From: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
To: Johannes Weiner <jweiner@redhat.com>
Cc: Andrew Morton <akpm@google.com>,
Kautuk Consul <consul.kautuk@gmail.com>,
Mel Gorman <mel@csn.ul.ie>, Minchan Kim <minchan.kim@gmail.com>,
Rik van Riel <riel@redhat.com>,
linux-mm@kvack.org, linux-kernel@vger.kernel.org,
Lee Schermerhorn <lee.schermerhorn@hp.com>,
KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>,
Andrew Morton <akpm@linux-foundation.org>
Subject: Re: [patch] mm: disable user interface to manually rescue unevictable pages
Date: Wed, 28 Sep 2011 13:51:38 +0900 [thread overview]
Message-ID: <20110928135138.5113bc30.kamezawa.hiroyu@jp.fujitsu.com> (raw)
In-Reply-To: <20110927072714.GA1997@redhat.com>
On Tue, 27 Sep 2011 09:27:14 +0200
Johannes Weiner <jweiner@redhat.com> wrote:
> At one point, anonymous pages were supposed to go on the unevictable
> list when no swap space was configured, and the idea was to manually
> rescue those pages after adding swap and making them evictable again.
> But nowadays, swap-backed pages on the anon LRU list are not scanned
> without available swap space anyway, so there is no point in moving
> them to a separate list anymore.
>
> The manual rescue could also be used in case pages were stranded on
> the unevictable list due to race conditions. But the code has been
> around for a while now and newly discovered bugs should be properly
> reported and dealt with instead of relying on such a manual fixup.
>
> In addition to the lack of a usecase, the sysfs interface to rescue
> pages from a specific NUMA node has been broken since its
> introduction, so it's unlikely that anybody ever relied on that.
>
> This patch removes the functionality behind the sysctl and the
> node-interface and emits a one-time warning when somebody tries to
> access either of them.
>
> Signed-off-by: Johannes Weiner <jweiner@redhat.com>
> Reported-by: Kautuk Consul <consul.kautuk@gmail.com>
Acked-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
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next prev parent reply other threads:[~2011-09-28 4:52 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-09-25 10:59 [PATCH 1/1] vmscan.c: Invalid strict_strtoul check in write_scan_unevictable_node Kautuk Consul
2011-09-26 9:20 ` KAMEZAWA Hiroyuki
2011-09-26 11:29 ` [patch] mm: remove sysctl to manually rescue unevictable pages Johannes Weiner
2011-09-26 12:10 ` kautuk.c @samsung.com
2011-09-26 12:29 ` kautuk.c @samsung.com
2011-09-26 14:25 ` Johannes Weiner
2011-09-26 14:55 ` kautuk.c @samsung.com
2011-09-26 14:18 ` Johannes Weiner
2011-09-26 23:11 ` Andrew Morton
2011-09-27 7:27 ` [patch] mm: disable user interface " Johannes Weiner
2011-09-28 2:14 ` Minchan Kim
2011-10-04 10:10 ` Johannes Weiner
2011-09-28 4:51 ` KAMEZAWA Hiroyuki [this message]
2011-09-28 1:00 ` [patch] mm: remove sysctl " KOSAKI Motohiro
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