From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from psmtp.com (na3sys010amx124.postini.com [74.125.245.124]) by kanga.kvack.org (Postfix) with SMTP id 1BFB86B005C for ; Sun, 7 Apr 2013 21:51:42 -0400 (EDT) Received: by mail-ob0-f174.google.com with SMTP id wm15so2675990obc.19 for ; Sun, 07 Apr 2013 18:51:41 -0700 (PDT) Message-ID: <516222A7.7020407@gmail.com> Date: Mon, 08 Apr 2013 09:51:35 +0800 From: Simon Jeons MIME-Version: 1.0 Subject: Re: [RFC] mm: remove swapcache page early References: <1364350932-12853-1-git-send-email-minchan@kernel.org> <515ADFCF.4010209@gmail.com> <51611F94.7060801@gmail.com> <20130408014845.GB6394@blaptop> In-Reply-To: <20130408014845.GB6394@blaptop> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Sender: owner-linux-mm@kvack.org List-ID: To: Minchan Kim Cc: Hugh Dickins , Andrew Morton , linux-mm@kvack.org, linux-kernel@vger.kernel.org, Dan Magenheimer , Seth Jennings , Nitin Gupta , Konrad Rzeszutek Wilk , Shaohua Li , Kamezawa Hiroyuki On 04/08/2013 09:48 AM, Minchan Kim wrote: > Hello Simon, > > On Sun, Apr 07, 2013 at 03:26:12PM +0800, Simon Jeons wrote: >> Ping Minchan. >> On 04/02/2013 09:40 PM, Simon Jeons wrote: >>> Hi Hugh, >>> On 03/28/2013 05:41 AM, Hugh Dickins wrote: >>>> On Wed, 27 Mar 2013, Minchan Kim wrote: >>>> >>>>> Swap subsystem does lazy swap slot free with expecting the page >>>>> would be swapped out again so we can't avoid unnecessary write. >>>> so we can avoid unnecessary write. >>> If page can be swap out again, which codes can avoid unnecessary >>> write? Could you point out to me? Thanks in advance. ;-) > Look at shrink_page_list. > > 1) PageAnon(page) && !PageSwapCache() > 2) add_to_swap's SetPageDirty > 3) __remove_mapping > > P.S) > It seems you are misunderstanding. Here isn't proper place to ask a > question for your understanding the code. As I know, there are some > project(ex, kernelnewbies) and books for study and sharing the > knowledge linux kernel. > > I recommend Mel's "Understand the Linux Virtual Memory Manager". > It's rather outdated but will be very helpful to understand VM of > linux kernel. You can get it freely but I hope you pay for. > So if author become a billionaire by selecting best book in Amazon, > he might print out second edition which covers all of new VM features > and may solve all of you curiosity. > > It would be a another method to contribute open source project. :) > > I believe you talented developers can catch it up with reading the > code enoughly and find more bonus knowledge. I think it's why our senior > developers yell out RTFM and I follow them. What's the meaning of RTFM? > > Cheers! > > -- 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