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

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Message-ID: <20110712094822.GB29812@8bytes.org>
Date:	Tue, 12 Jul 2011 11:48:22 +0200
From:	Joerg Roedel <joro@...tes.org>
To:	Avi Kivity <avi@...hat.com>
Cc:	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	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 Tue, Jul 12, 2011 at 12:44:17PM +0300, Avi Kivity wrote:
> On 07/12/2011 12:41 PM, Joerg Roedel wrote:
>> >  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.
>>
>> I would rather vote for Avi's solution too. Such a functionality is very
>> helpful for LWP-perf integration as well (because we need a way to call
>> do_mmap for a task != current).
>>
>
> It's not needed for that.  See use_mm() (caller must be a kernel thread).

But in our case the caller would be the process that wants to count, not
a kernel thread.

	Joerg

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