Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754236Ab3HBCCr (ORCPT ); Thu, 1 Aug 2013 22:02:47 -0400 Received: from LGEMRELSE1Q.lge.com ([156.147.1.111]:50761 "EHLO LGEMRELSE1Q.lge.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751622Ab3HBCCq (ORCPT ); Thu, 1 Aug 2013 22:02:46 -0400 X-AuditID: 9c93016f-b7b05ae000002bbd-ea-51fb1344d287 From: Joonsoo Kim To: Pekka Enberg Cc: Christoph Lameter , linux-mm@kvack.org, linux-kernel@vger.kernel.org, Joonsoo Kim , Joonsoo Kim Subject: [PATCH] mm, slab_common: add 'unlikely' to size check of kmalloc_slab() Date: Fri, 2 Aug 2013 11:02:42 +0900 Message-Id: <1375408962-16743-1-git-send-email-iamjoonsoo.kim@lge.com> X-Mailer: git-send-email 1.7.9.5 X-Brightmail-Tracker: AAAAAA== Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 777 Lines: 26 Size is usually below than KMALLOC_MAX_SIZE. If we add a 'unlikely' macro, compiler can make better code. Signed-off-by: Joonsoo Kim diff --git a/mm/slab_common.c b/mm/slab_common.c index 538bade..f0410eb 100644 --- a/mm/slab_common.c +++ b/mm/slab_common.c @@ -373,7 +373,7 @@ struct kmem_cache *kmalloc_slab(size_t size, gfp_t flags) { int index; - if (size > KMALLOC_MAX_SIZE) { + if (unlikely(size > KMALLOC_MAX_SIZE)) { WARN_ON_ONCE(!(flags & __GFP_NOWARN)); return NULL; } -- 1.7.9.5 -- 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/