linux-kernel - Re: [patch 1/3] slub: add per-cache slab thrash ratio

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Date:	Mon, 30 Mar 2009 10:30:41 -0400 (EDT)
From:	Christoph Lameter <cl@...ux.com>
To:	David Rientjes <rientjes@...gle.com>
cc:	Pekka Enberg <penberg@...helsinki.fi>,
	Nick Piggin <nickpiggin@...oo.com.au>,
	Martin Bligh <mbligh@...gle.com>, linux-kernel@...r.kernel.org
Subject: Re: [patch 1/3] slub: add per-cache slab thrash ratio

On Sun, 29 Mar 2009, David Rientjes wrote:

> @@ -2291,10 +2292,13 @@ static int calculate_sizes(struct kmem_cache *s, int forced_order)
>  	/*
>  	 * Determine the number of objects per slab
>  	 */
> +	if (oo_objects(s->oo))
> +		thrash_ratio = s->min_free_watermark * 100 / oo_objects(s->oo);
>  	s->oo = oo_make(order, size);

s->oo is set *after* you check it. Check oo_objects after the value has
been set please.


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