netdev - Re: [MM PATCH V4.1 5/6] slub: support for bulk free with SLUB freelists

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Message-ID: <alpine.DEB.2.20.1510020508580.2991@east.gentwo.org>
Date:	Fri, 2 Oct 2015 05:10:02 -0500 (CDT)
From:	Christoph Lameter <cl@...ux.com>
To:	Jesper Dangaard Brouer <brouer@...hat.com>
cc:	Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org,
	Alexander Duyck <alexander.duyck@...il.com>,
	Pekka Enberg <penberg@...nel.org>, netdev@...r.kernel.org,
	Joonsoo Kim <iamjoonsoo.kim@....com>,
	David Rientjes <rientjes@...gle.com>
Subject: Re: [MM PATCH V4.1 5/6] slub: support for bulk free with SLUB
 freelists

On Fri, 2 Oct 2015, Jesper Dangaard Brouer wrote:

> Thus, I need introducing new code like this patch and at the same time
> have to reduce the number of instruction-cache misses/usage.  In this
> case we solve the problem by kmem_cache_free_bulk() not getting called
> too often. Thus, +17 bytes will hopefully not matter too much... but on
> the other hand we sort-of know that calling kmem_cache_free_bulk() will
> cause icache misses.

Can we just drop the WARN/BUG here? Nothing untoward happens if size == 0
right?

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