On Tue, Apr 30, 2024 at 11:37:29AM -0700, Ankur Arora wrote: > Add architectural support for the cpuidle-haltpoll driver by defining > arch_haltpoll_*(). Also select ARCH_HAS_OPTIMIZED_POLL since we have > an optimized polling mechanism via smp_cond_load*(). > > Add the configuration option, ARCH_CPUIDLE_HALTPOLL to allow > cpuidle-haltpoll to be selected. > > Note that we limit cpuidle-haltpoll support to when the event-stream is > available. This is necessary because polling via smp_cond_load_relaxed() > uses WFE to wait for a store which might not happen for an prolonged > period of time. So, ensure the event-stream is around to provide a > terminating condition. > Currently the event stream is configured 10kHz(1 signal per 100uS IIRC). But the information in the cpuidle states for exit latency and residency is set to 0(as per drivers/cpuidle/poll_state.c). Will this not cause any performance issues ? -- Regards, Sudeep
