lkml.org 
[lkml]   [2008]   [Feb]   [8]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    /
    Date
    From
    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@codemonkey.org.uk>
    Cc: cpufreq@lists.linux.org.uk
    Cc: Len Brown <len.brown@intel.com>
    Cc: linux-acpi@vger.kernel.org
    Cc: Philippe Elie <phil.el@wanadoo.fr>
    Cc: oprofile-list@lists.sf.net

    Signed-off-by: Mike Travis <travis@sgi.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%

    --


    \
     
     \ /
      Last update: 2008-02-09 00:41    [W:0.019 / U:4.460 seconds]
    ©2003-2017 Jasper Spaans. hosted at Digital OceanAdvertise on this site