linux-kernel - [PATCH] cfq: remove 8 bytes of padding from cfq_rb

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Date:	Mon, 01 Mar 2010 09:46:05 +0000
From:	Richard Kennedy <richard@....demon.co.uk>
To:	Jens Axboe <jens.axboe@...cle.com>
Cc:	lkml <linux-kernel@...r.kernel.org>
Subject: [PATCH] cfq: remove 8 bytes of padding from cfq_rb_root on 64 bit
 builds

Reorder cfq_rb_root to remove 8 bytes of padding on 64 bit builds.
    

Consequently removing 56 bytes from cfq_group and 64 bytes from
cfq_data.
    
    
Signed-off-by: Richard Kennedy <richard@....demon.co.uk>

---
patch against 2.6.33
compiled & tested on x86_64 AMD-X2

regards
Richard

diff --git a/block/cfq-iosched.c b/block/cfq-iosched.c
index e3dedfd..daff53d 100644
--- a/block/cfq-iosched.c
+++ b/block/cfq-iosched.c
@@ -77,11 +77,12 @@ struct cfq_rb_root {
 	struct rb_root rb;
 	struct rb_node *left;
 	unsigned count;
+	unsigned total_weight;
 	u64 min_vdisktime;
 	struct rb_node *active;
-	unsigned total_weight;
 };
-#define CFQ_RB_ROOT	(struct cfq_rb_root) { RB_ROOT, NULL, 0, 0, }
+#define CFQ_RB_ROOT	(struct cfq_rb_root) { .rb = RB_ROOT, .left = NULL, \
+			.count = 0, .min_vdisktime = 0, }
 
 /*
  * Per process-grouping structure


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