first one will disable tracing every time do_fault is hit\n"
+ " The second will disable tracing at most 3 times when do_trap is hit\n"
+ " The first time do trap is hit and it disables tracing, the counter\n"
+ " will decrement to 2. If tracing is already disabled, the counter\n"
+ " will not decrement. It only decrements when the trigger did work\n"
+ " To remove trigger without count:\n"
+ " echo '!<function>:<trigger> > set_ftrace_filter\n"
+ " To remove trigger with a count:\n"
+ " echo '!<function>:<trigger>:0 > set_ftrace_filter\n"
+ " set_ftrace_notrace\t- echo function name in here to never trace.\n"
+ " accepts: func_full_name, *func_end, func_begin*, *func_middle*\n"
+ " modules: Can select a group via module command :mod:\n"
+ " Does not accept triggers\n"
+#endif /* CONFIG_DYNAMIC_FTRACE */
+#ifdef CONFIG_FUNCTION_TRACER
+ " set_ftrace_pid\t- Write pid(s) to only function trace those pids (function)\n"
+#endif
+#ifdef CONFIG_FUNCTION_GRAPH_TRACER
+ " set_graph_function\t- Trace the nested calls of a function (function_graph)\n"
+ " max_graph_depth\t- Trace a limited depth of nested calls (0 is unlimited)\n"
+#endif
+#ifdef CONFIG_TRACER_SNAPSHOT
+ "\n snapshot\t\t- Like 'trace' but shows the content of the static snapshot buffer\n"
+ "\t\t\t Read the contents for more information\n"
+#endif
+#ifdef CONFIG_STACKTRACE
+ " stack_trace\t\t- Shows the max stack trace when active\n"
+ " stack_max_size\t- Shows current max stack size that was traced\n"
+ "\t\t\t Write into this file to reset the max size (trigger a new trace)\n"
+#ifdef CONFIG_DYNAMIC_FTRACE
+ " stack_trace_filter\t- Like set_ftrace_filter but limits what stack_trace traces\n"
+#endif
+#endif /* CONFIG_STACKTRACE */
;
static ssize_t
@@ -3083,11 +3452,12 @@
tracing_set_trace_read(struct file *filp, char __user *ubuf,
size_t cnt, loff_t *ppos)
{
+ struct trace_array *tr = filp->private_data;
char buf[MAX_TRACER_SIZE+2];
int r;
mutex_lock(&trace_types_lock);
- r = sprintf(buf, "%s\n", current_trace->name);
+ r = sprintf(buf, "%s\n", tr->current_trace->name);
mutex_unlock(&trace_types_lock);
return simple_read_from_buffer(ubuf, cnt, ppos, buf, r);
@@ -3095,43 +3465,48 @@
int tracer_init(struct tracer *t, struct trace_array *tr)
{
- tracing_reset_online_cpus(tr);
+ tracing_reset_online_cpus(&tr->trace_buffer);
return t->init(tr);
}
-static void set_buffer_entries(struct trace_array *tr, unsigned long val)
+static void set_buffer_entries(struct trace_buffer *buf, unsigned long val)
{
int cpu;
+
for_each_tracing_cpu(cpu)
- tr->data[cpu]->entries = val;
+ per_cpu_ptr(buf->data, cpu)->entries = val;
}
+#ifdef CONFIG_TRACER_MAX_TRACE
/* resize @tr's buffer to the size of @size_tr's entries */
-static int resize_buffer_duplicate_size(struct trace_array *tr,
- struct trace_array *size_tr, int cpu_id)
+static int resize_buffer_duplicate_size(struct trace_buffer *trace_buf,
+ struct trace_buffer *size_buf, int cpu_id)
{
int cpu, ret = 0;
if (cpu_id == RING_BUFFER_ALL_CPUS) {
for_each_tracing_cpu(cpu) {
- ret = ring_buffer_resize(tr->buffer,
- size_tr->data[cpu]->entries, cpu);
+ ret = ring_buffer_resize(trace_buf->buffer,
+ per_cpu_ptr(size_buf->data, cpu)->entries, cpu);
if (ret < 0)
break;
- tr->data[cpu]->entries = size_tr->data[cpu]->entries;
+ per_cpu_ptr(trace_buf->data, cpu)->entries =
+ per_cpu_ptr(size_buf->data, cpu)->entries;
}
} else {
- ret = ring_buffer_resize(tr->buffer,
- size_tr->data[cpu_id]->entries, cpu_id);
+ ret = ring_buffer_resize(trace_buf->buffer,
+ per_cpu_ptr(size_buf->data, cpu_id)->entries, cpu_id);
if (ret == 0)
- tr->data[cpu_id]->entries =
- size_tr->data[cpu_id]->entries;
+ per_cpu_ptr(trace_buf->data, cpu_id)->entries =
+ per_cpu_ptr(size_buf->data, cpu_id)->entries;
}
return ret;
}
+#endif /* CONFIG_TRACER_MAX_TRACE */
-static int __tracing_resize_ring_buffer(unsigned long size, int cpu)
+static int __tracing_resize_ring_buffer(struct trace_array *tr,
+ unsigned long size, int cpu)
{
int ret;
@@ -3140,23 +3515,25 @@
* we use the size that was given, and we can forget about
* expanding it later.
*/
- ring_buffer_expanded = 1;
+ ring_buffer_expanded = true;
/* May be called before buffers are initialized */
- if (!global_trace.buffer)
+ if (!tr->trace_buffer.buffer)
return 0;
- ret = ring_buffer_resize(global_trace.buffer, size, cpu);
+ ret = ring_buffer_resize(tr->trace_buffer.buffer, size, cpu);
if (ret < 0)
return ret;
- if (!current_trace->use_max_tr)
+#ifdef CONFIG_TRACER_MAX_TRACE
+ if (!(tr->flags & TRACE_ARRAY_FL_GLOBAL) ||
+ !tr->current_trace->use_max_tr)
goto out;
- ret = ring_buffer_resize(max_tr.buffer, size, cpu);
+ ret = ring_buffer_resize(tr->max_buffer.buffer, size, cpu);
if (ret < 0) {
- int r = resize_buffer_duplicate_size(&global_trace,
- &global_trace, cpu);
+ int r = resize_buffer_duplicate_size(&tr->trace_buffer,
+ &tr->trace_buffer, cpu);
if (r < 0) {
/*
* AARGH! We are left with different
@@ -3179,20 +3556,23 @@
}
if (cpu == RING_BUFFER_ALL_CPUS)
- set_buffer_entries(&max_tr, size);
+ set_buffer_entries(&tr->max_buffer, size);
else
- max_tr.data[cpu]->entries = size;
+ per_cpu_ptr(tr->max_buffer.data, cpu)->entries = size;
out:
+#endif /* CONFIG_TRACER_MAX_TRACE */
+
if (cpu == RING_BUFFER_ALL_CPUS)
- set_buffer_entries(&global_trace, size);
+ set_buffer_entries(&tr->trace_buffer, size);
else
- global_trace.data[cpu]->entries = size;
+ per_cpu_ptr(tr->trace_buffer.data, cpu)->entries = size;
return ret;
}
-static ssize_t tracing_resize_ring_buffer(unsigned long size, int cpu_id)
+static ssize_t tracing_resize_ring_buffer(struct trace_array *tr,
+ unsigned long size, int cpu_id)
{
int ret = size;
@@ -3206,7 +3586,7 @@
}
}
- ret = __tracing_resize_ring_buffer(size, cpu_id);
+ ret = __tracing_resize_ring_buffer(tr, size, cpu_id);
if (ret < 0)
ret = -ENOMEM;
@@ -3233,7 +3613,7 @@
mutex_lock(&trace_types_lock);
if (!ring_buffer_expanded)
- ret = __tracing_resize_ring_buffer(trace_buf_size,
+ ret = __tracing_resize_ring_buffer(&global_trace, trace_buf_size,
RING_BUFFER_ALL_CPUS);
mutex_unlock(&trace_types_lock);
@@ -3243,7 +3623,7 @@
struct trace_option_dentry;
static struct trace_option_dentry *
-create_trace_option_files(struct tracer *tracer);
+create_trace_option_files(struct trace_array *tr, struct tracer *tracer);
static void
destroy_trace_option_files(struct trace_option_dentry *topts);
@@ -3253,13 +3633,15 @@
static struct trace_option_dentry *topts;
struct trace_array *tr = &global_trace;
struct tracer *t;
+#ifdef CONFIG_TRACER_MAX_TRACE
bool had_max_tr;
+#endif
int ret = 0;
mutex_lock(&trace_types_lock);
if (!ring_buffer_expanded) {
- ret = __tracing_resize_ring_buffer(trace_buf_size,
+ ret = __tracing_resize_ring_buffer(tr, trace_buf_size,
RING_BUFFER_ALL_CPUS);
if (ret < 0)
goto out;
@@ -3274,18 +3656,21 @@
ret = -EINVAL;
goto out;
}
- if (t == current_trace)
+ if (t == tr->current_trace)
goto out;
trace_branch_disable();
- current_trace->enabled = false;
+ tr->current_trace->enabled = false;
- if (current_trace->reset)
- current_trace->reset(tr);
+ if (tr->current_trace->reset)
+ tr->current_trace->reset(tr);
- had_max_tr = current_trace->allocated_snapshot;
- current_trace = &nop_trace;
+ /* Current trace needs to be nop_trace before synchronize_sched */
+ tr->current_trace = &nop_trace;
+
+#ifdef CONFIG_TRACER_MAX_TRACE
+ had_max_tr = tr->allocated_snapshot;
if (had_max_tr && !t->use_max_tr) {
/*
@@ -3296,27 +3681,20 @@
* so a synchronized_sched() is sufficient.
*/
synchronize_sched();
- /*
- * We don't free the ring buffer. instead, resize it because
- * The max_tr ring buffer has some state (e.g. ring->clock) and
- * we want preserve it.
- */
- ring_buffer_resize(max_tr.buffer, 1, RING_BUFFER_ALL_CPUS);
- set_buffer_entries(&max_tr, 1);
- tracing_reset_online_cpus(&max_tr);
- current_trace->allocated_snapshot = false;
+ free_snapshot(tr);
}
+#endif
destroy_trace_option_files(topts);
- topts = create_trace_option_files(t);
+ topts = create_trace_option_files(tr, t);
+
+#ifdef CONFIG_TRACER_MAX_TRACE
if (t->use_max_tr && !had_max_tr) {
- /* we need to make per cpu buffer sizes equivalent */
- ret = resize_buffer_duplicate_size(&max_tr, &global_trace,
- RING_BUFFER_ALL_CPUS);
+ ret = alloc_snapshot(tr);
if (ret < 0)
goto out;
- t->allocated_snapshot = true;
}
+#endif
if (t->init) {
ret = tracer_init(t, tr);
@@ -3324,8 +3702,8 @@
goto out;
}
- current_trace = t;
- current_trace->enabled = true;
+ tr->current_trace = t;
+ tr->current_trace->enabled = true;
trace_branch_enable(tr);
out:
mutex_unlock(&trace_types_lock);
@@ -3399,7 +3777,8 @@
static int tracing_open_pipe(struct inode *inode, struct file *filp)
{
- long cpu_file = (long) inode->i_private;
+ struct trace_cpu *tc = inode->i_private;
+ struct trace_array *tr = tc->tr;
struct trace_iterator *iter;
int ret = 0;
@@ -3424,7 +3803,7 @@
ret = -ENOMEM;
goto fail;
}
- *iter->trace = *current_trace;
+ *iter->trace = *tr->current_trace;
if (!alloc_cpumask_var(&iter->started, GFP_KERNEL)) {
ret = -ENOMEM;
@@ -3441,8 +3820,9 @@
if (trace_clocks[trace_clock_id].in_ns)
iter->iter_flags |= TRACE_FILE_TIME_IN_NS;
- iter->cpu_file = cpu_file;
- iter->tr = &global_trace;
+ iter->cpu_file = tc->cpu;
+ iter->tr = tc->tr;
+ iter->trace_buffer = &tc->tr->trace_buffer;
mutex_init(&iter->mutex);
filp->private_data = iter;
@@ -3481,24 +3861,28 @@
}
static unsigned int
-tracing_poll_pipe(struct file *filp, poll_table *poll_table)
+trace_poll(struct trace_iterator *iter, struct file *filp, poll_table *poll_table)
{
- struct trace_iterator *iter = filp->private_data;
+ /* Iterators are static, they should be filled or empty */
+ if (trace_buffer_iter(iter, iter->cpu_file))
+ return POLLIN | POLLRDNORM;
- if (trace_flags & TRACE_ITER_BLOCK) {
+ if (trace_flags & TRACE_ITER_BLOCK)
/*
* Always select as readable when in blocking mode
*/
return POLLIN | POLLRDNORM;
- } else {
- if (!trace_empty(iter))
- return POLLIN | POLLRDNORM;
- poll_wait(filp, &trace_wait, poll_table);
- if (!trace_empty(iter))
- return POLLIN | POLLRDNORM;
+ else
+ return ring_buffer_poll_wait(iter->trace_buffer->buffer, iter->cpu_file,
+ filp, poll_table);
+}
- return 0;
- }
+static unsigned int
+tracing_poll_pipe(struct file *filp, poll_table *poll_table)
+{
+ struct trace_iterator *iter = filp->private_data;
+
+ return trace_poll(iter, filp, poll_table);
}
/*
@@ -3564,6 +3948,7 @@
size_t cnt, loff_t *ppos)
{
struct trace_iterator *iter = filp->private_data;
+ struct trace_array *tr = iter->tr;
ssize_t sret;
/* return any leftover data */
@@ -3575,8 +3960,8 @@
/* copy the tracer to avoid using a global lock all around */
mutex_lock(&trace_types_lock);
- if (unlikely(iter->trace->name != current_trace->name))
- *iter->trace = *current_trace;
+ if (unlikely(iter->trace->name != tr->current_trace->name))
+ *iter->trace = *tr->current_trace;
mutex_unlock(&trace_types_lock);
/*
@@ -3732,6 +4117,7 @@
.ops = &tracing_pipe_buf_ops,
.spd_release = tracing_spd_release_pipe,
};
+ struct trace_array *tr = iter->tr;
ssize_t ret;
size_t rem;
unsigned int i;
@@ -3741,8 +4127,8 @@
/* copy the tracer to avoid using a global lock all around */
mutex_lock(&trace_types_lock);
- if (unlikely(iter->trace->name != current_trace->name))
- *iter->trace = *current_trace;
+ if (unlikely(iter->trace->name != tr->current_trace->name))
+ *iter->trace = *tr->current_trace;
mutex_unlock(&trace_types_lock);
mutex_lock(&iter->mutex);
@@ -3804,43 +4190,19 @@
goto out;
}
-struct ftrace_entries_info {
- struct trace_array *tr;
- int cpu;
-};
-
-static int tracing_entries_open(struct inode *inode, struct file *filp)
-{
- struct ftrace_entries_info *info;
-
- if (tracing_disabled)
- return -ENODEV;
-
- info = kzalloc(sizeof(*info), GFP_KERNEL);
- if (!info)
- return -ENOMEM;
-
- info->tr = &global_trace;
- info->cpu = (unsigned long)inode->i_private;
-
- filp->private_data = info;
-
- return 0;
-}
-
static ssize_t
tracing_entries_read(struct file *filp, char __user *ubuf,
size_t cnt, loff_t *ppos)
{
- struct ftrace_entries_info *info = filp->private_data;
- struct trace_array *tr = info->tr;
+ struct trace_cpu *tc = filp->private_data;
+ struct trace_array *tr = tc->tr;
char buf[64];
int r = 0;
ssize_t ret;
mutex_lock(&trace_types_lock);
- if (info->cpu == RING_BUFFER_ALL_CPUS) {
+ if (tc->cpu == RING_BUFFER_ALL_CPUS) {
int cpu, buf_size_same;
unsigned long size;
@@ -3850,8 +4212,8 @@
for_each_tracing_cpu(cpu) {
/* fill in the size from first enabled cpu */
if (size == 0)
- size = tr->data[cpu]->entries;
- if (size != tr->data[cpu]->entries) {
+ size = per_cpu_ptr(tr->trace_buffer.data, cpu)->entries;
+ if (size != per_cpu_ptr(tr->trace_buffer.data, cpu)->entries) {
buf_size_same = 0;
break;
}
@@ -3867,7 +4229,7 @@
} else
r = sprintf(buf, "X\n");
} else
- r = sprintf(buf, "%lu\n", tr->data[info->cpu]->entries >> 10);
+ r = sprintf(buf, "%lu\n", per_cpu_ptr(tr->trace_buffer.data, tc->cpu)->entries >> 10);
mutex_unlock(&trace_types_lock);
@@ -3879,7 +4241,7 @@
tracing_entries_write(struct file *filp, const char __user *ubuf,
size_t cnt, loff_t *ppos)
{
- struct ftrace_entries_info *info = filp->private_data;
+ struct trace_cpu *tc = filp->private_data;
unsigned long val;
int ret;
@@ -3894,7 +4256,7 @@
/* value is in KB */
val <<= 10;
- ret = tracing_resize_ring_buffer(val, info->cpu);
+ ret = tracing_resize_ring_buffer(tc->tr, val, tc->cpu);
if (ret < 0)
return ret;
@@ -3903,16 +4265,6 @@
return cnt;
}
-static int
-tracing_entries_release(struct inode *inode, struct file *filp)
-{
- struct ftrace_entries_info *info = filp->private_data;
-
- kfree(info);
-
- return 0;
-}
-
static ssize_t
tracing_total_entries_read(struct file *filp, char __user *ubuf,
size_t cnt, loff_t *ppos)
@@ -3924,7 +4276,7 @@
mutex_lock(&trace_types_lock);
for_each_tracing_cpu(cpu) {
- size += tr->data[cpu]->entries >> 10;
+ size += per_cpu_ptr(tr->trace_buffer.data, cpu)->entries >> 10;
if (!ring_buffer_expanded)
expanded_size += trace_buf_size >> 10;
}
@@ -3954,11 +4306,13 @@
static int
tracing_free_buffer_release(struct inode *inode, struct file *filp)
{
+ struct trace_array *tr = inode->i_private;
+
/* disable tracing ? */
if (trace_flags & TRACE_ITER_STOP_ON_FREE)
tracing_off();
/* resize the ring buffer to 0 */
- tracing_resize_ring_buffer(0, RING_BUFFER_ALL_CPUS);
+ tracing_resize_ring_buffer(tr, 0, RING_BUFFER_ALL_CPUS);
return 0;
}
@@ -4027,7 +4381,7 @@
local_save_flags(irq_flags);
size = sizeof(*entry) + cnt + 2; /* possible \n added */
- buffer = global_trace.buffer;
+ buffer = global_trace.trace_buffer.buffer;
event = trace_buffer_lock_reserve(buffer, TRACE_PRINT, size,
irq_flags, preempt_count());
if (!event) {
@@ -4069,13 +4423,14 @@
static int tracing_clock_show(struct seq_file *m, void *v)
{
+ struct trace_array *tr = m->private;
int i;
for (i = 0; i < ARRAY_SIZE(trace_clocks); i++)
seq_printf(m,
"%s%s%s%s", i ? " " : "",
- i == trace_clock_id ? "[" : "", trace_clocks[i].name,
- i == trace_clock_id ? "]" : "");
+ i == tr->clock_id ? "[" : "", trace_clocks[i].name,
+ i == tr->clock_id ? "]" : "");
seq_putc(m, '\n');
return 0;
@@ -4084,6 +4439,8 @@
static ssize_t tracing_clock_write(struct file *filp, const char __user *ubuf,
size_t cnt, loff_t *fpos)
{
+ struct seq_file *m = filp->private_data;
+ struct trace_array *tr = m->private;
char buf[64];
const char *clockstr;
int i;
@@ -4105,20 +4462,23 @@
if (i == ARRAY_SIZE(trace_clocks))
return -EINVAL;
- trace_clock_id = i;
-
mutex_lock(&trace_types_lock);
- ring_buffer_set_clock(global_trace.buffer, trace_clocks[i].func);
- if (max_tr.buffer)
- ring_buffer_set_clock(max_tr.buffer, trace_clocks[i].func);
+ tr->clock_id = i;
+
+ ring_buffer_set_clock(tr->trace_buffer.buffer, trace_clocks[i].func);
/*
* New clock may not be consistent with the previous clock.
* Reset the buffer so that it doesn't have incomparable timestamps.
*/
- tracing_reset_online_cpus(&global_trace);
- tracing_reset_online_cpus(&max_tr);
+ tracing_reset_online_cpus(&global_trace.trace_buffer);
+
+#ifdef CONFIG_TRACER_MAX_TRACE
+ if (tr->flags & TRACE_ARRAY_FL_GLOBAL && tr->max_buffer.buffer)
+ ring_buffer_set_clock(tr->max_buffer.buffer, trace_clocks[i].func);
+ tracing_reset_online_cpus(&global_trace.max_buffer);
+#endif
mutex_unlock(&trace_types_lock);
@@ -4131,20 +4491,45 @@
{
if (tracing_disabled)
return -ENODEV;
- return single_open(file, tracing_clock_show, NULL);
+
+ return single_open(file, tracing_clock_show, inode->i_private);
}
+struct ftrace_buffer_info {
+ struct trace_iterator iter;
+ void *spare;
+ unsigned int read;
+};
+
#ifdef CONFIG_TRACER_SNAPSHOT
static int tracing_snapshot_open(struct inode *inode, struct file *file)
{
+ struct trace_cpu *tc = inode->i_private;
struct trace_iterator *iter;
+ struct seq_file *m;
int ret = 0;
if (file->f_mode & FMODE_READ) {
iter = __tracing_open(inode, file, true);
if (IS_ERR(iter))
ret = PTR_ERR(iter);
+ } else {
+ /* Writes still need the seq_file to hold the private data */
+ m = kzalloc(sizeof(*m), GFP_KERNEL);
+ if (!m)
+ return -ENOMEM;
+ iter = kzalloc(sizeof(*iter), GFP_KERNEL);
+ if (!iter) {
+ kfree(m);
+ return -ENOMEM;
+ }
+ iter->tr = tc->tr;
+ iter->trace_buffer = &tc->tr->max_buffer;
+ iter->cpu_file = tc->cpu;
+ m->private = iter;
+ file->private_data = m;
}
+
return ret;
}
@@ -4152,6 +4537,9 @@
tracing_snapshot_write(struct file *filp, const char __user *ubuf, size_t cnt,
loff_t *ppos)
{
+ struct seq_file *m = filp->private_data;
+ struct trace_iterator *iter = m->private;
+ struct trace_array *tr = iter->tr;
unsigned long val;
int ret;
@@ -4165,40 +4553,48 @@
mutex_lock(&trace_types_lock);
- if (current_trace->use_max_tr) {
+ if (tr->current_trace->use_max_tr) {
ret = -EBUSY;
goto out;
}
switch (val) {
case 0:
- if (current_trace->allocated_snapshot) {
- /* free spare buffer */
- ring_buffer_resize(max_tr.buffer, 1,
- RING_BUFFER_ALL_CPUS);
- set_buffer_entries(&max_tr, 1);
- tracing_reset_online_cpus(&max_tr);
- current_trace->allocated_snapshot = false;
+ if (iter->cpu_file != RING_BUFFER_ALL_CPUS) {
+ ret = -EINVAL;
+ break;
}
+ if (tr->allocated_snapshot)
+ free_snapshot(tr);
break;
case 1:
- if (!current_trace->allocated_snapshot) {
- /* allocate spare buffer */
- ret = resize_buffer_duplicate_size(&max_tr,
- &global_trace, RING_BUFFER_ALL_CPUS);
+/* Only allow per-cpu swap if the ring buffer supports it */
+#ifndef CONFIG_RING_BUFFER_ALLOW_SWAP
+ if (iter->cpu_file != RING_BUFFER_ALL_CPUS) {
+ ret = -EINVAL;
+ break;
+ }
+#endif
+ if (!tr->allocated_snapshot) {
+ ret = alloc_snapshot(tr);
if (ret < 0)
break;
- current_trace->allocated_snapshot = true;
}
-
local_irq_disable();
/* Now, we're going to swap */
- update_max_tr(&global_trace, current, smp_processor_id());
+ if (iter->cpu_file == RING_BUFFER_ALL_CPUS)
+ update_max_tr(tr, current, smp_processor_id());
+ else
+ update_max_tr_single(tr, current, iter->cpu_file);
local_irq_enable();
break;
default:
- if (current_trace->allocated_snapshot)
- tracing_reset_online_cpus(&max_tr);
+ if (tr->allocated_snapshot) {
+ if (iter->cpu_file == RING_BUFFER_ALL_CPUS)
+ tracing_reset_online_cpus(&tr->max_buffer);
+ else
+ tracing_reset(&tr->max_buffer, iter->cpu_file);
+ }
break;
}
@@ -4210,6 +4606,51 @@
mutex_unlock(&trace_types_lock);
return ret;
}
+
+static int tracing_snapshot_release(struct inode *inode, struct file *file)
+{
+ struct seq_file *m = file->private_data;
+
+ if (file->f_mode & FMODE_READ)
+ return tracing_release(inode, file);
+
+ /* If write only, the seq_file is just a stub */
+ if (m)
+ kfree(m->private);
+ kfree(m);
+
+ return 0;
+}
+
+static int tracing_buffers_open(struct inode *inode, struct file *filp);
+static ssize_t tracing_buffers_read(struct file *filp, char __user *ubuf,
+ size_t count, loff_t *ppos);
+static int tracing_buffers_release(struct inode *inode, struct file *file);
+static ssize_t tracing_buffers_splice_read(struct file *file, loff_t *ppos,
+ struct pipe_inode_info *pipe, size_t len, unsigned int flags);
+
+static int snapshot_raw_open(struct inode *inode, struct file *filp)
+{
+ struct ftrace_buffer_info *info;
+ int ret;
+
+ ret = tracing_buffers_open(inode, filp);
+ if (ret < 0)
+ return ret;
+
+ info = filp->private_data;
+
+ if (info->iter.trace->use_max_tr) {
+ tracing_buffers_release(inode, filp);
+ return -EBUSY;
+ }
+
+ info->iter.snapshot = true;
+ info->iter.trace_buffer = &info->iter.tr->max_buffer;
+
+ return ret;
+}
+
#endif /* CONFIG_TRACER_SNAPSHOT */
@@ -4237,10 +4678,9 @@
};
static const struct file_operations tracing_entries_fops = {
- .open = tracing_entries_open,
+ .open = tracing_open_generic,
.read = tracing_entries_read,
.write = tracing_entries_write,
- .release = tracing_entries_release,
.llseek = generic_file_llseek,
};
@@ -4275,20 +4715,23 @@
.read = seq_read,
.write = tracing_snapshot_write,
.llseek = tracing_seek,
- .release = tracing_release,
+ .release = tracing_snapshot_release,
};
-#endif /* CONFIG_TRACER_SNAPSHOT */
-struct ftrace_buffer_info {
- struct trace_array *tr;
- void *spare;
- int cpu;
- unsigned int read;
+static const struct file_operations snapshot_raw_fops = {
+ .open = snapshot_raw_open,
+ .read = tracing_buffers_read,
+ .release = tracing_buffers_release,
+ .splice_read = tracing_buffers_splice_read,
+ .llseek = no_llseek,
};
+#endif /* CONFIG_TRACER_SNAPSHOT */
+
static int tracing_buffers_open(struct inode *inode, struct file *filp)
{
- int cpu = (int)(long)inode->i_private;
+ struct trace_cpu *tc = inode->i_private;
+ struct trace_array *tr = tc->tr;
struct ftrace_buffer_info *info;
if (tracing_disabled)
@@ -4298,72 +4741,131 @@
if (!info)
return -ENOMEM;
- info->tr = &global_trace;
- info->cpu = cpu;
- info->spare = NULL;
+ mutex_lock(&trace_types_lock);
+
+ tr->ref++;
+
+ info->iter.tr = tr;
+ info->iter.cpu_file = tc->cpu;
+ info->iter.trace = tr->current_trace;
+ info->iter.trace_buffer = &tr->trace_buffer;
+ info->spare = NULL;
/* Force reading ring buffer for first read */
- info->read = (unsigned int)-1;
+ info->read = (unsigned int)-1;
filp->private_data = info;
+ mutex_unlock(&trace_types_lock);
+
return nonseekable_open(inode, filp);
}
+static unsigned int
+tracing_buffers_poll(struct file *filp, poll_table *poll_table)
+{
+ struct ftrace_buffer_info *info = filp->private_data;
+ struct trace_iterator *iter = &info->iter;
+
+ return trace_poll(iter, filp, poll_table);
+}
+
static ssize_t
tracing_buffers_read(struct file *filp, char __user *ubuf,
size_t count, loff_t *ppos)
{
struct ftrace_buffer_info *info = filp->private_data;
+ struct trace_iterator *iter = &info->iter;
ssize_t ret;
- size_t size;
+ ssize_t size;
if (!count)
return 0;
+ mutex_lock(&trace_types_lock);
+
+#ifdef CONFIG_TRACER_MAX_TRACE
+ if (iter->snapshot && iter->tr->current_trace->use_max_tr) {
+ size = -EBUSY;
+ goto out_unlock;
+ }
+#endif
+
if (!info->spare)
- info->spare = ring_buffer_alloc_read_page(info->tr->buffer, info->cpu);
+ info->spare = ring_buffer_alloc_read_page(iter->trace_buffer->buffer,
+ iter->cpu_file);
+ size = -ENOMEM;
if (!info->spare)
- return -ENOMEM;
+ goto out_unlock;
/* Do we have previous read data to read? */
if (info->read < PAGE_SIZE)
goto read;
- trace_access_lock(info->cpu);
- ret = ring_buffer_read_page(info->tr->buffer,
+ again:
+ trace_access_lock(iter->cpu_file);
+ ret = ring_buffer_read_page(iter->trace_buffer->buffer,
&info->spare,
count,
- info->cpu, 0);
- trace_access_unlock(info->cpu);
- if (ret < 0)
- return 0;
+ iter->cpu_file, 0);
+ trace_access_unlock(iter->cpu_file);
+
+ if (ret < 0) {
+ if (trace_empty(iter)) {
+ if ((filp->f_flags & O_NONBLOCK)) {
+ size = -EAGAIN;
+ goto out_unlock;
+ }
+ mutex_unlock(&trace_types_lock);
+ iter->trace->wait_pipe(iter);
+ mutex_lock(&trace_types_lock);
+ if (signal_pending(current)) {
+ size = -EINTR;
+ goto out_unlock;
+ }
+ goto again;
+ }
+ size = 0;
+ goto out_unlock;
+ }
info->read = 0;
-
-read:
+ read:
size = PAGE_SIZE - info->read;
if (size > count)
size = count;
ret = copy_to_user(ubuf, info->spare + info->read, size);
- if (ret == size)
- return -EFAULT;
+ if (ret == size) {
+ size = -EFAULT;
+ goto out_unlock;
+ }
size -= ret;
*ppos += size;
info->read += size;
+ out_unlock:
+ mutex_unlock(&trace_types_lock);
+
return size;
}
static int tracing_buffers_release(struct inode *inode, struct file *file)
{
struct ftrace_buffer_info *info = file->private_data;
+ struct trace_iterator *iter = &info->iter;
+
+ mutex_lock(&trace_types_lock);
+
+ WARN_ON(!iter->tr->ref);
+ iter->tr->ref--;
if (info->spare)
- ring_buffer_free_read_page(info->tr->buffer, info->spare);
+ ring_buffer_free_read_page(iter->trace_buffer->buffer, info->spare);
kfree(info);
+ mutex_unlock(&trace_types_lock);
+
return 0;
}
@@ -4428,6 +4930,7 @@
unsigned int flags)
{
struct ftrace_buffer_info *info = file->private_data;
+ struct trace_iterator *iter = &info->iter;
struct partial_page partial_def[PIPE_DEF_BUFFERS];
struct page *pages_def[PIPE_DEF_BUFFERS];
struct splice_pipe_desc spd = {
@@ -4440,10 +4943,21 @@
};
struct buffer_ref *ref;
int entries, size, i;
- size_t ret;
+ ssize_t ret;
- if (splice_grow_spd(pipe, &spd))
- return -ENOMEM;
+ mutex_lock(&trace_types_lock);
+
+#ifdef CONFIG_TRACER_MAX_TRACE
+ if (iter->snapshot && iter->tr->current_trace->use_max_tr) {
+ ret = -EBUSY;
+ goto out;
+ }
+#endif
+
+ if (splice_grow_spd(pipe, &spd)) {
+ ret = -ENOMEM;
+ goto out;
+ }
if (*ppos & (PAGE_SIZE - 1)) {
ret = -EINVAL;
@@ -4458,8 +4972,9 @@
len &= PAGE_MASK;
}
- trace_access_lock(info->cpu);
- entries = ring_buffer_entries_cpu(info->tr->buffer, info->cpu);
+ again:
+ trace_access_lock(iter->cpu_file);
+ entries = ring_buffer_entries_cpu(iter->trace_buffer->buffer, iter->cpu_file);
for (i = 0; i < pipe->buffers && len && entries; i++, len -= PAGE_SIZE) {
struct page *page;
@@ -4470,15 +4985,15 @@
break;
ref->ref = 1;
- ref->buffer = info->tr->buffer;
- ref->page = ring_buffer_alloc_read_page(ref->buffer, info->cpu);
+ ref->buffer = iter->trace_buffer->buffer;
+ ref->page = ring_buffer_alloc_read_page(ref->buffer, iter->cpu_file);
if (!ref->page) {
kfree(ref);
break;
}
r = ring_buffer_read_page(ref->buffer, &ref->page,
- len, info->cpu, 1);
+ len, iter->cpu_file, 1);
if (r < 0) {
ring_buffer_free_read_page(ref->buffer, ref->page);
kfree(ref);
@@ -4502,31 +5017,40 @@
spd.nr_pages++;
*ppos += PAGE_SIZE;
- entries = ring_buffer_entries_cpu(info->tr->buffer, info->cpu);
+ entries = ring_buffer_entries_cpu(iter->trace_buffer->buffer, iter->cpu_file);
}
- trace_access_unlock(info->cpu);
+ trace_access_unlock(iter->cpu_file);
spd.nr_pages = i;
/* did we read anything? */
if (!spd.nr_pages) {
- if (flags & SPLICE_F_NONBLOCK)
+ if ((file->f_flags & O_NONBLOCK) || (flags & SPLICE_F_NONBLOCK)) {
ret = -EAGAIN;
- else
- ret = 0;
- /* TODO: block */
- goto out;
+ goto out;
+ }
+ mutex_unlock(&trace_types_lock);
+ iter->trace->wait_pipe(iter);
+ mutex_lock(&trace_types_lock);
+ if (signal_pending(current)) {
+ ret = -EINTR;
+ goto out;
+ }
+ goto again;
}
ret = splice_to_pipe(pipe, &spd);
splice_shrink_spd(&spd);
out:
+ mutex_unlock(&trace_types_lock);
+
return ret;
}
static const struct file_operations tracing_buffers_fops = {
.open = tracing_buffers_open,
.read = tracing_buffers_read,
+ .poll = tracing_buffers_poll,
.release = tracing_buffers_release,
.splice_read = tracing_buffers_splice_read,
.llseek = no_llseek,
@@ -4536,12 +5060,14 @@
tracing_stats_read(struct file *filp, char __user *ubuf,
size_t count, loff_t *ppos)
{
- unsigned long cpu = (unsigned long)filp->private_data;
- struct trace_array *tr = &global_trace;
+ struct trace_cpu *tc = filp->private_data;
+ struct trace_array *tr = tc->tr;
+ struct trace_buffer *trace_buf = &tr->trace_buffer;
struct trace_seq *s;
unsigned long cnt;
unsigned long long t;
unsigned long usec_rem;
+ int cpu = tc->cpu;
s = kmalloc(sizeof(*s), GFP_KERNEL);
if (!s)
@@ -4549,41 +5075,41 @@
trace_seq_init(s);
- cnt = ring_buffer_entries_cpu(tr->buffer, cpu);
+ cnt = ring_buffer_entries_cpu(trace_buf->buffer, cpu);
trace_seq_printf(s, "entries: %ld\n", cnt);
- cnt = ring_buffer_overrun_cpu(tr->buffer, cpu);
+ cnt = ring_buffer_overrun_cpu(trace_buf->buffer, cpu);
trace_seq_printf(s, "overrun: %ld\n", cnt);
- cnt = ring_buffer_commit_overrun_cpu(tr->buffer, cpu);
+ cnt = ring_buffer_commit_overrun_cpu(trace_buf->buffer, cpu);
trace_seq_printf(s, "commit overrun: %ld\n", cnt);
- cnt = ring_buffer_bytes_cpu(tr->buffer, cpu);
+ cnt = ring_buffer_bytes_cpu(trace_buf->buffer, cpu);
trace_seq_printf(s, "bytes: %ld\n", cnt);
if (trace_clocks[trace_clock_id].in_ns) {
/* local or global for trace_clock */
- t = ns2usecs(ring_buffer_oldest_event_ts(tr->buffer, cpu));
+ t = ns2usecs(ring_buffer_oldest_event_ts(trace_buf->buffer, cpu));
usec_rem = do_div(t, USEC_PER_SEC);
trace_seq_printf(s, "oldest event ts: %5llu.%06lu\n",
t, usec_rem);
- t = ns2usecs(ring_buffer_time_stamp(tr->buffer, cpu));
+ t = ns2usecs(ring_buffer_time_stamp(trace_buf->buffer, cpu));
usec_rem = do_div(t, USEC_PER_SEC);
trace_seq_printf(s, "now ts: %5llu.%06lu\n", t, usec_rem);
} else {
/* counter or tsc mode for trace_clock */
trace_seq_printf(s, "oldest event ts: %llu\n",
- ring_buffer_oldest_event_ts(tr->buffer, cpu));
+ ring_buffer_oldest_event_ts(trace_buf->buffer, cpu));
trace_seq_printf(s, "now ts: %llu\n",
- ring_buffer_time_stamp(tr->buffer, cpu));
+ ring_buffer_time_stamp(trace_buf->buffer, cpu));
}
- cnt = ring_buffer_dropped_events_cpu(tr->buffer, cpu);
+ cnt = ring_buffer_dropped_events_cpu(trace_buf->buffer, cpu);
trace_seq_printf(s, "dropped events: %ld\n", cnt);
- cnt = ring_buffer_read_events_cpu(tr->buffer, cpu);
+ cnt = ring_buffer_read_events_cpu(trace_buf->buffer, cpu);
trace_seq_printf(s, "read events: %ld\n", cnt);
count = simple_read_from_buffer(ubuf, count, ppos, s->buffer, s->len);
@@ -4635,60 +5161,161 @@
.read = tracing_read_dyn_info,
.llseek = generic_file_llseek,
};
-#endif
+#endif /* CONFIG_DYNAMIC_FTRACE */
-static struct dentry *d_tracer;
-
-struct dentry *tracing_init_dentry(void)
+#if defined(CONFIG_TRACER_SNAPSHOT) && defined(CONFIG_DYNAMIC_FTRACE)
+static void
+ftrace_snapshot(unsigned long ip, unsigned long parent_ip, void **data)
{
- static int once;
+ tracing_snapshot();
+}
- if (d_tracer)
- return d_tracer;
+static void
+ftrace_count_snapshot(unsigned long ip, unsigned long parent_ip, void **data)
+{
+ unsigned long *count = (long *)data;
+
+ if (!*count)
+ return;
+
+ if (*count != -1)
+ (*count)--;
+
+ tracing_snapshot();
+}
+
+static int
+ftrace_snapshot_print(struct seq_file *m, unsigned long ip,
+ struct ftrace_probe_ops *ops, void *data)
+{
+ long count = (long)data;
+
+ seq_printf(m, "%ps:", (void *)ip);
+
+ seq_printf(m, "snapshot");
+
+ if (count == -1)
+ seq_printf(m, ":unlimited\n");
+ else
+ seq_printf(m, ":count=%ld\n", count);
+
+ return 0;
+}
+
+static struct ftrace_probe_ops snapshot_probe_ops = {
+ .func = ftrace_snapshot,
+ .print = ftrace_snapshot_print,
+};
+
+static struct ftrace_probe_ops snapshot_count_probe_ops = {
+ .func = ftrace_count_snapshot,
+ .print = ftrace_snapshot_print,
+};
+
+static int
+ftrace_trace_snapshot_callback(struct ftrace_hash *hash,
+ char *glob, char *cmd, char *param, int enable)
+{
+ struct ftrace_probe_ops *ops;
+ void *count = (void *)-1;
+ char *number;
+ int ret;
+
+ /* hash funcs only work with set_ftrace_filter */
+ if (!enable)
+ return -EINVAL;
+
+ ops = param ? &snapshot_count_probe_ops : &snapshot_probe_ops;
+
+ if (glob[0] == '!') {
+ unregister_ftrace_function_probe_func(glob+1, ops);
+ return 0;
+ }
+
+ if (!param)
+ goto out_reg;
+
+ number = strsep(¶m, ":");
+
+ if (!strlen(number))
+ goto out_reg;
+
+ /*
+ * We use the callback data field (which is a pointer)
+ * as our counter.
+ */
+ ret = kstrtoul(number, 0, (unsigned long *)&count);
+ if (ret)
+ return ret;
+
+ out_reg:
+ ret = register_ftrace_function_probe(glob, ops, count);
+
+ if (ret >= 0)
+ alloc_snapshot(&global_trace);
+
+ return ret < 0 ? ret : 0;
+}
+
+static struct ftrace_func_command ftrace_snapshot_cmd = {
+ .name = "snapshot",
+ .func = ftrace_trace_snapshot_callback,
+};
+
+static int register_snapshot_cmd(void)
+{
+ return register_ftrace_command(&ftrace_snapshot_cmd);
+}
+#else
+static inline int register_snapshot_cmd(void) { return 0; }
+#endif /* defined(CONFIG_TRACER_SNAPSHOT) && defined(CONFIG_DYNAMIC_FTRACE) */
+
+struct dentry *tracing_init_dentry_tr(struct trace_array *tr)
+{
+ if (tr->dir)
+ return tr->dir;
if (!debugfs_initialized())
return NULL;
- d_tracer = debugfs_create_dir("tracing", NULL);
+ if (tr->flags & TRACE_ARRAY_FL_GLOBAL)
+ tr->dir = debugfs_create_dir("tracing", NULL);
- if (!d_tracer && !once) {
- once = 1;
- pr_warning("Could not create debugfs directory 'tracing'\n");
- return NULL;
- }
+ if (!tr->dir)
+ pr_warn_once("Could not create debugfs directory 'tracing'\n");
- return d_tracer;
+ return tr->dir;
}
-static struct dentry *d_percpu;
-
-static struct dentry *tracing_dentry_percpu(void)
+struct dentry *tracing_init_dentry(void)
{
- static int once;
+ return tracing_init_dentry_tr(&global_trace);
+}
+
+static struct dentry *tracing_dentry_percpu(struct trace_array *tr, int cpu)
+{
struct dentry *d_tracer;
- if (d_percpu)
- return d_percpu;
+ if (tr->percpu_dir)
+ return tr->percpu_dir;
- d_tracer = tracing_init_dentry();
-
+ d_tracer = tracing_init_dentry_tr(tr);
if (!d_tracer)
return NULL;
- d_percpu = debugfs_create_dir("per_cpu", d_tracer);
+ tr->percpu_dir = debugfs_create_dir("per_cpu", d_tracer);
- if (!d_percpu && !once) {
- once = 1;
- pr_warning("Could not create debugfs directory 'per_cpu'\n");
- return NULL;
- }
+ WARN_ONCE(!tr->percpu_dir,
+ "Could not create debugfs directory 'per_cpu/%d'\n", cpu);
- return d_percpu;
+ return tr->percpu_dir;
}
-static void tracing_init_debugfs_percpu(long cpu)
+static void
+tracing_init_debugfs_percpu(struct trace_array *tr, long cpu)
{
- struct dentry *d_percpu = tracing_dentry_percpu();
+ struct trace_array_cpu *data = per_cpu_ptr(tr->trace_buffer.data, cpu);
+ struct dentry *d_percpu = tracing_dentry_percpu(tr, cpu);
struct dentry *d_cpu;
char cpu_dir[30]; /* 30 characters should be more than enough */
@@ -4704,20 +5331,28 @@
/* per cpu trace_pipe */
trace_create_file("trace_pipe", 0444, d_cpu,
- (void *) cpu, &tracing_pipe_fops);
+ (void *)&data->trace_cpu, &tracing_pipe_fops);
/* per cpu trace */
trace_create_file("trace", 0644, d_cpu,
- (void *) cpu, &tracing_fops);
+ (void *)&data->trace_cpu, &tracing_fops);
trace_create_file("trace_pipe_raw", 0444, d_cpu,
- (void *) cpu, &tracing_buffers_fops);
+ (void *)&data->trace_cpu, &tracing_buffers_fops);
trace_create_file("stats", 0444, d_cpu,
- (void *) cpu, &tracing_stats_fops);
+ (void *)&data->trace_cpu, &tracing_stats_fops);
trace_create_file("buffer_size_kb", 0444, d_cpu,
- (void *) cpu, &tracing_entries_fops);
+ (void *)&data->trace_cpu, &tracing_entries_fops);
+
+#ifdef CONFIG_TRACER_SNAPSHOT
+ trace_create_file("snapshot", 0644, d_cpu,
+ (void *)&data->trace_cpu, &snapshot_fops);
+
+ trace_create_file("snapshot_raw", 0444, d_cpu,
+ (void *)&data->trace_cpu, &snapshot_raw_fops);
+#endif
}
#ifdef CONFIG_FTRACE_SELFTEST
@@ -4728,6 +5363,7 @@
struct trace_option_dentry {
struct tracer_opt *opt;
struct tracer_flags *flags;
+ struct trace_array *tr;
struct dentry *entry;
};
@@ -4763,7 +5399,7 @@
if (!!(topt->flags->val & topt->opt->bit) != val) {
mutex_lock(&trace_types_lock);
- ret = __set_tracer_option(current_trace, topt->flags,
+ ret = __set_tracer_option(topt->tr->current_trace, topt->flags,
topt->opt, !val);
mutex_unlock(&trace_types_lock);
if (ret)
@@ -4802,6 +5438,7 @@
trace_options_core_write(struct file *filp, const char __user *ubuf, size_t cnt,
loff_t *ppos)
{
+ struct trace_array *tr = &global_trace;
long index = (long)filp->private_data;
unsigned long val;
int ret;
@@ -4814,7 +5451,7 @@
return -EINVAL;
mutex_lock(&trace_types_lock);
- ret = set_tracer_flag(1 << index, val);
+ ret = set_tracer_flag(tr, 1 << index, val);
mutex_unlock(&trace_types_lock);
if (ret < 0)
@@ -4848,40 +5485,41 @@
}
-static struct dentry *trace_options_init_dentry(void)
+static struct dentry *trace_options_init_dentry(struct trace_array *tr)
{
struct dentry *d_tracer;
- static struct dentry *t_options;
- if (t_options)
- return t_options;
+ if (tr->options)
+ return tr->options;
- d_tracer = tracing_init_dentry();
+ d_tracer = tracing_init_dentry_tr(tr);
if (!d_tracer)
return NULL;
- t_options = debugfs_create_dir("options", d_tracer);
- if (!t_options) {
+ tr->options = debugfs_create_dir("options", d_tracer);
+ if (!tr->options) {
pr_warning("Could not create debugfs directory 'options'\n");
return NULL;
}
- return t_options;
+ return tr->options;
}
static void
-create_trace_option_file(struct trace_option_dentry *topt,
+create_trace_option_file(struct trace_array *tr,
+ struct trace_option_dentry *topt,
struct tracer_flags *flags,
struct tracer_opt *opt)
{
struct dentry *t_options;
- t_options = trace_options_init_dentry();
+ t_options = trace_options_init_dentry(tr);
if (!t_options)
return;
topt->flags = flags;
topt->opt = opt;
+ topt->tr = tr;
topt->entry = trace_create_file(opt->name, 0644, t_options, topt,
&trace_options_fops);
@@ -4889,7 +5527,7 @@
}
static struct trace_option_dentry *
-create_trace_option_files(struct tracer *tracer)
+create_trace_option_files(struct trace_array *tr, struct tracer *tracer)
{
struct trace_option_dentry *topts;
struct tracer_flags *flags;
@@ -4914,7 +5552,7 @@
return NULL;
for (cnt = 0; opts[cnt].name; cnt++)
- create_trace_option_file(&topts[cnt], flags,
+ create_trace_option_file(tr, &topts[cnt], flags,
&opts[cnt]);
return topts;
@@ -4937,11 +5575,12 @@
}
static struct dentry *
-create_trace_option_core_file(const char *option, long index)
+create_trace_option_core_file(struct trace_array *tr,
+ const char *option, long index)
{
struct dentry *t_options;
- t_options = trace_options_init_dentry();
+ t_options = trace_options_init_dentry(tr);
if (!t_options)
return NULL;
@@ -4949,17 +5588,17 @@
&trace_options_core_fops);
}
-static __init void create_trace_options_dir(void)
+static __init void create_trace_options_dir(struct trace_array *tr)
{
struct dentry *t_options;
int i;
- t_options = trace_options_init_dentry();
+ t_options = trace_options_init_dentry(tr);
if (!t_options)
return;
for (i = 0; trace_options[i]; i++)
- create_trace_option_core_file(trace_options[i], i);
+ create_trace_option_core_file(tr, trace_options[i], i);
}
static ssize_t
@@ -4967,7 +5606,7 @@
size_t cnt, loff_t *ppos)
{
struct trace_array *tr = filp->private_data;
- struct ring_buffer *buffer = tr->buffer;
+ struct ring_buffer *buffer = tr->trace_buffer.buffer;
char buf[64];
int r;
@@ -4986,7 +5625,7 @@
size_t cnt, loff_t *ppos)
{
struct trace_array *tr = filp->private_data;
- struct ring_buffer *buffer = tr->buffer;
+ struct ring_buffer *buffer = tr->trace_buffer.buffer;
unsigned long val;
int ret;
@@ -4998,12 +5637,12 @@
mutex_lock(&trace_types_lock);
if (val) {
ring_buffer_record_on(buffer);
- if (current_trace->start)
- current_trace->start(tr);
+ if (tr->current_trace->start)
+ tr->current_trace->start(tr);
} else {
ring_buffer_record_off(buffer);
- if (current_trace->stop)
- current_trace->stop(tr);
+ if (tr->current_trace->stop)
+ tr->current_trace->stop(tr);
}
mutex_unlock(&trace_types_lock);
}
@@ -5020,23 +5659,310 @@
.llseek = default_llseek,
};
+struct dentry *trace_instance_dir;
+
+static void
+init_tracer_debugfs(struct trace_array *tr, struct dentry *d_tracer);
+
+static void init_trace_buffers(struct trace_array *tr, struct trace_buffer *buf)
+{
+ int cpu;
+
+ for_each_tracing_cpu(cpu) {
+ memset(per_cpu_ptr(buf->data, cpu), 0, sizeof(struct trace_array_cpu));
+ per_cpu_ptr(buf->data, cpu)->trace_cpu.cpu = cpu;
+ per_cpu_ptr(buf->data, cpu)->trace_cpu.tr = tr;
+ }
+}
+
+static int
+allocate_trace_buffer(struct trace_array *tr, struct trace_buffer *buf, int size)
+{
+ enum ring_buffer_flags rb_flags;
+
+ rb_flags = trace_flags & TRACE_ITER_OVERWRITE ? RB_FL_OVERWRITE : 0;
+
+ buf->buffer = ring_buffer_alloc(size, rb_flags);
+ if (!buf->buffer)
+ return -ENOMEM;
+
+ buf->data = alloc_percpu(struct trace_array_cpu);
+ if (!buf->data) {
+ ring_buffer_free(buf->buffer);
+ return -ENOMEM;
+ }
+
+ init_trace_buffers(tr, buf);
+
+ /* Allocate the first page for all buffers */
+ set_buffer_entries(&tr->trace_buffer,
+ ring_buffer_size(tr->trace_buffer.buffer, 0));
+
+ return 0;
+}
+
+static int allocate_trace_buffers(struct trace_array *tr, int size)
+{
+ int ret;
+
+ ret = allocate_trace_buffer(tr, &tr->trace_buffer, size);
+ if (ret)
+ return ret;
+
+#ifdef CONFIG_TRACER_MAX_TRACE
+ ret = allocate_trace_buffer(tr, &tr->max_buffer,
+ allocate_snapshot ? size : 1);
+ if (WARN_ON(ret)) {
+ ring_buffer_free(tr->trace_buffer.buffer);
+ free_percpu(tr->trace_buffer.data);
+ return -ENOMEM;
+ }
+ tr->allocated_snapshot = allocate_snapshot;
+
+ /*
+ * Only the top level trace array gets its snapshot allocated
+ * from the kernel command line.
+ */
+ allocate_snapshot = false;
+#endif
+ return 0;
+}
+
+static int new_instance_create(const char *name)
+{
+ struct trace_array *tr;
+ int ret;
+
+ mutex_lock(&trace_types_lock);
+
+ ret = -EEXIST;
+ list_for_each_entry(tr, &ftrace_trace_arrays, list) {
+ if (tr->name && strcmp(tr->name, name) == 0)
+ goto out_unlock;
+ }
+
+ ret = -ENOMEM;
+ tr = kzalloc(sizeof(*tr), GFP_KERNEL);
+ if (!tr)
+ goto out_unlock;
+
+ tr->name = kstrdup(name, GFP_KERNEL);
+ if (!tr->name)
+ goto out_free_tr;
+
+ raw_spin_lock_init(&tr->start_lock);
+
+ tr->current_trace = &nop_trace;
+
+ INIT_LIST_HEAD(&tr->systems);
+ INIT_LIST_HEAD(&tr->events);
+
+ if (allocate_trace_buffers(tr, trace_buf_size) < 0)
+ goto out_free_tr;
+
+ /* Holder for file callbacks */
+ tr->trace_cpu.cpu = RING_BUFFER_ALL_CPUS;
+ tr->trace_cpu.tr = tr;
+
+ tr->dir = debugfs_create_dir(name, trace_instance_dir);
+ if (!tr->dir)
+ goto out_free_tr;
+
+ ret = event_trace_add_tracer(tr->dir, tr);
+ if (ret)
+ goto out_free_tr;
+
+ init_tracer_debugfs(tr, tr->dir);
+
+ list_add(&tr->list, &ftrace_trace_arrays);
+
+ mutex_unlock(&trace_types_lock);
+
+ return 0;
+
+ out_free_tr:
+ if (tr->trace_buffer.buffer)
+ ring_buffer_free(tr->trace_buffer.buffer);
+ kfree(tr->name);
+ kfree(tr);
+
+ out_unlock:
+ mutex_unlock(&trace_types_lock);
+
+ return ret;
+
+}
+
+static int instance_delete(const char *name)
+{
+ struct trace_array *tr;
+ int found = 0;
+ int ret;
+
+ mutex_lock(&trace_types_lock);
+
+ ret = -ENODEV;
+ list_for_each_entry(tr, &ftrace_trace_arrays, list) {
+ if (tr->name && strcmp(tr->name, name) == 0) {
+ found = 1;
+ break;
+ }
+ }
+ if (!found)
+ goto out_unlock;
+
+ ret = -EBUSY;
+ if (tr->ref)
+ goto out_unlock;
+
+ list_del(&tr->list);
+
+ event_trace_del_tracer(tr);
+ debugfs_remove_recursive(tr->dir);
+ free_percpu(tr->trace_buffer.data);
+ ring_buffer_free(tr->trace_buffer.buffer);
+
+ kfree(tr->name);
+ kfree(tr);
+
+ ret = 0;
+
+ out_unlock:
+ mutex_unlock(&trace_types_lock);
+
+ return ret;
+}
+
+static int instance_mkdir (struct inode *inode, struct dentry *dentry, umode_t mode)
+{
+ struct dentry *parent;
+ int ret;
+
+ /* Paranoid: Make sure the parent is the "instances" directory */
+ parent = hlist_entry(inode->i_dentry.first, struct dentry, d_alias);
+ if (WARN_ON_ONCE(parent != trace_instance_dir))
+ return -ENOENT;
+
+ /*
+ * The inode mutex is locked, but debugfs_create_dir() will also
+ * take the mutex. As the instances directory can not be destroyed
+ * or changed in any other way, it is safe to unlock it, and
+ * let the dentry try. If two users try to make the same dir at
+ * the same time, then the new_instance_create() will determine the
+ * winner.
+ */
+ mutex_unlock(&inode->i_mutex);
+
+ ret = new_instance_create(dentry->d_iname);
+
+ mutex_lock(&inode->i_mutex);
+
+ return ret;
+}
+
+static int instance_rmdir(struct inode *inode, struct dentry *dentry)
+{
+ struct dentry *parent;
+ int ret;
+
+ /* Paranoid: Make sure the parent is the "instances" directory */
+ parent = hlist_entry(inode->i_dentry.first, struct dentry, d_alias);
+ if (WARN_ON_ONCE(parent != trace_instance_dir))
+ return -ENOENT;
+
+ /* The caller did a dget() on dentry */
+ mutex_unlock(&dentry->d_inode->i_mutex);
+
+ /*
+ * The inode mutex is locked, but debugfs_create_dir() will also
+ * take the mutex. As the instances directory can not be destroyed
+ * or changed in any other way, it is safe to unlock it, and
+ * let the dentry try. If two users try to make the same dir at
+ * the same time, then the instance_delete() will determine the
+ * winner.
+ */
+ mutex_unlock(&inode->i_mutex);
+
+ ret = instance_delete(dentry->d_iname);
+
+ mutex_lock_nested(&inode->i_mutex, I_MUTEX_PARENT);
+ mutex_lock(&dentry->d_inode->i_mutex);
+
+ return ret;
+}
+
+static const struct inode_operations instance_dir_inode_operations = {
+ .lookup = simple_lookup,
+ .mkdir = instance_mkdir,
+ .rmdir = instance_rmdir,
+};
+
+static __init void create_trace_instances(struct dentry *d_tracer)
+{
+ trace_instance_dir = debugfs_create_dir("instances", d_tracer);
+ if (WARN_ON(!trace_instance_dir))
+ return;
+
+ /* Hijack the dir inode operations, to allow mkdir */
+ trace_instance_dir->d_inode->i_op = &instance_dir_inode_operations;
+}
+
+static void
+init_tracer_debugfs(struct trace_array *tr, struct dentry *d_tracer)
+{
+ int cpu;
+
+ trace_create_file("trace_options", 0644, d_tracer,
+ tr, &tracing_iter_fops);
+
+ trace_create_file("trace", 0644, d_tracer,
+ (void *)&tr->trace_cpu, &tracing_fops);
+
+ trace_create_file("trace_pipe", 0444, d_tracer,
+ (void *)&tr->trace_cpu, &tracing_pipe_fops);
+
+ trace_create_file("buffer_size_kb", 0644, d_tracer,
+ (void *)&tr->trace_cpu, &tracing_entries_fops);
+
+ trace_create_file("buffer_total_size_kb", 0444, d_tracer,
+ tr, &tracing_total_entries_fops);
+
+ trace_create_file("free_buffer", 0644, d_tracer,
+ tr, &tracing_free_buffer_fops);
+
+ trace_create_file("trace_marker", 0220, d_tracer,
+ tr, &tracing_mark_fops);
+
+ trace_create_file("trace_clock", 0644, d_tracer, tr,
+ &trace_clock_fops);
+
+ trace_create_file("tracing_on", 0644, d_tracer,
+ tr, &rb_simple_fops);
+
+#ifdef CONFIG_TRACER_SNAPSHOT
+ trace_create_file("snapshot", 0644, d_tracer,
+ (void *)&tr->trace_cpu, &snapshot_fops);
+#endif
+
+ for_each_tracing_cpu(cpu)
+ tracing_init_debugfs_percpu(tr, cpu);
+
+}
+
static __init int tracer_init_debugfs(void)
{
struct dentry *d_tracer;
- int cpu;
trace_access_lock_init();
d_tracer = tracing_init_dentry();
+ if (!d_tracer)
+ return 0;
- trace_create_file("trace_options", 0644, d_tracer,
- NULL, &tracing_iter_fops);
+ init_tracer_debugfs(&global_trace, d_tracer);
trace_create_file("tracing_cpumask", 0644, d_tracer,
- NULL, &tracing_cpumask_fops);
-
- trace_create_file("trace", 0644, d_tracer,
- (void *) TRACE_PIPE_ALL_CPU, &tracing_fops);
+ &global_trace, &tracing_cpumask_fops);
trace_create_file("available_tracers", 0444, d_tracer,
&global_trace, &show_traces_fops);
@@ -5055,44 +5981,17 @@
trace_create_file("README", 0444, d_tracer,
NULL, &tracing_readme_fops);
- trace_create_file("trace_pipe", 0444, d_tracer,
- (void *) TRACE_PIPE_ALL_CPU, &tracing_pipe_fops);
-
- trace_create_file("buffer_size_kb", 0644, d_tracer,
- (void *) RING_BUFFER_ALL_CPUS, &tracing_entries_fops);
-
- trace_create_file("buffer_total_size_kb", 0444, d_tracer,
- &global_trace, &tracing_total_entries_fops);
-
- trace_create_file("free_buffer", 0644, d_tracer,
- &global_trace, &tracing_free_buffer_fops);
-
- trace_create_file("trace_marker", 0220, d_tracer,
- NULL, &tracing_mark_fops);
-
trace_create_file("saved_cmdlines", 0444, d_tracer,
NULL, &tracing_saved_cmdlines_fops);
- trace_create_file("trace_clock", 0644, d_tracer, NULL,
- &trace_clock_fops);
-
- trace_create_file("tracing_on", 0644, d_tracer,
- &global_trace, &rb_simple_fops);
-
#ifdef CONFIG_DYNAMIC_FTRACE
trace_create_file("dyn_ftrace_total_info", 0444, d_tracer,
&ftrace_update_tot_cnt, &tracing_dyn_info_fops);
#endif
-#ifdef CONFIG_TRACER_SNAPSHOT
- trace_create_file("snapshot", 0644, d_tracer,
- (void *) TRACE_PIPE_ALL_CPU, &snapshot_fops);
-#endif
+ create_trace_instances(d_tracer);
- create_trace_options_dir();
-
- for_each_tracing_cpu(cpu)
- tracing_init_debugfs_percpu(cpu);
+ create_trace_options_dir(&global_trace);
return 0;
}
@@ -5148,8 +6047,8 @@
trace_printk_seq(struct trace_seq *s)
{
/* Probably should print a warning here. */
- if (s->len >= 1000)
- s->len = 1000;
+ if (s->len >= TRACE_MAX_PRINT)
+ s->len = TRACE_MAX_PRINT;
/* should be zero ended, but we are paranoid. */
s->buffer[s->len] = 0;
@@ -5162,46 +6061,43 @@
void trace_init_global_iter(struct trace_iterator *iter)
{
iter->tr = &global_trace;
- iter->trace = current_trace;
- iter->cpu_file = TRACE_PIPE_ALL_CPU;
+ iter->trace = iter->tr->current_trace;
+ iter->cpu_file = RING_BUFFER_ALL_CPUS;
+ iter->trace_buffer = &global_trace.trace_buffer;
}
-static void
-__ftrace_dump(bool disable_tracing, enum ftrace_dump_mode oops_dump_mode)
+void ftrace_dump(enum ftrace_dump_mode oops_dump_mode)
{
- static arch_spinlock_t ftrace_dump_lock =
- (arch_spinlock_t)__ARCH_SPIN_LOCK_UNLOCKED;
/* use static because iter can be a bit big for the stack */
static struct trace_iterator iter;
+ static atomic_t dump_running;
unsigned int old_userobj;
- static int dump_ran;
unsigned long flags;
int cnt = 0, cpu;
- /* only one dump */
- local_irq_save(flags);
- arch_spin_lock(&ftrace_dump_lock);
- if (dump_ran)
- goto out;
-
- dump_ran = 1;
-
- tracing_off();
-
- /* Did function tracer already get disabled? */
- if (ftrace_is_dead()) {
- printk("# WARNING: FUNCTION TRACING IS CORRUPTED\n");
- printk("# MAY BE MISSING FUNCTION EVENTS\n");
+ /* Only allow one dump user at a time. */
+ if (atomic_inc_return(&dump_running) != 1) {
+ atomic_dec(&dump_running);
+ return;
}
- if (disable_tracing)
- ftrace_kill();
+ /*
+ * Always turn off tracing when we dump.
+ * We don't need to show trace output of what happens
+ * between multiple crashes.
+ *
+ * If the user does a sysrq-z, then they can re-enable
+ * tracing with echo 1 > tracing_on.
+ */
+ tracing_off();
+
+ local_irq_save(flags);
/* Simulate the iterator */
trace_init_global_iter(&iter);
for_each_tracing_cpu(cpu) {
- atomic_inc(&iter.tr->data[cpu]->disabled);
+ atomic_inc(&per_cpu_ptr(iter.tr->trace_buffer.data, cpu)->disabled);
}
old_userobj = trace_flags & TRACE_ITER_SYM_USEROBJ;
@@ -5211,7 +6107,7 @@
switch (oops_dump_mode) {
case DUMP_ALL:
- iter.cpu_file = TRACE_PIPE_ALL_CPU;
+ iter.cpu_file = RING_BUFFER_ALL_CPUS;
break;
case DUMP_ORIG:
iter.cpu_file = raw_smp_processor_id();
@@ -5220,11 +6116,17 @@
goto out_enable;
default:
printk(KERN_TRACE "Bad dumping mode, switching to all CPUs dump\n");
- iter.cpu_file = TRACE_PIPE_ALL_CPU;
+ iter.cpu_file = RING_BUFFER_ALL_CPUS;
}
printk(KERN_TRACE "Dumping ftrace buffer:\n");
+ /* Did function tracer already get disabled? */
+ if (ftrace_is_dead()) {
+ printk("# WARNING: FUNCTION TRACING IS CORRUPTED\n");
+ printk("# MAY BE MISSING FUNCTION EVENTS\n");
+ }
+
/*
* We need to stop all tracing on all CPUS to read the
* the next buffer. This is a bit expensive, but is
@@ -5264,33 +6166,19 @@
printk(KERN_TRACE "---------------------------------\n");
out_enable:
- /* Re-enable tracing if requested */
- if (!disable_tracing) {
- trace_flags |= old_userobj;
+ trace_flags |= old_userobj;
- for_each_tracing_cpu(cpu) {
- atomic_dec(&iter.tr->data[cpu]->disabled);
- }
- tracing_on();
+ for_each_tracing_cpu(cpu) {
+ atomic_dec(&per_cpu_ptr(iter.trace_buffer->data, cpu)->disabled);
}
-
- out:
- arch_spin_unlock(&ftrace_dump_lock);
+ atomic_dec(&dump_running);
local_irq_restore(flags);
}
-
-/* By default: disable tracing after the dump */
-void ftrace_dump(enum ftrace_dump_mode oops_dump_mode)
-{
- __ftrace_dump(true, oops_dump_mode);
-}
EXPORT_SYMBOL_GPL(ftrace_dump);
__init static int tracer_alloc_buffers(void)
{
int ring_buf_size;
- enum ring_buffer_flags rb_flags;
- int i;
int ret = -ENOMEM;
@@ -5311,49 +6199,27 @@
else
ring_buf_size = 1;
- rb_flags = trace_flags & TRACE_ITER_OVERWRITE ? RB_FL_OVERWRITE : 0;
-
cpumask_copy(tracing_buffer_mask, cpu_possible_mask);
cpumask_copy(tracing_cpumask, cpu_all_mask);
+ raw_spin_lock_init(&global_trace.start_lock);
+
/* TODO: make the number of buffers hot pluggable with CPUS */
- global_trace.buffer = ring_buffer_alloc(ring_buf_size, rb_flags);
- if (!global_trace.buffer) {
+ if (allocate_trace_buffers(&global_trace, ring_buf_size) < 0) {
printk(KERN_ERR "tracer: failed to allocate ring buffer!\n");
WARN_ON(1);
goto out_free_cpumask;
}
+
if (global_trace.buffer_disabled)
tracing_off();
-
-#ifdef CONFIG_TRACER_MAX_TRACE
- max_tr.buffer = ring_buffer_alloc(1, rb_flags);
- if (!max_tr.buffer) {
- printk(KERN_ERR "tracer: failed to allocate max ring buffer!\n");
- WARN_ON(1);
- ring_buffer_free(global_trace.buffer);
- goto out_free_cpumask;
- }
-#endif
-
- /* Allocate the first page for all buffers */
- for_each_tracing_cpu(i) {
- global_trace.data[i] = &per_cpu(global_trace_cpu, i);
- max_tr.data[i] = &per_cpu(max_tr_data, i);
- }
-
- set_buffer_entries(&global_trace,
- ring_buffer_size(global_trace.buffer, 0));
-#ifdef CONFIG_TRACER_MAX_TRACE
- set_buffer_entries(&max_tr, 1);
-#endif
-
trace_init_cmdlines();
- init_irq_work(&trace_work_wakeup, trace_wake_up);
register_tracer(&nop_trace);
+ global_trace.current_trace = &nop_trace;
+
/* All seems OK, enable tracing */
tracing_disabled = 0;
@@ -5362,16 +6228,32 @@
register_die_notifier(&trace_die_notifier);
+ global_trace.flags = TRACE_ARRAY_FL_GLOBAL;
+
+ /* Holder for file callbacks */
+ global_trace.trace_cpu.cpu = RING_BUFFER_ALL_CPUS;
+ global_trace.trace_cpu.tr = &global_trace;
+
+ INIT_LIST_HEAD(&global_trace.systems);
+ INIT_LIST_HEAD(&global_trace.events);
+ list_add(&global_trace.list, &ftrace_trace_arrays);
+
while (trace_boot_options) {
char *option;
option = strsep(&trace_boot_options, ",");
- trace_set_options(option);
+ trace_set_options(&global_trace, option);
}
+ register_snapshot_cmd();
+
return 0;
out_free_cpumask:
+ free_percpu(global_trace.trace_buffer.data);
+#ifdef CONFIG_TRACER_MAX_TRACE
+ free_percpu(global_trace.max_buffer.data);
+#endif
free_cpumask_var(tracing_cpumask);
out_free_buffer_mask:
free_cpumask_var(tracing_buffer_mask);