From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754098AbaFQBWX (ORCPT ); Mon, 16 Jun 2014 21:22:23 -0400 Received: from szxga02-in.huawei.com ([119.145.14.65]:44465 "EHLO szxga02-in.huawei.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752388AbaFQBWW (ORCPT ); Mon, 16 Jun 2014 21:22:22 -0400 Message-ID: <539F97E8.6070607@huawei.com> Date: Tue, 17 Jun 2014 09:20:40 +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: Randy Dunlap CC: Andrew Morton , Wanpeng Li , Greg Kroah-Hartman , , Peter Zijlstra , Rik van Riel , Johannes Weiner , Michal Hocko , Linux MM , LKML , Li Zefan Subject: Re: [PATCH 8/8] doc: update Documentation/sysctl/vm.txt References: <539EB803.9070001@huawei.com> <539F21F4.20206@infradead.org> In-Reply-To: <539F21F4.20206@infradead.org> 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 On 2014/6/17 0:57, Randy Dunlap wrote: > On 06/16/14 02:25, Xishi Qiu wrote: >> Update the doc. >> >> Signed-off-by: Xishi Qiu >> --- >> Documentation/sysctl/vm.txt | 43 +++++++++++++++++++++++++++++++++++++++++++ >> 1 files changed, 43 insertions(+), 0 deletions(-) >> >> diff --git a/Documentation/sysctl/vm.txt b/Documentation/sysctl/vm.txt >> index dd9d0e3..8008e53 100644 >> --- a/Documentation/sysctl/vm.txt >> +++ b/Documentation/sysctl/vm.txt >> @@ -20,6 +20,10 @@ Currently, these files are in /proc/sys/vm: >> >> - admin_reserve_kbytes >> - block_dump >> +- cache_limit_mbytes >> +- cache_limit_ratio >> +- cache_reclaim_s >> +- cache_reclaim_weight >> - compact_memory >> - dirty_background_bytes >> - dirty_background_ratio >> @@ -97,6 +101,45 @@ information on block I/O debugging is in Documentation/laptops/laptop-mode.txt. >> >> ============================================================== >> >> +cache_limit_mbytes >> + >> +This is used to limit page cache amount. The input unit is MB, value range >> +is from 0 to totalram_pages. If this is set to 0, it will not limit page cache. > > Where does one find the value of totalram_pages? > "cat /proc/meminfo | grep MemTotal" or "free -m" > Is totalram_pages in MB or does totalram_pages need to be divided by some value > to convert it to MB? > Yes, should convert it to MB. Thanks, Xishi Qiu >> +When written to the file, cache_limit_ratio will be updated too. >> + >> +The default value is 0. >> + >> +============================================================== >> + >> +cache_limit_ratio >> + >> +This is used to limit page cache amount. The input unit is percent, value >> +range is from 0 to 100. If this is set to 0, it will not limit page cache. >> +When written to the file, cache_limit_mbytes will be updated too. >> + >> +The default value is 0. >> + >> +============================================================== >> + >> +cache_reclaim_s >> + >> +This is used to reclaim page cache in circles. The input unit is second, >> +the minimum value is 0. If this is set to 0, it will disable the feature. >> + >> +The default value is 0. >> + >> +============================================================== >> + >> +cache_reclaim_weight >> + >> +This is used to speed up page cache reclaim. It depend on enabling > > depends on > >> +cache_limit_mbytes/cache_limit_ratio or cache_reclaim_s. Value range is >> +from 1(slow) to 100(fast). >> + >> +The default value is 1. >> + >> +============================================================== >> + >> compact_memory >> >> Available only when CONFIG_COMPACTION is set. When 1 is written to the file, >> > >