The patch titled
mm: vmscan: evaluate the watermarks against the correct classzone
has been added to the -mm tree. Its filename is
mm-vmscan-evaluate-the-watermarks-against-the-correct-classzone.patch
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See http://userweb.kernel.org/~akpm/stuff/added-to-mm.txt to find
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The current -mm tree may be found at http://userweb.kernel.org/~akpm/mmotm/
------------------------------------------------------
Subject: mm: vmscan: evaluate the watermarks against the correct classzone
From: Mel Gorman <[email protected]>
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 <[email protected]>
Reported-by: Pádraig Brady <[email protected]>
Tested-by: Pádraig Brady <[email protected]>
Tested-by: Andrew Lutomirski <[email protected]>
Acked-by: Rik van Riel <[email protected]>
Cc: Minchan Kim <[email protected]>
Cc: KOSAKI Motohiro <[email protected]>
Cc: Johannes Weiner <[email protected]>
Cc: <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
---
mm/vmscan.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff -puN
mm/vmscan.c~mm-vmscan-evaluate-the-watermarks-against-the-correct-classzone
mm/vmscan.c
---
a/mm/vmscan.c~mm-vmscan-evaluate-the-watermarks-against-the-correct-classzone
+++ a/mm/vmscan.c
@@ -2344,7 +2344,7 @@ 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;
_
Patches currently in -mm which might be from [email protected] are
mm-vmscan-correct-check-for-kswapd-sleeping-in-sleeping_prematurely.patch
mm-vmscan-do-not-apply-pressure-to-slab-if-we-are-not-applying-pressure-to-zone.patch
mm-vmscan-evaluate-the-watermarks-against-the-correct-classzone.patch
mm-vmscan-only-read-new_classzone_idx-from-pgdat-when-reclaiming-successfully.patch
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