Hi, > -----Original Message----- > From: Xishi Qiu [mailto:qiuxi...@huawei.com] > Sent: Monday, July 06, 2015 3:53 PM > To: Pintu Kumar > Cc: cor...@lwn.net; a...@linux-foundation.org; vba...@suse.cz; > gorcu...@openvz.org; mho...@suse.cz; emun...@akamai.com; > kirill.shute...@linux.intel.com; standby2...@gmail.com; > han...@cmpxchg.org; vdavy...@parallels.com; hu...@google.com; > minc...@kernel.org; t...@kernel.org; rient...@google.com; > xypron.g...@gmx.de; dzic...@redhat.com; pra...@redhat.com; > ebied...@xmission.com; rost...@goodmis.org; uober...@redhat.com; > paul...@linux.vnet.ibm.com; iamjoonsoo....@lge.com; ddstr...@ieee.org; > sasha.le...@oracle.com; koc...@gmail.com; mgor...@suse.de; c...@linux.com; > opensource.gan...@gmail.com; vinme...@codeaurora.org; linux- > d...@vger.kernel.org; linux-kernel@vger.kernel.org; linux...@kvack.org; linux- > p...@vger.kernel.org; c...@samsung.com; pintu_agar...@yahoo.com; > vishnu...@samsung.com; rohit...@samsung.com; iqbal....@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 from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
