From mboxrd@z Thu Jan 1 00:00:00 1970 Date: Wed, 07 Sep 2005 07:28:44 -0700 From: "Martin J. Bligh" Reply-To: "Martin J. Bligh" Subject: Re: Hugh's alternate page fault scalability approach on 512p Altix Message-ID: <20660000.1126103324@[10.10.2.4]> In-Reply-To: References: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Content-Disposition: inline Sender: owner-linux-mm@kvack.org Return-Path: To: Christoph Lameter , torvalds@osdl.org Cc: akpm@osdl.org, nickpiggin@yahoo.com.au, hugh@veritas.com, linux-mm@kvack.org, linux-kernel@vger.kernel.org List-ID: > Anticipatory prefaulting raises the highest fault rate obtainable three-fold > through gang scheduling faults but may allocate some pages to a task that are > not needed. IIRC that costed more than it saved, at least for forky workloads like a kernel compile - extra cost in zap_pte_range etc. If things have changed substantially in that path, I guess we could run the numbers again - has been a couple of years. M. -- 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