From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from psmtp.com (na3sys010amx120.postini.com [74.125.245.120]) by kanga.kvack.org (Postfix) with SMTP id 3CB276B0005 for ; Fri, 8 Mar 2013 21:14:23 -0500 (EST) Received: by mail-ia0-f169.google.com with SMTP id j5so2092383iaf.28 for ; Fri, 08 Mar 2013 18:14:22 -0800 (PST) Message-ID: <513A9AF7.4020909@gmail.com> Date: Sat, 09 Mar 2013 10:14:15 +0800 From: Will Huck MIME-Version: 1.0 Subject: Re: Inactive memory keep growing and how to release it? References: <51347A6E.8010608@iskon.hr> In-Reply-To: Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Sender: owner-linux-mm@kvack.org List-ID: To: Lenky Gao Cc: Zlatko Calusic , Greg KH , "linux-kernel@vger.kernel.org" , "devel@linuxdriverproject.org" , "olaf@aepfle.de" , "apw@canonical.com" , "andi@firstfloor.org" , "akpm@linux-foundation.org" , "linux-mm@kvack.org" , Hugh Dickins , Johannes Weiner Cc experts. Hugh, Johannes, On 03/04/2013 08:21 PM, Lenky Gao wrote: > 2013/3/4 Zlatko Calusic : >> The drop_caches mechanism doesn't free dirty page cache pages. And your bash >> script is creating a lot of dirty pages. Run it like this and see if it >> helps your case: >> >> sync; echo 3 > /proc/sys/vm/drop_caches > Thanks for your advice. > > The inactive memory still cannot be reclaimed after i execute the sync command: > > # cat /proc/meminfo | grep Inactive\(file\); > Inactive(file): 882824 kB > # sync; > # echo 3 > /proc/sys/vm/drop_caches > # cat /proc/meminfo | grep Inactive\(file\); > Inactive(file): 777664 kB > > I find these page becomes orphaned in this function, but do not understand why: > > /* > * If truncate cannot remove the fs-private metadata from the page, the page > * becomes orphaned. It will be left on the LRU and may even be mapped into > * user pagetables if we're racing with filemap_fault(). > * > * We need to bale out if page->mapping is no longer equal to the original > * mapping. This happens a) when the VM reclaimed the page while we waited on > * its lock, b) when a concurrent invalidate_mapping_pages got there first and > * c) when tmpfs swizzles a page between a tmpfs inode and swapper_space. > */ > static int > truncate_complete_page(struct address_space *mapping, struct page *page) > { > ... > > My file system type is ext3, mounted with the opteion data=journal and > it is easy to reproduce. > > -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org