linux-kernel - Re: [PATCH 0/1] x86: Convert cpuinfo_x86 array to a per

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Date:	Tue, 16 Oct 2007 01:18:27 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	travis@....com
Cc:	Andi Kleen <ak@...e.de>, Christoph Lameter <clameter@....com>,
	Jack Steiner <steiner@....com>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/1] x86: Convert cpuinfo_x86 array to a per_cpu array
 v3

On Mon, 24 Sep 2007 14:08:53 -0700 travis@....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.


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