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    SubjectRe: [patch 3/4] cpu alloc: The allocator
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    On Mon, 2008-09-29 at 12:35 -0700, Christoph Lameter wrote:
    > Index: linux-2.6/mm/cpu_alloc.c
    > ===================================================================
    > --- /dev/null 1970-01-01 00:00:00.000000000 +0000
    > +++ linux-2.6/mm/cpu_alloc.c 2008-09-29 13:09:33.000000000 -0500
    > @@ -0,0 +1,185 @@
    > +/*
    > + * Cpu allocator - Manage objects allocated for each processor
    > + *
    > + * (C) 2008 SGI, Christoph Lameter <cl@linux-foundation.org>
    > + * Basic implementation with allocation and free from a dedicated per
    > + * cpu area.
    > + *
    > + * The per cpu allocator allows a dynamic allocation of a piece of memory on
    > + * every processor. A bitmap is used to track used areas.
    > + * The allocator implements tight packing to reduce the cache footprint
    > + * and increase speed since cacheline contention is typically not a concern
    > + * for memory mainly used by a single cpu. Small objects will fill up gaps
    > + * left by larger allocations that required alignments.
    > + */
    > +#include <linux/mm.h>
    > +#include <linux/mmzone.h>
    > +#include <linux/module.h>
    > +#include <linux/percpu.h>
    > +#include <linux/bitmap.h>
    > +#include <asm/sections.h>
    > +#include <linux/bootmem.h>
    > +
    > +/*
    > + * Basic allocation unit. A bit map is created to track the use of each
    > + * UNIT_SIZE element in the cpu area.
    > + */
    > +#define UNIT_TYPE int
    > +#define UNIT_SIZE sizeof(UNIT_TYPE)
    > +
    > +int units; /* Actual available units */

    What is this thing? Otherwise looks good to me.



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