Messages in this thread | | | From | PINTU KUMAR <> | Subject | RE: [PATCH 1/1] kernel/sysctl.c: Add /proc/sys/vm/shrink_memory feature | Date | Mon, 06 Jul 2015 19:33:36 +0530 |
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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
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