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author | Anton Blanchard <anton@samba.org> | 2010-05-16 20:19:56 (GMT) |
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committer | Benjamin Herrenschmidt <benh@kernel.crashing.org> | 2010-05-21 07:31:12 (GMT) |
commit | 56608209d34b8add40af54031d4e420afbcde9f6 (patch) | |
tree | 6aa984dc088df39b426f6320f3cbd09c26e5e72e /arch/powerpc/mm/numa.c | |
parent | b878dc00595440586874952dd85ce9b803360b87 (diff) | |
download | linux-fsl-qoriq-56608209d34b8add40af54031d4e420afbcde9f6.tar.xz |
powerpc/numa: Set a smaller value for RECLAIM_DISTANCE to enable zone reclaim
I noticed /proc/sys/vm/zone_reclaim_mode was 0 on a ppc64 NUMA box. It gets
enabled via this:
/*
* If another node is sufficiently far away then it is better
* to reclaim pages in a zone before going off node.
*/
if (distance > RECLAIM_DISTANCE)
zone_reclaim_mode = 1;
Since we use the default value of 20 for REMOTE_DISTANCE and 20 for
RECLAIM_DISTANCE it never kicks in.
The local to remote bandwidth ratios can be quite large on System p
machines so it makes sense for us to reclaim clean pagecache locally before
going off node.
The patch below sets a smaller value for RECLAIM_DISTANCE and thus enables
zone reclaim.
Signed-off-by: Anton Blanchard <anton@samba.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Diffstat (limited to 'arch/powerpc/mm/numa.c')
0 files changed, 0 insertions, 0 deletions