Hi, > -----Original Message----- > From: Xishi Qiu [mailto:qiuxishi@xxxxxxxxxx] > Sent: Monday, July 06, 2015 3:53 PM > To: Pintu Kumar > Cc: corbet@xxxxxxx; akpm@xxxxxxxxxxxxxxxxxxxx; vbabka@xxxxxxx; > gorcunov@xxxxxxxxxx; mhocko@xxxxxxx; emunson@xxxxxxxxxx; > kirill.shutemov@xxxxxxxxxxxxxxx; standby24x7@xxxxxxxxx; > hannes@xxxxxxxxxxx; vdavydov@xxxxxxxxxxxxx; hughd@xxxxxxxxxx; > minchan@xxxxxxxxxx; tj@xxxxxxxxxx; rientjes@xxxxxxxxxx; > xypron.glpk@xxxxxx; dzickus@xxxxxxxxxx; prarit@xxxxxxxxxx; > ebiederm@xxxxxxxxxxxx; rostedt@xxxxxxxxxxx; uobergfe@xxxxxxxxxx; > paulmck@xxxxxxxxxxxxxxxxxx; iamjoonsoo.kim@xxxxxxx; ddstreet@xxxxxxxx; > sasha.levin@xxxxxxxxxx; koct9i@xxxxxxxxx; mgorman@xxxxxxx; cj@xxxxxxxxx; > opensource.ganesh@xxxxxxxxx; vinmenon@xxxxxxxxxxxxxx; linux- > doc@xxxxxxxxxxxxxxx; linux-kernel@xxxxxxxxxxxxxxx; linux-mm@xxxxxxxxx; linux- > pm@xxxxxxxxxxxxxxx; cpgs@xxxxxxxxxxx; pintu_agarwal@xxxxxxxxx; > vishnu.ps@xxxxxxxxxxx; rohit.kr@xxxxxxxxxxx; iqbal.ams@xxxxxxxxxxx > 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@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>