From: Lai Jiangshan <laijs@cn.fujitsu.com>
To: Andrew Morton <akpm@linux-foundation.org>
Cc: Pekka Enberg <penberg@cs.helsinki.fi>,
Christoph Lameter <cl@linux-foundation.org>,
Nick Piggin <npiggin@suse.de>,
"Paul E. McKenney" <paulmck@linux.vnet.ibm.com>,
Manfred Spraul <manfred@colorfullife.com>,
Ingo Molnar <mingo@elte.hu>,
Peter Zijlstra <peterz@infradead.org>,
linux-kernel@vger.kernel.org
Subject: [PATCH -mm 1/6] slab: introduce __kfree_rcu
Date: Tue, 03 Mar 2009 21:44:19 +0800 [thread overview]
Message-ID: <49AD3433.9000001@cn.fujitsu.com> (raw)
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 <laijs@cn.fujitsu.com>
---
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);
next reply other threads:[~2009-03-03 13:46 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-03-03 13:44 Lai Jiangshan [this message]
2009-03-23 7:48 ` [PATCH -mm 1/6] slab: introduce __kfree_rcu Pekka Enberg
2009-03-23 13:33 ` Christoph Lameter
2009-03-23 15:59 ` Ingo Molnar
2009-03-23 16:40 ` Christoph Lameter
2009-03-23 16:56 ` Ingo Molnar
2009-03-23 17:49 ` Pekka Enberg
2009-03-23 18:06 ` Christoph Lameter
2009-03-23 18:59 ` Pekka Enberg
2009-03-23 19:06 ` Christoph Lameter
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=49AD3433.9000001@cn.fujitsu.com \
--to=laijs@cn.fujitsu.com \
--cc=akpm@linux-foundation.org \
--cc=cl@linux-foundation.org \
--cc=linux-kernel@vger.kernel.org \
--cc=manfred@colorfullife.com \
--cc=mingo@elte.hu \
--cc=npiggin@suse.de \
--cc=paulmck@linux.vnet.ibm.com \
--cc=penberg@cs.helsinki.fi \
--cc=peterz@infradead.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).