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

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Message-ID: <20090430135005.GA5922@Krystal>
Date:	Thu, 30 Apr 2009 09:50:05 -0400
From:	Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Christoph Lameter <cl@...ux.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	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
Subject: Re: [PATCH] Fix dirty page accounting in
	redirty_page_for_writepage()

* Ingo Molnar (mingo@...e.hu) wrote:
> 
> * Christoph Lameter <cl@...ux.com> wrote:
> 
> > On Wed, 29 Apr 2009, Mathieu Desnoyers wrote:
> > 
> > > to have a good look at the memory accounting code. We could 
> > > probably benefit of Christoph Lameter's cpu ops (using segment 
> > > registers to address per-cpu variables with atomic inc/dec) in 
> > > there. Or at least removing interrupt disabling by using preempt 
> > > disable and local_t variables for the per-cpu counters could 
> > > bring some benefit.
> > 
> > Guess we are ready for atomic per cpu ops now that the new per cpu 
> > allocator is in? Segment register issues with the PDA are also 
> > solved right?
> 
> it's all done, implemented and upstream already. You are a bit late 
> to the party ;-)
> 
> 	Ingo

Or way too early, depending on the point of view. :-)

e.g.
http://lkml.org/lkml/2008/5/30/3

I think Christoph deserves credits for pioneering this area with fresh
ideas.

Mathieu

-- 
Mathieu Desnoyers
OpenPGP key fingerprint: 8CD5 52C3 8E3C 4140 715F  BA06 3F25 A8FE 3BAE 9A68
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