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From: Vitaly Wool <vitalywool@gmail.com>
To: Vlastimil Babka <vbabka@suse.cz>
Cc: "Minchan Kim" <minchan@kernel.org>,
	"Sergey Senozhatsky" <sergey.senozhatsky@gmail.com>,
	"Dan Streetman" <ddstreet@ieee.org>,
	LKML <linux-kernel@vger.kernel.org>,
	Linux-MM <linux-mm@kvack.org>, 김준수 <iamjoonsoo.kim@lge.com>,
	"Gioh Kim" <gioh.kim@lge.com>
Subject: Re: [PATCH 0/3] allow zram to use zbud as underlying allocator
Date: Wed, 30 Sep 2015 17:46:26 +0200	[thread overview]
Message-ID: <CAMJBoFNpqrr_5iuQ68TrRPP=Uv0SYPra6XH27NAcG+Apq=CoSg@mail.gmail.com> (raw)
In-Reply-To: <560C01BF.3040604@suse.cz>

On Wed, Sep 30, 2015 at 5:37 PM, Vlastimil Babka <vbabka@suse.cz> wrote:
> 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?

Not that I'm not surprised myself. However, this is how it goes.
Namely, I reverted the following patches:
- mm, compaction: defer each zone individually instead of preferred zone
- mm, compaction: embed migration mode in compact_control
- mm, compaction: add per-zone migration pfn cache for async compaction
- mm: compaction: encapsulate defer reset logic

~vitaly

  reply	other threads:[~2015-09-30 15:46 UTC|newest]

Thread overview: 31+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-09-14 13:49 [PATCH 0/3] allow zram to use zbud as underlying allocator Vitaly Wool
2015-09-14 13:50 ` [PATCH 1/3] zram: make max_zpage_size configurable Vitaly Wool
2015-09-15  1:00   ` Sergey Senozhatsky
     [not found]     ` <CAMJBoFPynFJpu57Gftm6bbyGfdSK67y-HbvoQPwyuHS6+0tOyQ@mail.gmail.com>
2015-09-15  7:38       ` Sergey Senozhatsky
2015-09-15  5:42   ` Dan Streetman
2015-09-15  6:08     ` Sergey Senozhatsky
2015-09-14 13:51 ` [PATCH 2/3] zpool/zsmalloc/zbud: align on interfaces Vitaly Wool
2015-09-15  1:06   ` Sergey Senozhatsky
2015-09-15  5:09     ` Dan Streetman
2015-09-14 13:55 ` [PATCH 3/3] zram: use common zpool interface Vitaly Wool
2015-09-15  1:12   ` Sergey Senozhatsky
2015-09-15  6:03     ` Dan Streetman
2015-09-14 14:01 ` [PATCH 0/3] allow zram to use zbud as underlying allocator Vlastimil Babka
2015-09-14 14:12   ` Vitaly Wool
2015-09-14 14:14     ` Vlastimil Babka
2015-09-15  4:08       ` Dan Streetman
2015-09-15  4:22         ` Sergey Senozhatsky
2015-09-17  6:21           ` Vlastimil Babka
2015-09-17  9:19             ` Sergey Senozhatsky
2015-09-15  0:49 ` Sergey Senozhatsky
2015-09-15  6:13 ` Minchan Kim
2015-09-25  9:54   ` Vitaly Wool
2015-09-30  7:52     ` Minchan Kim
2015-09-30  8:01       ` Vitaly Wool
2015-09-30  8:13         ` Minchan Kim
2015-09-30  8:18           ` Vitaly Wool
2015-09-30 15:37     ` Vlastimil Babka
2015-09-30 15:46       ` Vitaly Wool [this message]
2015-10-01  7:52         ` Vlastimil Babka
2015-10-10  9:33           ` Vitaly Wool
2015-10-14 13:28             ` Vlastimil Babka

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