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

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Message-ID: <4BE27B6F.2030806@redhat.com>
Date:	Thu, 06 May 2010 11:18:55 +0300
From:	Avi Kivity <avi@...hat.com>
To:	Ingo Molnar <mingo@...e.hu>
CC:	Frederic Weisbecker <fweisbec@...il.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Tejun Heo <tj@...nel.org>, efault@....de, 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

On 05/06/2010 09:28 AM, Ingo Molnar wrote:
>
> Yep. Also, most of the default distro kernels will have 3 sets of facilities:
>
>   - preempt notifiers
>   - tracepoints
>   - sw events
>
> which is crazy. We can just standardize on using the tracepoint interface
> definition methods - they are properly typed, widespread and well-known enough
> to be perfect for this.
>
> ( They are also under intense optimization - the jump-tracepoints patch makes
>    them probably even cheaper than preempt notifiers, in the off case. )
>
>    

What about the on case?  kvm has preempt notifiers enabled all the time, 
and relies on their being fast.

-- 
error compiling committee.c: too many arguments to function

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