Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932440AbWARKkc (ORCPT ); Wed, 18 Jan 2006 05:40:32 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S932444AbWARKkb (ORCPT ); Wed, 18 Jan 2006 05:40:31 -0500 Received: from cantor2.suse.de ([195.135.220.15]:15841 "EHLO mx2.suse.de") by vger.kernel.org with ESMTP id S932440AbWARKkb (ORCPT ); Wed, 18 Jan 2006 05:40:31 -0500 From: Nick Piggin To: Linux Memory Management , Linux Kernel Mailing List Cc: Hugh Dickins , Andrew Morton , Andrea Arcangeli , Nick Piggin , Linus Torvalds , David Miller Message-Id: <20060118024106.10241.69438.sendpatchset@linux.site> Subject: [patch 0/4] mm: de-skew page refcount Date: Wed, 18 Jan 2006 11:40:25 +0100 (CET) Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 779 Lines: 20 The following patchset (against 2.6.16-rc1 + migrate race fixes) uses the new atomic ops to do away with the offset page refcounting, and simplify the race that it was designed to cover. This allows some nice optimisations, and in the page freeing path we end up saving 2 atomic ops including a spin_lock_irqsave in the !PageLRU case, and 1 or 2 atomic ops in the PageLRU case. Andrew's previous feedback has been incorporated (less BUG_ONs in fastpaths and more detail in changelogs). Anyone spot any holes or races? Thanks, Nick - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/