From mboxrd@z Thu Jan 1 00:00:00 1970 From: Nikita Danilov MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Message-ID: <17532.305.602559.660069@gargle.gargle.HOWL> Date: Tue, 30 May 2006 12:24:17 +0400 Subject: Re: [rfc][patch] remove racy sync_page? In-Reply-To: <447BD63D.2080900@yahoo.com.au> References: <447AC011.8050708@yahoo.com.au> <20060529121556.349863b8.akpm@osdl.org> <447B8CE6.5000208@yahoo.com.au> <20060529183201.0e8173bc.akpm@osdl.org> <447BB3FD.1070707@yahoo.com.au> <447BD31E.7000503@yahoo.com.au> <447BD63D.2080900@yahoo.com.au> Sender: owner-linux-mm@kvack.org Return-Path: To: Nick Piggin Cc: Andrew Morton , linux-kernel@vger.kernel.org, linux-mm@kvack.org, mason@suse.com, andrea@suse.de, hugh@veritas.com, axboe@suse.de List-ID: Nick Piggin writes: > Nick Piggin wrote: > > Linus Torvalds wrote: > > > >> > >> Why do you think the IO layer should get larger requests? > > > > > > For workloads where plugging helps (ie. lots of smaller, contiguous > > requests going into the IO layer), should be pretty good these days > > due to multiple readahead and writeback. > > Let me try again. > > For workloads where plugging helps (ie. lots of smaller, contiguous > requests going into the IO layer), the request pattern should be > pretty good without plugging these days, due to multiple page > readahead and writeback. Pageout by VM scanner doesn't benefit from those, and it is still quite important in some workloads (e.g., mmap intensive). Nikita. -- 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