Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754260AbbGFKYD (ORCPT ); Mon, 6 Jul 2015 06:24:03 -0400 Received: from szxga02-in.huawei.com ([119.145.14.65]:54542 "EHLO szxga02-in.huawei.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754011AbbGFKX7 (ORCPT ); Mon, 6 Jul 2015 06:23:59 -0400 Message-ID: <559A56FD.6010701@huawei.com> Date: Mon, 6 Jul 2015 18:22:53 +0800 From: Xishi Qiu User-Agent: Mozilla/5.0 (Windows NT 6.1; rv:12.0) Gecko/20120428 Thunderbird/12.0.1 MIME-Version: 1.0 To: Pintu Kumar CC: , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , 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 X-Originating-IP: [10.177.25.179] X-CFilter-Loop: Reflected Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1652 Lines: 39 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 from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/