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io_uring: One wqe per wq

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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 2023-03-10 12:11:07 -08:00 committed by Jens Axboe
parent c56e022c0a
commit da64d6db3b
1 changed files with 68 additions and 108 deletions
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176
io_uring/io-wq.c
View file

@ -15,6 +15,7 @@
#include <linux/cpu.h>
#include <linux/task_work.h>
#include <linux/audit.h>
#include <linux/mmu_context.h>
#include <uapi/linux/io_uring.h>
#include "io-wq.h"
@ -96,8 +97,6 @@ struct io_wqe {
raw_spinlock_t lock;
struct io_wqe_acct acct[IO_WQ_ACCT_NR];
int node;
struct hlist_nulls_head free_list;
struct list_head all_list;
@ -127,7 +126,7 @@ struct io_wq {
struct task_struct *task;
struct io_wqe *wqes[];
struct io_wqe wqe;
};
static enum cpuhp_state io_wq_online;
@ -754,7 +753,7 @@ static void create_worker_cont(struct callback_head *cb)
worker = container_of(cb, struct io_worker, create_work);
clear_bit_unlock(0, &worker->create_state);
wqe = worker->wqe;
tsk = create_io_thread(io_wqe_worker, worker, wqe->node);
tsk = create_io_thread(io_wqe_worker, worker, NUMA_NO_NODE);
if (!IS_ERR(tsk)) {
io_init_new_worker(wqe, worker, tsk);
io_worker_release(worker);
@ -804,7 +803,7 @@ static bool create_io_worker(struct io_wq *wq, struct io_wqe *wqe, int index)
__set_current_state(TASK_RUNNING);
worker = kzalloc_node(sizeof(*worker), GFP_KERNEL, wqe->node);
worker = kzalloc(sizeof(*worker), GFP_KERNEL);
if (!worker) {
fail:
atomic_dec(&acct->nr_running);
@ -823,7 +822,7 @@ static bool create_io_worker(struct io_wq *wq, struct io_wqe *wqe, int index)
if (index == IO_WQ_ACCT_BOUND)
worker->flags |= IO_WORKER_F_BOUND;
tsk = create_io_thread(io_wqe_worker, worker, wqe->node);
tsk = create_io_thread(io_wqe_worker, worker, NUMA_NO_NODE);
if (!IS_ERR(tsk)) {
io_init_new_worker(wqe, worker, tsk);
} else if (!io_should_retry_thread(PTR_ERR(tsk))) {
@ -961,7 +960,7 @@ static void io_wqe_enqueue(struct io_wqe *wqe, struct io_wq_work *work)
void io_wq_enqueue(struct io_wq *wq, struct io_wq_work *work)
{
struct io_wqe *wqe = wq->wqes[numa_node_id()];
struct io_wqe *wqe = &wq->wqe;
io_wqe_enqueue(wqe, work);
}
@ -1083,7 +1082,7 @@ enum io_wq_cancel io_wq_cancel_cb(struct io_wq *wq, work_cancel_fn *cancel,
.data = data,
.cancel_all = cancel_all,
};
int node;
struct io_wqe *wqe = &wq->wqe;
/*
* First check pending list, if we're lucky we can just remove it
@ -1098,19 +1097,15 @@ enum io_wq_cancel io_wq_cancel_cb(struct io_wq *wq, work_cancel_fn *cancel,
* Do both of these while holding the wqe->lock, to ensure that
* we'll find a work item regardless of state.
*/
for_each_node(node) {
struct io_wqe *wqe = wq->wqes[node];
io_wqe_cancel_pending_work(wqe, &match);
if (match.nr_pending && !match.cancel_all)
return IO_WQ_CANCEL_OK;
io_wqe_cancel_pending_work(wqe, &match);
if (match.nr_pending && !match.cancel_all)
return IO_WQ_CANCEL_OK;
raw_spin_lock(&wqe->lock);
io_wqe_cancel_running_work(wqe, &match);
raw_spin_unlock(&wqe->lock);
if (match.nr_running && !match.cancel_all)
return IO_WQ_CANCEL_RUNNING;
}
raw_spin_lock(&wqe->lock);
io_wqe_cancel_running_work(wqe, &match);
raw_spin_unlock(&wqe->lock);
if (match.nr_running && !match.cancel_all)
return IO_WQ_CANCEL_RUNNING;
if (match.nr_running)
return IO_WQ_CANCEL_RUNNING;
@ -1140,15 +1135,16 @@ static int io_wqe_hash_wake(struct wait_queue_entry *wait, unsigned mode,
struct io_wq *io_wq_create(unsigned bounded, struct io_wq_data *data)
{
int ret, node, i;
int ret, i;
struct io_wq *wq;
struct io_wqe *wqe;
if (WARN_ON_ONCE(!data->free_work || !data->do_work))
return ERR_PTR(-EINVAL);
if (WARN_ON_ONCE(!bounded))
return ERR_PTR(-EINVAL);
wq = kzalloc(struct_size(wq, wqes, nr_node_ids), GFP_KERNEL);
wq = kzalloc(sizeof(struct io_wq), GFP_KERNEL);
if (!wq)
return ERR_PTR(-ENOMEM);
ret = cpuhp_state_add_instance_nocalls(io_wq_online, &wq->cpuhp_node);
@ -1159,40 +1155,30 @@ struct io_wq *io_wq_create(unsigned bounded, struct io_wq_data *data)
wq->hash = data->hash;
wq->free_work = data->free_work;
wq->do_work = data->do_work;
wqe = &wq->wqe;
ret = -ENOMEM;
for_each_node(node) {
struct io_wqe *wqe;
int alloc_node = node;
if (!node_online(alloc_node))
alloc_node = NUMA_NO_NODE;
wqe = kzalloc_node(sizeof(struct io_wqe), GFP_KERNEL, alloc_node);
if (!wqe)
goto err;
wq->wqes[node] = wqe;
if (!alloc_cpumask_var(&wqe->cpu_mask, GFP_KERNEL))
goto err;
cpumask_copy(wqe->cpu_mask, cpumask_of_node(node));
wqe->node = alloc_node;
wqe->acct[IO_WQ_ACCT_BOUND].max_workers = bounded;
wqe->acct[IO_WQ_ACCT_UNBOUND].max_workers =
task_rlimit(current, RLIMIT_NPROC);
INIT_LIST_HEAD(&wqe->wait.entry);
wqe->wait.func = io_wqe_hash_wake;
for (i = 0; i < IO_WQ_ACCT_NR; i++) {
struct io_wqe_acct *acct = &wqe->acct[i];
if (!alloc_cpumask_var(&wqe->cpu_mask, GFP_KERNEL))
goto err;
cpumask_copy(wqe->cpu_mask, cpu_possible_mask);
wqe->acct[IO_WQ_ACCT_BOUND].max_workers = bounded;
wqe->acct[IO_WQ_ACCT_UNBOUND].max_workers =
task_rlimit(current, RLIMIT_NPROC);
INIT_LIST_HEAD(&wqe->wait.entry);
wqe->wait.func = io_wqe_hash_wake;
for (i = 0; i < IO_WQ_ACCT_NR; i++) {
struct io_wqe_acct *acct = &wqe->acct[i];
acct->index = i;
atomic_set(&acct->nr_running, 0);
INIT_WQ_LIST(&acct->work_list);
raw_spin_lock_init(&acct->lock);
}
wqe->wq = wq;
raw_spin_lock_init(&wqe->lock);
INIT_HLIST_NULLS_HEAD(&wqe->free_list, 0);
INIT_LIST_HEAD(&wqe->all_list);
acct->index = i;
atomic_set(&acct->nr_running, 0);
INIT_WQ_LIST(&acct->work_list);
raw_spin_lock_init(&acct->lock);
}
wqe->wq = wq;
raw_spin_lock_init(&wqe->lock);
INIT_HLIST_NULLS_HEAD(&wqe->free_list, 0);
INIT_LIST_HEAD(&wqe->all_list);
wq->task = get_task_struct(data->task);
atomic_set(&wq->worker_refs, 1);
@ -1201,12 +1187,8 @@ struct io_wq *io_wq_create(unsigned bounded, struct io_wq_data *data)
err:
io_wq_put_hash(data->hash);
cpuhp_state_remove_instance_nocalls(io_wq_online, &wq->cpuhp_node);
for_each_node(node) {
if (!wq->wqes[node])
continue;
free_cpumask_var(wq->wqes[node]->cpu_mask);
kfree(wq->wqes[node]);
}
free_cpumask_var(wq->wqe.cpu_mask);
err_wq:
kfree(wq);
return ERR_PTR(ret);
@ -1247,48 +1229,36 @@ static void io_wq_cancel_tw_create(struct io_wq *wq)
static void io_wq_exit_workers(struct io_wq *wq)
{
int node;
if (!wq->task)
return;
io_wq_cancel_tw_create(wq);
rcu_read_lock();
for_each_node(node) {
struct io_wqe *wqe = wq->wqes[node];
io_wq_for_each_worker(wqe, io_wq_worker_wake, NULL);
}
io_wq_for_each_worker(&wq->wqe, io_wq_worker_wake, NULL);
rcu_read_unlock();
io_worker_ref_put(wq);
wait_for_completion(&wq->worker_done);
for_each_node(node) {
spin_lock_irq(&wq->hash->wait.lock);
list_del_init(&wq->wqes[node]->wait.entry);
spin_unlock_irq(&wq->hash->wait.lock);
}
spin_lock_irq(&wq->hash->wait.lock);
list_del_init(&wq->wqe.wait.entry);
spin_unlock_irq(&wq->hash->wait.lock);
put_task_struct(wq->task);
wq->task = NULL;
}
static void io_wq_destroy(struct io_wq *wq)
{
int node;
struct io_cb_cancel_data match = {
.fn = io_wq_work_match_all,
.cancel_all = true,
};
struct io_wqe *wqe = &wq->wqe;
cpuhp_state_remove_instance_nocalls(io_wq_online, &wq->cpuhp_node);
for_each_node(node) {
struct io_wqe *wqe = wq->wqes[node];
struct io_cb_cancel_data match = {
.fn = io_wq_work_match_all,
.cancel_all = true,
};
io_wqe_cancel_pending_work(wqe, &match);
free_cpumask_var(wqe->cpu_mask);
kfree(wqe);
}
io_wqe_cancel_pending_work(wqe, &match);
free_cpumask_var(wqe->cpu_mask);
io_wq_put_hash(wq->hash);
kfree(wq);
}
@ -1323,11 +1293,9 @@ static int __io_wq_cpu_online(struct io_wq *wq, unsigned int cpu, bool online)
.cpu = cpu,
.online = online
};
int i;
rcu_read_lock();
for_each_node(i)
io_wq_for_each_worker(wq->wqes[i], io_wq_worker_affinity, &od);
io_wq_for_each_worker(&wq->wqe, io_wq_worker_affinity, &od);
rcu_read_unlock();
return 0;
}
@ -1348,18 +1316,15 @@ static int io_wq_cpu_offline(unsigned int cpu, struct hlist_node *node)
int io_wq_cpu_affinity(struct io_wq *wq, cpumask_var_t mask)
{
int i;
struct io_wqe *wqe = &wq->wqe;
rcu_read_lock();
for_each_node(i) {
struct io_wqe *wqe = wq->wqes[i];
if (mask)
cpumask_copy(wqe->cpu_mask, mask);
else
cpumask_copy(wqe->cpu_mask, cpumask_of_node(i));
}
if (mask)
cpumask_copy(wqe->cpu_mask, mask);
else
cpumask_copy(wqe->cpu_mask, cpu_possible_mask);
rcu_read_unlock();
return 0;
}
@ -1369,9 +1334,10 @@ int io_wq_cpu_affinity(struct io_wq *wq, cpumask_var_t mask)
*/
int io_wq_max_workers(struct io_wq *wq, int *new_count)
{
struct io_wqe *wqe = &wq->wqe;
struct io_wqe_acct *acct;
int prev[IO_WQ_ACCT_NR];
bool first_node = true;
int i, node;
int i;
BUILD_BUG_ON((int) IO_WQ_ACCT_BOUND != (int) IO_WQ_BOUND);
BUILD_BUG_ON((int) IO_WQ_ACCT_UNBOUND != (int) IO_WQ_UNBOUND);
@ -1386,21 +1352,15 @@ int io_wq_max_workers(struct io_wq *wq, int *new_count)
prev[i] = 0;
rcu_read_lock();
for_each_node(node) {
struct io_wqe *wqe = wq->wqes[node];
struct io_wqe_acct *acct;
raw_spin_lock(&wqe->lock);
for (i = 0; i < IO_WQ_ACCT_NR; i++) {
acct = &wqe->acct[i];
if (first_node)
prev[i] = max_t(int, acct->max_workers, prev[i]);
if (new_count[i])
acct->max_workers = new_count[i];
}
raw_spin_unlock(&wqe->lock);
first_node = false;
raw_spin_lock(&wqe->lock);
for (i = 0; i < IO_WQ_ACCT_NR; i++) {
acct = &wqe->acct[i];
prev[i] = max_t(int, acct->max_workers, prev[i]);
if (new_count[i])
acct->max_workers = new_count[i];
}
raw_spin_unlock(&wqe->lock);
rcu_read_unlock();
for (i = 0; i < IO_WQ_ACCT_NR; i++)