On 03/30/2016 03:52 PM, Clark Williams wrote:
> On Wed, 30 Mar 2016 12:22:51 +0200
> I'm seeing output like this with between 3 and 9 wakeups per kworker:
same here. And with
--- a/kernel/sched/swait.c
+++ b/kernel/sched/swait.c
@@ -32,17 +32,24 @@ EXPORT_SYMBOL(swake_up_locked);
void swake_up_all_locked(struct swait_queue_head *q)
{
struct swait_queue *curr;
+ char comms[512];
int wakes = 0;
+ comms[0] = '\0';
while (!list_empty(&q->task_list)) {
curr = list_first_entry(&q->task_list, typeof(*curr),
task_list);
+ strcat(comms, curr->task->comm);
+ strcat(comms, " ");
wake_up_process(curr->task);
list_del_init(&curr->task_list);
wakes++;
}
- WARN_ON(wakes > 2);
+ if (wakes > 2) {
+ pr_err("%s(%d) %d\n", __func__, __LINE__, wakes);
+ pr_err("%s(%d) %s\n", __func__, __LINE__, comms);
+ }
}
EXPORT_SYMBOL(swake_up_all_locked);
you would see that it wakes other kworker :)
Sebastian
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