linux-kernel - Re: regmap: no indexed caching?

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Message-ID: <20120119113916.GE3178@opensource.wolfsonmicro.com>
Date:	Thu, 19 Jan 2012 11:39:16 +0000
From:	Mark Brown <broonie@...nsource.wolfsonmicro.com>
To:	Wolfram Sang <w.sang@...gutronix.de>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: regmap: no indexed caching?

On Thu, Jan 19, 2012 at 12:37:08PM +0100, Wolfram Sang wrote:

> What about devices having just a few registers (4 in my case)? I'd think
> there are a number of such devices not yet converted to regmap. Is it
> assumed that the additional overhead from rbtree-caching will make up
> for the code saved?

There should be vanishingly little overhead from the rbtree, you'll just
end up with a single cache node containing all the registers (unless
they're widely separated numerically) - it may even be faster as we
don't need to search the array looking for the index.
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