linux-ext4 - Re: [PATCH] jbd2: Speedup jbd2_journal_dirty

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Message-ID: <20150706015445.GK8628@thunk.org>
Date:	Sun, 5 Jul 2015 21:54:45 -0400
From:	Theodore Ts'o <tytso@....edu>
To:	Jan Kara <jack@...e.com>
Cc:	linux-ext4@...r.kernel.org, Ming Lei <tom.leiming@...il.com>,
	Jan Kara <jack@...e.cz>
Subject: Re: [PATCH] jbd2: Speedup jbd2_journal_dirty_metadata()

On Fri, Jul 03, 2015 at 07:37:12PM +0200, Jan Kara wrote:
> From: Jan Kara <jack@...e.cz>
> 
> It is often the case that we mark buffer as having dirty metadata when
> the buffer is already in that state (frequent for bitmaps, inode table
> blocks, superblock). Thus it is unnecessary to contend on grabbing
> journal head reference and bh_state lock. Avoid that by checking whether
> any modification to the buffer is needed before grabbing any locks or
> references.
> 
> Signed-off-by: Jan Kara <jack@...e.cz>

Applied, thanks.

					- Ted
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