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| author | KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com> | 2010-01-15 17:01:25 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2010-01-16 12:15:39 -0800 |
| commit | de3fab39348dff18c69a0cd04efee9c276a02f51 (patch) | |
| tree | 1fc5a20da15541e23d02c33ae0bb574fb1f2e40f /mm/vmscan.c | |
| parent | af2422c42c0ff42b8b93dbb3a5fe65250fb65c40 (diff) | |
| download | lwn-de3fab39348dff18c69a0cd04efee9c276a02f51.tar.gz lwn-de3fab39348dff18c69a0cd04efee9c276a02f51.zip | |
vmscan: kswapd: don't retry balance_pgdat() if all zones are unreclaimable
Commit f50de2d3 (vmscan: have kswapd sleep for a short interval and double
check it should be asleep) can cause kswapd to enter an infinite loop if
running on a single-CPU system. If all zones are unreclaimble,
sleeping_prematurely return 1 and kswapd will call balance_pgdat() again.
but it's totally meaningless, balance_pgdat() doesn't anything against
unreclaimable zone!
Signed-off-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Cc: Mel Gorman <mel@csn.ul.ie>
Reported-by: Will Newton <will.newton@gmail.com>
Reviewed-by: Minchan Kim <minchan.kim@gmail.com>
Reviewed-by: Rik van Riel <riel@redhat.com>
Tested-by: Will Newton <will.newton@gmail.com>
Reviewed-by: Wu Fengguang <fengguang.wu@intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/vmscan.c')
| -rw-r--r-- | mm/vmscan.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/mm/vmscan.c b/mm/vmscan.c index 885207a6b6b7..c26986c85ce0 100644 --- a/mm/vmscan.c +++ b/mm/vmscan.c @@ -1922,6 +1922,9 @@ static int sleeping_prematurely(pg_data_t *pgdat, int order, long remaining) if (!populated_zone(zone)) continue; + if (zone_is_all_unreclaimable(zone)) + continue; + if (!zone_watermark_ok(zone, order, high_wmark_pages(zone), 0, 0)) return 1; |