Re: [patch] Real-Time Preemption, -RT-2.6.10-rc2-mm3-V0.7.32-6

[Ingo Molnar]

* Steven Rostedt <rostedt@xxxxxxxxxxx> wrote:

> [RFC] Has there been previously any thought of adding priority
> inheriting wait queues. [...]

this will make sense at a certain point.

> [...] it would really help to solve the problem of a high priority
> process waiting for an interrupt that can be starved by other high
> priority processes.

the primary use i think would be kernel-internal task <-> task
waitqueues such as the futex queues, to transport the effects of RT
priorities across waitqueues as well. IRQ related waitqueues are a nice
'side-effect'.

another next step would be to transport PI effects to userspace code,
for user-controlled synchronization objects such as futexes or e.g. SysV
semaphores.

	Ingo
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