linux-ext4 - Re: [PATCH 4/5] ext4: Speed up FITRIM by recording flags in ext4_group

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Message-ID: <20110711040727.GH28763@thunk.org>
Date:	Mon, 11 Jul 2011 00:07:27 -0400
From:	Ted Ts'o <tytso@....edu>
To:	Tao Ma <tm@....ma>
Cc:	linux-ext4@...r.kernel.org, Lukas Czerner <lczerner@...hat.com>
Subject: Re: [PATCH 4/5] ext4: Speed up FITRIM by recording flags in
 ext4_group_info.

On Fri, Jul 01, 2011 at 11:27:55PM +0800, Tao Ma wrote:
> From: Tao Ma <boyu.mt@...bao.com>
> 
> In ext4, when FITRIM is called every time, we iterate all the
> groups and do trim one by one. It is a bit time wasting if the
> group has been trimmed and there is no change since the last
> trim.
> 
> So this patch adds a new flag in ext4_group_info->bb_state to
> indicate that the group has been trimmed, and it will be cleared
> if some blocks is freed(in release_blocks_on_commit). Another
> trim_minlen is added in ext4_sb_info to record the last minlen
> we use to trim the volume, so that if the caller provide a small
> one, we will go on the trim regardless of the bb_state.

Added to the ext4 tree, thanks.

					- Ted
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