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.
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