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[PATCH] zone_reclaim: configurable off node allocation period.

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Currently the zone_reclaim code has a fixed window of 30 seconds of off node
allocations should a local zone have no unused pagecache pages left.  Reclaim
will be attempted again after this timeout period to avoid repeated useless
scans for memory.  This is also useful to established sufficiently large off
node allocation chunks to relieve the local node.

It may be beneficial to adjust that time period for some special situations.
For example if memory use was exceeding node capacity one may want to give up
for longer periods of time.  If memory spikes intermittendly then one may want
to shorten the time period to reduce the number of off node allocations.

This patch allows just that....

Signed-off-by: Christoph Lameter <clameter@sgi.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Christoph Lameter
2006-02-01 03:05:33 -08:00
committed by Linus Torvalds
parent a92f71263a
commit 2a11ff06d7
5 changed files with 26 additions and 3 deletions
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include/linux/swap.h
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@@ -178,6 +178,7 @@ extern int vm_swappiness;
#ifdef CONFIG_NUMA
extern int zone_reclaim_mode;
extern int zone_reclaim_interval;
extern int zone_reclaim(struct zone *, gfp_t, unsigned int);
#else
#define zone_reclaim_mode 0