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vmscan: stop kswapd waiting on congestion when the min watermark is not being met

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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.

[[email protected]: add stats to track how relevant the logic is]
[[email protected]: make kswapd only check its own zones and rename the relevant counters]
Signed-off-by: KOSAKI Motohiro <[email protected]>
Signed-off-by: Mel Gorman <[email protected]>
Reviewed-by: Rik van Riel <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
KOSAKI Motohiro 2009-12-14 17:58:55 -08:00 • committed by Linus Torvalds
commit bb3ab59683
3 changed files with 34 additions and 12 deletions
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5
mm/vmstat.c
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@ -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",