From mboxrd@z Thu Jan 1 00:00:00 1970 Date: Tue, 16 Oct 2007 01:18:27 -0700 From: Andrew Morton Subject: Re: [PATCH 0/1] x86: Convert cpuinfo_x86 array to a per_cpu array v3 Message-Id: <20071016011827.91350174.akpm@linux-foundation.org> In-Reply-To: <20070924210853.256462000@sgi.com> References: <20070924210853.256462000@sgi.com> Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: owner-linux-mm@kvack.org Return-Path: To: travis@sgi.com Cc: Andi Kleen , Christoph Lameter , Jack Steiner , linux-mm@kvack.org, linux-kernel@vger.kernel.org List-ID: On Mon, 24 Sep 2007 14:08:53 -0700 travis@sgi.com wrote: > > v3: fix compile errors in arch-i386-allmodconfig build > > v2: rebasing on 2.6.23-rc6-mm1 > > Analyzing various data structures when NR_CPU count is raised > to 4096 shows the following arrays over 128k. If the maximum > number of cpus are not installed (about 99.99% of the time), > then a large percentage of this memory is wasted. > -- > 151289856 CALNDATA irq_desc > 135530496 RMDATATA irq_cfg > 3145728 CALNDATA cpu_data > 2101248 BSS irq_lists > 2097152 RMDATATA cpu_sibling_map > 2097152 RMDATATA cpu_core_map > 1575936 BSS irq_2_pin > 1050624 BSS irq_timer_state > 614400 INITDATA early_node_map > 525376 PERCPU per_cpu__kstat > 524608 DATA unix_proto > 524608 DATA udpv6_prot > 524608 DATA udplitev6_prot > 524608 DATA udplite_prot > 524608 DATA udp_prot > 524608 DATA tcpv6_prot > 524608 DATA tcp_prot > 524608 DATA rawv6_prot > 524608 DATA raw_prot > 524608 DATA packet_proto > 524608 DATA netlink_proto > 524288 BSS cpu_devices > 524288 BSS boot_pageset > 524288 CALNDATA boot_cpu_pda > 262144 RMDATATA node_to_cpumask > 262144 BSS __log_buf > 131072 BSS entries > > cpu_sibling_map and cpu_core_map have been taken care of in > a prior patch. This patch deals with the cpu_data array of > cpuinfo_x86 structs. The model that was used in sparc64 > architecture was adopted for x86. > This has mysteriously started to oops on me, only on x86_64. http://userweb.kernel.org/~akpm/config-x.txt http://userweb.kernel.org/~akpm/dsc00001.jpg which is a bit strange since this patch doesn't touch sched.c. Maybe there's something somewhere else in the -mm lineup which when combined with this prevents it from oopsing, dunno. I'll hold it back for now and will see what happens. -- 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