From mboxrd@z Thu Jan 1 00:00:00 1970 Date: Fri, 21 Dec 2007 11:23:29 +0100 From: Nick Piggin Subject: Re: [rfc][patch 2/2] xip: support non-struct page memory Message-ID: <20071221102329.GC28484@wotan.suse.de> References: <20071214133817.GB28555@wotan.suse.de> <20071214134106.GC28555@wotan.suse.de> <476A73F0.4070704@de.ibm.com> <476A7D21.7070607@de.ibm.com> <476A8133.5050809@de.ibm.com> <20071221005049.GC31040@wotan.suse.de> <476B8F2B.7010409@de.ibm.com> <20071221101419.GA28484@wotan.suse.de> <476B92AA.4020805@de.ibm.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <476B92AA.4020805@de.ibm.com> Sender: owner-linux-mm@kvack.org Return-Path: To: carsteno@de.ibm.com Cc: Jared Hulbert , Linux Memory Management List , Martin Schwidefsky List-ID: On Fri, Dec 21, 2007 at 11:17:14AM +0100, Carsten Otte wrote: > Nick Piggin wrote: > >I thought s390 was short on OS-available pte bits. There are a couple of > >other > >nice things to use them for, so I'd rather not for this if possible (it is > >not so critical if you can use a list, I would have thought) > OS-available bits are only short for invalid ptes. For valid ptes > however, there are quite a few spare. OK, that's good news for my lockless get_user_pages ;) And also potentially good news for the whole vm_normal_page scheme... though I'd prefer to start simple (ie. don't use the pte bit, rather walk the list), and see if it works first. But whatever you think I guess, either way it would go in arch specific code where your opinion outweighs mine ;) -- 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