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From: Wei Yang <richard.weiyang@gmail.com>
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 <richard.weiyang@gmail.com>
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	[thread overview]
Message-ID: <20170430113152.6590-2-richard.weiyang@gmail.com> (raw)
In-Reply-To: <20170430113152.6590-1-richard.weiyang@gmail.com>

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 <richard.weiyang@gmail.com>
---
 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

  reply	other threads:[~2017-04-30 11:32 UTC|newest]

Thread overview: 11+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-04-30 11:31 [PATCH 0/3] try to save some memory for kmem_cache in some cases Wei Yang
2017-04-30 11:31 ` Wei Yang [this message]
2017-04-30 11:31 ` [PATCH 2/3] mm/slub: wrap cpu_slab->partial in CONFIG_SLUB_CPU_PARTIAL Wei Yang
2017-05-01  2:41   ` Matthew Wilcox
2017-05-01  7:39     ` Wei Yang
2017-05-01  8:20     ` Wei Yang
2017-05-01 14:39       ` Matthew Wilcox
2017-05-01 15:15         ` Wei Yang
2017-04-30 11:31 ` [PATCH 3/3] mm/slub: wrap kmem_cache->cpu_partial in config CONFIG_SLUB_CPU_PARTIAL Wei Yang
2017-05-01 15:37   ` Wei Yang
2017-04-30 21:22 ` [PATCH 0/3] try to save some memory for kmem_cache in some cases Christoph Lameter

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