lkml.org 
[lkml]   [2008]   [Mar]   [24]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    /
    Date
    From
    Subject[PATCH 00/10] NR_CPUS: third reduction of NR_CPUS memory usage

    Here's the third 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, or allocate the array based on nr_cpu_ids.

    In addition, there's a cleanup of x86 non-smp code, the movement of
    setting nr_cpu_ids to setup_per_cpu_areas() so it's available as soon
    as possible, and a new function cpumask_scnprintf_len() to return the
    number of characters needed to display "len" cpumask bits.

    Affected files:

    arch/ia64/kernel/acpi.c
    arch/ia64/kernel/setup.c
    arch/powerpc/kernel/setup_64.c
    arch/sparc64/mm/init.c
    arch/x86/kernel/cpu/intel_cacheinfo.c
    arch/x86/kernel/genapic_64.c
    arch/x86/kernel/mpparse_64.c
    arch/x86/kernel/setup64.c
    arch/x86/kernel/smpboot_32.c
    arch/x86/mm/numa_64.c
    arch/x86/oprofile/nmi_int.c
    drivers/acpi/processor_core.c
    drivers/acpi/processor_idle.c
    drivers/acpi/processor_perflib.c
    drivers/acpi/processor_throttling.c
    drivers/base/cpu.c
    drivers/cpufreq/cpufreq.c
    drivers/cpufreq/cpufreq_stats.c
    drivers/cpufreq/freq_table.c
    include/acpi/processor.h
    include/asm-x86/smp_32.h
    include/asm-x86/smp_64.h
    include/asm-x86/topology.h
    include/linux/bitmap.h
    include/linux/cpumask.h
    init/main.c
    kernel/sched.c
    lib/bitmap.c
    net/core/dev.c

    Based on linux-2.6.25-rc5-mm1

    Cc: Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
    Cc: Andi Kleen <ak@suse.de>
    Cc: Anton Blanchard <anton@samba.org>
    Cc: Christoph Lameter <clameter@sgi.com>
    Cc: Dave Jones <davej@codemonkey.org.uk>
    Cc: David S. Miller <davem@davemloft.net>
    Cc: H. Peter Anvin <hpa@zytor.com>
    Cc: Ingo Molnar <mingo@elte.hu>
    Cc: Ingo Molnar <mingo@redhat.com>
    Cc: James Morris <jmorris@namei.org>
    Cc: Len Brown <len.brown@intel.com>
    Cc: Patrick McHardy <kaber@trash.net>
    Cc: Paul Jackson <pj@sgi.com>
    Cc: Paul Mackerras <paulus@samba.org>
    Cc: Philippe Elie <phil.el@wanadoo.fr>
    Cc: Thomas Gleixner <tglx@linutronix.de>
    Cc: Tony Luck <tony.luck@intel.com>
    Cc: William L. Irwin <wli@holomorphy.com>

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

    I moved the x86_64 cleanup and move-set-nr_cpu_ids from the zero-based
    percpu variables patchset to this one, as I was encountering a panic
    from system_call_after_swapgs() after an unknown device interrupt during
    module loading. That problem will be dealt with in another patch.


    Here's the various effects of the patches on memory usages using the
    akpm2 config file with NR_CPUS=4096 and MAXNODES=512:

    ====== Data (-l 500)
    1 - initial
    2 - cleanup
    4 - nr_cpus-in-cpufreq-cpu_alloc
    5 - nr_cpus-in-acpi-driver-cpu_alloc
    7 - nr_cpus-in-intel_cacheinfo
    8 - nr_cpus-in-cpu_c
    11 - nr_cpus-in-kernel_sched

    .1. .2. .4. .5. .7. .8. .11.
    32768 . -32768 . . . . show_table(.bss)
    32768 . . . . . -32768 sched_group_nodes_bycpu(.bss)
    32768 . . -32768 . . . processors(.bss)
    32768 . . -32768 . . . processor_device_array(.bss)
    32768 . . . . . -32768 init_sched_entity_p(.bss)
    32768 . . . . . -32768 init_cfs_rq_p(.bss)
    32768 . . .-32768 . . index_kobject(.bss)
    32768 . . .-32768 . . cpuid4_info(.bss)
    32768 . -32768 . . . . cpufreq_cpu_governor(.bss)
    32768 . -32768 . . . . cpufreq_cpu_data(.bss)
    32768 . . . . -32768 . cpu_sys_devices(.bss)
    32768 . . .-32768 . . cache_kobject(.bss)

    ====== Text/Data ()
    1 - initial
    4 - nr_cpus-in-cpufreq-cpu_alloc
    5 - nr_cpus-in-acpi-driver-cpu_alloc
    7 - nr_cpus-in-intel_cacheinfo
    8 - nr_cpus-in-cpu_c
    11 - nr_cpus-in-kernel_sched

    .1. .4. .5. .7. .8. .11. ..final..
    3373056 . +2048 . . . 3375104 <1% TextSize
    1656832 . +2048 . . . 1658880 <1% DataSize
    1855488 -98304 -65536 -98304 -32768 -98304 1462272 -21% BssSize
    10395648 . +4096 . . . 10399744 <1% OtherSize
    17281024 -98304 -57344 -98304 -32768 -98304 16896000 -2% Totals

    ====== Stack (-l 500)
    ... files 11 vars 928 all 0 lim 500 unch 0

    1 - initial
    7 - nr_cpus-in-intel_cacheinfo
    11 - nr_cpus-in-kernel_sched

    .1. .7. .11. ..final..
    4648 . -4080 568 -87% cpu_attach_domain
    4104 -4104 . . -100% show_shared_cpu_map
    8752 -4104 -4080 568 -93% Totals

    --


    \
     
     \ /
      Last update: 2008-03-25 03:23    [W:0.025 / U:91.036 seconds]
    ©2003-2016 Jasper Spaans. hosted at Digital OceanAdvertise on this site