linux-kernel - Re: [PATCH] Fix dirty page accounting in redirty_page_for

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Message-ID: <20090501195941.GA28264@elte.hu>
Date:	Fri, 1 May 2009 21:59:41 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Christoph Lameter <cl@...ux.com>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Nick Piggin <nickpiggin@...oo.com.au>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>, thomas.pi@...or.dea,
	Yuriy Lalym <ylalym@...il.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	ltt-dev@...ts.casi.polymtl.ca, Tejun Heo <tj@...nel.org>
Subject: Re: [PATCH] Fix dirty page accounting in
	redirty_page_for_writepage()


* Christoph Lameter <cl@...ux.com> wrote:

> On Thu, 30 Apr 2009, Ingo Molnar wrote:
> 
> > So we introduced preemption-safety in the v2 version of that commit.
> >
> > This non-atomicity will 1) either not matter 2) will be 
> > irq-atomic by virtue of being within a critical section 3) can 
> > be made atomic in the few remaining cases.
> >
> > And maybe, at most, introduce an opt-in API: 
> > percpu_add_irqsafe().
> 
> Plus percpu_add_preemptsafe().

Ok - that would be easy. Would you be interested in doing that and 
would you be interested in resurrecting your old patches? They are 
genuinely useful IMHO.

	Ingo
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