linux-kernel - Re: [PATCH 1/1] perf record: We should fork only if a program was specified to run

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Message-ID: <20091218220350.GA21131@elte.hu>
Date:	Fri, 18 Dec 2009 23:03:50 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Arnaldo Carvalho de Melo <acme@...radead.org>,
	linux-kernel@...r.kernel.org,
	Fr?d?ric Weisbecker <fweisbec@...il.com>,
	Mike Galbraith <efault@....de>,
	Paul Mackerras <paulus@...ba.org>
Subject: Re: [PATCH 1/1] perf record: We should fork only if a program was
 specified to run


* Peter Zijlstra <peterz@...radead.org> wrote:

> > Because we want this to work:
> > 
> > [root@...pio linux-2.6-tip]# perf record -a -f sleep 2
> > [ perf record: Woken up 1 times to write data ]
> > [ perf record: Captured and wrote 0.243 MB perf.data (~10599 samples) ]
> > [root@...pio linux-2.6-tip]#
> > 
> > See, no hands mother! I.e. it is system wide, but just for 2 seconds,
> > its clever, but I like it, and it always worked :-)
> 
> Ah, right.. yes, totally forgot about that.

I use the 'perf record -a -f sleep 1' trick all the time to capture a 
system-wide snippet of a particular workload.

	Ingo
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