[v4,05/19] workqueue: Manually break affinity on hotplug
diff mbox series

Message ID 20201023102346.464718669@infradead.org
State New, archived
Headers show
Series
  • sched: Migrate disable support
Related show

Commit Message

Peter Zijlstra Oct. 23, 2020, 10:12 a.m. UTC
Don't rely on the scheduler to force break affinity for us -- it will
stop doing that for per-cpu-kthreads.

Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Acked-by: Tejun Heo <tj@kernel.org>
---
 kernel/workqueue.c |    4 ++++
 1 file changed, 4 insertions(+)

Patch
diff mbox series

--- a/kernel/workqueue.c
+++ b/kernel/workqueue.c
@@ -4905,6 +4905,10 @@  static void unbind_workers(int cpu)
 		pool->flags |= POOL_DISASSOCIATED;
 
 		raw_spin_unlock_irq(&pool->lock);
+
+		for_each_pool_worker(worker, pool)
+			WARN_ON_ONCE(set_cpus_allowed_ptr(worker->task, cpu_active_mask) < 0);
+
 		mutex_unlock(&wq_pool_attach_mutex);
 
 		/*