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Date: Wed, 2 Sep 2009 23:54:56 +0200
From: Ingo Molnar <mingo@...e.hu>
To: Frederic Weisbecker <fweisbec@...il.com>
Cc: mingo@...hat.com, hpa@...or.com, paulus@...ba.org, acme@...hat.com,
linux-kernel@...r.kernel.org, a.p.zijlstra@...llo.nl,
lizf@...fujitsu.com, efault@....de, tglx@...utronix.de,
linux-tip-commits@...r.kernel.org
Subject: Re: [tip:perfcounters/core] perf trace: Sample the CPU too
* Frederic Weisbecker <fweisbec@...il.com> wrote:
> On Wed, Sep 02, 2009 at 07:31:51PM +0000, tip-bot for Ingo Molnar wrote:
> > Commit-ID: cd6feeeafddbef6abfe4d90fb26e42fd844d34ed
> > Gitweb: http://git.kernel.org/tip/cd6feeeafddbef6abfe4d90fb26e42fd844d34ed
> > Author: Ingo Molnar <mingo@...e.hu>
> > AuthorDate: Wed, 2 Sep 2009 20:20:38 +0200
> > Committer: Ingo Molnar <mingo@...e.hu>
> > CommitDate: Wed, 2 Sep 2009 21:28:50 +0200
> >
> > perf trace: Sample the CPU too
> >
> > Sample, record, parse and print the CPU field - it had all zeroes before.
> >
> > Before (watch the second column, the CPU values):
> >
> > perf-32685 [000] 0.000000: sched_wakeup_new: task perf:32686 [120] success=1 [011]
> > perf-32685 [000] 0.000000: sched_migrate_task: task perf:32685 [120] from: 1 to: 11
> > perf-32685 [000] 0.000000: sched_process_fork: parent perf:32685 child perf:32686
> > true-32686 [000] 0.000000: sched_wakeup: task migration/11:25 [0] success=1 [011]
> > true-32686 [000] 0.000000: sched_wakeup: task distccd:12793 [125] success=1 [015]
> > true-32686 [000] 0.000000: sched_wakeup: task distccd:12793 [125] success=1 [015]
> > perf-32685 [000] 0.000000: sched_switch: task perf:32685 [120] (S) ==> swapper:0 [140]
> > true-32686 [000] 0.000000: sched_switch: task perf:32686 [120] (R) ==> migration/11:25 [0]
> > true-32686 [000] 0.000000: sched_switch: task perf:32686 [120] (R) ==> distccd:12793 [125]
> > true-32686 [000] 0.000000: sched_switch: task true:32686 [120] (R) ==> distccd:12793 [125]
> > true-32686 [000] 0.000000: sched_process_exit: task true:32686 [120]
> > true-32686 [000] 0.000000: sched_stat_wait: task: distccd:12793 wait: 6767985949080 [ns]
> > true-32686 [000] 0.000000: sched_stat_wait: task: distccd:12793 wait: 6767986139446 [ns]
> > true-32686 [000] 0.000000: sched_stat_sleep: task: distccd:12793 sleep: 132844 [ns]
> > true-32686 [000] 0.000000: sched_stat_sleep: task: distccd:12793 sleep: 131724 [ns]
> >
> > After:
> >
> > perf-32685 [001] 0.000000: sched_wakeup_new: task perf:32686 [120] success=1 [011]
> > perf-32685 [001] 0.000000: sched_migrate_task: task perf:32685 [120] from: 1 to: 11
> > perf-32685 [001] 0.000000: sched_process_fork: parent perf:32685 child perf:32686
> > true-32686 [011] 0.000000: sched_wakeup: task migration/11:25 [0] success=1 [011]
> > true-32686 [015] 0.000000: sched_wakeup: task distccd:12793 [125] success=1 [015]
> > true-32686 [015] 0.000000: sched_wakeup: task distccd:12793 [125] success=1 [015]
> > perf-32685 [001] 0.000000: sched_switch: task perf:32685 [120] (S) ==> swapper:0 [140]
> > true-32686 [011] 0.000000: sched_switch: task perf:32686 [120] (R) ==> migration/11:25 [0]
> > true-32686 [015] 0.000000: sched_switch: task perf:32686 [120] (R) ==> distccd:12793 [125]
> > true-32686 [015] 0.000000: sched_switch: task true:32686 [120] (R) ==> distccd:12793 [125]
> > true-32686 [015] 0.000000: sched_process_exit: task true:32686 [120]
> > true-32686 [015] 0.000000: sched_stat_wait: task: distccd:12793 wait: 6767985949080 [ns]
> > true-32686 [015] 0.000000: sched_stat_wait: task: distccd:12793 wait: 6767986139446 [ns]
> > true-32686 [015] 0.000000: sched_stat_sleep: task: distccd:12793 sleep: 132844 [ns]
> > true-32686 [015] 0.000000: sched_stat_sleep: task: distccd:12793 sleep: 131724 [ns]
> >
> > So we can now see how this workload migrated between CPUs.
> >
> > Cc: Peter Zijlstra <a.p.zijlstra@...llo.nl>
> > Cc: Paul Mackerras <paulus@...ba.org>
> > Cc: Frederic Weisbecker <fweisbec@...il.com>
> > Cc: Li Zefan <lizf@...fujitsu.com>
> > Cc: Mike Galbraith <efault@....de>
> > Cc: Arnaldo Carvalho de Melo <acme@...hat.com>
> > LKML-Reference: <new-submission>
> > Signed-off-by: Ingo Molnar <mingo@...e.hu>
> >
> >
> > ---
> > tools/perf/builtin-record.c | 4 +++-
> > tools/perf/builtin-trace.c | 9 ++++++++-
> > 2 files changed, 11 insertions(+), 2 deletions(-)
> >
> > diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c
> > index add514d..ff93f8e 100644
> > --- a/tools/perf/builtin-record.c
> > +++ b/tools/perf/builtin-record.c
> > @@ -403,8 +403,10 @@ static void create_counter(int counter, int cpu, pid_t pid)
> > if (call_graph)
> > attr->sample_type |= PERF_SAMPLE_CALLCHAIN;
> >
> > - if (raw_samples)
> > + if (raw_samples) {
> > attr->sample_type |= PERF_SAMPLE_RAW;
> > + attr->sample_type |= PERF_SAMPLE_CPU;
> > + }
> >
> > attr->mmap = track;
> > attr->comm = track;
> > diff --git a/tools/perf/builtin-trace.c b/tools/perf/builtin-trace.c
> > index 8247fd0..bbe4c44 100644
> > --- a/tools/perf/builtin-trace.c
> > +++ b/tools/perf/builtin-trace.c
> > @@ -58,12 +58,19 @@ process_sample_event(event_t *event, unsigned long offset, unsigned long head)
> > struct dso *dso = NULL;
> > struct thread *thread;
> > u64 ip = event->ip.ip;
> > + u32 cpu = -1;
> > u64 period = 1;
> > void *more_data = event->ip.__more_data;
> > int cpumode;
> >
> > thread = threads__findnew(event->ip.pid, &threads, &last_match);
> >
> > + if (sample_type & PERF_SAMPLE_CPU) {
> > + cpu = *(u32 *)more_data;
> > + more_data += sizeof(u32);
> > + more_data += sizeof(u32); /* reserved */
> > + }
> > +
>
>
> Cool, I've searched an easy way to have the cpu and I wasn't even
> aware of this type of event :-)
>
>
> What about the timestamp now? I guess a specific field should be
> filled for tracepoint raw samples. Or may be for every raw
> samples?
how about:
* { u64 time; } && PERF_SAMPLE_TIME
?
Here's the full list of sample options btw:
/*
* struct {
* struct perf_event_header header;
*
* { u64 ip; } && PERF_SAMPLE_IP
* { u32 pid, tid; } && PERF_SAMPLE_TID
* { u64 time; } && PERF_SAMPLE_TIME
* { u64 addr; } && PERF_SAMPLE_ADDR
* { u64 id; } && PERF_SAMPLE_ID
* { u64 stream_id;} && PERF_SAMPLE_STREAM_ID
* { u32 cpu, res; } && PERF_SAMPLE_CPU
* { u64 period; } && PERF_SAMPLE_PERIOD
*
* { struct read_format values; } && PERF_SAMPLE_READ
*
* { u64 nr,
* u64 ips[nr]; } && PERF_SAMPLE_CALLCHAIN
*
Ingo
--
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