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From: Arnaldo Carvalho de Melo on 2 Jun 2010 16:50
From: Stephane Eranian <eranian(a)google.com>

It is useful to know on which CPU a sample was captured on.
The information is captured with perf record -R but it was
not printed out by perf report -D. This patch adds this.

When -R is not used, cpu is set to -1to indicate that
the CPU is unknown (it is not captured).

Cc: David S. Miller <davem(a)davemloft.net>
Cc: Frédéric Weisbecker <fweisbec(a)gmail.com>
Cc: Ingo Molnar <mingo(a)elte.hu>
Cc: Paul Mackerras <paulus(a)samba.org>
Cc: Peter Zijlstra <peterz(a)infradead.org>
Cc: Tom Zanussi <tzanussi(a)gmail.com>
LKML-Reference: <4bff964c.e88cd80a.3106.7d31(a)mx.google.com>
Signed-off-by: Stephane Eranian <eranian(a)google.com>
Signed-off-by: Arnaldo Carvalho de Melo <acme(a)redhat.com>
---
tools/perf/builtin-report.c | 5 +++--
tools/perf/util/event.c | 3 ++-
2 files changed, 5 insertions(+), 3 deletions(-)

diff --git a/tools/perf/builtin-report.c b/tools/perf/builtin-report.c
index 3592057..207da18 100644
--- a/tools/perf/builtin-report.c
+++ b/tools/perf/builtin-report.c
@@ -157,8 +157,9 @@ static int process_sample_event(event_t *event, struct perf_session *session)

event__parse_sample(event, session->sample_type, &data);

- dump_printf("(IP, %d): %d/%d: %#Lx period: %Ld\n", event->header.misc,
- data.pid, data.tid, data.ip, data.period);
+ dump_printf("(IP, %d): %d/%d: %#Lx period: %Ld cpu:%d\n",
+ event->header.misc, data.pid, data.tid, data.ip,
+ data.period, data.cpu);

if (session->sample_type & PERF_SAMPLE_CALLCHAIN) {
unsigned int i;
diff --git a/tools/perf/util/event.c b/tools/perf/util/event.c
index 50771b5..58cb96b 100644
--- a/tools/perf/util/event.c
+++ b/tools/perf/util/event.c
@@ -770,7 +770,8 @@ int event__parse_sample(event_t *event, u64 type, struct sample_data *data)
u32 *p = (u32 *)array;
data->cpu = *p;
array++;
- }
+ } else
+ data->cpu = -1;

if (type & PERF_SAMPLE_PERIOD) {
data->period = *array;
--
1.6.2.5

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Prev: How to tell kernel that a region of memory is reserved (in middle of ram)?
Next: virtio: put last seen used index into ring itself