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

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Date:	Wed,  5 Nov 2008 18:55:53 +0900 (JST)
From:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	kosaki.motohiro@...fujitsu.com,
	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().

yup.
Now, I testing "simple dropping lru_add_drain_all() in mlock path" patch.

Thanks.


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