linux-ext4 - Re: [PATCH 3/3] ext4: Use readahead when reading an inode from the inode table

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Date:	Fri, 26 Sep 2008 02:21:07 -0600
From:	Andreas Dilger <adilger@....com>
To:	"Theodore Ts'o" <tytso@....edu>
Cc:	Ext4 Developers List <linux-ext4@...r.kernel.org>
Subject: Re: [PATCH 3/3] ext4: Use readahead when reading an inode from the
	inode table

On Sep 24, 2008  12:53 -0400, Theodore Ts'o wrote:
> @@ -514,8 +514,10 @@ static void ext4_put_super(struct super_block *sb)
> +	if (sbi->s_proc) {
> +		remove_proc_entry("inode_readahead_bits", sbi->s_proc);
>  		remove_proc_entry(sb->s_id, ext4_proc_root);

As a general UI interface, specifying the "bits to shift the filesystem
block number" seems like an easy-to-implement but is fairly bad from
a usability point of view.  I'd much prefer to specify this as a
number of kB to readahead, and it can be converted internally to the
number of blocks to readahead.  It isn't fatal if we do a bit of rounding
on the input value to match a full blocksize.

Cheers, Andreas
--
Andreas Dilger
Sr. Staff Engineer, Lustre Group
Sun Microsystems of Canada, Inc.

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