linux-kernel - [PATCH] slub: look up object from the freelist once

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Message-ID: <Pine.LNX.4.64.0802291105230.5423@sbz-30.cs.Helsinki.FI>
Date:	Fri, 29 Feb 2008 11:07:30 +0200 (EET)
From:	Pekka J Enberg <penberg@...helsinki.fi>
To:	clameter@....com
cc:	linux-kernel@...r.kernel.org
Subject: [PATCH] slub: look up object from the freelist once

From: Pekka Enberg <penberg@...helsinki.fi>

We only need to look up object from c->page->freelist once in 
__slab_alloc().

Signed-off-by: Pekka Enberg <penberg@...helsinki.fi>
---
 mm/slub.c |    2 --
 1 file changed, 2 deletions(-)

Index: linux-2.6/mm/slub.c
===================================================================
--- linux-2.6.orig/mm/slub.c
+++ linux-2.6/mm/slub.c
@@ -1522,7 +1522,6 @@ load_freelist:
 	if (unlikely(SlabDebug(c->page)))
 		goto debug;
 
-	object = c->page->freelist;
 	c->freelist = object[c->offset];
 	c->page->inuse = s->objects;
 	c->page->freelist = c->page->end;
@@ -1578,7 +1577,6 @@ new_slab:
 
 	return NULL;
 debug:
-	object = c->page->freelist;
 	if (!alloc_debug_processing(s, c->page, object, addr))
 		goto another_slab;
 
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