linux-kernel - Re: [RFC PATCHSET] sched,perf: unify tracers in sched and move perf on top of TP

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Message-ID: <4BE26B96.4040007@kernel.org>
Date:	Thu, 06 May 2010 09:11:18 +0200
From:	Tejun Heo <tj@...nel.org>
To:	Ingo Molnar <mingo@...e.hu>
CC:	Frederic Weisbecker <fweisbec@...il.com>,
	Peter Zijlstra <peterz@...radead.org>, efault@....de,
	avi@...hat.com, paulus@...ba.org, acme@...hat.com,
	linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCHSET] sched,perf: unify tracers in sched and move perf
 on top of TP

Hello,

On 05/06/2010 08:28 AM, Ingo Molnar wrote:
> ( They are also under intense optimization - the jump-tracepoints patch makes 
>   them probably even cheaper than preempt notifiers, in the off case. )

I mostly agree on other points but TPs and sched_notifiers are
inherently different in how they are enabled/disabled.
sched_notifiers are enabled/disabled per-task and at least w/ cmwq,
there will always be some tasks with active sched_notifiers so code
level optimizations aren't really useful.

Thanks.

-- 
tejun
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