linux-kernel - Re: [RFC][PATCH] lru_add_drain_all() don't use schedule_on_each

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Date:	Wed, 05 Nov 2008 10:51:44 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Christoph Lameter <cl@...ux-foundation.org>,
	heiko.carstens@...ibm.com, npiggin@...e.de,
	linux-kernel@...r.kernel.org, hugh@...itas.com,
	torvalds@...ux-foundation.org, riel@...hat.com,
	lee.schermerhorn@...com, linux-mm@...ck.org
Subject: Re: [RFC][PATCH] lru_add_drain_all() don't use
 schedule_on_each_cpu()

On Wed, 2008-10-29 at 16:20 +0900, KOSAKI Motohiro wrote:
> > I guess we should document our newly discovered schedule_on_each_cpu()
> > problems before we forget about it and later rediscover it.
> 
> Now, schedule_on_each_cpu() is only used by lru_add_drain_all().
> and smp_call_function() is better way for cross call.
> 
> So I propose
>    1. lru_add_drain_all() use smp_call_function()
>    2. remove schedule_on_each_cpu()
> 
> 
> Thought?

At the very least that will not solve the problem on -rt where a lot of
the smp_call_function() users are converted to schedule_on_each_cpu().


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