From: David Ahern <dsahern@gmail.com>
To: Roland Dreier <roland@kernel.org>
Cc: linux-perf-users@vger.kernel.org
Subject: Re: perf for analyzing userspace contention
Date: Fri, 14 Oct 2011 15:25:49 -0600 [thread overview]
Message-ID: <4E98A8DD.6000201@gmail.com> (raw)
In-Reply-To: <CAG4TOxPowPUbmZBL41MNJjPYKymTNFW3JMAgEf35u1k2BFgbwA@mail.gmail.com>
On 10/14/2011 12:36 AM, Roland Dreier wrote:
> Anyway, suppose I have a multithreaded userspace app that uses a bunch of
> pthread_mutexes, and I want to figure out which locks are hot and/or heavily
> contended. What's the best way to do that? Is perf the right, or is there
> something better? (This seems like such an obvious thing to want that there
> must be some good way to get this data, I hope)
You can capture futex entry and exit with:
perf trace -e syscalls:sys_enter_futex -e syscalls:sys_exit_futex
add -g to get the callchains. From there perf-script will dump the events.
David
next prev parent reply other threads:[~2011-10-14 21:25 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-10-14 6:36 perf for analyzing userspace contention Roland Dreier
2011-10-14 6:58 ` Maucci, Cyrille
2011-10-14 7:21 ` Roland Dreier
2011-10-14 7:33 ` Maucci, Cyrille
2011-10-14 9:42 ` Stefan Hajnoczi
2011-10-14 16:58 ` Roland Dreier
2011-10-14 21:25 ` David Ahern [this message]
2011-10-14 22:43 ` Arnaldo Carvalho de Melo
2011-10-17 23:43 ` Arun Sharma
2011-10-18 0:12 ` David Ahern
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