From: Peter Zijlstra <peterz@infradead.org>
To: Chris Mason <chris.mason@oracle.com>
Cc: Ingo Molnar <mingo@elte.hu>,
axboe@kernel.dk, linux-kernel@vger.kernel.org,
Mike Galbraith <efault@gmx.de>, Oleg Nesterov <oleg@redhat.com>,
tglx <tglx@linutronix.de>
Subject: Re: [PATCH RFC] reduce runqueue lock contention
Date: Mon, 21 Jun 2010 15:04:39 +0200 [thread overview]
Message-ID: <1277125479.1875.510.camel@laptop> (raw)
In-Reply-To: <1277117647.1875.503.camel@laptop>
On Mon, 2010-06-21 at 12:54 +0200, Peter Zijlstra wrote:
> > It looses the ttwu task_running() check, as I must admit I'm not quite
> > sure what it does.. Ingo?
I think I figured out what its for, its for when p is prev in schedule()
after deactivate_task(), we have to call activate_task() it again, but
we cannot migrate the task because the CPU its on is still referencing
it.
I added it back, but still fireworks :-)
next prev parent reply other threads:[~2010-06-21 13:04 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-05-20 20:48 [PATCH RFC] reduce runqueue lock contention Chris Mason
2010-05-20 21:09 ` Peter Zijlstra
2010-05-20 21:23 ` Peter Zijlstra
2010-05-20 22:17 ` Chris Mason
2010-05-20 22:21 ` Chris Mason
2010-06-04 10:56 ` Stijn Devriendt
2010-06-04 12:00 ` Peter Zijlstra
2010-06-05 9:37 ` Stijn Devriendt
2010-06-21 10:02 ` Peter Zijlstra
2010-06-21 10:54 ` Peter Zijlstra
2010-06-21 13:04 ` Peter Zijlstra [this message]
2010-06-22 13:33 ` Peter Zijlstra
2010-06-22 21:11 ` Ingo Molnar
2010-06-23 9:10 ` Peter Zijlstra
2010-12-01 23:13 ` Frank Rowand
2010-12-02 1:17 ` Frank Rowand
2010-12-02 7:36 ` Peter Zijlstra
2010-12-14 2:41 ` Frank Rowand
2010-12-14 3:42 ` Mike Galbraith
2010-12-14 21:42 ` Frank Rowand
2010-12-15 18:59 ` Oleg Nesterov
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