On Thu, Jan 26, 2012 at 7:48 AM, Linus Walleij <linus.wall...@linaro.org> wrote:
> On Wed, Jan 25, 2012 at 3:02 PM, Mark Brown <broo...@sirena.org.uk> wrote:
>> On Tue, Jan 24, 2012 at 10:14:32PM +0100, Linus Walleij wrote:
>>> This switches the PL022 worker to a kthread in order to get
>>> hold of a mechanism to control the message pump priority. On
>>> low-latency systems elevating the message kthread to realtime
>>> priority give a real sleek response curve. This has been
>>> confirmed by measurements. Realtime priority elevation for
>>> a certain PL022 port can be requested from platform data.
>> It really feels like we should be pulling this into the core - lots of
>> drivers use a workqueue to drive data through the system and they're all
>> going to have exactly the same issue.
> That reads to me like the entire message queue and "transfer pump"
> mechanism from the PL022 driver should be made into generic
> code. That is the key ingredient from the PL022 driver that has
> allowed us to get real nice throughput on it.
> And that observation is correct, but a bit of upfront code.
> If Grant is in on it I might give it a try.

Go for it and see what it looks like.


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