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Subject[PATCH] perf: Add branch stack support to perf script (v2)
Date
This makes it easier to write tools that consume the
branch stack data.

Sample usage:

perf record -jany_call,u -o perf.data.anycallu -- ./foo
perf script -i perf.data.anycallu -fip,sym

Signed-off-by: Arun Sharma <asharma@fb.com>
Cc: Stephane Eranian <eranian@google.com>
Cc: peterz@infradead.org
Cc: acme@redhat.com
Cc: ravitillo@lbl.gov
Cc: vweaver1@eecs.utk.edu
Cc: khandual@linux.vnet.ibm.com
Cc: dsahern@gmail.com
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Namhyung Kim <namhyung.kim@lge.com>
---
tools/perf/builtin-script.c | 56 ++++++++++++++++++++++++++++++++++++++----
1 files changed, 50 insertions(+), 6 deletions(-)

diff --git a/tools/perf/builtin-script.c b/tools/perf/builtin-script.c
index d4ce733..f71c54c 100644
--- a/tools/perf/builtin-script.c
+++ b/tools/perf/builtin-script.c
@@ -318,6 +318,11 @@ static bool is_bts_event(struct perf_event_attr *attr)
(attr->sample_period == 1));
}

+static bool is_branch_stack_event(struct perf_event_attr *attr)
+{
+ return (attr->sample_type & PERF_SAMPLE_BRANCH_STACK);
+}
+
static bool sample_addr_correlates_sym(struct perf_event_attr *attr)
{
if ((attr->type == PERF_TYPE_SOFTWARE) &&
@@ -326,31 +331,32 @@ static bool sample_addr_correlates_sym(struct perf_event_attr *attr)
(attr->config == PERF_COUNT_SW_PAGE_FAULTS_MAJ)))
return true;

- if (is_bts_event(attr))
+ if (is_bts_event(attr) || is_branch_stack_event(attr))
return true;

return false;
}

-static void print_sample_addr(union perf_event *event,
+static void __print_sample_addr(union perf_event *event,
struct perf_sample *sample,
struct machine *machine,
struct thread *thread,
- struct perf_event_attr *attr)
+ struct perf_event_attr *attr,
+ u64 addr)
{
struct addr_location al;
u8 cpumode = event->header.misc & PERF_RECORD_MISC_CPUMODE_MASK;

- printf("%16" PRIx64, sample->addr);
+ printf("%16" PRIx64, addr);

if (!sample_addr_correlates_sym(attr))
return;

thread__find_addr_map(thread, machine, cpumode, MAP__FUNCTION,
- sample->addr, &al);
+ addr, &al);
if (!al.map)
thread__find_addr_map(thread, machine, cpumode, MAP__VARIABLE,
- sample->addr, &al);
+ addr, &al);

al.cpu = sample->cpu;
al.sym = NULL;
@@ -373,6 +379,17 @@ static void print_sample_addr(union perf_event *event,
}
}

+static void print_sample_addr(union perf_event *event,
+ struct perf_sample *sample,
+ struct machine *machine,
+ struct thread *thread,
+ struct perf_event_attr *attr)
+
+{
+ return __print_sample_addr(event, sample, machine, thread, attr,
+ sample->addr);
+}
+
static void print_sample_bts(union perf_event *event,
struct perf_sample *sample,
struct perf_evsel *evsel,
@@ -401,6 +418,28 @@ static void print_sample_bts(union perf_event *event,
printf("\n");
}

+static void print_sample_branch_stack(union perf_event *event,
+ struct perf_sample *sample,
+ struct perf_evsel *evsel,
+ struct machine *machine,
+ struct thread *thread)
+{
+ uint64_t i;
+ struct perf_event_attr *attr = &evsel->attr;
+
+ printf("... branch stack: nr:%" PRIu64 "\n", sample->branch_stack->nr);
+
+ for (i = 0; i < sample->branch_stack->nr; i++) {
+ printf("\t..... %2"PRIu64": ", i);
+ __print_sample_addr(event, sample, machine, thread, attr,
+ sample->branch_stack->entries[i].from);
+ printf(" => ");
+ __print_sample_addr(event, sample, machine, thread, attr,
+ sample->branch_stack->entries[i].to);
+ printf("\n");
+ }
+}
+
static void process_event(union perf_event *event __unused,
struct perf_sample *sample,
struct perf_evsel *evsel,
@@ -417,6 +456,11 @@ static void process_event(union perf_event *event __unused,
if (is_bts_event(attr)) {
print_sample_bts(event, sample, evsel, machine, thread);
return;
+ }
+
+ if (is_branch_stack_event(attr)) {
+ print_sample_branch_stack(event, sample, evsel, machine, thread);
+ return;
}

if (PRINT_FIELD(TRACE))
--
1.7.8.4


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