From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from psmtp.com (na3sys010amx147.postini.com [74.125.245.147]) by kanga.kvack.org (Postfix) with SMTP id 607DE6B0031 for ; Thu, 1 Aug 2013 22:08:02 -0400 (EDT) From: 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> Sender: owner-linux-mm@kvack.org List-ID: 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 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, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org