From: "Vedran Furač" <vedran.furac@gmail.com>
To: Andrea Arcangeli <aarcange@redhat.com>
Cc: David Rientjes <rientjes@google.com>,
Hugh Dickins <hugh.dickins@tiscali.co.uk>,
KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>,
linux-mm@kvack.org, linux-kernel@vger.kernel.org,
KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>,
minchan.kim@gmail.com, Andrew Morton <akpm@linux-foundation.org>
Subject: Re: Memory overcommit
Date: Fri, 30 Oct 2009 15:41:12 +0100 [thread overview]
Message-ID: <4AEAFB08.8050305@gmail.com> (raw)
In-Reply-To: <20091030141250.GQ9640@random.random>
Andrea Arcangeli wrote:
> On Fri, Oct 30, 2009 at 02:53:33PM +0100, Vedran FuraA? wrote:
>> % free -m
>> total used free shared buffers cached
>> Mem: 3458 3429 29 0 102 1119
>> -/+ buffers/cache: 2207 1251
>>
>> There's plenty of memory available. Shouldn't cache be automatically
>> dropped (this question was in my original mail, hence the subject)?
>
> This is not about cache, cache amount is physical, this about
> virtual amount that can only go in ram or swap (at any later time,
> current time is irrelevant) vs "ram + swap".
Oh... so this is because apps "reserve" (Committed_AS?) more then they
currently need.
> In short add more swap if
> you don't like overcommit and check grep Commit /proc/meminfo in case
> this is accounting bug...
A the time of "malloc: Cannot allocate memory":
CommitLimit: 3364440 kB
Committed_AS: 3240200 kB
So probably everything is ok (and free is misleading). Overcommit is
unfortunately necessary if I want to be able to use all my memory.
Btw. http://www.redhat.com/advice/tips/meminfo.html says Committed_AS is
a (gu)estimate. Hope it is a good (not to high) guesstimate. :)
Regards,
Vedran
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next prev parent reply other threads:[~2009-10-30 14:41 UTC|newest]
Thread overview: 77+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <hav57c$rso$1@ger.gmane.org>
[not found] ` <20091013120840.a844052d.kamezawa.hiroyu@jp.fujitsu.com>
[not found] ` <hb2cfu$r08$2@ger.gmane.org>
[not found] ` <20091014135119.e1baa07f.kamezawa.hiroyu@jp.fujitsu.com>
2009-10-20 21:52 ` Vedran Furač
2009-10-26 1:55 ` KAMEZAWA Hiroyuki
2009-10-26 16:16 ` Vedran Furač
2009-10-27 3:22 ` KAMEZAWA Hiroyuki
2009-10-27 6:10 ` KOSAKI Motohiro
2009-10-27 6:34 ` Minchan Kim
2009-10-27 6:36 ` KAMEZAWA Hiroyuki
2009-10-27 6:55 ` Minchan Kim
2009-10-27 7:45 ` [RFC][PATCH] oom_kill: avoid depends on total_vm and use real RSS/swap value for oom_score (Re: " KAMEZAWA Hiroyuki
2009-10-27 7:56 ` Minchan Kim
2009-10-27 12:38 ` Andrea Arcangeli
2009-10-28 0:22 ` KAMEZAWA Hiroyuki
2009-10-28 0:45 ` Vedran Furač
2009-10-27 7:56 ` KAMEZAWA Hiroyuki
2009-10-27 8:14 ` Minchan Kim
2009-10-27 8:33 ` KAMEZAWA Hiroyuki
2009-10-27 8:52 ` Minchan Kim
2009-10-27 8:56 ` KAMEZAWA Hiroyuki
2009-10-27 17:41 ` Vedran Furač
2009-10-28 0:13 ` KAMEZAWA Hiroyuki
2009-10-27 18:39 ` Hugh Dickins
2009-10-27 18:47 ` Andrea Arcangeli
2009-10-28 0:32 ` KAMEZAWA Hiroyuki
2009-11-05 19:02 ` Pavel Machek
2009-10-28 0:28 ` KAMEZAWA Hiroyuki
2009-10-27 6:46 ` KOSAKI Motohiro
2009-10-27 6:56 ` Minchan Kim
2009-10-27 17:12 ` Vedran Furač
2009-10-27 18:02 ` KOSAKI Motohiro
2009-10-27 18:30 ` Vedran Furač
2009-10-27 20:44 ` Hugh Dickins
2009-10-27 21:04 ` David Rientjes
2009-10-28 0:08 ` Vedran Furač
2009-10-28 0:25 ` David Rientjes
2009-10-28 0:39 ` Vedran Furač
2009-10-28 4:08 ` David Rientjes
2009-10-28 4:55 ` KAMEZAWA Hiroyuki
2009-10-28 5:13 ` David Rientjes
2009-10-28 6:05 ` KAMEZAWA Hiroyuki
2009-10-28 6:17 ` David Rientjes
2009-10-28 6:20 ` KAMEZAWA Hiroyuki
2009-10-29 8:38 ` David Rientjes
2009-10-29 11:11 ` Vedran Furač
2009-10-29 19:53 ` David Rientjes
2009-10-29 23:48 ` KAMEZAWA Hiroyuki
2009-10-30 9:10 ` David Rientjes
2009-10-30 9:36 ` KAMEZAWA Hiroyuki
2009-11-03 20:49 ` David Rientjes
2009-11-04 0:50 ` KAMEZAWA Hiroyuki
2009-11-04 1:58 ` David Rientjes
2009-11-04 2:17 ` KAMEZAWA Hiroyuki
2009-11-04 3:10 ` David Rientjes
2009-11-04 3:19 ` KAMEZAWA Hiroyuki
2009-10-30 13:59 ` Vedran Furač
2009-10-30 19:24 ` David Rientjes
2009-11-02 19:58 ` Vedran Furač
2009-10-28 13:28 ` Vedran Furač
2009-10-28 20:10 ` David Rientjes
2009-10-29 3:05 ` Vedran Furač
2009-10-29 8:35 ` David Rientjes
2009-10-29 11:01 ` Vedran Furač
2009-10-29 19:42 ` David Rientjes
2009-10-30 13:53 ` Vedran Furač
2009-10-30 14:08 ` Thomas Fjellstrom
2009-10-30 15:13 ` Vedran Furač
2009-10-30 14:12 ` Andrea Arcangeli
2009-10-30 14:41 ` Vedran Furač [this message]
2009-10-30 15:15 ` Andrea Arcangeli
2009-10-30 16:24 ` Hugh Dickins
2009-11-02 19:56 ` Vedran Furač
2009-10-30 19:44 ` David Rientjes
2009-11-02 19:56 ` Vedran Furač
2009-10-28 0:43 ` KAMEZAWA Hiroyuki
2009-10-28 2:47 ` KOSAKI Motohiro
2009-10-28 3:17 ` KAMEZAWA Hiroyuki
2009-10-28 4:12 ` David Rientjes
2009-10-28 8:10 ` Hugh Dickins
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