From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-pg0-f70.google.com (mail-pg0-f70.google.com [74.125.83.70]) by kanga.kvack.org (Postfix) with ESMTP id C4E5D6B02EE for ; Sun, 30 Apr 2017 07:32:05 -0400 (EDT) Received: by mail-pg0-f70.google.com with SMTP id w23so5060642pgm.22 for ; Sun, 30 Apr 2017 04:32:05 -0700 (PDT) Received: from mail-pf0-x244.google.com (mail-pf0-x244.google.com. [2607:f8b0:400e:c00::244]) by mx.google.com with ESMTPS id b12si12407808plm.77.2017.04.30.04.32.04 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Sun, 30 Apr 2017 04:32:05 -0700 (PDT) Received: by mail-pf0-x244.google.com with SMTP id b23so8281856pfc.0 for ; Sun, 30 Apr 2017 04:32:04 -0700 (PDT) From: Wei Yang Subject: [PATCH 1/3] mm/slub: pack red_left_pad with another int to save a word Date: Sun, 30 Apr 2017 19:31:50 +0800 Message-Id: <20170430113152.6590-2-richard.weiyang@gmail.com> In-Reply-To: <20170430113152.6590-1-richard.weiyang@gmail.com> References: <20170430113152.6590-1-richard.weiyang@gmail.com> Sender: owner-linux-mm@kvack.org List-ID: To: cl@linux.com, penberg@kernel.org, rientjes@google.com, iamjoonsoo.kim@lge.com, akpm@linux-foundation.org Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org, Wei Yang On 64bit arch, struct is 8-bytes aligned, so int will occupy a word if it doesn't sits well. This patch pack red_left_pad with reserved to save 8 bytes for struct kmem_cache on a 64bit arch. Signed-off-by: Wei Yang --- include/linux/slub_def.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/include/linux/slub_def.h b/include/linux/slub_def.h index 07ef550c6627..ec13aab32647 100644 --- a/include/linux/slub_def.h +++ b/include/linux/slub_def.h @@ -79,9 +79,9 @@ struct kmem_cache { int inuse; /* Offset to metadata */ int align; /* Alignment */ int reserved; /* Reserved bytes at the end of slabs */ + int red_left_pad; /* Left redzone padding size */ const char *name; /* Name (only for display!) */ struct list_head list; /* List of slab caches */ - int red_left_pad; /* Left redzone padding size */ #ifdef CONFIG_SYSFS struct kobject kobj; /* For sysfs */ #endif -- 2.11.0 -- 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