perf tools: Add code to support PERF_SAMPLE_BRANCH_STACK
This patch adds:
- ability to parse samples with PERF_SAMPLE_BRANCH_STACK
- sort on branches (dso_from, symbol_from, dso_to, symbol_to, mispredict)
- build histograms on branches
Signed-off-by: Roberto Agostino Vitillo <ravitillo@lbl.gov>
Signed-off-by: Stephane Eranian <eranian@google.com>
Cc: peterz@infradead.org
Cc: acme@redhat.com
Cc: robert.richter@amd.com
Cc: ming.m.lin@intel.com
Cc: andi@firstfloor.org
Cc: asharma@fb.com
Cc: vweaver1@eecs.utk.edu
Cc: khandual@linux.vnet.ibm.com
Cc: dsahern@gmail.com
Link: http://lkml.kernel.org/r/1328826068-11713-12-git-send-email-eranian@google.com
Signed-off-by: Ingo Molnar <mingo@elte.hu>
diff --git a/tools/perf/util/session.c b/tools/perf/util/session.c
index 9f833cf..bec8a32 100644
--- a/tools/perf/util/session.c
+++ b/tools/perf/util/session.c
@@ -229,6 +229,63 @@
return 0;
}
+static const u8 cpumodes[] = {
+ PERF_RECORD_MISC_USER,
+ PERF_RECORD_MISC_KERNEL,
+ PERF_RECORD_MISC_GUEST_USER,
+ PERF_RECORD_MISC_GUEST_KERNEL
+};
+#define NCPUMODES (sizeof(cpumodes)/sizeof(u8))
+
+static void ip__resolve_ams(struct machine *self, struct thread *thread,
+ struct addr_map_symbol *ams,
+ u64 ip)
+{
+ struct addr_location al;
+ size_t i;
+ u8 m;
+
+ memset(&al, 0, sizeof(al));
+
+ for (i = 0; i < NCPUMODES; i++) {
+ m = cpumodes[i];
+ /*
+ * We cannot use the header.misc hint to determine whether a
+ * branch stack address is user, kernel, guest, hypervisor.
+ * Branches may straddle the kernel/user/hypervisor boundaries.
+ * Thus, we have to try consecutively until we find a match
+ * or else, the symbol is unknown
+ */
+ thread__find_addr_location(thread, self, m, MAP__FUNCTION,
+ ip, &al, NULL);
+ if (al.sym)
+ goto found;
+ }
+found:
+ ams->addr = ip;
+ ams->sym = al.sym;
+ ams->map = al.map;
+}
+
+struct branch_info *machine__resolve_bstack(struct machine *self,
+ struct thread *thr,
+ struct branch_stack *bs)
+{
+ struct branch_info *bi;
+ unsigned int i;
+
+ bi = calloc(bs->nr, sizeof(struct branch_info));
+ if (!bi)
+ return NULL;
+
+ for (i = 0; i < bs->nr; i++) {
+ ip__resolve_ams(self, thr, &bi[i].to, bs->entries[i].to);
+ ip__resolve_ams(self, thr, &bi[i].from, bs->entries[i].from);
+ bi[i].flags = bs->entries[i].flags;
+ }
+ return bi;
+}
+
int machine__resolve_callchain(struct machine *self, struct perf_evsel *evsel,
struct thread *thread,
struct ip_callchain *chain,
@@ -697,6 +754,18 @@
i, sample->callchain->ips[i]);
}
+static void branch_stack__printf(struct perf_sample *sample)
+{
+ uint64_t i;
+
+ printf("... branch stack: nr:%" PRIu64 "\n", sample->branch_stack->nr);
+
+ for (i = 0; i < sample->branch_stack->nr; i++)
+ printf("..... %2"PRIu64": %016" PRIx64 " -> %016" PRIx64 "\n",
+ i, sample->branch_stack->entries[i].from,
+ sample->branch_stack->entries[i].to);
+}
+
static void perf_session__print_tstamp(struct perf_session *session,
union perf_event *event,
struct perf_sample *sample)
@@ -744,6 +813,9 @@
if (session->sample_type & PERF_SAMPLE_CALLCHAIN)
callchain__printf(sample);
+
+ if (session->sample_type & PERF_SAMPLE_BRANCH_STACK)
+ branch_stack__printf(sample);
}
static struct machine *