From mboxrd@z Thu Jan 1 00:00:00 1970 Date: Wed, 25 Jul 2007 01:33:45 -0700 (PDT) From: david@lang.hm Subject: Re: -mm merge plans for 2.6.23 In-Reply-To: Message-ID: 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> <2c0942db0707240915h56e007e3l9110e24a065f2e73@mail.gmail.com> <46A7031D.5080300@gmail.com> <46A709DC.4080501@gmail.com> MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII; format=flowed Sender: owner-linux-mm@kvack.org Return-Path: To: Rene Herman Cc: Ray Lee , Nick Piggin , Jesper Juhl , Andrew Morton , ck list , Ingo Molnar , Paul Jackson , linux-mm@kvack.org, linux-kernel@vger.kernel.org List-ID: On Wed, 25 Jul 2007, david@lang.hm wrote: > Subject: Re: -mm merge plans for 2.6.23 > > On Wed, 25 Jul 2007, Rene Herman wrote: > >> On 07/25/2007 10:07 AM, david@lang.hm wrote: >> >> > On Wed, 25 Jul 2007, Rene Herman wrote: >> >> > > Something like this? >> >> [ ... ] >> >> > when the swap readahead is enabled does it make a significant >> > difference >> > in the time to do the random access? >> >> I don't use swap prefetch (nor -ck or -mm). If someone who has the patch >> applied waits to hit enter until swap prefetch has prefetched it all back >> in again, it certainly will. >> >> Swap prefetch's potential to do larger reads back from swapspace than a >> random segfaulting app could well be very significant. Reads are dwarved >> by seeks. If this program does what you wanted, please use it to show us. > > I haven't used swap prefetch either, the call was put out for what could be > used to test the performance, and I was suggesting a test. > > if nobody else follows up on this I'll try to get some time to test it myself > in a day or two. this assumes that this isn't ruled an invalid test in the meantime. in any case thanks for codeing this up so quickly. David Lang -- 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