From: Mel Gorman <mgor...@suse.de>
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>
Cc: <sta...@kernel.org>
Signed-off-by: Andrew Morton <a...@linux-foundation.org>
---
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;
_
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