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vmscan: count pages into balanced for zone with good watermark 

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 <shaohua.li@intel.com>
Acked-by: Mel Gorman <mgorman@suse.de>
Reviewed-by: Minchan Kim <minchan.kim@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Shaohua Li 2011-10-31 17:08:02 -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
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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;
}
}