linux-kernel - Re: [PATCH 1/3] perf: add context field to perf

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Message-ID: <20110704143655.GE5551@somewhere>
Date:	Mon, 4 Jul 2011 16:36:57 +0200
From:	Frederic Weisbecker <fweisbec@...il.com>
To:	Avi Kivity <avi@...hat.com>
Cc:	Will Deacon <will.deacon@....com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"kvm@...r.kernel.org" <kvm@...r.kernel.org>,
	Ingo Molnar <mingo@...e.hu>,
	"a.p.zijlstra@...llo.nl" <a.p.zijlstra@...llo.nl>,
	"acme@...stprotocols.net" <acme@...stprotocols.net>,
	Jason Wessel <jason.wessel@...driver.com>
Subject: Re: [PATCH 1/3] perf: add context field to perf_event

On Mon, Jul 04, 2011 at 05:10:20PM +0300, Avi Kivity wrote:
> On 07/04/2011 04:58 PM, Frederic Weisbecker wrote:
> >Another thing I would like to do in the even longer term is to not use perf anymore
> >for ptrace breakpoints, because that involves a heavy dependency and few people are
> >happy with that. Instead we should just have a generic hook into the sched_switch()
> >and handle pure ptrace breakpoints there. The central breakpoint API would still be
> >there to reserve/schedule breakpoint resources between ptrace and perf.
> >
> 
> 'struct preempt_notifier' may be the hook you're looking for.

Yeah looks like a perfect fit as it's per task.

Thanks.
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