Commit c9ec0524 authored Apr 21, 2020 by Peter Zijlstra

sched,drbd: Convert to sched_set_fifo*()



Because SCHED_FIFO is a broken scheduler model (see previous patches)
take away the priority field, the kernel can't possibly make an
informed decision.

In this case, use fifo_low, because it only cares about being above
SCHED_NORMAL. Effectively changes prio from 2 to 1.

Cc: axboe@kernel.dk
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Ingo Molnar <mingo@kernel.org>

parent 4ca6c1a0

drivers/block/drbd/drbd_receiver.c

+1 −2

Original line number	Diff line number	Diff line
		@@ -6019,9 +6019,8 @@ int drbd_ack_receiver(struct drbd_thread *thi)
		unsigned int header_size = drbd_header_size(connection);
		int expect = header_size;
		bool ping_timeout_active = false;
		struct sched_param param = { .sched_priority = 2 };

		rv = sched_setscheduler(current, SCHED_RR, &param);
		rv = sched_set_fifo_low(current);
		if (rv < 0)
		drbd_err(connection, "drbd_ack_receiver: ERROR set priority, ret=%d\n", rv);

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