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Date: Sat, 08 May 2010 17:02:24 +0900 From: Hitoshi Mitake <mitake@....info.waseda.ac.jp> To: Frederic Weisbecker <fweisbec@...il.com> CC: linux-kernel@...r.kernel.org, h.mitake@...il.com, Ingo Molnar <mingo@...e.hu>, Peter Zijlstra <a.p.zijlstra@...llo.nl>, Paul Mackerras <paulus@...ba.org>, Arnaldo Carvalho de Melo <acme@...hat.com>, Jens Axboe <jens.axboe@...cle.com>, Jason Baron <jbaron@...hat.com>, Xiao Guangrong <xiaoguangrong@...fujitsu.com> Subject: Re: [PATCH] perf lock: track only specified threads On 05/07/10 09:49, Frederic Weisbecker wrote: > On Thu, May 06, 2010 at 06:32:56PM +0900, Hitoshi Mitake wrote: >> I implemented the feature of tracking only specified threads to perf lock. >> With -t option, users can specify which threads should be tracked. >> >> Example of usage: >> | % sudo ./perf lock info -t # info -t is convenient with this feature >> | Thread ID: comm >> | 0: swapper >> | 1: init >> | 12: migration/3 >> | 13: ksoftirqd/3 >> | 27: events/0 >> | 28: events/1 >> | 29: events/2 >> | 30: events/3 >> | 31: events/4 >> | 857: kondemand/0 >> | 858: kondemand/1 >> | 859: kondemand/2 >> | ... >> | % sudo ./perf lock -t 27,28,29,30,31 report # track only these threads >> | Name acquired contended total wait (ns) max wait (ns) min wait (ns) > > > > I'm not sure we want such per thread granularity filtering. I'm not > sure it will be very useful. But per process yeah. > > And actually we should do that on tracing time rather than on post-processing. > This will lower the tracing overhead a lot. > > Ideally I think we need: > ./perf lock record ls -R / > > This would trace locks taken by this instance of ls only, ie: drop the -a > if we pass a command line. > > What do you think? > > Ah, I completely agree with your opinion :) Even if user wants to append "-a", ./perf lock record -a ls -R / is enough. "-a" should not in default set of arguments. I'll send the patch to drop "-a" later. Thanks, Hitoshi -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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