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

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Message-Id: <200804101613.48465.arnd@arndb.de>
Date:	Thu, 10 Apr 2008 16:13:47 +0200
From:	Arnd Bergmann <arnd@...db.de>
To:	joern@...fs.org
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 Tuesday 01 April 2008, joern@...fs.org wrote:
> +
> +static DEFINE_MUTEX(compr_mutex);
> +static struct z_stream_s stream;
> +

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.

	Arnd <><
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