When worker tasks are created using kthread_create_on_node(), currently only per-cpu ones have the matching NUMA node specified. All unbound workers are always created with NUMA_NO_NODE. Now that an unbound worker pool may have an arbitrary cpumask associated with it, this isn't optimal. Add pool->node which is determined by the pool's cpumask. If the pool's cpumask is contained inside a NUMA node proper, the pool is associated with that node, and all workers of the pool are created on that node. This currently only makes difference for unbound worker pools with cpumask contained inside single NUMA node, but this will serve as foundation for making all unbound pools NUMA-affine.
Showing the changes to kernel/workqueue.c (1 of 1 file). Show all
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| @@ -138,6 +138,7 @@ enum { · 137 unmodified lines | ||
| 138 | 138 | struct worker_pool { |
| 139 | 139 | spinlock_t lock; /* the pool lock */ |
| 140 | 140 | int cpu; /* I: the associated cpu */ |
| 141 | + int node; /* I: the associated node ID */ | |
| 141 | 142 | int id; /* I: pool ID */ |
| 142 | 143 | unsigned int flags; /* X: flags */ |
| 143 | 144 | |
| @@ -1645,7 +1646,6 @@ static struct worker *alloc_worker(void) · 1501 unmodified lines | ||
| 1645 | 1646 | static struct worker *create_worker(struct worker_pool *pool) |
| 1646 | 1647 | { |
| 1647 | 1648 | struct worker *worker = NULL; |
| 1648 | − int node = pool->cpu >= 0 ? cpu_to_node(pool->cpu) : NUMA_NO_NODE; | |
| 1649 | 1649 | int id = -1; |
| 1650 | 1650 | char id_buf[16]; |
| 1651 | 1651 | |
| @@ -1678,7 +1678,7 @@ static struct worker *create_worker(struct worker_pool *pool) · 26 unmodified lines | ||
| 1678 | 1678 | else |
| 1679 | 1679 | snprintf(id_buf, sizeof(id_buf), "u%d:%d", pool->id, id); |
| 1680 | 1680 | |
| 1681 | − worker->task = kthread_create_on_node(worker_thread, worker, node, | |
| 1681 | + worker->task = kthread_create_on_node(worker_thread, worker, pool->node, | |
| 1682 | 1682 | "kworker/%s", id_buf); |
| 1683 | 1683 | if (IS_ERR(worker->task)) |
| 1684 | 1684 | goto fail; |
| @@ -3360,6 +3360,7 @@ static int init_worker_pool(struct worker_pool *pool) · 1675 unmodified lines | ||
| 3360 | 3360 | spin_lock_init(&pool->lock); |
| 3361 | 3361 | pool->id = -1; |
| 3362 | 3362 | pool->cpu = -1; |
| 3363 | + pool->node = NUMA_NO_NODE; | |
| 3363 | 3364 | pool->flags |= POOL_DISASSOCIATED; |
| 3364 | 3365 | INIT_LIST_HEAD(&pool->worklist); |
| 3365 | 3366 | INIT_LIST_HEAD(&pool->idle_list); |
| @@ -3465,6 +3466,7 @@ static struct worker_pool *get_unbound_pool(const struct workqueue_attrs *attrs) · 99 unmodified lines | ||
| 3465 | 3466 | { |
| 3466 | 3467 | u32 hash = wqattrs_hash(attrs); |
| 3467 | 3468 | struct worker_pool *pool; |
| 3469 | + int node; | |
| 3468 | 3470 | |
| 3469 | 3471 | lockdep_assert_held(&wq_pool_mutex); |
| 3470 | 3472 | |
| @@ -3487,6 +3489,17 @@ static struct worker_pool *get_unbound_pool(const struct workqueue_attrs *attrs) · 16 unmodified lines | ||
| 3487 | 3489 | lockdep_set_subclass(&pool->lock, 1); /* see put_pwq() */ |
| 3488 | 3490 | copy_workqueue_attrs(pool->attrs, attrs); |
| 3489 | 3491 | |
| 3492 | + /* if cpumask is contained inside a NUMA node, we belong to that node */ | |
| 3493 | + if (wq_numa_enabled) { | |
| 3494 | + for_each_node(node) { | |
| 3495 | + if (cpumask_subset(pool->attrs->cpumask, | |
| 3496 | + wq_numa_possible_cpumask[node])) { | |
| 3497 | + pool->node = node; | |
| 3498 | + break; | |
| 3499 | + } | |
| 3500 | + } | |
| 3501 | + } | |
| 3502 | + | |
| 3490 | 3503 | if (worker_pool_assign_id(pool) < 0) |
| 3491 | 3504 | goto fail; |
| 3492 | 3505 | |
| @@ -4480,6 +4493,7 @@ static int __init init_workqueues(void) · 987 unmodified lines | ||
| 4480 | 4493 | pool->cpu = cpu; |
| 4481 | 4494 | cpumask_copy(pool->attrs->cpumask, cpumask_of(cpu)); |
| 4482 | 4495 | pool->attrs->nice = std_nice[i++]; |
| 4496 | + pool->node = cpu_to_node(cpu); | |
| 4483 | 4497 | |
| 4484 | 4498 | /* alloc pool ID */ |
| 4485 | 4499 | mutex_lock(&wq_pool_mutex); |