Messages in this thread | | | Date | Mon, 25 Jan 2016 21:50:51 +0900 | From | Sergey Senozhatsky <> | Subject | [stable] upstream d913897abace8 -stable backport request |
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Hello,
Please add upstream 'commit d913897abace8 ("zram: try vmalloc() after kmalloc()")' to stable releases.
:commit d913897abace843bba20249f3190167f7895e9c3 :Author: Kyeongdon Kim <kyeongdon.kim@lge.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
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