linux-kernel - Re: [PATCH v5 8/8] mm: add vmstat counters for tracking PCP drains

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Date:	Tue, 3 Jan 2012 14:37:54 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Gilad Ben-Yossef <gilad@...yossef.com>
Cc:	KOSAKI Motohiro <kosaki.motohiro@...il.com>,
	linux-kernel@...r.kernel.org, Christoph Lameter <cl@...ux.com>,
	Chris Metcalf <cmetcalf@...era.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Frederic Weisbecker <fweisbec@...il.com>, linux-mm@...ck.org,
	Pekka Enberg <penberg@...nel.org>,
	Matt Mackall <mpm@...enic.com>,
	Sasha Levin <levinsasha928@...il.com>,
	Rik van Riel <riel@...hat.com>,
	Andi Kleen <andi@...stfloor.org>, Mel Gorman <mel@....ul.ie>,
	Alexander Viro <viro@...iv.linux.org.uk>,
	Avi Kivity <avi@...hat.com>
Subject: Re: [PATCH v5 8/8] mm: add vmstat counters for tracking PCP drains

On Tue, 3 Jan 2012 21:00:17 +0200
Gilad Ben-Yossef <gilad@...yossef.com> wrote:

> > NAK.
> >
> > PCP_GLOBAL_IPI_SAVED is only useful at development phase. I can't
> > imagine normal admins use it.
> 
> As the description explains, the purpose of the patch is to show why i
> claim the previous
> patch is useful. I did not meant it to be applied to mainline.

Right.

The thing to do is to use this patch to determine the effectiveness of
the preceding patchset and then present a summary of the results in the
other patch's changelog.  This is precisely what you did and the
results look pretty good.


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