From mboxrd@z Thu Jan 1 00:00:00 1970 Date: Tue, 26 Apr 2005 01:55:18 -0700 From: Andrew Morton Subject: Re: [PATCH]: VM 6/8 page_referenced(): move dirty Message-Id: <20050426015518.2df35139.akpm@osdl.org> In-Reply-To: <17006.127.376459.93584@gargle.gargle.HOWL> References: <16994.40677.105697.817303@gargle.gargle.HOWL> <20050425210016.6f8a47d1.akpm@osdl.org> <17006.127.376459.93584@gargle.gargle.HOWL> Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: owner-linux-mm@kvack.org Return-Path: To: Nikita Danilov Cc: linux-mm@kvack.org List-ID: Nikita Danilov wrote: > > > > > I can envision workloads (such as mmap 80% of memory and continuously dirty > > it) which would end up performing continuous I/O with this patch. > > Below is a version that tries to move dirtiness to the struct page only > if we are really going to deactivate the page. In your scenario above, > continuously dirty pages will be on the active list, so it should be > okay. OK, well it'll now increase the amount of I/O by a smaller amount. Trade that off against possibly improved I/O patterns. But how do we know that all this is a net gain? > > > > IOW: I'm gonna drop this one like it's made of lead! > > Let's decrease atomic number by 3. Still heavy. -- 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: aart@kvack.org