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

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Message-ID: <560C01BF.3040604@suse.cz>
Date:	Wed, 30 Sep 2015 17:37:35 +0200
From:	Vlastimil Babka <vbabka@...e.cz>
To:	Vitaly Wool <vitalywool@...il.com>,
	Minchan Kim <minchan@...nel.org>
Cc:	Sergey Senozhatsky <sergey.senozhatsky@...il.com>,
	Dan Streetman <ddstreet@...e.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Linux-MM <linux-mm@...ck.org>,
	김준수 <iamjoonsoo.kim@....com>,
	Gioh Kim <gioh.kim@....com>
Subject: Re: [PATCH 0/3] allow zram to use zbud as underlying allocator

On 09/25/2015 11:54 AM, Vitaly Wool wrote:
> Hello Minchan,
>
> the main use case where I see unacceptably long stalls in UI with
> zsmalloc is switching between users in Android.
> There is a way to automate user creation and switching between them so
> the test I run both to get vmstat statistics and to profile stalls is
> to create a user, switch to it and switch back. Each test cycle does
> that 10 times, and all the results presented below are averages for 20
> runs.
>
> Kernel configurations used for testing:
>
> (1): vanilla
> (2): (1) plus "make SLUB atomic" patch [1]
> (3): (1) with zbud instead of zsmalloc
> (4): (2) with compaction defer logic mostly disabled

Disabling compaction deferring leads to less compaction stalls? That 
indeed looks very weird and counter-intuitive. Also what's "mostly" 
disabled mean?

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