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Old 07-08-2011, 10:39 PM
Mel Gorman
Default mm: vmscan: evaluate the watermarks against the corr=

BugLink: http://bugs.launchpad.net/bugs/808509

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 =

Signed-off-by: Mel Gorman <mgorman@suse.de>
Reported-by: P=C3=A1draig Brady <P@draigBrady.com>
Tested-by: P=C3=A1draig Brady <P@draigBrady.com>
Tested-by: Andrew Lutomirski <luto@mit.edu>
Acked-by: Rik van Riel <riel@redhat.com>
Reviewed-by: Minchan Kim <minchan.kim@gmail.com>
Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: <stable@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
(cherry picked from commit da175d06b437093f93109ba9e5efbe44dfdf9409)

Signed-off-by: Tim Gardner <tim.gardner@canonical.com>
mm/vmscan.c | 2 +-
1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/mm/vmscan.c b/mm/vmscan.c
index 7f8e890..136dc5e 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -2279,7 +2279,7 @@ static bool sleeping_prematurely(pg_data_t *pgdat, =
int order, long remaining,
if (!zone_watermark_ok_safe(zone, order, high_wmark_pages(zone),
- classzone_idx, 0))
+ i, 0))
all_zones_ok =3D false;
balanced +=3D zone->present_pages;

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