From: Mark Brown <broonie@kernel.org>
To: Stefan Agner <stefan@agner.ch>
Cc: festevam@gmail.com, peterz@infradead.org, mingo@redhat.com,
linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org
Subject: Re: Lockdep warning when using REGCACHE_RBTREE
Date: Fri, 15 Jan 2016 16:28:32 +0000 [thread overview]
Message-ID: <20160115162832.GY6588@sirena.org.uk> (raw)
In-Reply-To: <44832539ca2bcc0be6e08260083363fe@agner.ch>
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On Thu, Jan 14, 2016 at 05:14:47PM -0800, Stefan Agner wrote:
> On a slightly other topic, I question whether REGCACHE_RBTREE is the
> right cache type for the DCU DRM driver. The driver has uses a regmap
> area of 1144 32-bit registers, the most space is used by the layer
> configuration registers which are 0x40 apart and 0x0-0x20 for each layer
> are actually used (hence somewhat above 50%).
> Would FLAT be the better cache type?
Yes, and if it's a MMIO device the performance of a flat cache is more
in line with the device performance.
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next prev parent reply other threads:[~2016-01-15 16:28 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-01-14 22:30 Stefan Agner
2016-01-15 0:01 ` Mark Brown
2016-01-15 1:14 ` Stefan Agner
2016-01-15 16:28 ` Mark Brown [this message]
2016-01-15 19:08 ` Stefan Agner
2016-01-15 9:45 ` Peter Zijlstra
2016-01-15 11:49 ` Mark Brown
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