08.04.2020 01:08, Dmitry Osipenko пишет: > 08.04.2020 00:08, Sowjanya Komatineni пишет: > ... >>>> I think you need a semaphore with resource count = 2. >>> we hold on to issuing capture if more than 2 buffers are queued and it >>> continues only after fifo has min 1 slot empty >> >> >> Just want to close on this part of feedback. Hope above explanation is >> clear regarding triggering/issuing at max 2 frame capture to VI HW and >> also regarding capture threads where they use wait_event_interruptible >> to prevent blocking waiting for buffers to be available for captures. >> >> So no changes related to this part are needed in v7. > From what I see in the code, you "hold on" by making kthread to spin in > a busy-loop while caps_inflight >= SYNCPT_FIFO_DEPTH. So some change > should be needed to prevent this. Looks like some other media drivers do: schedule_timeout_uninterruptible(1); to avoid CPU hogging when contention is detected.
