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Message-Id: <1308926697-22475-4-git-send-email-mgorman@suse.de>
Date: Fri, 24 Jun 2011 15:44:56 +0100
From: Mel Gorman <mgorman@...e.de>
To: Andrew Morton <akpm@...ux-foundation.org>
Cc: Pádraig Brady <P@...igBrady.com>,
James Bottomley <James.Bottomley@...senPartnership.com>,
Colin King <colin.king@...onical.com>,
Minchan Kim <minchan.kim@...il.com>,
Andrew Lutomirski <luto@....edu>,
Rik van Riel <riel@...hat.com>,
Johannes Weiner <hannes@...xchg.org>,
linux-mm <linux-mm@...ck.org>,
linux-kernel <linux-kernel@...r.kernel.org>,
Mel Gorman <mgorman@...e.de>
Subject: [PATCH 3/4] mm: vmscan: Evaluate the watermarks against the correct classzone
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 its sleeping prematurely
keeping kswapd awake in error.
Reported-and-tested-by: Pádraig Brady <P@...igBrady.com>
Signed-off-by: Mel Gorman <mgorman@...e.de>
---
mm/vmscan.c | 2 +-
1 files changed, 1 insertions(+), 1 deletions(-)
diff --git a/mm/vmscan.c b/mm/vmscan.c
index 9cebed1..a76b6cc2 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -2341,7 +2341,7 @@ 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;
--
1.7.3.4
--
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