Re: readahead and oom

[Dave Young]

On Tue, Apr 26, 2011 at 2:05 PM, Dave Young <hidave.darkstar@xxxxxxxxx> wrote:
> On Tue, Apr 26, 2011 at 1:55 PM, Wu Fengguang <fengguang.wu@xxxxxxxxx> wrote:
>> On Tue, Apr 26, 2011 at 01:49:25PM +0800, Dave Young wrote:
>>> Hi,
>>>
>>> When memory pressure is high, readahead could cause oom killing.
>>> IMHO we should stop readaheading under such circumstancesãIf it's true
>>> how to fix it?
>>
>> Good question. Before OOM there will be readahead thrashings, which
>> can be addressed by this patch:
>>
>> http://lkml.org/lkml/2010/2/2/229
>
> Hi, I'm not clear about the patch, could be regard as below cases?
> 1) readahead alloc fail due to low memory such as other large allocation

For example vm balloon allocate lots of memory, then readahead could
fail immediately and then oom

> 2) readahead thrashing caused by itself
>
>>
>> However there seems no much interest on that feature.. I can separate
>> that out and resubmit it standalone if necessary.
>>
>> Thanks,
>> Fengguang
>>
>
>
>
> --
> Regards
> dave
>



-- 
Regards
dave
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