Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754334Ab3HBCIE (ORCPT ); Thu, 1 Aug 2013 22:08:04 -0400 Received: from LGEMRELSE1Q.lge.com ([156.147.1.111]:62998 "EHLO LGEMRELSE1Q.lge.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752621Ab3HBCIC (ORCPT ); Thu, 1 Aug 2013 22:08:02 -0400 X-AuditID: 9c93016f-b7b05ae000002bbd-4d-51fb1481f775 From: Joonsoo Kim To: Andrew Morton Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org, Joonsoo Kim , Minchan Kim , Johannes Weiner , Mel Gorman , Rik van Riel , Joonsoo Kim Subject: [PATCH 1/4] mm, page_alloc: add likely macro to help compiler optimization Date: Fri, 2 Aug 2013 11:07:56 +0900 Message-Id: <1375409279-16919-1-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: 849 Lines: 27 We rarely allocate a page with ALLOC_NO_WATERMARKS and it is used in slow path. For making fast path more faster, add likely macro to help compiler optimization. Signed-off-by: Joonsoo Kim diff --git a/mm/page_alloc.c b/mm/page_alloc.c index b100255..86ad44b 100644 --- a/mm/page_alloc.c +++ b/mm/page_alloc.c @@ -1901,7 +1901,7 @@ zonelist_scan: goto this_zone_full; BUILD_BUG_ON(ALLOC_NO_WATERMARKS < NR_WMARK); - if (!(alloc_flags & ALLOC_NO_WATERMARKS)) { + if (likely(!(alloc_flags & ALLOC_NO_WATERMARKS))) { unsigned long mark; int ret; -- 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/