linux-kernel - Re: [patch 1/2] slub: move min_partial to struct kmem

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Date:	Mon, 23 Feb 2009 11:09:22 -0500 (EST)
From:	Christoph Lameter <cl@...ux-foundation.org>
To:	David Rientjes <rientjes@...gle.com>
cc:	Pekka Enberg <penberg@...helsinki.fi>, linux-kernel@...r.kernel.org
Subject: Re: [patch 1/2] slub: move min_partial to struct kmem_cache

On Sun, 22 Feb 2009, David Rientjes wrote:

> +static void calculate_min_partial(struct kmem_cache *s, unsigned long min)
> +{
> +	if (min < MIN_PARTIAL)
> +		min = MIN_PARTIAL;
> +	else if (min > MAX_PARTIAL)
> +		min = MAX_PARTIAL;
> +	s->min_partial = min;
> +}
> +
>  /*
>   * calculate_sizes() determines the order and the distribution of data within
>   * a slab object.
> @@ -2319,6 +2317,11 @@ static int kmem_cache_open(struct kmem_cache *s, gfp_t gfpflags,
>  	if (!calculate_sizes(s, -1))
>  		goto error;
>
> +	/*
> +	 * The larger the object size is, the more pages we want on the partial
> +	 * list to avoid pounding the page allocator excessively.
> +	 */
> +	calculate_min_partial(s, ilog2(s->size));
>  	s->refcount = 1;
>  #ifdef CONFIG_NUMA
>  	s->remote_node_defrag_ratio = 1000;
>

Move the ilog2 use into calculate_min_partial()? Otherweise
calculate_min_partial is merely enforcing limits and not doing any
calculations.

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