From mboxrd@z Thu Jan 1 00:00:00 1970 Message-ID: <4212C63D.2050606@sgi.com> Date: Tue, 15 Feb 2005 22:04:13 -0600 From: Ray Bryant MIME-Version: 1.0 Subject: Re: manual page migration -- issue list References: <42128B25.9030206@sgi.com> <20050215165106.61fd4954.pj@sgi.com> <20050215171709.64b155ec.pj@sgi.com> <20050216020138.GC28354@lnx-holt.americas.sgi.com> In-Reply-To: <20050216020138.GC28354@lnx-holt.americas.sgi.com> Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit Sender: owner-linux-mm@kvack.org Return-Path: To: Robin Holt Cc: Paul Jackson , linux-mm@kvack.org, ak@muc.de, haveblue@us.ibm.com, marcello@cyclades.com, stevel@mwwireless.net, peterc@gelato.unsw.edu.au List-ID: Robin Holt wrote: > On Tue, Feb 15, 2005 at 05:17:09PM -0800, Paul Jackson wrote: > >>As a straw man, let me push the factored migration call to the >>extreme, and propose a call: >> >> sys_page_migrate(pid, oldnode, newnode) > > > Go look at the mappings in /proc//maps once and you will see > how painful this can make things. Especially for an applications > with shared mappings. Overlapping nodes with the above will make > a complete mess of your memory placement. > > Robin > -- > 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: aart@kvack.org > So lets address that issue again, since I think that is now the heart of the matter. Exactly why do we need to support the case where the set of old nodes and new nodes overlap? I agree it is more general, but if we drop that, I think we are one step closer to getting agreement as to what the page migration system call interface should be. Do we have a case, say from IRIX, of why supporting this kind of migration is necessary? -- ----------------------------------------------- Ray Bryant 512-453-9679 (work) 512-507-7807 (cell) raybry@sgi.com raybry@austin.rr.com The box said: "Requires Windows 98 or better", so I installed Linux. ----------------------------------------------- -- 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: aart@kvack.org