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vmscan: count pages into balanced for zone with good watermark

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It's possible a zone watermark is ok when entering the balance_pgdat()
loop, while the zone is within the requested classzone_idx.  Count pages
from this zone into `balanced'.  In this way, we can skip shrinking zones
too much for high order allocation.

Signed-off-by: Shaohua Li <[email protected]>
Acked-by: Mel Gorman <[email protected]>
Reviewed-by: Minchan Kim <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Shaohua Li
2011-10-31 17:30:47 -07:00
committed by Linus Torvalds
parent 49ea7eb65e
commit 16fb951237
1 changed files with 2 additions and 0 deletions
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mm/vmscan.c
+2
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@@ -2748,6 +2748,8 @@ out:
/* If balanced, clear the congested flag */
zone_clear_flag(zone, ZONE_CONGESTED);
if (i <= *classzone_idx)
balanced += zone->present_pages;
}
}