linux-kernel - [PATCH] file lock: reorder struct file_lock to save space on 64 bit builds

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Message-Id: <1214299104.3815.5.camel@castor.localdomain>
Date:	Tue, 24 Jun 2008 10:18:24 +0100
From:	Richard Kennedy <richard@....demon.co.uk>
To:	matthew@....cx
Cc:	lkml <linux-kernel@...r.kernel.org>
Subject: [PATCH] file lock: reorder struct file_lock to save space on 64
	bit builds

reduce sizeof struct file_lock by 8 on 64 bit builds allowing +1 objects
per slab in the file_lock_cache
    
Signed-off-by: Richard Kennedy <richard@....demon.co.uk>

---

patch against 2.6.26-rc7
successfully running on AMD64 desktop.

Richard
 


diff --git a/include/linux/fs.h b/include/linux/fs.h
index d490779..a0735d7 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -919,12 +919,12 @@ struct file_lock {
 	struct list_head fl_link;	/* doubly linked list of all locks */
 	struct list_head fl_block;	/* circular list of blocked processes */
 	fl_owner_t fl_owner;
+	unsigned char fl_flags;
+	unsigned char fl_type;
 	unsigned int fl_pid;
 	struct pid *fl_nspid;
 	wait_queue_head_t fl_wait;
 	struct file *fl_file;
-	unsigned char fl_flags;
-	unsigned char fl_type;
 	loff_t fl_start;
 	loff_t fl_end;
 


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