From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S262102AbVF1QDe (ORCPT ); Tue, 28 Jun 2005 12:03:34 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S262110AbVF1QDe (ORCPT ); Tue, 28 Jun 2005 12:03:34 -0400 Received: from e35.co.us.ibm.com ([32.97.110.133]:30915 "EHLO e35.co.us.ibm.com") by vger.kernel.org with ESMTP id S262102AbVF1QDb (ORCPT ); Tue, 28 Jun 2005 12:03:31 -0400 Subject: Re: [patch 2] mm: speculative get_page From: Dave Hansen To: Nick Piggin Cc: Andy Whitcroft , linux-kernel , Linux Memory Management In-Reply-To: <42C14D93.7090303@yahoo.com.au> References: <42BF9CD1.2030102@yahoo.com.au> <42BF9D67.10509@yahoo.com.au> <42BF9D86.90204@yahoo.com.au> <42C14662.40809@shadowen.org> <42C14D93.7090303@yahoo.com.au> Content-Type: text/plain Date: Tue, 28 Jun 2005 09:02:46 -0700 Message-Id: <1119974566.14830.111.camel@localhost> Mime-Version: 1.0 X-Mailer: Evolution 2.0.4 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org On Tue, 2005-06-28 at 23:16 +1000, Nick Piggin wrote: > I think there are a a few ways that bits can be reclaimed if we > start digging. swsusp uses 2 which seems excessive though may be > fully justified. They (swsusp) actually don't need the bits at all until suspend-time, at all. Somebody coded up a "dynamic page flags" patch that let them kill the page->flags use, but it didn't really go anywhere. Might be nice if someone dug it up. I probably have a copy somewhere. -- Dave