linux-kernel - [PATCH 0/1] pagemap clear_refs: modify to specify anon or mapped vma clearing

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Date:	Thu, 23 Jul 2009 20:56:37 -0700
From:	"Moussa A. Ba" <moussa.a.ba@...il.com>
To:	linux-kernel@...r.kernel.org
CC:	akpm@...ux-foundation.org, adobriyan@...il.com, mpm@...enic.com,
	mel@....ul.ie, yinghan@...gle.com, npiggin@...e.de,
	jaredeh@...il.com, moussa.a.ba@...il.com
Subject: [PATCH 0/1] pagemap clear_refs: modify to specify anon or mapped
 vma clearing

This patch makes the clear_refs proc interface a bit more versatile. It 
adds support for clearing either anonymous, file mapped pages or both.

echo 1 > /proc/pid/clear_refs clears ANON pages
echo 2 > /proc/pid/clear_refs clears file mapped pages
echo 3 > /proc/pid/clear_refs clears all pages

Selectively clearing pages has a measurable impact on performance as it 
decreases the number of page walks.  We have been using this interface 
and this adds flexibility to the user space application implementing the 
reference clearing.

Moussa.
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