sched_ext: Use ktime_get_ns() instead of rq_clock_task() in touch_core_sched()
Since sched_ext: Unpin and repin rq lock from balance_scx(), sched_ext's
balance path terminates rq_pin in the outermost function. This is simpler
and in line with what other balance functions are doing but it loses control
over rq->clock_update_flags which makes assert_clock_udpated() trigger if
other CPUs pins the rq lock.
The only place this matters is touch_core_sched() which uses the timestamp
to order tasks from sibling rq's. For now, switch to ktime_get_ns(). Later,
it'd be better to use per-core dispatch sequence number.
Signed-off-by: Tejun Heo <tj@kernel.org>
Fixes: 3cf78c5d01d6 ("sched_ext: Unpin and repin rq lock from balance_scx()")
Cc: Peter Zijlstra <peterz@infradead.org>
1 file changed
