linux-kernel - Re: [PATCH] fs: inode - remove 8 bytes of padding on 64bits allowing 1 more objects/slab under slub

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Message-ID: <20100215112950.GB4194@quack.suse.cz>
Date:	Mon, 15 Feb 2010 12:29:50 +0100
From:	Jan Kara <jack@...e.cz>
To:	Richard Kennedy <richard@....demon.co.uk>
Cc:	Matthew Wilcox <matthew@....cx>, Al Viro <viro@...iv.linux.org.uk>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Jan Kara <jack@...e.cz>, Christoph Hellwig <hch@....de>,
	lkml <linux-kernel@...r.kernel.org>,
	linux-fsdevel <linux-fsdevel@...r.kernel.org>,
	Jens Axboe <jens.axboe@...cle.com>
Subject: Re: [PATCH] fs: inode - remove 8 bytes of padding on 64bits
 allowing 1 more objects/slab under slub

On Mon 15-02-10 11:16:11, Richard Kennedy wrote:
> This removes 8 bytes of padding from struct inode on 64bit builds, and
> so allows 1 more object/slab in the inode_cache when using slub.
> 
> Signed-off-by: Richard Kennedy <richard@....demon.co.uk>
  Looks good to me.
Acked-by: Jan Kara <jack@...e.cz>

								Honza
> ----
> patch against 2.6.33-rc8
> compiled & tested on x86_64 AMDX2 
> 
> I've been running this patch for over a week with no obvious problems
> regards
> Richard
> 
> 
> diff --git a/include/linux/fs.h b/include/linux/fs.h
> index b1bcb27..ebb1cd5 100644
> --- a/include/linux/fs.h
> +++ b/include/linux/fs.h
> @@ -729,6 +729,7 @@ struct inode {
>  	uid_t			i_uid;
>  	gid_t			i_gid;
>  	dev_t			i_rdev;
> +	unsigned int		i_blkbits;
>  	u64			i_version;
>  	loff_t			i_size;
>  #ifdef __NEED_I_SIZE_ORDERED
> @@ -738,7 +739,6 @@ struct inode {
>  	struct timespec		i_mtime;
>  	struct timespec		i_ctime;
>  	blkcnt_t		i_blocks;
> -	unsigned int		i_blkbits;
>  	unsigned short          i_bytes;
>  	umode_t			i_mode;
>  	spinlock_t		i_lock;	/* i_blocks, i_bytes, maybe i_size */
> 
> 
-- 
Jan Kara <jack@...e.cz>
SUSE Labs, CR
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