linux-kernel - Re: [PATCH 0/5] perf kmem: Add more functions and show more statistics

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Date:	Tue, 24 Nov 2009 11:07:24 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Li Zefan <lizf@...fujitsu.com>
Cc:	Pekka Enberg <penberg@...helsinki.fi>,
	Eduard - Gabriel Munteanu <eduard.munteanu@...ux360.ro>,
	Peter Zijlstra <peterz@...radead.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	LKML <linux-kernel@...r.kernel.org>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>
Subject: Re: [PATCH 0/5] perf kmem: Add more functions and show more
 statistics


* Li Zefan <lizf@...fujitsu.com> wrote:

> > 3)
> > 
> > it doesnt seem to be working on one of my boxes, which has perf and kmem 
> > events as well:
> > 
> > aldebaran:~/linux/linux/tools/perf> perf kmem record
> > ^C[ perf record: Woken up 1 times to write data ]
> > [ perf record: Captured and wrote 0.050 MB perf.data (~2172 samples) ]
> > 
> 
> Seems no kmem event is recorded. No sure what happened here.
> 
> Might be that the parameters that perf-kmem passes to perf-record
> are not properly selected?
> 
> Do perf-sched and perf-timechart work on this box?

yeah:

aldebaran:~> perf sched record sleep 1
[ perf record: Woken up 1 times to write data ]
[ perf record: Captured and wrote 0.017 MB perf.data (~758 samples) ]
aldebaran:~> perf trace | tail -5
         distccd-20944 [010]  1792.787376: sched_stat_runtime: comm=distccd pid=20944 runtime=11196 [ns] vruntime=696395420043 [ns]
            init-0     [009]  1792.914837: sched_stat_wait: comm=x86_64-linux-gc pid=881 delay=10686 [ns]
            init-0     [009]  1792.915082: sched_stat_sleep: comm=events/9 pid=44 delay=2183651362 [ns]
              as-889   [013]  1793.008008: sched_stat_runtime: comm=as pid=889 runtime=156807 [ns] vruntime=1553569219042 [ns]
            init-0     [004]  1793.154400: sched_stat_wait: comm=events/4 pid=39 delay=12155 [ns]

aldebaran:~> perf kmem record sleep 1
[ perf record: Woken up 1 times to write data ]
[ perf record: Captured and wrote 0.078 MB perf.data (~3398 samples) ]
aldebaran:~> perf trace | tail -5
aldebaran:~> 

the perf.data has mmap and exit events - but no kmem events.

I've attached the config, in case it matters. It runs latest -tip, with 
your latest series applied as well.

	Ingo

View attachment "config" of type "text/plain" (67550 bytes)