From: Rik van Riel <riel@redhat.com>
To: David Rientjes <rientjes@google.com>
Cc: Andrew Morton <akpm@linux-foundation.org>,
Mel Gorman <mel@csn.ul.ie>, Johannes Weiner <hannes@cmpxchg.org>,
Minchan Kim <minchan.kim@gmail.com>,
Wu Fengguang <fengguang.wu@intel.com>,
KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>,
KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>,
Jens Axboe <axboe@kernel.dk>,
linux-mm@kvack.org
Subject: Re: [patch] mm: clear pages_scanned only if draining a pcp adds pages to the buddy allocator
Date: Mon, 24 Jan 2011 12:09:08 -0500 [thread overview]
Message-ID: <4D3DB234.4050703@redhat.com> (raw)
In-Reply-To: <alpine.DEB.2.00.1101231457130.966@chino.kir.corp.google.com>
On 01/23/2011 05:58 PM, David Rientjes wrote:
> 0e093d99763e (writeback: do not sleep on the congestion queue if there
> are no congested BDIs or if significant congestion is not being
> encountered in the current zone) uncovered a livelock in the page
> allocator that resulted in tasks infinitely looping trying to find memory
> and kswapd running at 100% cpu.
>
> The issue occurs because drain_all_pages() is called immediately
> following direct reclaim when no memory is freed and try_to_free_pages()
> returns non-zero because all zones in the zonelist do not have their
> all_unreclaimable flag set.
Reviewed-by: Rik van Riel <riel@redhat.com>
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next prev parent reply other threads:[~2011-01-24 17:10 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-01-23 22:58 [patch] mm: clear pages_scanned only if draining a pcp adds pages to the buddy allocator David Rientjes
2011-01-24 17:09 ` Rik van Riel [this message]
2011-01-25 8:42 ` Johannes Weiner
2011-01-26 8:51 ` Mel Gorman
2011-01-30 2:10 ` Minchan Kim
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