From: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
To: David Rientjes <rientjes@google.com>
Cc: balbir@linux.vnet.ibm.com,
"linux-mm@kvack.org" <linux-mm@kvack.org>,
"menage@google.com" <menage@google.com>,
KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>,
Marcelo Tosatti <mtosatti@redhat.com>
Subject: Re: [discuss][memcg] oom-kill extension
Date: Wed, 29 Oct 2008 14:28:58 +0900 [thread overview]
Message-ID: <20081029142858.2db54e92.kamezawa.hiroyu@jp.fujitsu.com> (raw)
In-Reply-To: <alpine.DEB.1.10.0810282206260.10159@chino.kir.corp.google.com>
On Tue, 28 Oct 2008 22:13:03 -0700 (PDT)
David Rientjes <rientjes@google.com> wrote:
>
> There was a patchset from February that added /dev/mem_notify to warn
> userspace of low or out of memory conditions:
>
> http://marc.info/?l=linux-kernel&m=120257050719077
> http://marc.info/?l=linux-kernel&m=120257050719087
> http://marc.info/?l=linux-kernel&m=120257062719234
> http://marc.info/?l=linux-kernel&m=120257071219327
> http://marc.info/?l=linux-kernel&m=120257071319334
> http://marc.info/?l=linux-kernel&m=120257080919488
> http://marc.info/?l=linux-kernel&m=120257081019497
> http://marc.info/?l=linux-kernel&m=120257096219705
> http://marc.info/?l=linux-kernel&m=120257096319717
>
> Perhaps this idea can simply be reworked for the memory controller or
> standalone cgroup?
>
I know and like that. The concept of mem_notify is notifing shortage of memory
by watching page reclaimation.
But the situation/usage/purpose is a bit different from oom-killer.
(oom-kill is the final stage to recover memory...)
To implement mem_notify in memcg's context, my idea is
- support followings.
=> account swap (now going on)
=> show usage of swap
=> "reduce memory usage" interface (to decrease noise from usage of file cache)
In usual systems, we watche"amount of swap".
In swapless systems, watches the amount of anonymous/locked memory under memcg.
Or "measure how much time we'll take to reduce memory usage to some level"
maybe it's interresting that we can add multi-purpose notifier to memcg.
for example,
- triggered when anonymous memory is over 95% of limits
- triggered when swap occurs.
(But can be done by user-land daemon...Hmm?)
Thanks,
-Kame
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next prev parent reply other threads:[~2008-10-29 5:29 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-10-29 2:38 KAMEZAWA Hiroyuki
2008-10-29 4:08 ` Balbir Singh
2008-10-29 5:00 ` KAMEZAWA Hiroyuki
2008-10-29 5:13 ` David Rientjes
2008-10-29 5:28 ` KAMEZAWA Hiroyuki [this message]
2008-10-29 6:55 ` KOSAKI Motohiro
2008-10-29 5:35 ` Paul Menage
2008-10-29 5:45 ` KAMEZAWA Hiroyuki
2008-10-29 5:49 ` Paul Menage
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