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authorKOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>2009-12-14 17:58:55 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2009-12-15 08:53:16 -0800
commitbb3ab596832b920c703d1aea1ce76d69c0f71fb7 (patch)
tree048162bf5081e7bd9802eba012e8b680a4444da8 /mm/vmstat.c
parentf50de2d3811081957156b5d736778799379c29de (diff)
downloadvexpress-lsk-bb3ab596832b920c703d1aea1ce76d69c0f71fb7.tar.gz
vmscan: stop kswapd waiting on congestion when the min watermark is not being met
If reclaim fails to make sufficient progress, the priority is raised. Once the priority is higher, kswapd starts waiting on congestion. However, if the zone is below the min watermark then kswapd needs to continue working without delay as there is a danger of an increased rate of GFP_ATOMIC allocation failure. This patch changes the conditions under which kswapd waits on congestion by only going to sleep if the min watermarks are being met. [mel@csn.ul.ie: add stats to track how relevant the logic is] [mel@csn.ul.ie: make kswapd only check its own zones and rename the relevant counters] Signed-off-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com> Signed-off-by: Mel Gorman <mel@csn.ul.ie> Reviewed-by: Rik van Riel <riel@redhat.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/vmstat.c')
-rw-r--r--mm/vmstat.c5
1 files changed, 3 insertions, 2 deletions
diff --git a/mm/vmstat.c b/mm/vmstat.c
index 63ab71455c5..6051fbab67b 100644
--- a/mm/vmstat.c
+++ b/mm/vmstat.c
@@ -683,8 +683,9 @@ static const char * const vmstat_text[] = {
"slabs_scanned",
"kswapd_steal",
"kswapd_inodesteal",
- "kswapd_slept_prematurely_fast",
- "kswapd_slept_prematurely_slow",
+ "kswapd_low_wmark_hit_quickly",
+ "kswapd_high_wmark_hit_quickly",
+ "kswapd_skip_congestion_wait",
"pageoutrun",
"allocstall",