From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932181AbYDVUms (ORCPT ); Tue, 22 Apr 2008 16:42:48 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1755304AbYDVUmW (ORCPT ); Tue, 22 Apr 2008 16:42:22 -0400 Received: from relay1.sgi.com ([192.48.171.29]:37996 "EHLO relay.sgi.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1754881AbYDVUmV (ORCPT ); Tue, 22 Apr 2008 16:42:21 -0400 Message-Id: <20080422204219.994283000@polaris-admin.engr.sgi.com> User-Agent: quilt/0.46-1 Date: Tue, 22 Apr 2008 13:42:19 -0700 From: Mike Travis To: Ingo Molnar Cc: Andrew Morton , Thomas Gleixner , "H. Peter Anvin" , linux-kernel@vger.kernel.org Subject: [PATCH 0/5] x86: cleanup early per cpu variables/accesses v4-folded Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org * Increase the limit of NR_CPUS to 4096 and introduce a boolean called "MAXSMP" which when set (e.g. "allyesconfig"), will set NR_CPUS = 4096 and NODES_SHIFT = 9 (512). Changed max setting for NODES_SHIFT from 15 to 9 to accurately reflect the real limit. * Introduce a new PER_CPU macro called "EARLY_PER_CPU". This is used by some per_cpu variables that are initialized and accessed before there are per_cpu areas allocated. * Add a flag "arch_provides_topology_pointers" that indicates pointers to topology cpumask_t maps are available. Otherwise, use the function returning the cpumask_t value. This is useful if cpumask_t set size is very large to avoid copying data on to/off of the stack. * Consolidate node_to_cpumask operations and remove the 256k byte node_to_cpumask_map. This is done by allocating the node_to_cpumask_map array after the number of possible nodes (nr_node_ids) is known. * Restore the nodenumber field in the x86_64 pda. This field is slightly different than the x86_cpu_to_node_map mainly because it's a static indication of which node the cpu is on while the cpu to node map is a dyanamic mapping that may get reset if the cpu goes offline. This also simplifies the numa_node_id() macro. * Replace usages of MAX_NUMNODES with nr_node_ids in kernel/sched.c, where appropriate. This saves some allocated space as well as many wasted cycles going through node entries that are non-existent. For inclusion into sched-devel/latest tree. Based on: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6.git + sched-devel/latest .../mingo/linux-2.6-sched-devel.git Signed-off-by: Mike Travis --- v4-folded: Folded in Kconfig changes to increase NR_CPU limit to 4096 and add new config option MAXSMP. v3-folded: Folded in follow on "fix" patches to consolidate changes into one place. Includes change to drivers/base/topology.c to fix s390 build error. Includes change to fix preemption warning when numa_node_id is used. checkpatch.pl errors/warnings checked and fixed where possible. v2: remerged PATCH 2/2 with latest x86.git/latest and sched-devel/latest, rebuilt and retested 4k-akpm2, 4k-defconfig, nonuma, & nosmp configs. --