linux-kernel - Re: android-kernel memory reclaim x20 boost?

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Date:	Wed, 18 Aug 2010 18:01:58 -0700
From:	Arve Hjønnevåg <arve@...roid.com>
To:	Minchan Kim <minchan.kim@...il.com>
Cc:	Alejandro Riveira Fernández <ariveira@...il.com>,
	swetland@...gle.com, linux-kernel <linux-kernel@...r.kernel.org>,
	linux-mm@...ck.org, San Mehat <san@...gle.com>
Subject: Re: android-kernel memory reclaim x20 boost?

On Wed, Aug 18, 2010 at 5:54 PM, Minchan Kim <minchan.kim@...il.com> wrote:
> On Thu, Aug 19, 2010 at 12:26 AM, Alejandro Riveira Fernández
> <ariveira@...il.com> wrote:
>> El Thu, 19 Aug 2010 00:18:57 +0900
>> Minchan Kim <minchan.kim@...il.com> escribió:
>>
>>> Hello Android forks,
>> [ ... ]
>>>
>>> I saw the advertisement phrase in this[1].
>>>
>>> "Kernel Memory Management Boost: Improved memory reclaim by up to 20x,
>>> which results in faster app switching and smoother performance
>>> on memory-constrained devices."
>>>
>>> But I can't find any code for it in android kernel git tree.
>>
>>  Maybe the enhancements are on the Dalvik VM (shooting in the dark here)
>
> Thanks.
> Android guys! Could you confirm this?
>

It is more likely referring to this change:

Author: San Mehat <san@...gle.com>
Date:   Wed May 5 11:38:42 2010 -0700

    staging: android: lowmemkiller: Substantially reduce overhead during reclaim

    This patch optimizes lowmemkiller to not do any work when it has
an outstanding
    kill-request. This greatly reduces the pressure on the task_list lock
    (improving interactivity), as well as improving the vmscan performance
    when under heavy memory pressure (by up to 20x in tests).

    Note: For this enhancement to work, you need CONFIG_PROFILING

    Signed-off-by: San Mehat <san@...gle.com>


-- 
Arve Hjønnevåg
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