From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-pd0-f171.google.com (mail-pd0-f171.google.com [209.85.192.171]) by kanga.kvack.org (Postfix) with ESMTP id 513FF2802AF for ; Mon, 6 Jul 2015 10:06:25 -0400 (EDT) Received: by pdbci14 with SMTP id ci14so106690667pdb.2 for ; Mon, 06 Jul 2015 07:06:25 -0700 (PDT) Received: from mailout1.samsung.com (mailout1.samsung.com. [203.254.224.24]) by mx.google.com with ESMTPS id et9si29231228pac.230.2015.07.06.07.06.23 for (version=TLSv1 cipher=RC4-SHA bits=128/128); Mon, 06 Jul 2015 07:06:24 -0700 (PDT) Received: from epcpsbgr3.samsung.com (u143.gpu120.samsung.co.kr [203.254.230.143]) by mailout1.samsung.com (Oracle Communications Messaging Server 7.0.5.31.0 64bit (built May 5 2014)) with ESMTP id <0NR200J2CKIM5580@mailout1.samsung.com> for linux-mm@kvack.org; Mon, 06 Jul 2015 23:06:22 +0900 (KST) From: PINTU KUMAR References: <1435929607-3435-1-git-send-email-pintu.k@samsung.com> <559A56FD.6010701@huawei.com> In-reply-to: <559A56FD.6010701@huawei.com> Subject: RE: [PATCH 1/1] kernel/sysctl.c: Add /proc/sys/vm/shrink_memory feature Date: Mon, 06 Jul 2015 19:33:36 +0530 Message-id: <0ffe01d0b7f4$dd2706d0$97751470$@samsung.com> MIME-version: 1.0 Content-type: text/plain; charset=us-ascii Content-transfer-encoding: 7bit Content-language: en-us Sender: owner-linux-mm@kvack.org List-ID: To: 'Xishi Qiu' 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 Hi, > -----Original Message----- > From: Xishi Qiu [mailto:qiuxishi@huawei.com] > Sent: Monday, July 06, 2015 3:53 PM > 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 > 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 for the review. Actually in Tizen, we don't use Android LMK and we wanted to delay the LMK with aggressive direct_reclaim offline. And increasing min_free value also may not help much. Currently, in our case free memory never falls below 10MB, with 512MB RAM configuration. > 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