Re: [PATCH 0/4] reintroduce compaction feedback for OOM decisions

[Arkadiusz Miskiewicz <a.miskiewicz@gmail.com>]

On Tuesday 06 of September 2016, Vlastimil Babka wrote:
> After several people reported OOM's for order-2 allocations in 4.7 due to
> Michal Hocko's OOM rework, he reverted the part that considered compaction
> feedback [1] in the decisions to retry reclaim/compaction. This was to
> provide a fix quickly for 4.8 rc and 4.7 stable series, while mmotm had an
> almost complete solution that instead improved compaction reliability.
> 
> This series completes the mmotm solution and reintroduces the compaction
> feedback into OOM decisions. The first two patches restore the state of
> mmotm before the temporary solution was merged, the last patch should be
> the missing piece for reliability. The third patch restricts the hardened
> compaction to non-costly orders, since costly orders don't result in OOMs
> in the first place.
> 
> Some preliminary testing suggested that this approach should work, but I
> would like to ask all who experienced the regression to please retest
> this. You will need to apply this series on top of tag
> mmotm-2016-08-31-16-06 from the mmotm git tree [2]. Thanks in advance!

My "rm -rf copyX; cp -al org copyX" test x10 in parallel worked without any 
OOM.


-- 
Arkadiusz Miśkiewicz, arekm / ( maven.pl | pld-linux.org )