From: Ingo Molnar <mingo@elte.hu>
To: Peter Zijlstra <peterz@infradead.org>
Cc: Arnaldo Carvalho de Melo <acme@infradead.org>,
linux-kernel@vger.kernel.org,
Fr?d?ric Weisbecker <fweisbec@gmail.com>,
Mike Galbraith <efault@gmx.de>, Paul Mackerras <paulus@samba.org>
Subject: Re: [PATCH 1/1] perf record: We should fork only if a program was specified to run
Date: Fri, 18 Dec 2009 23:03:50 +0100 [thread overview]
Message-ID: <20091218220350.GA21131@elte.hu> (raw)
In-Reply-To: <1261170818.20899.657.camel@laptop>
* Peter Zijlstra <peterz@infradead.org> wrote:
> > Because we want this to work:
> >
> > [root@doppio 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@doppio 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
next prev parent reply other threads:[~2009-12-18 22:04 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-12-18 20:42 [PATCH 1/1] perf record: We should fork only if a program was specified to run Arnaldo Carvalho de Melo
2009-12-18 20:52 ` Peter Zijlstra
2009-12-18 20:58 ` Arnaldo Carvalho de Melo
2009-12-18 21:13 ` Peter Zijlstra
2009-12-18 22:03 ` Ingo Molnar [this message]
2009-12-18 21:29 ` Peter Zijlstra
2009-12-20 10:31 ` Xiao Guangrong
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