linux-kernel - Re: [patch 1/7] allocpercpu: Make it a true per cpu allocator by allocating from a per cpu array

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Message-ID: <47297F42.4050603@cosmosbay.com>
Date:	Thu, 01 Nov 2007 08:24:50 +0100
From:	Eric Dumazet <dada1@...mosbay.com>
To:	Christoph Lameter <clameter@....com>
CC:	akpm@...ux-foundation.org, linux-arch@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>,
	Pekka Enberg <penberg@...helsinki.fi>
Subject: Re: [patch 1/7] allocpercpu: Make it a true per cpu allocator by
 allocating from a per cpu array

Christoph Lameter a écrit :
> +
> +enum unit_type { FREE, END, USED };
> +
> +static u8 cpu_alloc_map[UNITS_PER_CPU] = { 1, };

You mean END here instead of 1 :)


> +/*
> + * Allocate an object of a certain size
> + *
> + * Returns a per cpu pointer that must not be directly used.
> + */
> +static void *cpu_alloc(unsigned long size)
> +{

We might need to give an alignment constraint here. Some per_cpu users would 
like to get a 64 bytes zone, siting in one cache line and not two :)


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