linux-kernel - Re: [patch 4/15] fs/logfs/compr.c

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Message-ID: <20080411104128.GG25462@logfs.org>
Date:	Fri, 11 Apr 2008 12:41:28 +0200
From:	Jörn Engel <joern@...fs.org>
To:	Arnd Bergmann <arnd@...db.de>
Cc:	linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
	linux-mtd@...ts.infradead.org
Subject: Re: [patch 4/15] fs/logfs/compr.c

On Thu, 10 April 2008 16:13:47 +0200, Arnd Bergmann wrote:
> 
> How much time is spent in the compression code? Would it be helpful
> to have a percpu stream and do preempt_disable around it instead
> of the mutex?
> 
> That would improve parallelism and cache-locality of the compression,
> at the cost of adding a source of latency to preemptible kernels.

Several years back (before logfs) I was planning to do just that.  It
turned out that ipsec doesn't work in such a fashion, because each
connection is a stream.  And the two block-oriented users, jffs2 and
cramfs just weren't worth it.

Might be a good idea by now.  I guess it should become self-contained
code, so that jffs2, cramfs and ubifs can use it as well.

Jörn

-- 
Write programs that do one thing and do it well. Write programs to work
together. Write programs to handle text streams, because that is a
universal interface.
-- Doug MacIlroy
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