From: Christoph Lameter <cl@linux.com>
To: Pekka Enberg <penberg@cs.helsinki.fi>
Cc: David Rientjes <rientjes@google.com>
Cc: Hugh Dickins <hughd@google.com>
Cc: Eric Dumazet <eric.dumazet@gmail.com>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Cc: linux-kernel@vger.kernel.org
Cc: Thomas Gleixner <tglx@linutronix.de>
Subject: [slubllv4 15/16] slub: Not necessary to check for empty slab on load_freelist
Date: Fri, 06 May 2011 13:05:56 -0500 [thread overview]
Message-ID: <20110506180702.930651504@linux.com> (raw)
In-Reply-To: 20110506180541.990069206@linux.com
[-- Attachment #1: goto_load_freelist --]
[-- Type: text/plain, Size: 746 bytes --]
Load freelist is now only branched to if there are objects available.
So no need to check.
---
mm/slub.c | 5 ++---
1 file changed, 2 insertions(+), 3 deletions(-)
Index: linux-2.6/mm/slub.c
===================================================================
--- linux-2.6.orig/mm/slub.c 2011-05-06 09:06:34.000000000 -0500
+++ linux-2.6/mm/slub.c 2011-05-06 09:06:37.000000000 -0500
@@ -1966,14 +1966,13 @@ static void *__slab_alloc(struct kmem_ca
"__slab_alloc"));
}
-load_freelist:
- VM_BUG_ON(!page->frozen);
-
if (unlikely(!object)) {
c->page = NULL;
goto new_slab;
}
+load_freelist:
+ VM_BUG_ON(!page->frozen);
c->freelist = get_freepointer(s, object);
c->tid = next_tid(c->tid);
local_irq_restore(flags);
next prev parent reply other threads:[~2011-05-06 18:07 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-05-06 18:05 [slubllv4 00/16] SLUB: Lockless freelists for objects V4 Christoph Lameter
2011-05-06 18:05 ` [slubllv4 01/16] slub: Per object NUMA support Christoph Lameter
2011-05-06 18:05 ` [slubllv4 02/16] slub: Do not use frozen page flag but a bit in the page counters Christoph Lameter
2011-05-06 18:05 ` [slubllv4 03/16] slub: Move page->frozen handling near where the page->freelist handling occurs Christoph Lameter
2011-05-06 18:05 ` [slubllv4 04/16] x86: Add support for cmpxchg_double Christoph Lameter
2011-05-06 18:05 ` [slubllv4 05/16] mm: Rearrange struct page Christoph Lameter
2011-05-06 18:05 ` [slubllv4 06/16] slub: Add cmpxchg_double_slab() Christoph Lameter
2011-05-06 18:05 ` [slubllv4 07/16] slub: explicit list_lock taking Christoph Lameter
2011-05-06 18:05 ` [slubllv4 08/16] slub: Pass kmem_cache struct to lock and freeze slab Christoph Lameter
2011-05-06 18:05 ` [slubllv4 09/16] slub: Rework allocator fastpaths Christoph Lameter
2011-05-06 18:05 ` [slubllv4 10/16] slub: Invert locking and avoid slab lock Christoph Lameter
2011-05-06 18:05 ` [slubllv4 11/16] slub: Disable interrupts in free_debug processing Christoph Lameter
2011-05-06 18:05 ` [slubllv4 12/16] slub: Avoid disabling interrupts in free slowpath Christoph Lameter
2011-05-06 18:05 ` [slubllv4 13/16] slub: Get rid of the another_slab label Christoph Lameter
2011-05-06 18:05 ` [slubllv4 14/16] slub: fast release on full slab Christoph Lameter
2011-05-06 18:05 ` Christoph Lameter [this message]
2011-05-06 18:05 ` [slubllv4 16/16] slub: update statistics for cmpxchg handling Christoph Lameter
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