Messages in this thread | | | Date | Wed, 28 Sep 2011 13:51:38 +0900 | From | KAMEZAWA Hiroyuki <> | Subject | Re: [patch] mm: disable user interface to manually rescue unevictable pages |
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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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