linux-ext4 - Re: [PATCH] ext2 statfs speed up

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Message-ID: <20070705210651.GN5633@schatzie.adilger.int>
Date:	Thu, 5 Jul 2007 15:06:51 -0600
From:	Andreas Dilger <adilger@...sterfs.com>
To:	Badari Pulavarty <pbadari@...ibm.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	ext4 <linux-ext4@...r.kernel.org>
Subject: Re: [PATCH] ext2 statfs speed up

On Jul 05, 2007  11:11 -0700, Badari Pulavarty wrote:
> @@ -1131,17 +1134,22 @@ static int ext2_statfs (struct dentry * 
>  	buf->f_bfree = ext2_count_free_blocks(sb);
> +	es->s_free_blocks_count = cpu_to_le32(buf->f_bfree);
>  	buf->f_ffree = ext2_count_free_inodes(sb);
> +	es->s_free_inodes_count = cpu_to_le32(buf->f_ffree);

Hmm, this is still sub-optimal.  For ext3 and ext4 it just uses
percpu_counter_sum() instead of the slow ext*_count_free_blocks(), which
walks all of the groups.  Not that this is a reason to hold this patch,
because at least we are removing 1/2 of the overhead for ext2.

Cheers, Andreas
--
Andreas Dilger
Principal Software Engineer
Cluster File Systems, Inc.

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