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

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Date:	Wed, 04 Jul 2007 20:51:07 -0700
From:	Badari Pulavarty <pbadari@...il.com>
To:	Andreas Dilger <adilger@...sterfs.com>
Cc:	ext4 <linux-ext4@...r.kernel.org>
Subject: Re: [PATCH] speed up statfs

On Wed, 2007-07-04 at 16:23 -0600, Andreas Dilger wrote:
> Hi,
> this is a patch we are currently using that speeds up statfs.
> It is very simple - the "overhead" calculation, which takes a
> huge amount of time for large filesystems, never changes unless
> the size of the filesystem itself changes.  That means we can
> store it in memory and only recalculate if the filesystem has
> been resized (almost never).
> 
> It is based on ext3 but is trivally updated to ext4.  It also
> fixes a minor problem that we never update the on-disk superblock
> free blocks/inodes counts until the filesystem is unmounted.
> While not fatal, we may as well update that on disk when we have
> the information, and it makes things like debugfs and dumpe2fs
> report a bit more accurate info.
> 
> I'd be happy if someone could update this to the latest kernel and
> for ext2 and ext4 also.
> 

I forward ported it to latest + did the same for ext2 and ext4 also.
Compiles fine. I will post them tomorrow after little testing.

Thanks,
Badaru

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