From: Peter Zijlstra <peterz@infradead.org>
To: Andrew Vagin <avagin@openvz.org>
Cc: linux-kernel@vger.kernel.org, Ingo Molnar <mingo@kernel.org>,
Thomas Gleixner <tglx@linutronix.de>,
Steven Rostedt <rostedt@goodmis.org>,
Arun Sharma <asharma@fb.com>
Subject: Re: [PATCH] sched: deliver sched_switch events to a current task
Date: Thu, 12 Jul 2012 15:56:01 +0200 [thread overview]
Message-ID: <1342101361.28010.0.camel@twins> (raw)
In-Reply-To: <1342088069-1005148-1-git-send-email-avagin@openvz.org>
On Thu, 2012-07-12 at 14:14 +0400, Andrew Vagin wrote:
> Otherwise they can't be filtered for a defined task.
>
> perf record -e sched:sched_switch ./foo
>
> This command doesn't report any event without this patch.
>
> I think it isn't a big problem for security, if someone will know
> who will be executed next. By default perf is disabled for non-root
> users.
>
> I need this events for profiling sleep times. sched_switch is used for
> getting callchains and sched_stat_* is used for getting time periods.
> This events are combined in user space, then it can be analized by
> perf tools.
Thanks!
next prev parent reply other threads:[~2012-07-12 13:56 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-07-12 10:14 Andrew Vagin
2012-07-12 13:56 ` Peter Zijlstra [this message]
2012-07-26 15:10 ` [tip:perf/core] sched: Deliver sched_switch events to the " tip-bot for Andrew Vagin
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