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

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Date:	Tue, 12 Jul 2011 12:36:05 +0300
From:	Avi Kivity <avi@...hat.com>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
CC:	Will Deacon <will.deacon@....com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"kvm@...r.kernel.org" <kvm@...r.kernel.org>,
	Ingo Molnar <mingo@...e.hu>,
	"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 07/12/2011 12:31 PM, Peter Zijlstra wrote:
> >
> >  But it means that 'current' is not set to the right value.  If the
> >  function depends on it, then it will misbehave.  And in fact
> >  preempt_notifier_register(), which is the function we want to call here,
> >  does depend on current.
> >
> >  Of course we need to find more users for this, but I have a feeling this
> >  will be generally useful.  The alternative is to keep adding bits to
> >  thread_info::flags.
>
> Using TIF_bits sounds like a much better solution for this, wakeups are
> really rather expensive and its best to avoid extra if at all possible.
>

We do need a way to make the task look at them.

-- 
I have a truly marvellous patch that fixes the bug which this
signature is too narrow to contain.

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