linux-kernel - Re: [PATCH 1/1] kernel/sysctl.c: Add /proc/sys/vm/shrink

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Date:	Mon, 6 Jul 2015 18:22:53 +0800
From:	Xishi Qiu <qiuxishi@...wei.com>
To:	Pintu Kumar <pintu.k@...sung.com>
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Subject: Re: [PATCH 1/1] kernel/sysctl.c: Add /proc/sys/vm/shrink_memory feature

On 2015/7/3 21:20, Pintu Kumar wrote:

> This patch provides 2 things:
> 1. Add new control called shrink_memory in /proc/sys/vm/.
> This control can be used to aggressively reclaim memory system-wide
> in one shot from the user space. A value of 1 will instruct the
> kernel to reclaim as much as totalram_pages in the system.
> Example: echo 1 > /proc/sys/vm/shrink_memory
> 
> 2. Enable shrink_all_memory API in kernel with new CONFIG_SHRINK_MEMORY.
> Currently, shrink_all_memory function is used only during hibernation.
> With the new config we can make use of this API for non-hibernation case
> also without disturbing the hibernation case.
> 
> The detailed paper was presented in Embedded Linux Conference, Mar-2015
> http://events.linuxfoundation.org/sites/events/files/slides/
> %5BELC-2015%5D-System-wide-Memory-Defragmenter.pdf
> 
> Scenarios were this can be used and helpful are:
> 1) Can be invoked just after system boot-up is finished.
> 2) Can be invoked just before entering entire system suspend.
> 3) Can be invoked from kernel when order-4 pages starts failing.
> 4) Can be helpful to completely avoid or delay the kerenl OOM condition.
> 5) Can be developed as a system-tool to quickly defragment entire system
>    from user space, without the need to kill any application.
> 

Hi Pintu,

How about increase min_free_kbytes and Android lowmemorykiller's level?

Thanks,
Xishi Qiu

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