From mboxrd@z Thu Jan 1 00:00:00 1970 Date: Thu, 5 Jan 2006 08:32:19 -0500 (EST) From: Rik van Riel Subject: Re: [PATCH 6/9] clockpro-clockpro.patch In-Reply-To: <20060105094722.897C574030@sv1.valinux.co.jp> Message-ID: References: <20051230223952.765.21096.sendpatchset@twins.localnet> <20051230224312.765.58575.sendpatchset@twins.localnet> <20051231002417.GA4913@dmt.cnet> <1136028546.17853.69.camel@twins> <20060105094722.897C574030@sv1.valinux.co.jp> MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: owner-linux-mm@kvack.org Return-Path: To: IWAMOTO Toshihiro Cc: Peter Zijlstra , Marcelo Tosatti , linux-mm@kvack.org, linux-kernel@vger.kernel.org, Andrew Morton , Christoph Lameter , Wu Fengguang , Nick Piggin , Marijn Meijles List-ID: On Thu, 5 Jan 2006, IWAMOTO Toshihiro wrote: > Is it okay to allow Hcold to lap Hhot? I think it should be fine for Hcold to overtake Hhot, or the other way around. > In my understanding of CLOCK-Pro, such lapping causes sudden increase > in the distance between Hhot and Hcold. As that distance is an > important parameter of page aging/replacement decisions, I'm afraid > that such lapping would result in incorrect page aging and bad > performance. Hcold only manipulates cold pages, Hhot only manipulates hot pages and the test bit on cold pages. Having one hand overtake the other should not disturb things at all, since they both do something different. -- All Rights Reversed -- 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