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Page allocator: get rid of the list of cold pages

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We have repeatedly discussed if the cold pages still have a point. There is
one way to join the two lists: Use a single list and put the cold pages at the
end and the hot pages at the beginning. That way a single list can serve for
both types of allocations.

The discussion of the RFC for this and Mel's measurements indicate that
there may not be too much of a point left to having separate lists for
hot and cold pages (see http://marc.info/?t=119492914200001&r=1&w=2).

Signed-off-by: Christoph Lameter <clameter@sgi.com>
Cc: Mel Gorman <mel@csn.ul.ie>
Cc: Martin Bligh <mbligh@mbligh.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Christoph Lameter 2008-02-04 22:29:19 -08:00 • committed by Linus Torvalds
parent 5dc3318528
commit 3dfa5721f1
3 changed files with 39 additions and 48 deletions
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2
include/linux/mmzone.h
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@ -113,7 +113,7 @@ struct per_cpu_pages {
};
struct per_cpu_pageset {
struct per_cpu_pages pcp[2]; /* 0: hot. 1: cold */
struct per_cpu_pages pcp;
#ifdef CONFIG_NUMA
s8 expire;
#endif