linux-kernel - [PATCH 0/4] NR_CPUS: non-x86 arch specific reduction of NR

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Message-Id: <20080208233738.108449000@polaris-admin.engr.sgi.com>
Date:	Fri, 08 Feb 2008 15:37:38 -0800
From:	Mike Travis <travis@....com>
To:	Andrew Morton <akpm@...ux-foundation.org>,
	Ingo Molnar <mingo@...e.hu>,
	Thomas Gleixner <tglx@...utronix.de>, Andi Kleen <ak@...e.de>
Cc:	Christoph Lameter <clameter@....com>,
	Jack Steiner <steiner@....com>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH 0/4] NR_CPUS: non-x86 arch specific reduction of NR_CPUS usage


Here's another round of removing static allocations of arrays
using NR_CPUS to size the length.  The change is to use PER_CPU
variables in place of the static tables.

Based on linux-2.6.git + x86.git

Cc: Dave Jones <davej@...emonkey.org.uk>
Cc: cpufreq@...ts.linux.org.uk
Cc: Len Brown <len.brown@...el.com>
Cc: linux-acpi@...r.kernel.org
Cc: Philippe Elie <phil.el@...adoo.fr>
Cc: oprofile-list@...ts.sf.net

Signed-off-by: Mike Travis <travis@....com>
---
(1 - if modules enabled, does not complete boot even
     without this patch)

x86_64 configs built and booted:

    ingo-stress-test(1)
    defconfi
    nonuma
    nosmp
    bigsmp (NR_CPUS=1024, 1024 possible, 8 real)

Other configs built:

    arm-default
    i386-default
    i386-single
    i386-smp
    ppc-pmac32
    ppc-smp
    sparc64-default
    sparc64-smp
    x86_64-8psmp
    x86_64-debug
    x86_64-default
    x86_64-numa
    x86_64-single
    x86_64-allmodconfig
    x86_64-allyesconfig
    x86_64-maxsmp (NR_CPUS=4096 MAXNODES=512)

Configs not built due to prior errors:

    ia64-sn2
    ia64-default
    ia64-nosmp
    ia64-zx1
    s390-default
    sparc-default

Memory effects using x86_64-maxsmp

    Removes 1MB from permanant data adding 440 bytes to percpu area.

4k-cpus-before                      4k-cpus-after
   3463036 .bss                         -98304 -2%
   6067456 .data.cacheline_alig       -1048576 -17%
     48712 .data.percpu                   +440 +0%
  14275505 .text                          +336 +0%

  14275505 Text                           +336 +0%
   8521495 Data                           -336 +0%
   3463036 Bss                          -98304 -2%
  10974520 OtherData                  -1048576 -9%
     48712 PerCpu                         +440 +0%
  39275796 Total                      -1146104 -2%

-- 
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