linux-kernel - Re: SLUB: Avoid atomic operation for slab

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Message-ID: <Pine.LNX.4.64.0710190420180.29352@schroedinger.engr.sgi.com>
Date:	Fri, 19 Oct 2007 04:20:44 -0700 (PDT)
From:	Christoph Lameter <clameter@....com>
To:	Nick Piggin <nickpiggin@...oo.com.au>
cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	akpm@...ux-foundation.org, linux-mm@...ck.org
Subject: Re: SLUB: Avoid atomic operation for slab_unlock

Acked-by: Christoph Lameter <clameter@....com>


Slub can use the non-atomic version to unlock because other flags will not
get modified with the lock held.

Signed-off-by: Nick Piggin <npiggin@...e.de>

---
 mm/slub.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

Index: linux-2.6/mm/slub.c
===================================================================
--- linux-2.6.orig/mm/slub.c
+++ linux-2.6/mm/slub.c
@@ -1185,7 +1185,7 @@ static __always_inline void slab_lock(st
 
 static __always_inline void slab_unlock(struct page *page)
 {
-	bit_spin_unlock(PG_locked, &page->flags);
+	__bit_spin_unlock(PG_locked, &page->flags);
 }
 
 static __always_inline int slab_trylock(struct page *page)

-
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