Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755388AbZCCNq0 (ORCPT ); Tue, 3 Mar 2009 08:46:26 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1753579AbZCCNp5 (ORCPT ); Tue, 3 Mar 2009 08:45:57 -0500 Received: from cn.fujitsu.com ([222.73.24.84]:65164 "EHLO song.cn.fujitsu.com" rhost-flags-OK-FAIL-OK-OK) by vger.kernel.org with ESMTP id S1753500AbZCCNp4 (ORCPT ); Tue, 3 Mar 2009 08:45:56 -0500 Message-ID: <49AD3433.9000001@cn.fujitsu.com> Date: Tue, 03 Mar 2009 21:44:19 +0800 From: Lai Jiangshan User-Agent: Thunderbird 2.0.0.6 (Windows/20070728) MIME-Version: 1.0 To: Andrew Morton CC: Pekka Enberg , Christoph Lameter , Nick Piggin , "Paul E. McKenney" , Manfred Spraul , Ingo Molnar , Peter Zijlstra , linux-kernel@vger.kernel.org Subject: [PATCH -mm 1/6] slab: introduce __kfree_rcu Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1628 Lines: 63 Introduce __kfree_rcu() for kfree_rcu() We can calculate the object poiter from a poiter inside this object in slab.c, so we can use a portion_to_obj() to instead various container_of() for rcu callback and free the object. Signed-off-by: Lai Jiangshan --- diff --git a/mm/slab.c b/mm/slab.c index 4d00855..a067d3f 100644 --- a/mm/slab.c +++ b/mm/slab.c @@ -634,6 +634,17 @@ static inline unsigned int obj_to_index(const struct kmem_cache *cache, return reciprocal_divide(offset, cache->reciprocal_buffer_size); } +static inline void *portion_to_obj(void *portion) +{ + struct page *page = virt_to_head_page(portion); + struct slab *slab = page_get_slab(page); + struct kmem_cache *cache = page_get_cache(page); + unsigned int offset = portion - slab->s_mem; + unsigned int index = offset / cache->buffer_size; + + return index_to_obj(cache, slab, index); +} + /* * These are the default caches for kmalloc. Custom caches can have other sizes. */ @@ -3728,6 +3739,17 @@ void kfree(const void *objp) } EXPORT_SYMBOL(kfree); +static void kfree_rcu_callback(struct rcu_head *rcu) +{ + kfree(portion_to_obj(rcu)); +} + +void __kfree_rcu(const void *objp, struct rcu_head *rcu) +{ + call_rcu(rcu, kfree_rcu_callback); +} +EXPORT_SYMBOL(__kfree_rcu); + unsigned int kmem_cache_size(struct kmem_cache *cachep) { return obj_size(cachep); -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/