From mboxrd@z Thu Jan 1 00:00:00 1970 Date: Thu, 3 May 2007 11:37:56 +0100 From: Christoph Hellwig Subject: Re: 2.6.22 -mm merge plans -- vm bugfixes Message-ID: <20070503103756.GA19958@infradead.org> References: <20070430162007.ad46e153.akpm@linux-foundation.org> <4636FDD7.9080401@yahoo.com.au> <4638009E.3070408@yahoo.com.au> <46393BA7.6030106@yahoo.com.au> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <46393BA7.6030106@yahoo.com.au> Sender: owner-linux-mm@kvack.org Return-Path: To: Nick Piggin Cc: Hugh Dickins , Andrew Morton , linux-kernel@vger.kernel.org, linux-mm@kvack.org, Andrea Arcangeli , Christoph Hellwig List-ID: On Thu, May 03, 2007 at 11:32:23AM +1000, Nick Piggin wrote: > The attached patch gets performance up a bit by avoiding some > barriers and some cachelines: > > G5 > pagefault fork exec > 2.6.21 1.49-1.51 164.6-170.8 741.8-760.3 > +patch 1.71-1.73 175.2-180.8 780.5-794.2 > +patch2 1.61-1.63 169.8-175.0 748.6-757.0 > > So that brings the fork/exec hits down to much less than 5%, and > would likely speed up other things that lock the page, like write > or page reclaim. Is that every fork/exec or just under certain cicumstances? A 5% regression on every fork/exec is not acceptable. -- 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