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perf tools: Add code to support PERF_SAMPLE_BRANCH_STACK

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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>
This commit is contained in:
Roberto Agostino Vitillo 2012-02-09 23:21:01 +01:00 • committed by Ingo Molnar
parent d010b3326c
commit b5387528f3
10 changed files with 470 additions and 80 deletions
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72
tools/perf/util/session.c
View file

@ -229,6 +229,63 @@ static bool symbol__match_parent_regex(struct symbol *sym)
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 @@ static void callchain__printf(struct perf_sample *sample)
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 @@ static void dump_sample(struct perf_session *session, union perf_event *event,
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 *