From mboxrd@z Thu Jan 1 00:00:00 1970 From: "Bob Picco" Date: Fri, 5 May 2006 12:22:09 -0400 Subject: Re: assert/crash in __rmqueue() when enabling CONFIG_NUMA Message-ID: <20060505162209.GC5708@localhost> References: <1146756066.22503.17.camel@localhost.localdomain> <20060504154652.GA4530@localhost> <20060504192528.GA26759@elte.hu> <20060504194334.GH19859@localhost> <445A7725.8030401@shadowen.org> <20060505135503.GA5708@localhost> <1146839590.22503.48.camel@localhost.localdomain> <20060505145018.GI19859@localhost> <1146841064.22503.53.camel@localhost.localdomain> <445B6926.20109@mbligh.org> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <445B6926.20109@mbligh.org> Sender: owner-linux-mm@kvack.org Return-Path: To: "Martin J. Bligh" Cc: Dave Hansen , Bob Picco , Andy Whitcroft , Ingo Molnar , Nick Piggin , Andi Kleen , linux-kernel@vger.kernel.org, Andrew Morton , Linux Memory Management List-ID: Martin J. Bligh wrote: [Fri May 05 2006, 11:03:02AM EDT] > >Ahhh. I hadn't made the ia64 connection. I wonder if it is worth > >making CONFIG_HOLES_IN_ZONE say ia64 or something about vmem_map in it > >somewhere. Might be worth at least a comment like this: > > > >+ if (page_in_zone_hole(buddy)) /* noop on all but ia64 */ > >+ break; > >+ else if (page_zonenum(buddy) != page_zonenum(page)) > >+ break; > >+ else if (!page_is_buddy(buddy, order)) > > break; /* Move the buddy up one level. */ > > > >BTW, wasn't the whole idea of discontig to have holes in zones (before > >NUMA) without tricks like this? ;) > > Sparsemem should fix this - that was one of the things Andy designed it > for. Then we can remove the virtual memmap stuff (and discontig). > Indeed, I'd hope we're ready to do that real soon now ... has anyone > got an ia64 box that needed virtual memmap that they could test this > on? > > M. I totally agree about SPARSEMEM. I believe most ia64 boxes use VIRTUAL_MEM_MAP. I only know of Fujitsu and myself that use SPARSEMEM for ia64 (perhaps Andy too in his testing). Dave and I have advocated its use more than once. bob -- 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