linux-kernel - Re: [PATCH 0/3] allow zram to use zbud as underlying allocator

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Message-ID: <CAMJBoFMD8jj372sXfb5NkT2MBzBUQp232U7XxO9QHKco+mHUYQ@mail.gmail.com>
Date:	Mon, 14 Sep 2015 16:12:22 +0200
From:	Vitaly Wool <vitalywool@...il.com>
To:	Vlastimil Babka <vbabka@...e.cz>
Cc:	minchan@...nel.org, sergey.senozhatsky@...il.com,
	ddstreet@...e.org, LKML <linux-kernel@...r.kernel.org>,
	linux-mm@...ck.org
Subject: Re: [PATCH 0/3] allow zram to use zbud as underlying allocator

On Mon, Sep 14, 2015 at 4:01 PM, Vlastimil Babka <vbabka@...e.cz> wrote:
>
> On 09/14/2015 03:49 PM, Vitaly Wool wrote:
>>
>> While using ZRAM on a small RAM footprint devices, together with
>> KSM,
>> I ran into several occasions when moving pages from compressed swap back
>> into the "normal" part of RAM caused significant latencies in system
>
>
> I'm sure Minchan will want to hear the details of that :)
>
>> operation. By using zbud I lose in compression ratio but gain in
>> determinism, lower latencies and lower fragmentation, so in the coming
>
>
> I doubt the "lower fragmentation" part given what I've read about the design of zbud and zsmalloc?

As it turns out, I see more cases of compaction kicking in and
significantly more compact_stalls with zsmalloc.

~vitaly
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