From: Eric B Munson <emunson@mgebm.net>
To: Mel Gorman <mel@csn.ul.ie>
Cc: Andrew Morton <akpm@linux-foundation.org>,
Simon Kirby <sim@hostway.ca>,
KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>,
Shaohua Li <shaohua.li@intel.com>,
Dave Hansen <dave@linux.vnet.ibm.com>,
Johannes Weiner <hannes@cmpxchg.org>,
linux-mm <linux-mm@kvack.org>,
linux-kernel <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH 2/6] mm: kswapd: Keep kswapd awake for high-order allocations until a percentage of the node is balanced
Date: Mon, 13 Dec 2010 12:37:22 -0700 [thread overview]
Message-ID: <20101213193722.GD3401@mgebm.net> (raw)
In-Reply-To: <1291995985-5913-3-git-send-email-mel@csn.ul.ie>
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On Fri, 10 Dec 2010, Mel Gorman wrote:
> When reclaiming for high-orders, kswapd is responsible for balancing a
> node but it should not reclaim excessively. It avoids excessive reclaim by
> considering if any zone in a node is balanced then the node is balanced. In
> the cases where there are imbalanced zone sizes (e.g. ZONE_DMA with both
> ZONE_DMA32 and ZONE_NORMAL), kswapd can go to sleep prematurely as just
> one small zone was balanced.
>
> This alters the sleep logic of kswapd slightly. It counts the number of pages
> that make up the balanced zones. If the total number of balanced pages is
> more than a quarter of the zone, kswapd will go back to sleep. This should
> keep a node balanced without reclaiming an excessive number of pages.
>
> Signed-off-by: Mel Gorman <mel@csn.ul.ie>
> Reviewed-by: Minchan Kim <minchan.kim@gmail.com>
Reviewed-by: Eric B Munson <emunson@mgebm.net>
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next prev parent reply other threads:[~2010-12-13 19:37 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-12-10 15:46 [PATCH 0/6] Prevent kswapd dumping excessive amounts of memory in response to high-order allocations V4 Mel Gorman
2010-12-10 15:46 ` [PATCH 1/6] mm: kswapd: Stop high-order balancing when any suitable zone is balanced Mel Gorman
2010-12-13 19:34 ` Eric B Munson
2010-12-14 22:33 ` Andrew Morton
2010-12-15 10:42 ` Mel Gorman
2010-12-10 15:46 ` [PATCH 2/6] mm: kswapd: Keep kswapd awake for high-order allocations until a percentage of the node " Mel Gorman
2010-12-13 2:03 ` KAMEZAWA Hiroyuki
2010-12-13 19:37 ` Eric B Munson [this message]
2010-12-14 22:43 ` Andrew Morton
2010-12-15 10:54 ` Mel Gorman
2010-12-10 15:46 ` [PATCH 3/6] mm: kswapd: Use the order that kswapd was reclaiming at for sleeping_prematurely() Mel Gorman
2010-12-13 19:38 ` Eric B Munson
2010-12-10 15:46 ` [PATCH 4/6] mm: kswapd: Reset kswapd_max_order and classzone_idx after reading Mel Gorman
2010-12-13 19:39 ` Eric B Munson
2010-12-10 15:46 ` [PATCH 5/6] mm: kswapd: Treat zone->all_unreclaimable in sleeping_prematurely similar to balance_pgdat() Mel Gorman
2010-12-13 19:40 ` Eric B Munson
2010-12-10 15:46 ` [PATCH 6/6] mm: kswapd: Use the classzone idx that kswapd was using for sleeping_prematurely() Mel Gorman
2010-12-13 19:43 ` Eric B Munson
-- strict thread matches above, loose matches on Subject: below --
2010-12-09 11:18 [PATCH 0/5] Prevent kswapd dumping excessive amounts of memory in response to high-order allocations V3 Mel Gorman
2010-12-09 11:18 ` [PATCH 2/6] mm: kswapd: Keep kswapd awake for high-order allocations until a percentage of the node is balanced Mel Gorman
2010-12-09 15:42 ` Minchan Kim
2010-12-10 10:19 ` Mel Gorman
2010-12-10 1:16 ` KAMEZAWA Hiroyuki
2010-12-10 10:25 ` Mel Gorman
2010-12-13 17:00 ` Eric B Munson
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