io_uring: One wqe per wq
Right now io_wq allocates one io_wqe per NUMA node. As io_wq is now bound to a task, the task basically uses only the NUMA local io_wqe, and almost never changes NUMA nodes, thus, the other wqes are mostly unused. Allocate just one io_wqe embedded into io_wq, and uses all possible cpus (cpu_possible_mask) in the io_wqe->cpumask. Signed-off-by: Breno Leitao <leitao@debian.org> Link: https://lore.kernel.org/r/20230310201107.4020580-1-leitao@debian.org Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Breno Leitao
Jens Axboe
parent
c56e022c0a
commit
da64d6db3b
@ -15,6 +15,7 @@
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#include <linux/cpu.h>
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#include <linux/task_work.h>
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#include <linux/audit.h>
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#include <linux/mmu_context.h>
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#include <uapi/linux/io_uring.h>
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#include "io-wq.h"
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@ -96,8 +97,6 @@ struct io_wqe {
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raw_spinlock_t lock;
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struct io_wqe_acct acct[IO_WQ_ACCT_NR];
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int node;
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struct hlist_nulls_head free_list;
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struct list_head all_list;
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@ -127,7 +126,7 @@ struct io_wq {
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struct task_struct *task;
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struct io_wqe *wqes[];
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struct io_wqe wqe;
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};
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static enum cpuhp_state io_wq_online;
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@ -754,7 +753,7 @@ static void create_worker_cont(struct callback_head *cb)
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worker = container_of(cb, struct io_worker, create_work);
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clear_bit_unlock(0, &worker->create_state);
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wqe = worker->wqe;
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tsk = create_io_thread(io_wqe_worker, worker, wqe->node);
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tsk = create_io_thread(io_wqe_worker, worker, NUMA_NO_NODE);
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if (!IS_ERR(tsk)) {
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io_init_new_worker(wqe, worker, tsk);
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io_worker_release(worker);
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@ -804,7 +803,7 @@ static bool create_io_worker(struct io_wq *wq, struct io_wqe *wqe, int index)
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__set_current_state(TASK_RUNNING);
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worker = kzalloc_node(sizeof(*worker), GFP_KERNEL, wqe->node);
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worker = kzalloc(sizeof(*worker), GFP_KERNEL);
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if (!worker) {
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fail:
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atomic_dec(&acct->nr_running);
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@ -823,7 +822,7 @@ fail:
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if (index == IO_WQ_ACCT_BOUND)
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worker->flags |= IO_WORKER_F_BOUND;
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tsk = create_io_thread(io_wqe_worker, worker, wqe->node);
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tsk = create_io_thread(io_wqe_worker, worker, NUMA_NO_NODE);
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if (!IS_ERR(tsk)) {
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io_init_new_worker(wqe, worker, tsk);
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} else if (!io_should_retry_thread(PTR_ERR(tsk))) {
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@ -961,7 +960,7 @@ static void io_wqe_enqueue(struct io_wqe *wqe, struct io_wq_work *work)
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void io_wq_enqueue(struct io_wq *wq, struct io_wq_work *work)
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{
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struct io_wqe *wqe = wq->wqes[numa_node_id()];
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struct io_wqe *wqe = &wq->wqe;
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io_wqe_enqueue(wqe, work);
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}
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@ -1083,7 +1082,7 @@ enum io_wq_cancel io_wq_cancel_cb(struct io_wq *wq, work_cancel_fn *cancel,
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.data = data,
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.cancel_all = cancel_all,
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};
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int node;
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struct io_wqe *wqe = &wq->wqe;
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/*
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* First check pending list, if we're lucky we can just remove it
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@ -1098,9 +1097,6 @@ enum io_wq_cancel io_wq_cancel_cb(struct io_wq *wq, work_cancel_fn *cancel,
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* Do both of these while holding the wqe->lock, to ensure that
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* we'll find a work item regardless of state.
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*/
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for_each_node(node) {
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struct io_wqe *wqe = wq->wqes[node];
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io_wqe_cancel_pending_work(wqe, &match);
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if (match.nr_pending && !match.cancel_all)
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return IO_WQ_CANCEL_OK;
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@ -1110,7 +1106,6 @@ enum io_wq_cancel io_wq_cancel_cb(struct io_wq *wq, work_cancel_fn *cancel,
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raw_spin_unlock(&wqe->lock);
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if (match.nr_running && !match.cancel_all)
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return IO_WQ_CANCEL_RUNNING;
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}
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if (match.nr_running)
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return IO_WQ_CANCEL_RUNNING;
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@ -1140,15 +1135,16 @@ static int io_wqe_hash_wake(struct wait_queue_entry *wait, unsigned mode,
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struct io_wq *io_wq_create(unsigned bounded, struct io_wq_data *data)
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{
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int ret, node, i;
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int ret, i;
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struct io_wq *wq;
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struct io_wqe *wqe;
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if (WARN_ON_ONCE(!data->free_work || !data->do_work))
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return ERR_PTR(-EINVAL);
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if (WARN_ON_ONCE(!bounded))
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return ERR_PTR(-EINVAL);
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wq = kzalloc(struct_size(wq, wqes, nr_node_ids), GFP_KERNEL);
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wq = kzalloc(sizeof(struct io_wq), GFP_KERNEL);
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if (!wq)
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return ERR_PTR(-ENOMEM);
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ret = cpuhp_state_add_instance_nocalls(io_wq_online, &wq->cpuhp_node);
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@ -1159,22 +1155,13 @@ struct io_wq *io_wq_create(unsigned bounded, struct io_wq_data *data)
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wq->hash = data->hash;
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wq->free_work = data->free_work;
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wq->do_work = data->do_work;
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wqe = &wq->wqe;
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ret = -ENOMEM;
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for_each_node(node) {
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struct io_wqe *wqe;
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int alloc_node = node;
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if (!node_online(alloc_node))
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alloc_node = NUMA_NO_NODE;
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wqe = kzalloc_node(sizeof(struct io_wqe), GFP_KERNEL, alloc_node);
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if (!wqe)
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goto err;
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wq->wqes[node] = wqe;
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if (!alloc_cpumask_var(&wqe->cpu_mask, GFP_KERNEL))
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goto err;
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cpumask_copy(wqe->cpu_mask, cpumask_of_node(node));
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wqe->node = alloc_node;
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cpumask_copy(wqe->cpu_mask, cpu_possible_mask);
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wqe->acct[IO_WQ_ACCT_BOUND].max_workers = bounded;
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wqe->acct[IO_WQ_ACCT_UNBOUND].max_workers =
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task_rlimit(current, RLIMIT_NPROC);
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@ -1192,7 +1179,6 @@ struct io_wq *io_wq_create(unsigned bounded, struct io_wq_data *data)
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raw_spin_lock_init(&wqe->lock);
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INIT_HLIST_NULLS_HEAD(&wqe->free_list, 0);
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INIT_LIST_HEAD(&wqe->all_list);
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}
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wq->task = get_task_struct(data->task);
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atomic_set(&wq->worker_refs, 1);
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@ -1201,12 +1187,8 @@ struct io_wq *io_wq_create(unsigned bounded, struct io_wq_data *data)
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err:
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io_wq_put_hash(data->hash);
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cpuhp_state_remove_instance_nocalls(io_wq_online, &wq->cpuhp_node);
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for_each_node(node) {
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if (!wq->wqes[node])
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continue;
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free_cpumask_var(wq->wqes[node]->cpu_mask);
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kfree(wq->wqes[node]);
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}
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free_cpumask_var(wq->wqe.cpu_mask);
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err_wq:
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kfree(wq);
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return ERR_PTR(ret);
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@ -1247,48 +1229,36 @@ static void io_wq_cancel_tw_create(struct io_wq *wq)
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static void io_wq_exit_workers(struct io_wq *wq)
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{
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int node;
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if (!wq->task)
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return;
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io_wq_cancel_tw_create(wq);
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rcu_read_lock();
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for_each_node(node) {
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struct io_wqe *wqe = wq->wqes[node];
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io_wq_for_each_worker(wqe, io_wq_worker_wake, NULL);
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}
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io_wq_for_each_worker(&wq->wqe, io_wq_worker_wake, NULL);
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rcu_read_unlock();
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io_worker_ref_put(wq);
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wait_for_completion(&wq->worker_done);
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for_each_node(node) {
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spin_lock_irq(&wq->hash->wait.lock);
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list_del_init(&wq->wqes[node]->wait.entry);
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list_del_init(&wq->wqe.wait.entry);
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spin_unlock_irq(&wq->hash->wait.lock);
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}
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put_task_struct(wq->task);
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wq->task = NULL;
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}
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static void io_wq_destroy(struct io_wq *wq)
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{
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int node;
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cpuhp_state_remove_instance_nocalls(io_wq_online, &wq->cpuhp_node);
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for_each_node(node) {
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struct io_wqe *wqe = wq->wqes[node];
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struct io_cb_cancel_data match = {
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.fn = io_wq_work_match_all,
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.cancel_all = true,
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};
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struct io_wqe *wqe = &wq->wqe;
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cpuhp_state_remove_instance_nocalls(io_wq_online, &wq->cpuhp_node);
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io_wqe_cancel_pending_work(wqe, &match);
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free_cpumask_var(wqe->cpu_mask);
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kfree(wqe);
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}
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io_wq_put_hash(wq->hash);
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kfree(wq);
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}
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@ -1323,11 +1293,9 @@ static int __io_wq_cpu_online(struct io_wq *wq, unsigned int cpu, bool online)
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.cpu = cpu,
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.online = online
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};
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int i;
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rcu_read_lock();
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for_each_node(i)
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io_wq_for_each_worker(wq->wqes[i], io_wq_worker_affinity, &od);
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io_wq_for_each_worker(&wq->wqe, io_wq_worker_affinity, &od);
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rcu_read_unlock();
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return 0;
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}
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@ -1348,18 +1316,15 @@ static int io_wq_cpu_offline(unsigned int cpu, struct hlist_node *node)
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int io_wq_cpu_affinity(struct io_wq *wq, cpumask_var_t mask)
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{
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int i;
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struct io_wqe *wqe = &wq->wqe;
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rcu_read_lock();
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for_each_node(i) {
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struct io_wqe *wqe = wq->wqes[i];
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if (mask)
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cpumask_copy(wqe->cpu_mask, mask);
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else
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cpumask_copy(wqe->cpu_mask, cpumask_of_node(i));
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}
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cpumask_copy(wqe->cpu_mask, cpu_possible_mask);
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rcu_read_unlock();
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return 0;
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}
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@ -1369,9 +1334,10 @@ int io_wq_cpu_affinity(struct io_wq *wq, cpumask_var_t mask)
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*/
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int io_wq_max_workers(struct io_wq *wq, int *new_count)
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{
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struct io_wqe *wqe = &wq->wqe;
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struct io_wqe_acct *acct;
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int prev[IO_WQ_ACCT_NR];
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bool first_node = true;
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int i, node;
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int i;
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BUILD_BUG_ON((int) IO_WQ_ACCT_BOUND != (int) IO_WQ_BOUND);
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BUILD_BUG_ON((int) IO_WQ_ACCT_UNBOUND != (int) IO_WQ_UNBOUND);
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@ -1386,21 +1352,15 @@ int io_wq_max_workers(struct io_wq *wq, int *new_count)
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prev[i] = 0;
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rcu_read_lock();
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for_each_node(node) {
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struct io_wqe *wqe = wq->wqes[node];
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struct io_wqe_acct *acct;
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raw_spin_lock(&wqe->lock);
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for (i = 0; i < IO_WQ_ACCT_NR; i++) {
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acct = &wqe->acct[i];
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if (first_node)
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prev[i] = max_t(int, acct->max_workers, prev[i]);
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if (new_count[i])
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acct->max_workers = new_count[i];
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}
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raw_spin_unlock(&wqe->lock);
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first_node = false;
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}
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rcu_read_unlock();
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for (i = 0; i < IO_WQ_ACCT_NR; i++)
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