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[PATCH] oom: use unreclaimable info 

__alloc_pages currently starts shooting if page reclaim has failed to free up
swap_cluster_max pages in one run through the priorities.  This is not always
a good indicator on its own, so make use of the all_unreclaimable logic as
well: don't consider going OOM until all zones we're interested in are
unreclaimable.

Signed-off-by: Nick Piggin <npiggin@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Nick Piggin 2006-09-25 23:31:27 -07:00 committed by Linus Torvalds
parent 6ddab3b9eb
commit 408d85441c
1 changed files with 8 additions and 0 deletions
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8
mm/vmscan.c
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@ -62,6 +62,8 @@ struct scan_control {
int swap_cluster_max;
int swappiness;
int all_unreclaimable;
};
/*
@ -925,6 +927,7 @@ static unsigned long shrink_zones(int priority, struct zone **zones,
unsigned long nr_reclaimed = 0;
int i;
sc->all_unreclaimable = 1;
for (i = 0; zones[i] != NULL; i++) {
struct zone *zone = zones[i];
@ -941,6 +944,8 @@ static unsigned long shrink_zones(int priority, struct zone **zones,
if (zone->all_unreclaimable && priority != DEF_PRIORITY)
continue; /* Let kswapd poll it */
sc->all_unreclaimable = 0;
nr_reclaimed += shrink_zone(priority, zone, sc);
}
return nr_reclaimed;
@ -1021,6 +1026,9 @@ unsigned long try_to_free_pages(struct zone **zones, gfp_t gfp_mask)
if (sc.nr_scanned && priority < DEF_PRIORITY - 2)
blk_congestion_wait(WRITE, HZ/10);
}
/* top priority shrink_caches still had more to do? don't OOM, then */
if (!sc.all_unreclaimable)
ret = 1;
out:
for (i = 0; zones[i] != 0; i++) {
struct zone *zone = zones[i];