From: Andrew Lutomirski <luto@mit.edu>
To: Mel Gorman <mgorman@suse.de>
Cc: P?draig Brady <P@draigbrady.com>,
Minchan Kim <minchan.kim@gmail.com>,
linux-mm@kvack.org
Subject: Re: Root-causing kswapd spinning on Sandy Bridge laptops?
Date: Fri, 24 Jun 2011 09:32:01 -0400 [thread overview]
Message-ID: <BANLkTi=YAOTX08E=aPbbU9AcsiYPmiK2Ow@mail.gmail.com> (raw)
In-Reply-To: <20110624125131.GQ9396@suse.de>
On Fri, Jun 24, 2011 at 8:51 AM, Mel Gorman <mgorman@suse.de> 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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next prev parent reply other threads:[~2011-06-24 13:32 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-06-24 6:22 Root-causing kswapd spinning on Sandy Bridge laptops? Andrew Lutomirski
2011-06-24 9:27 ` Minchan Kim
2011-06-24 9:38 ` Minchan Kim
2011-06-24 10:24 ` Pádraig Brady
2011-06-24 12:15 ` Pádraig Brady
2011-06-24 12:51 ` Mel Gorman
2011-06-24 13:32 ` Andrew Lutomirski [this message]
2011-06-24 18:44 ` Andi Kleen
2011-06-24 18:48 ` Andrew Lutomirski
2011-06-24 19:13 ` Andi Kleen
2011-06-24 19:17 ` Christoph Hellwig
2011-06-24 18:54 ` Chris Mason
2011-06-27 11:03 ` Mel Gorman
2011-06-27 20:18 ` James Bottomley
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