48 lines
1.7 KiB
Diff
48 lines
1.7 KiB
Diff
From linux-fsdevel-owner@vger.kernel.org Fri May 13 10:03:52 2011
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From: Mel Gorman <mgorman@suse.de>
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To: Andrew Morton <akpm@linux-foundation.org>
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Cc: James Bottomley <James.Bottomley@HansenPartnership.com>,
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Colin King <colin.king@canonical.com>,
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Raghavendra D Prabhu <raghu.prabhu13@gmail.com>,
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Jan Kara <jack@suse.cz>, Chris Mason <chris.mason@oracle.com>,
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Christoph Lameter <cl@linux.com>,
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Pekka Enberg <penberg@kernel.org>,
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Rik van Riel <riel@redhat.com>,
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Johannes Weiner <hannes@cmpxchg.org>,
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linux-fsdevel <linux-fsdevel@vger.kernel.org>,
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linux-mm <linux-mm@kvack.org>,
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linux-kernel <linux-kernel@vger.kernel.org>,
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linux-ext4 <linux-ext4@vger.kernel.org>,
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Mel Gorman <mgorman@suse.de>
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Subject: [PATCH 4/4] mm: vmscan: If kswapd has been running too long, allow it to sleep
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Date: Fri, 13 May 2011 15:03:24 +0100
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Message-Id: <1305295404-12129-5-git-send-email-mgorman@suse.de>
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X-Mailing-List: linux-fsdevel@vger.kernel.org
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Under constant allocation pressure, kswapd can be in the situation where
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sleeping_prematurely() will always return true even if kswapd has been
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running a long time. Check if kswapd needs to be scheduled.
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Signed-off-by: Mel Gorman <mgorman@suse.de>
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---
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mm/vmscan.c | 4 ++++
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1 files changed, 4 insertions(+), 0 deletions(-)
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diff --git a/mm/vmscan.c b/mm/vmscan.c
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index af24d1e..4d24828 100644
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--- a/mm/vmscan.c
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+++ b/mm/vmscan.c
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@@ -2251,6 +2251,10 @@ static bool sleeping_prematurely(pg_data_t *pgdat, int order, long remaining,
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unsigned long balanced = 0;
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bool all_zones_ok = true;
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+ /* If kswapd has been running too long, just sleep */
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+ if (need_resched())
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+ return false;
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+
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/* If a direct reclaimer woke kswapd within HZ/10, it's premature */
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if (remaining)
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return true;
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--
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1.7.3.4
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