From mboxrd@z Thu Jan 1 00:00:00 1970 Date: Tue, 12 Sep 2000 11:24:38 +0100 From: "Stephen C. Tweedie" Subject: Re: [PATCH] workaround for lost dirty bits on x86 SMP Message-ID: <20000912112438.C28418@redhat.com> References: <200009120059.RAA78304@google.engr.sgi.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: ; from bcrl@redhat.com on Mon, Sep 11, 2000 at 09:36:35PM -0400 Sender: owner-linux-mm@kvack.org Return-Path: To: bcrl@redhat.com Cc: Kanoj Sarcar , linux-mm@kvack.org, torvalds@transmeta.com List-ID: Hi, On Mon, Sep 11, 2000 at 09:36:35PM -0400, bcrl@redhat.com wrote: > Fwiw, with the patch, running a make -j bzImage on a 4 way box does not > seem to have made a difference. Of course it won't, because you aren't testing the new behaviour! Anonymous pages are always dirty, and shared mmaped pages in MAP_PRIVATE regions are always clean. The only place where you need to track the dirty bit dynamically is when you use shared writeable mmaps --- can you measure a performance change there? Cheers, Stephen -- 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.eu.org/Linux-MM/