From mboxrd@z Thu Jan 1 00:00:00 1970 Message-ID: <45F61C34.4050700@yahoo.com.au> Date: Tue, 13 Mar 2007 14:36:20 +1100 From: Nick Piggin MIME-Version: 1.0 Subject: Re: Remove page flags for software suspend References: <20070228101403.GA8536@elf.ucw.cz> <200702281813.04643.rjw@sisk.pl> <45E6EEC5.4060902@yahoo.com.au> In-Reply-To: Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit Sender: owner-linux-mm@kvack.org Return-Path: To: Hugh Dickins Cc: "Rafael J. Wysocki" , Christoph Lameter , Pavel Machek , linux-mm@kvack.org List-ID: Sorry to take so long to reply. I was having issues with this account. Hugh Dickins wrote: > On Thu, 1 Mar 2007, Nick Piggin wrote: > >>Let's make sure that no more backdoor page flags get allocated without >>going through the linux-mm list to work out whether we really need it >>or can live without it... > > > On Fri, 2 Mar 2007, Nick Piggin wrote: > >>I need one bit for lockless pagecache ;) > > > Is that still your PageNoNewRefs thing? Yes. > What was wrong with my atomic_cmpxchg suggestion? It is a very good suggestion. I think I ran into an issue where I had wanted to set PG_nonewrefs for a page with an elevated refcount or some other issue like that. Can't remember exactly -- I think it is fixable by reworking some code, but I had wanted to do taht as a subsequent patch. -- SUSE Labs, Novell Inc. Send instant messages to your online friends http://au.messenger.yahoo.com -- 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