linux-kernel - Re: [patch 3/4] cpu alloc: The allocator

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Message-Id: <1222756559.10002.23.camel@penberg-laptop>
Date:	Tue, 30 Sep 2008 09:35:59 +0300
From:	Pekka Enberg <penberg@...helsinki.fi>
To:	Christoph Lameter <cl@...ux-foundation.org>
Cc:	akpm@...ux-foundation.org, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org, rusty@...tcorp.com.au, jeremy@...p.org,
	ebiederm@...ssion.com, travis@....com, herbert@...dor.apana.org.au,
	xemul@...nvz.org
Subject: Re: [patch 3/4] cpu alloc: The allocator

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@...ux-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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