Re: OOM killer changes

[Ralf-Peter Rohbeck <Ralf-Peter.Rohbeck@quantum.com>]

On 17.08.2016 00:56, Vlastimil Babka wrote:
>
> Again, migration failures are there but not so many, and failures to
> isolate freepages stand out. I assume it's because the kernel build
> workload and not the btrfs balance one.
>
> I think the patches in mmotm could make compaction try harder and use
> more appropriate watermarks, but it's not guaranteed that will help.
> The free scanner seems to become more and more a fundamental problem.
>
> And I really wonder how did all those unmovable pageblocks happen.
> AFAICS zoneinfo shows that most of memory is occupied by file lru pages.
> These should be movable.

Is it the pressure on the page cache? Don't forget that I write to some 
disk drives (recently, 2) at media speed with dd if=/dev/zero bs=4M 
of=/dev/SDX.


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