$echo '0' > /sys/bus/workqueue/devices/xxx/numa $cat /sys/bus/workqueue/devices/xxx/numa I got 1. It should be 0, the reason is copy_workqueue_attrs() called in apply_workqueue_attrs() doesn't copy no_numa field. Fix it by making copy_workqueue_attrs() copy ->no_numa too. This would also make get_unbound_pool() set a pool's ->no_numa attribute according to the workqueue attributes used when the pool was created. While harmelss, as ->no_numa isn't a pool attribute, this is a bit confusing. Clear it explicitly. tj: Updated description and comments a bit.
Showing the changes to kernel/workqueue.c (1 of 1 file). Show all
Unified · Split
| @@ -3416,6 +3416,12 @@ static void copy_workqueue_attrs(struct workqueue_attrs *to, · 3415 unmodified lines | ||
| 3416 | 3416 | { |
| 3417 | 3417 | to->nice = from->nice; |
| 3418 | 3418 | cpumask_copy(to->cpumask, from->cpumask); |
| 3419 | + /* | |
| 3420 | + * Unlike hash and equality test, this function doesn't ignore | |
| 3421 | + * ->no_numa as it is used for both pool and wq attrs. Instead, | |
| 3422 | + * get_unbound_pool() explicitly clears ->no_numa after copying. | |
| 3423 | + */ | |
| 3424 | + to->no_numa = from->no_numa; | |
| 3419 | 3425 | } |
| 3420 | 3426 | |
| 3421 | 3427 | /* hash value of the content of @attr */ |
| @@ -3583,6 +3589,12 @@ static struct worker_pool *get_unbound_pool(const struct workqueue_attrs *attrs) · 161 unmodified lines | ||
| 3583 | 3589 | lockdep_set_subclass(&pool->lock, 1); /* see put_pwq() */ |
| 3584 | 3590 | copy_workqueue_attrs(pool->attrs, attrs); |
| 3585 | 3591 | |
| 3592 | + /* | |
| 3593 | + * no_numa isn't a worker_pool attribute, always clear it. See | |
| 3594 | + * 'struct workqueue_attrs' comments for detail. | |
| 3595 | + */ | |
| 3596 | + pool->attrs->no_numa = false; | |
| 3597 | + | |
| 3586 | 3598 | /* if cpumask is contained inside a NUMA node, we belong to that node */ |
| 3587 | 3599 | if (wq_numa_enabled) { |
| 3588 | 3600 | for_each_node(node) { |