It's possible a zone watermark is ok at entering balance_pgdat loop, while the
zone is within requested classzone_idx. Countering pages from the zone into
balanced. In this way, we can skip shrinking zones too much for high
order allocation.
Signed-off-by: Shaohua Li <shaohua.li@xxxxxxxxx>
---
mm/vmscan.c | 2 ++
1 file changed, 2 insertions(+)
Index: linux/mm/vmscan.c
===================================================================
--- linux.orig/mm/vmscan.c 2011-07-28 15:17:56.000000000 +0800
+++ linux/mm/vmscan.c 2011-07-28 15:34:48.000000000 +0800
@@ -2497,6 +2497,8 @@ loop_again:
} else {
/* If balanced, clear the congested flag */
zone_clear_flag(zone, ZONE_CONGESTED);
+ if (i <= *classzone_idx)
+ balanced += zone->present_pages;
}
}
if (i < 0)
--
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