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
WARNING: multiple messages have this Message-ID (diff)
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
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next prev parent reply other threads:[~2015-09-30 15:46 UTC|newest]
Thread overview: 63+ 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 13:49 ` Vitaly Wool
2015-09-14 13:50 ` [PATCH 1/3] zram: make max_zpage_size configurable Vitaly Wool
2015-09-14 13:50 ` Vitaly Wool
2015-09-15 1:00 ` Sergey Senozhatsky
2015-09-15 1:00 ` Sergey Senozhatsky
2015-09-15 7:18 ` Vitaly Wool
2015-09-15 7:38 ` Sergey Senozhatsky
2015-09-15 7:38 ` Sergey Senozhatsky
2015-09-15 5:42 ` Dan Streetman
2015-09-15 5:42 ` Dan Streetman
2015-09-15 6:08 ` Sergey Senozhatsky
2015-09-15 6:08 ` Sergey Senozhatsky
2015-09-14 13:51 ` [PATCH 2/3] zpool/zsmalloc/zbud: align on interfaces Vitaly Wool
2015-09-14 13:51 ` Vitaly Wool
2015-09-15 1:06 ` Sergey Senozhatsky
2015-09-15 1:06 ` Sergey Senozhatsky
2015-09-15 5:09 ` Dan Streetman
2015-09-15 5:09 ` Dan Streetman
2015-09-14 13:55 ` [PATCH 3/3] zram: use common zpool interface Vitaly Wool
2015-09-14 13:55 ` Vitaly Wool
2015-09-15 1:12 ` Sergey Senozhatsky
2015-09-15 1:12 ` Sergey Senozhatsky
2015-09-15 6:03 ` Dan Streetman
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 14:01 ` Vlastimil Babka
2015-09-14 14:12 ` Vitaly Wool
2015-09-14 14:12 ` Vitaly Wool
2015-09-14 14:14 ` Vlastimil Babka
2015-09-14 14:14 ` Vlastimil Babka
2015-09-15 4:08 ` Dan Streetman
2015-09-15 4:08 ` Dan Streetman
2015-09-15 4:22 ` Sergey Senozhatsky
2015-09-15 4:22 ` Sergey Senozhatsky
2015-09-17 6:21 ` Vlastimil Babka
2015-09-17 6:21 ` Vlastimil Babka
2015-09-17 9:19 ` Sergey Senozhatsky
2015-09-17 9:19 ` Sergey Senozhatsky
2015-09-15 0:49 ` Sergey Senozhatsky
2015-09-15 0:49 ` Sergey Senozhatsky
2015-09-15 6:13 ` Minchan Kim
2015-09-15 6:13 ` Minchan Kim
2015-09-25 9:54 ` Vitaly Wool
2015-09-25 9:54 ` Vitaly Wool
2015-09-30 7:52 ` Minchan Kim
2015-09-30 7:52 ` Minchan Kim
2015-09-30 8:01 ` Vitaly Wool
2015-09-30 8:01 ` Vitaly Wool
2015-09-30 8:13 ` Minchan Kim
2015-09-30 8:13 ` Minchan Kim
2015-09-30 8:18 ` Vitaly Wool
2015-09-30 8:18 ` Vitaly Wool
2015-09-30 15:37 ` Vlastimil Babka
2015-09-30 15:37 ` Vlastimil Babka
2015-09-30 15:46 ` Vitaly Wool [this message]
2015-09-30 15:46 ` Vitaly Wool
2015-10-01 7:52 ` Vlastimil Babka
2015-10-01 7:52 ` Vlastimil Babka
2015-10-10 9:33 ` Vitaly Wool
2015-10-10 9:33 ` Vitaly Wool
2015-10-14 13:28 ` Vlastimil Babka
2015-10-14 13:28 ` Vlastimil Babka
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