linux-kernel - Re: [PATCH] slab: deal with NULL pointers passed to kmem_cache

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Date:	Tue, 20 Mar 2007 08:56:56 +0100
From:	Eric Dumazet <dada1@...mosbay.com>
To:	Pekka J Enberg <penberg@...helsinki.fi>
CC:	Andrew Morton <akpm@...ux-foundation.org>, mpm@...enic.com,
	Christoph Lameter <clameter@....com>,
	"ast@...dv.de" <ast@...dv.de>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] slab: deal with NULL pointers passed to kmem_cache_free

Pekka J Enberg a écrit :
> Thanks for the profile. I still wonder where exactly thouse super-hot 
> call-sites are...
> 

In this case, it's a typical network server

Each time a packet is sent to or received from network, network stack has to 
allocate/free a skb (kmem_cache_alloc()/kmem_cache_free() and its data 
(kmalloc/kfree)

Other paths are for example dentries allocations, file allocations, ... really 
  many spots for some workloads.

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