linux-kernel - Re: [PATCH 1/4 tip/sched/core] sched: rename preempt_notifier to sched

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Message-ID: <4B0E5C06.8080500@kernel.org>
Date:	Thu, 26 Nov 2009 19:44:22 +0900
From:	Tejun Heo <tj@...nel.org>
To:	Ingo Molnar <mingo@...e.hu>
CC:	Stephen Rothwell <sfr@...b.auug.org.au>,
	linux-next@...r.kernel.org, linux-kernel@...r.kernel.org,
	Mike Galbraith <efault@....de>,
	Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>,
	Peter Zijlstra <peterz@...radead.org>
Subject: Re: [PATCH 1/4 tip/sched/core] sched: rename preempt_notifier to
 sched_notifier and always enable it

Hello, Ingo.

11/26/2009 07:29 PM, Ingo Molnar wrote:
> That could be done with just two callbacks - one for sched-out, one for 
> sched-in.
> 
> The best way to do that would be to use two TRACE_EVENT() callbacks, 
> make them unconditional and register to them. (with wrappers to make it 
> all convenient to use)
> 
> This requires some work but needs to be done.

Thought about that but trace events and scheduler callbacks have very
different trigger enable/disable conditions.  I couldn't think of a
way to do both in reasonably efficient manner.  Although they both are
notification mechanisms, they do have pretty different requirements
and I'm not quite sure whether unifying them is a good idea.  Of
course if you have an idea to do both efficiently, no reason not to do
it.

Thanks.

-- 
tejun
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