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Message-ID: <AANLkTinjKK_jKm04BNmTRwq5uW8ainDcJHOXCGCmOXuD@mail.gmail.com>
Date: Wed, 18 Aug 2010 18:04:03 -0700
From: San Mehat <san@...gle.com>
To: Arve Hjønnevåg <arve@...roid.com>
Cc: Minchan Kim <minchan.kim@...il.com>,
Alejandro Riveira Fernández <ariveira@...il.com>,
swetland@...gle.com, linux-kernel <linux-kernel@...r.kernel.org>,
linux-mm@...ck.org
Subject: Re: android-kernel memory reclaim x20 boost?
On Wed, Aug 18, 2010 at 6:01 PM, Arve Hjønnevåg <arve@...roid.com> wrote:
> 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:
>
There are other changes after the one mentioned that remove the
requirement for CONFIG_PROFILING
(and the subsequent task_struct leak that was caused by it)
-san
> 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
>
--
San Mehat | Staff Software Engineer | Infrastructure | Google Inc.
415.366.6172 (san@...gle.com)
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