Page allocator: get rid of the list of cold pages

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>

1 files changed, 1 insertions, 1 deletions

diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h
index 4c4522a51a3b..8d8d1977736e 100644
--- a/include/linux/mmzone.h
+++ b/include/linux/mmzone.h
@@ -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