From mboxrd@z Thu Jan 1 00:00:00 1970 Received: by nz-out-0506.google.com with SMTP id s1so26365nze for ; Tue, 24 Jul 2007 17:59:24 -0700 (PDT) Message-ID: Date: Wed, 25 Jul 2007 10:59:23 +1000 From: "Matthew Hawkins" Subject: Re: [ck] Re: -mm merge plans for 2.6.23 - Completely Fair Swap Prefetch In-Reply-To: MIME-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Content-Disposition: inline References: <20070710013152.ef2cd200.akpm@linux-foundation.org> <200707102015.44004.kernel@kolivas.org> <9a8748490707231608h453eefffx68b9c391897aba70@mail.gmail.com> <46A57068.3070701@yahoo.com.au> <2c0942db0707232153j3670ef31kae3907dff1a24cb7@mail.gmail.com> <46A58B49.3050508@yahoo.com.au> Sender: owner-linux-mm@kvack.org Return-Path: To: Frank Kingswood Cc: ck@vds.kolivas.org, linux-mm@kvack.org List-ID: On 7/25/07, Frank Kingswood wrote: > Nick Piggin wrote: > > > However, if we can improve basic page reclaim where it is obviously > > lacking, that is always preferable. eg: being a highly speculative > > operation, swap prefetch is not great for power efficiency -- but we > > still want laptop users to have a good experience as well, right? > > Maybe we need someone (say, a Redhat engineer) to develop a "Completely > Fair Swap Prefetch"? swap prefetch is disabled by default on laptops. What I like about swap prefetch is that, being completely runtime selectable, it leaves it up to the sysadmin whether they want it or not. A distribution can ask a question at install time (or, better still, since most distributions currently have separate server and desktop installs, just do the appropriate thing depending on what is being installed) and the sysadmin is free to alter that choice any time in the future. They can even set up a cron job to alter it for them at multiple times in the future ;-) -- Matt -- 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