linux-kernel - Re: mmap/clone returns ENOMEM with lots of free memory

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Message-ID: <CAP145phLFDzoop_kUq-qN8a132Dj4oXsxJGcR_rv+LbZV-NObA@mail.gmail.com>
Date:	Tue, 8 May 2012 16:47:37 +0200
From:	Robert Święcki <robert@...ecki.net>
To:	Christoph Lameter <cl@...ux.com>
Cc:	linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: Re: mmap/clone returns ENOMEM with lots of free memory

On Tue, May 8, 2012 at 4:02 PM, Christoph Lameter <cl@...ux.com> wrote:
> On Mon, 7 May 2012, Robert Święcki wrote:
>
>> Yup (btw: I attached dump of some proc files and some debug commands
>> in the original e-mail - can be found here
>> http://marc.info/?l=linux-kernel&m=133640623421007&w=2 in case some
>> MTA removed them)
>>
>> CommitLimit:     1981528 kB
>> Committed_AS:    1916788 kB
>>
>> just not sure if Committed_AS should present this kind of value. Did I
>> just hit a legitimate condition, or may it suggest a bug? I'm a bit
>> puzzled cause
>
> This is a legitimate condition. No bug.
>>
>> root@...-test:/proc# grep Mem /proc/meminfo
>> MemTotal:        3963060 kB
>> MemFree:         3098324 kB
>
> Physical memory is free in quantity but virtual memory is exhausted.
>
>> Also, some sysctl values:
>> vm.overcommit_memory = 2
>> vm.overcommit_ratio = 50
>
> Setting overcommit memory to 2 means that the app is strictly policed
> for staying within bounds on virtual memory. Dont do that.
>
> See linux source linux/Documentation/vm/overcommit-accounting for more
> details.

Thanks Christoph.

-- 
Robert Święcki
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