Hi Nathan,
The chunk below causes sched_pin() to stop working and should be removed
from your commit ??!!
It probably explains the hangs seen recently reported by various brave
people running 12-current :-)
Specifically I see threads migrating between CPUs when td->td_pinned > 0
using the LinuxKPI RCU API, which in turn leads to a hang when trying to
synchronize RCU.
--HPS
diff --git a/sys/kern/sched_ule.c b/sys/kern/sched_ule.c
index 5c8bae5afa1..bd4b505f6c3 100644
--- a/sys/kern/sched_ule.c
+++ b/sys/kern/sched_ule.c
@@ -2453,7 +2453,7 @@ sched_add(struct thread *td, int flags)
* Pick the destination cpu and if it isn't ours transfer to the
* target cpu.
*/
- td_get_sched(td)->ts_cpu = curcpu; /* Pick something valid to
start */
+// td_get_sched(td)->ts_cpu = curcpu; /* Pick something valid to
start */
cpu = sched_pickcpu(td, flags);
tdq = sched_setcpu(td, cpu, flags);
tdq_add(tdq, td, flags);
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