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

On Fri, Jun 24, 2011 at 8:51 AM, Mel Gorman [off-list ref] wrote:

On Fri, Jun 24, 2011 at 11:24:24AM +0100, P?draig Brady wrote:

quoted

On 24/06/11 10:27, Minchan Kim wrote:

quoted

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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