From: Mark Brown <broonie@opensource.wolfsonmicro.com>
To: Wolfram Sang <w.sang@pengutronix.de>
Cc: linux-kernel@vger.kernel.org
Subject: Re: regmap: no indexed caching?
Date: Thu, 19 Jan 2012 11:39:16 +0000 [thread overview]
Message-ID: <20120119113916.GE3178@opensource.wolfsonmicro.com> (raw)
In-Reply-To: <20120119113708.GC2630@pengutronix.de>
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.
prev parent reply other threads:[~2012-01-19 11:39 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-01-19 11:37 regmap: no indexed caching? Wolfram Sang
2012-01-19 11:39 ` Mark Brown [this message]
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