linux-kernel - Re: [PATCH v1 0/3] per-process reclaim

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Message-ID: <575EA573.2010204@huawei.com>
Date:	Mon, 13 Jun 2016 20:22:11 +0800
From:	"ZhaoJunmin Zhao(Junmin)" <zhaojunmin@...wei.com>
To:	Chen Feng <puck.chen@...ilicon.com>,
	Minchan Kim <minchan@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>
CC:	<linux-kernel@...r.kernel.org>, <linux-mm@...ck.org>,
	Rik van Riel <riel@...hat.com>,
	Redmond <u93410091@...il.com>,
	Vinayak Menon <vinmenon@...eaurora.org>,
	Juneho Choi <juno.choi@....com>,
	Sangwoo Park <sangwoo2.park@....com>,
	Chan Gyun Jeong <chan.jeong@....com>
Subject: Re: [PATCH v1 0/3] per-process reclaim



在 2016/6/13 19:50, Chen Feng 写道:
> Hi Minchan,
>
> On 2016/6/13 15:50, Minchan Kim wrote:
>> Hi all,
>>
>> http://thread.gmane.org/gmane.linux.kernel/1480728
>>
>> I sent per-process reclaim patchset three years ago. Then, last
>> feedback from akpm was that he want to know real usecase scenario.
>>
>> Since then, I got question from several embedded people of various
>> company "why it's not merged into mainline" and heard they have used
>> the feature as in-house patch and recenlty, I noticed android from
>> Qualcomm started to use it.
>>
>> Of course, our product have used it and released it in real procuct.
>>
>> Quote from Sangwoo Park <angwoo2.park@....com>
>> Thanks for the data, Sangwoo!
>> "
>> - Test scenaro
>>    - platform: android
>>    - target: MSM8952, 2G DDR, 16G eMMC
>>    - scenario
>>      retry app launch and Back Home with 16 apps and 16 turns
>>      (total app launch count is 256)
>>    - result:
>> 			  resume count   |  cold launching count
>> -----------------------------------------------------------------
>>   vanilla           |           85        |          171
>>   perproc reclaim   |           184       |           72
>> "
>>
>> Higher resume count is better because cold launching needs loading
>> lots of resource data which takes above 15 ~ 20 seconds for some
>> games while successful resume just takes 1~5 second.
>>
>> As perproc reclaim way with new management policy, we could reduce
>> cold launching a lot(i.e., 171-72) so that it reduces app startup
>> a lot.
>>
>> Another useful function from this feature is to make swapout easily
>> which is useful for testing swapout stress and workloads.
>>
> Thanks Minchan.
>
> Yes, this is useful interface when there are memory pressure and let the userspace(Android)
> to pick process for reclaim. We also take there series into our platform.
>
> But I have a question on the reduce app startup time. Can you also share your
> theory(management policy) on how can the app reduce it's startup time?
>
>
>> Thanks.

Yes, In Huawei device, we use the interface now! Now according to 
procsss LRU state in ActivityManagerService, we can reclaim some process
in proactive way.

>>
>> Cc: Redmond <u93410091@...il.com>
>> Cc: ZhaoJunmin Zhao(Junmin) <zhaojunmin@...wei.com>
>> Cc: Vinayak Menon <vinmenon@...eaurora.org>
>> Cc: Juneho Choi <juno.choi@....com>
>> Cc: Sangwoo Park <sangwoo2.park@....com>
>> Cc: Chan Gyun Jeong <chan.jeong@....com>
>>
>> Minchan Kim (3):
>>    mm: vmscan: refactoring force_reclaim
>>    mm: vmscan: shrink_page_list with multiple zones
>>    mm: per-process reclaim
>>
>>   Documentation/filesystems/proc.txt |  15 ++++
>>   fs/proc/base.c                     |   1 +
>>   fs/proc/internal.h                 |   1 +
>>   fs/proc/task_mmu.c                 | 149 +++++++++++++++++++++++++++++++++++++
>>   include/linux/rmap.h               |   4 +
>>   mm/vmscan.c                        |  85 ++++++++++++++++-----
>>   6 files changed, 235 insertions(+), 20 deletions(-)
>>
>
>
> .
>