Re: Root-causing kswapd spinning on Sandy Bridge laptops?

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On Fri, Jun 24, 2011 at 8:51 AM, Mel Gorman <mgorman@xxxxxxx> wrote:
> On Fri, Jun 24, 2011 at 11:24:24AM +0100, P?draig Brady wrote:
>> On 24/06/11 10:27, Minchan Kim wrote:
>> > Hi Andrew,
>> >
>> > Sorry but right now I don't have a time to dive into this.
>> > But it seems to be similar to the problem Mel is looking at.
>> > Cced him.
>> >
>> > Even, Pádraig Brady seem to have a reproducible scenario.
>> > I will look when I have a time.
>> > I hope I will be back sooner or later.
>>
>> My reproducer is (I've 3GB RAM, 1.5G swap):
>>   dd bs=1M count=3000 if=/dev/zero of=spin.test
>>
>> To stop it spinning I just have to uncache the data,
>> the handiest way being:
>>   rm spin.test
>>
>> To confirm, the top of the profile I posted is:
>>   i915_gem_object_bind_to_gtt
>>     shrink_slab
>>
>
> I don't think it's an i915 bug. Another candidate fix in the other
> thread that Padraig started.

I bet you're right.  I do indeed have a tiny high zone.  (No clue why
-- I have 2G of ram right now.)

I won't be a reliable tester because I don't have a good way to
reproduce this bug.

--Andy

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