Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932753AbXECIrb (ORCPT ); Thu, 3 May 2007 04:47:31 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S965513AbXECIrb (ORCPT ); Thu, 3 May 2007 04:47:31 -0400 Received: from extu-mxob-1.symantec.com ([216.10.194.28]:36694 "EHLO extu-mxob-1.symantec.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932753AbXECIra (ORCPT ); Thu, 3 May 2007 04:47:30 -0400 Date: Thu, 3 May 2007 09:46:32 +0100 (BST) From: Hugh Dickins X-X-Sender: hugh@blonde.wat.veritas.com To: Andrew Morton cc: Christoph Lameter , linux-kernel@vger.kernel.org, linux-mm@kvack.org Subject: Re: 2.6.22 -mm merge plans: slub In-Reply-To: <20070503011515.0d89082b.akpm@linux-foundation.org> Message-ID: References: <20070430162007.ad46e153.akpm@linux-foundation.org> <20070501125559.9ab42896.akpm@linux-foundation.org> <20070503011515.0d89082b.akpm@linux-foundation.org> MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII X-OriginalArrivalTime: 03 May 2007 08:46:48.0613 (UTC) FILETIME=[96491550:01C78D5F] X-Brightmail-Verdict: VlJEQwAAAAIAAAABAAAAAAAAAAEAAAAAAAAABGluYm94AGxpbnV4LWtlcm5lbEB2Z2VyLmtlcm5lbC5vcmcAYWtwbUBsaW51eC1mb3VuZGF0aW9uLm9yZwBjbGFtZXRlckBzZ2kuY29tAGxpbnV4LW1tQGt2YWNrLm9yZwA= X-Brightmail-Tracker: AAAAAA== Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1499 Lines: 38 On Thu, 3 May 2007, Andrew Morton wrote: > On Wed, 2 May 2007 10:25:47 -0700 (PDT) Christoph Lameter wrote: > > > +config ARCH_USES_SLAB_PAGE_STRUCT > > + bool > > + default y > > + depends on SPLIT_PTLOCK_CPUS <= NR_CPUS > > + > > That all seems to work as intended. > > However with NR_CPUS=8 SPLIT_PTLOCK_CPUS=4, enabling SLUB=y crashes the > machine early in boot. I thought that if that worked as intended, you wouldn't even get the chance to choose SLUB=y? That was how it was working for me (but I realize I didn't try more than make oldconfig). > > Too early for netconsole, no serial console. Wedges up uselessly with > CONFIG_XMON=n, does mysterious repeated uncontrollable exceptions with > CONFIG_XMON=y. This is all fairly typical for a powerpc/G5 crash :( > > However I was able to glimpse some stuff as it flew past. Crash started in > flush_old_exec and ended in pgtable_free_tlb -> kmem_cache_free. I don't know > how to do better than that I'm afraid, unless I'm to hunt down a PCIE serial > card, perhaps. That sounds like what happens when SLUB's pagestruct use meets SPLIT_PTLOCK's pagestruct use. Does your .config really show CONFIG_SLUB=y together with CONFIG_ARCH_USES_SLAB_PAGE_STRUCT=y? Hugh - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/