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Re: [PATCH v3 00/16] Support non-lru page migration

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On Wed, Mar 30, 2016 at 04:11:41PM -0700, Andrew Morton wrote:
> On Wed, 30 Mar 2016 16:11:59 +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 failed to fork easily.
> > 
> > The problem was fragmentation caused by zram and GPU driver
> > pages. Their pages cannot be migrated so compaction cannot
> > work well, either so reclaimer ends up shrinking all of working
> > set pages. It made system very slow and even to fail to fork
> > easily.
> > 
> > Other pain point is that they cannot work with CMA.
> > Most of CMA memory space could be idle(ie, it could be used
> > for movable pages unless driver is using) but if driver(i.e.,
> > zram) cannot migrate his page, that memory space could be
> > wasted. In our product which has big CMA memory, it reclaims
> > zones too exccessively although there are lots of free space
> > in CMA so system was very slow easily.
> > 
> > To solve these problem, this patch try to add facility to
> > migrate non-lru pages via introducing new friend functions
> > of migratepage in address_space_operation and new page flags.
> > 
> > 	(isolate_page, putback_page)
> > 	(PG_movable, PG_isolated)
> > 
> > For details, please read description in
> > "mm/compaction: support non-lru movable page migration".
> 
> OK, I grabbed all these.
> 
> I wonder about testing coverage during the -next period.  How many
> people are likely to exercise these code paths in a serious way before
> it all hits mainline?

I asked this patchset to production team in my company for stress
testing. They alaways catch zram/zsmalloc bugs I have missed so
I hope they help me well, too.

About ballooning part, I hope Rafael Aquini get a time to review
and test it.

Other than that, IOW, linux-next will have a enough time to
test common migration part modification, I guess. :)

Thanks.

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[PATCH v3 00/16] Support non-lru page migration Minchan Kim <minchan@kernel.org> - 2016-03-30 09:20 +0200
  [PATCH v3 08/16] zsmalloc: squeeze freelist into page->mapping Minchan Kim <minchan@kernel.org> - 2016-03-30 09:20 +0200
  [PATCH v3 13/16] zsmalloc: migrate head page of zspage Minchan Kim <minchan@kernel.org> - 2016-03-30 09:20 +0200
  [PATCH v3 11/16] zsmalloc: separate free_zspage from putback_zspage Minchan Kim <minchan@kernel.org> - 2016-03-30 09:20 +0200
  [PATCH v3 04/16] mm/balloon: use general movable page feature into balloon Minchan Kim <minchan@kernel.org> - 2016-03-30 09:20 +0200
  [PATCH v3 05/16] zsmalloc: keep max_object in size_class Minchan Kim <minchan@kernel.org> - 2016-03-30 09:20 +0200
  [PATCH v3 14/16] zsmalloc: use single linked list for page chain Minchan Kim <minchan@kernel.org> - 2016-03-30 09:20 +0200
  [PATCH v3 06/16] zsmalloc: squeeze inuse into page->mapping Minchan Kim <minchan@kernel.org> - 2016-03-30 09:20 +0200
  [PATCH v3 09/16] zsmalloc: move struct zs_meta from mapping to freelist Minchan Kim <minchan@kernel.org> - 2016-03-30 09:20 +0200
  [PATCH v3 16/16] zram: use __GFP_MOVABLE for memory allocation Minchan Kim <minchan@kernel.org> - 2016-03-30 09:20 +0200
  Re: [PATCH v3 00/16] Support non-lru page migration Andrew Morton <akpm@linux-foundation.org> - 2016-03-31 01:20 +0200
    Re: [PATCH v3 00/16] Support non-lru page migration Sergey Senozhatsky <sergey.senozhatsky.work@gmail.com> - 2016-03-31 02:30 +0200
      Re: [PATCH v3 00/16] Support non-lru page migration Minchan Kim <minchan@kernel.org> - 2016-03-31 03:00 +0200
    Re: [PATCH v3 00/16] Support non-lru page migration Minchan Kim <minchan@kernel.org> - 2016-03-31 03:00 +0200

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