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Date: Wed, 24 Aug 2016 09:29:49 +0800 From: Hui Zhu <teawater@...il.com> To: Minchan Kim <minchan@...nel.org> Cc: Hui Zhu <zhuhui@...omi.com>, ngupta@...are.org, sergey.senozhatsky.work@...il.com, Hugh Dickins <hughd@...gle.com>, Steven Rostedt <rostedt@...dmis.org>, Ingo Molnar <mingo@...hat.com>, Peter Zijlstra <peterz@...radead.org>, acme@...nel.org, alexander.shishkin@...ux.intel.com, Andrew Morton <akpm@...ux-foundation.org>, mhocko@...e.com, hannes@...xchg.org, mgorman@...hsingularity.net, vbabka@...e.cz, redkoi@...tuozzo.com, luto@...nel.org, kirill.shutemov@...ux.intel.com, geliangtang@....com, baiyaowei@...s.chinamobile.com, dan.j.williams@...el.com, vdavydov@...tuozzo.com, aarcange@...hat.com, dvlasenk@...hat.com, jmarchan@...hat.com, koct9i@...il.com, yang.shi@...aro.org, dave.hansen@...ux.intel.com, vkuznets@...hat.com, vitalywool@...il.com, ross.zwisler@...ux.intel.com, Thomas Gleixner <tglx@...utronix.de>, kwapulinski.piotr@...il.com, axboe@...com, mchristi@...hat.com, Joe Perches <joe@...ches.com>, namit@...are.com, Rik van Riel <riel@...hat.com>, "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>, Linux Memory Management List <linux-mm@...ck.org> Subject: Re: [RFC 0/4] ZRAM: make it just store the high compression rate page Hi Minchan, On Wed, Aug 24, 2016 at 9:04 AM, Minchan Kim <minchan@...nel.org> wrote: > Hi Hui, > > On Mon, Aug 22, 2016 at 04:25:05PM +0800, Hui Zhu wrote: >> Current ZRAM just can store all pages even if the compression rate >> of a page is really low. So the compression rate of ZRAM is out of >> control when it is running. >> In my part, I did some test and record with ZRAM. The compression rate >> is about 40%. >> >> This series of patches make ZRAM can just store the page that the >> compressed size is smaller than a value. >> With these patches, I set the value to 2048 and did the same test with >> before. The compression rate is about 20%. The times of lowmemorykiller >> also decreased. > > I have an interest about the feature for a long time but didn't work on it > because I didn't have a good idea to implment it with generic approach > without layer violation. I will look into this after handling urgent works. > > Thanks. That will be great. Thanks. Best, Hui
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