tree a4ac0486af418df0194ed0038b87459652d61945
parent 1e8f889b10d8d2223105719e36ce45688fedbd59
author Christoph Lameter <clameter@engr.sgi.com> 1136535045 -0800
committer Linus Torvalds <torvalds@g5.osdl.org> 1136565203 -0800

[PATCH] mm: dequeue a huge page near to this node

This was discussed at
http://marc.theaimsgroup.com/?l=linux-kernel&m=113166526217117&w=2

This patch changes the dequeueing to select a huge page near the node
executing instead of always beginning to check for free nodes from node 0.
This will result in a placement of the huge pages near the executing
processor improving performance.

The existing implementation can place the huge pages far away from the
executing processor causing significant degradation of performance.  The
search starting from zero also means that the lower zones quickly run out
of memory.  Selecting a huge page near the process distributed the huge
pages better.

Signed-off-by: Christoph Lameter <clameter@sgi.com>
Cc: William Lee Irwin III <wli@holomorphy.com>
Cc: Adam Litke <agl@us.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>