From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755586AbaFPQ5k (ORCPT ); Mon, 16 Jun 2014 12:57:40 -0400 Received: from bombadil.infradead.org ([198.137.202.9]:60964 "EHLO bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751349AbaFPQ5j (ORCPT ); Mon, 16 Jun 2014 12:57:39 -0400 Message-ID: <539F21F4.20206@infradead.org> Date: Mon, 16 Jun 2014 09:57:24 -0700 From: Randy Dunlap User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:24.0) Gecko/20100101 Thunderbird/24.5.0 MIME-Version: 1.0 To: Xishi Qiu , Andrew Morton , Wanpeng Li , Greg Kroah-Hartman , aquini@redhat.com, Peter Zijlstra , Rik van Riel , Johannes Weiner , Michal Hocko CC: Linux MM , LKML , Li Zefan Subject: Re: [PATCH 8/8] doc: update Documentation/sysctl/vm.txt References: <539EB803.9070001@huawei.com> In-Reply-To: <539EB803.9070001@huawei.com> Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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? Is totalram_pages in MB or does totalram_pages need to be divided by some value to convert it to MB? > +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, > -- ~Randy