2.6.39-stable review patch. If anyone has any objections, please let us know.
------------------
From: Mel Gorman <mgor...@suse.de>
commit da175d06b437093f93109ba9e5efbe44dfdf9409 upstream.
When deciding if kswapd is sleeping prematurely, the classzone is taken
into account but this is different to what balance_pgdat() and the
allocator are doing. Specifically, the DMA zone will be checked based on
the classzone used when waking kswapd which could be for a GFP_KERNEL or
GFP_HIGHMEM request. The lowmem reserve limit kicks in, the watermark is
not met and kswapd thinks it's sleeping prematurely keeping kswapd awake in
error.
Signed-off-by: Mel Gorman <mgor...@suse.de>
Reported-by: Pádraig Brady <p...@draigbrady.com>
Tested-by: Pádraig Brady <p...@draigbrady.com>
Tested-by: Andrew Lutomirski <l...@mit.edu>
Acked-by: Rik van Riel <r...@redhat.com>
Reviewed-by: Minchan Kim <minchan....@gmail.com>
Cc: KOSAKI Motohiro <kosaki.motoh...@jp.fujitsu.com>
Cc: Johannes Weiner <han...@cmpxchg.org>
Signed-off-by: Andrew Morton <a...@linux-foundation.org>
Signed-off-by: Linus Torvalds <torva...@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gre...@suse.de>
---
mm/vmscan.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -2279,7 +2279,7 @@ static bool sleeping_prematurely(pg_data
}
if (!zone_watermark_ok_safe(zone, order, high_wmark_pages(zone),
- classzone_idx, 0))
+ i, 0))
all_zones_ok = false;
else
balanced += zone->present_pages;
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