linux-kernel - Re: Problem: Out of memory after 2days with 2GB RAM

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Message-ID: <1ba2fa240806120938i248d38bek2a9155defff9428f@mail.gmail.com>
Date:	Thu, 12 Jun 2008 19:38:05 +0300
From:	"Tomas Winkler" <tomasw@...il.com>
To:	"Zdenek Kabelac" <zdenek.kabelac@...il.com>
Cc:	"Johannes Berg" <johannes@...solutions.net>,
	"Rik van Riel" <riel@...hat.com>,
	"Linux Kernel Mailing List" <linux-kernel@...r.kernel.org>,
	yi.zhu@...el.com, reinette.chatre@...el.com,
	linux-wireless@...r.kernel.org
Subject: Re: Problem: Out of memory after 2days with 2GB RAM

On Thu, Jun 12, 2008 at 5:12 PM, Zdenek Kabelac
<zdenek.kabelac@...il.com> wrote:
> 2008/6/12 Johannes Berg <johannes@...solutions.net>:
>> On Thu, 2008-06-12 at 09:38 -0400, Rik van Riel wrote:
>>> On Thu, 12 Jun 2008 12:07:34 +0200
>>> "Zdenek Kabelac" <zdenek.kabelac@...il.com> wrote:
>>>
>>> > It looks like while there was a huge amount of buffers and caches -
>>> > system was unable to allocate few pages for kmalloc in iwl3945 driver
>>> > after resume.
>>>
>>> It looks like this is because it wants to allocate 2**5 contiguous
>>> pages, which is 128kB of contiguous kernel memory.
>>
>> 64-bit system I assume?
>> The allocation should be 256 * 20 * sizeof(struct sk_buff *).
>>
>> Try the patch below. It should improve code generation too.
>
> I'll surely try you patch - but is the iwl the only driver which needs
> 128kB continuous memory chunk?

We do some stupid free-alloc sequence on restart this is where it
fails. I'm still polishing a patch that eliminates it.
Tomas
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