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

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Date:	Thu, 31 Mar 2016 09:57:17 +0900
From:	Minchan Kim <minchan@...nel.org>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	jlayton@...chiereds.net, bfields@...ldses.org,
	Vlastimil Babka <vbabka@...e.cz>,
	Joonsoo Kim <iamjoonsoo.kim@....com>, koct9i@...il.com,
	aquini@...hat.com, virtualization@...ts.linux-foundation.org,
	Mel Gorman <mgorman@...e.de>, Hugh Dickins <hughd@...gle.com>,
	Sergey Senozhatsky <sergey.senozhatsky@...il.com>,
	Rik van Riel <riel@...hat.com>, rknize@...orola.com,
	Gioh Kim <gi-oh.kim@...fitbricks.com>,
	Sangseok Lee <sangseok.lee@....com>,
	Chan Gyun Jeong <chan.jeong@....com>,
	Al Viro <viro@...IV.linux.org.uk>,
	YiPing Xu <xuyiping@...ilicon.com>
Subject: Re: [PATCH v3 00/16] Support non-lru page migration

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@...nel.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.