linux-kernel - [stable] upstream d913897abace8 -stable backport request

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Date:	Mon, 25 Jan 2016 21:50:51 +0900
From:	Sergey Senozhatsky <sergey.senozhatsky@...il.com>
To:	stable@...r.kernel.org
Cc:	Minchan Kim <minchan@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Kyeongdon Kim <kyeongdon.kim@....com>,
	linux-kernel@...r.kernel.org,
	Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>,
	Sergey Senozhatsky <sergey.senozhatsky@...il.com>
Subject: [stable] upstream d913897abace8 -stable backport request

Hello,

Please add upstream 'commit d913897abace8 ("zram: try vmalloc() after
kmalloc()")' to stable releases.

:commit d913897abace843bba20249f3190167f7895e9c3
:Author: Kyeongdon Kim <kyeongdon.kim@....com>
:
:    zram: try vmalloc() after kmalloc()
:    
:    When we're using LZ4 multi compression streams for zram swap, we found
:    out page allocation failure message in system running test.  That was
:    not only once, but a few(2 - 5 times per test).  Also, some failure
:    cases were continually occurring to try allocation order 3.
:    
:    In order to make parallel compression private data, we should call
:    kzalloc() with order 2/3 in runtime(lzo/lz4).  But if there is no order
:    2/3 size memory to allocate in that time, page allocation fails.  This
:    patch makes to use vmalloc() as fallback of kmalloc(), this prevents
:    page alloc failure warning.
:    
:    After using this, we never found warning message in running test, also
:    It could reduce process startup latency about 60-120ms in each case.

	-ss