linux-ext4 - Re: [PATCH] ext4: ext4_trim_fs() load buddy only when it is needed

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Message-ID: <20110524221818.GH26055@thunk.org>
Date:	Tue, 24 May 2011 18:18:18 -0400
From:	Ted Ts'o <tytso@....edu>
To:	Lukas Czerner <lczerner@...hat.com>
Cc:	linux-ext4@...r.kernel.org
Subject: Re: [PATCH] ext4: ext4_trim_fs() load buddy only when it is needed

On Mon, Apr 18, 2011 at 06:32:31PM +0200, Lukas Czerner wrote:
> Currently we are loading buddy ext4_mb_load_buddy() for every block
> group we are going through in ext4_trim_fs() in many cases just to find
> out that there is not enough space to be bothered with. As Amir Goldstein
> suggested we can use bb_free information directly from ext4_group_info.
> 
> This commit removes ext4_mb_load_buddy() from ext4_trim_fs() and rather
> get the ext4_group_info via ext4_get_group_info() and use the bb_free
> information directly from that. This avoids unnecessary call to load
> buddy in the case the group does not have enough free space to trim.
> Loading buddy is now moved to ext4_trim_all_free().
> 
> Tested by me with xfstests 251.
> 
> Signed-off-by: Lukas Czerner <lczerner@...hat.com>

I just added this patch to the ext4 tree.  Apologies for not noticing
it earlier.  I had to make a few adjustments to make the patch apply,
but nothing major.

						- Ted
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