jbd2: Use tracepoints for history file
The /proc/fs/jbd2/<dev>/history was maintained manually; by using
tracepoints, we can get all of the existing functionality of the /proc
file plus extra capabilities thanks to the ftrace infrastructure. We
save memory as a bonus.
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
diff --git a/include/linux/jbd2.h b/include/linux/jbd2.h
index 52695d3..f1011f7 100644
--- a/include/linux/jbd2.h
+++ b/include/linux/jbd2.h
@@ -464,9 +464,9 @@
*/
struct transaction_chp_stats_s {
unsigned long cs_chp_time;
- unsigned long cs_forced_to_close;
- unsigned long cs_written;
- unsigned long cs_dropped;
+ __u32 cs_forced_to_close;
+ __u32 cs_written;
+ __u32 cs_dropped;
};
/* The transaction_t type is the guts of the journaling mechanism. It
@@ -668,23 +668,16 @@
unsigned long rs_flushing;
unsigned long rs_logging;
- unsigned long rs_handle_count;
- unsigned long rs_blocks;
- unsigned long rs_blocks_logged;
+ __u32 rs_handle_count;
+ __u32 rs_blocks;
+ __u32 rs_blocks_logged;
};
struct transaction_stats_s {
- int ts_type;
unsigned long ts_tid;
- union {
- struct transaction_run_stats_s run;
- struct transaction_chp_stats_s chp;
- } u;
+ struct transaction_run_stats_s run;
};
-#define JBD2_STATS_RUN 1
-#define JBD2_STATS_CHECKPOINT 2
-
static inline unsigned long
jbd2_time_diff(unsigned long start, unsigned long end)
{
@@ -988,12 +981,6 @@
/*
* Journal statistics
*/
- struct transaction_stats_s *j_history;
- int j_history_max;
- int j_history_cur;
- /*
- * Protect the transactions statistics history
- */
spinlock_t j_history_lock;
struct proc_dir_entry *j_proc_entry;
struct transaction_stats_s j_stats;