From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-pa0-f54.google.com (mail-pa0-f54.google.com [209.85.220.54]) by kanga.kvack.org (Postfix) with ESMTP id 398B5280253 for ; Mon, 6 Jul 2015 06:26:09 -0400 (EDT) Received: by pacgz10 with SMTP id gz10so19681196pac.3 for ; Mon, 06 Jul 2015 03:26:09 -0700 (PDT) Received: from szxga02-in.huawei.com (szxga02-in.huawei.com. [119.145.14.65]) by mx.google.com with ESMTPS id vw7si28254446pbc.193.2015.07.06.03.26.04 for (version=TLSv1 cipher=RC4-SHA bits=128/128); Mon, 06 Jul 2015 03:26:07 -0700 (PDT) Message-ID: <559A56FD.6010701@huawei.com> Date: Mon, 6 Jul 2015 18:22:53 +0800 From: Xishi Qiu MIME-Version: 1.0 Subject: Re: [PATCH 1/1] kernel/sysctl.c: Add /proc/sys/vm/shrink_memory feature References: <1435929607-3435-1-git-send-email-pintu.k@samsung.com> In-Reply-To: <1435929607-3435-1-git-send-email-pintu.k@samsung.com> Content-Type: text/plain; charset="ISO-8859-1" Content-Transfer-Encoding: 7bit Sender: owner-linux-mm@kvack.org List-ID: To: Pintu Kumar Cc: corbet@lwn.net, akpm@linux-foundation.org, vbabka@suse.cz, gorcunov@openvz.org, mhocko@suse.cz, emunson@akamai.com, kirill.shutemov@linux.intel.com, standby24x7@gmail.com, hannes@cmpxchg.org, vdavydov@parallels.com, hughd@google.com, minchan@kernel.org, tj@kernel.org, rientjes@google.com, xypron.glpk@gmx.de, dzickus@redhat.com, prarit@redhat.com, ebiederm@xmission.com, rostedt@goodmis.org, uobergfe@redhat.com, paulmck@linux.vnet.ibm.com, iamjoonsoo.kim@lge.com, ddstreet@ieee.org, sasha.levin@oracle.com, koct9i@gmail.com, mgorman@suse.de, cj@linux.com, opensource.ganesh@gmail.com, vinmenon@codeaurora.org, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, linux-pm@vger.kernel.org, cpgs@samsung.com, pintu_agarwal@yahoo.com, vishnu.ps@samsung.com, rohit.kr@samsung.com, iqbal.ams@samsung.com 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 -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org