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SubjectShould RCU_BOOST kernels use hrtimers in GP kthread?
Hello, Sebastian,

I punted on this for the moment by making RCU priority boosting testing
depend on CONFIG_PREEMPT_RT, but longer term I am wondering if RCU's
various timed delays and timeouts should use hrtimers rather than normal
timers in kernels built with CONFIG_RCU_BOOST. As it is, RCU priority
boosting can be defeated if any of the RCU grace-period kthread's timeouts
are serviced by the non-realtime ksoftirqd.

This might require things like swait_event_idle_hrtimeout_exclusive(),
either as primitives or just open coded.

Thoughts?

Thanx, Paul

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