From: Peter Zijlstra <peterz@infradead.org>
To: frank.rowand@am.sony.com
Cc: Chris Mason <chris.mason@oracle.com>, Ingo Molnar <mingo@elte.hu>,
"axboe@kernel.dk" <axboe@kernel.dk>,
"linux-kernel@vger.kernel.org" <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: Thu, 02 Dec 2010 08:36:49 +0100 [thread overview]
Message-ID: <1291275409.4023.21.camel@twins> (raw)
In-Reply-To: <4CF6D694.4030003@am.sony.com>
On Wed, 2010-12-01 at 15:13 -0800, Frank Rowand wrote:
>
> If the task to be woken is on a run queue on a different cpu then use
> cmpxchg() to put it onto a pending try_to_wake_up list on the different
> cpu. Then send an interrupt to the different cpu to cause that cpu to
> call try_to_wake_up() for each process on the try_to_wake_up list.
Without having looked at the actual code, the described thing cannot
work, try_to_wake_up() has a return value that needs to be passed back.
Also, try_to_wake_up() does load-balancing, you really want to do that
before queueing it on a remote cpu.
next prev parent reply other threads:[~2010-12-02 7:37 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
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 [this message]
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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