Re: Regression due to "mm/swap.c: flush lru pvecs on compound page arrival"

On Wed, Dec 14, 2016 at 03:14:54PM +0000, Ian Jackson wrote:

Michal Hocko writes ("Re: Regression due to "mm/swap.c: flush lru pvecs on compound page arrival""):

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On Wed 14-12-16 13:29:56, Ian Jackson wrote:

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This commit breaks the test "test-amd64-amd64-xl-qemut-win7-amd64" in
the Xen Project CI system.

Could you be more specific about the regression please?

The effect seems to be that it causes some kind of OOM condition
during boot under Xen:

Dec 14 08:00:04.637998 [   22.584134] Out of memory: Kill process 2747
(exim4) score 2 or sacrifice child

It's not quite clear to me but I think the problem may be hardware
specific.

Full logs are available here:

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  Last fail repro: http://logs.test-lab.xenproject.org/osstest/logs/103315/

See in particular this, which is the host serial console output:

http://logs.test-lab.xenproject.org/osstest/logs/103315/test-amd64-amd64-xl-qemut-win7-amd64/serial-elbling1.log

Start reading at Dec 14 07:59:33.478093.  At Dec 14 08:01:38.294433 a
log capture process started sending various debug keys to the console.

And is this also an issue in Linus's tree?

thanks,

greg k-h