Messages in this thread | | | Date | Wed, 1 Jun 2016 14:41:51 -0700 | From | Andrew Morton <> | Subject | Re: [PATCH v7 00/12] Support non-lru page migration |
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On Wed, 1 Jun 2016 08:21:09 +0900 Minchan Kim <minchan@kernel.org> wrote:
> Recently, I got many reports about perfermance degradation in embedded > system(Android mobile phone, webOS TV and so on) and easy fork fail. > > The problem was fragmentation caused by zram and GPU driver mainly. > With memory pressure, their pages were spread out all of pageblock and > it cannot be migrated with current compaction algorithm which supports > only LRU pages. In the end, compaction cannot work well so reclaimer > shrinks all of working set pages. It made system very slow and even to > fail to fork easily which requires order-[2 or 3] allocations. > > Other pain point is that they cannot use CMA memory space so when OOM > kill happens, I can see many free pages in CMA area, which is not > memory efficient. In our product which has big CMA memory, it reclaims > zones too exccessively to allocate GPU and zram page although there are > lots of free space in CMA so system becomes very slow easily.
But this isn't presently implemented for GPU drivers or for CMA, yes?
What's the story there?
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