commit: da175d06b437093f93109ba9e5efbe44dfdf9409 From: Mel Gorman <[email protected]> Date: Fri, 8 Jul 2011 15:39:39 -0700 Subject: [PATCH] mm: vmscan: evaluate the watermarks against the correct classzone MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit
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]> Reviewed-by: Minchan Kim <[email protected]> Cc: KOSAKI Motohiro <[email protected]> Cc: Johannes Weiner <[email protected]> Cc: <[email protected]> Signed-off-by: Andrew Morton <[email protected]> Signed-off-by: Linus Torvalds <[email protected]> --- mm/vmscan.c | 2 +- 1 files changed, 1 insertions(+), 1 deletions(-) diff --git a/mm/vmscan.c b/mm/vmscan.c index a024586..a51b3c9 100644 --- a/mm/vmscan.c +++ b/mm/vmscan.c @@ -2344,7 +2344,7 @@ 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 = false; else balanced += zone->present_pages;
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