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io-wq: use private CPU mask

Browse source 
In preparation for allowing user specific CPU masks for IO thread
creation, switch to using a mask embedded in the per-node wqe
structure.

Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Jens Axboe 2021-06-17 10:08:11 -06:00
parent ec16d35b6c
commit 0e03496d19
1 changed files with 46 additions and 10 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

56
fs/io-wq.c
View file

@ -94,6 +94,8 @@ struct io_wqe {
struct io_wq *wq;
struct io_wq_work *hash_tail[IO_WQ_NR_HASH_BUCKETS];
cpumask_var_t cpu_mask;
};
/*
@ -638,7 +640,7 @@ static void create_io_worker(struct io_wq *wq, struct io_wqe *wqe, int index)
tsk->pf_io_worker = worker;
worker->task = tsk;
set_cpus_allowed_ptr(tsk, cpumask_of_node(wqe->node));
set_cpus_allowed_ptr(tsk, wqe->cpu_mask);
tsk->flags |= PF_NO_SETAFFINITY;
raw_spin_lock_irq(&wqe->lock);
@ -922,6 +924,9 @@ struct io_wq *io_wq_create(unsigned bounded, struct io_wq_data *data)
wqe = kzalloc_node(sizeof(struct io_wqe), GFP_KERNEL, alloc_node);
if (!wqe)
goto err;
if (!alloc_cpumask_var(&wqe->cpu_mask, GFP_KERNEL))
goto err;
cpumask_copy(wqe->cpu_mask, cpumask_of_node(node));
wq->wqes[node] = wqe;
wqe->node = alloc_node;
wqe->acct[IO_WQ_ACCT_BOUND].index = IO_WQ_ACCT_BOUND;
@ -947,8 +952,12 @@ 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)
for_each_node(node) {
if (!wq->wqes[node])
continue;
free_cpumask_var(wq->wqes[node]->cpu_mask);
kfree(wq->wqes[node]);
}
err_wq:
kfree(wq);
return ERR_PTR(ret);
@ -1018,6 +1027,7 @@ static void io_wq_destroy(struct io_wq *wq)
.cancel_all = true,
};
io_wqe_cancel_pending_work(wqe, &match);
free_cpumask_var(wqe->cpu_mask);
kfree(wqe);
}
io_wq_put_hash(wq->hash);
@ -1032,23 +1042,49 @@ void io_wq_put_and_exit(struct io_wq *wq)
io_wq_destroy(wq);
}
struct online_data {
unsigned int cpu;
bool online;
};
static bool io_wq_worker_affinity(struct io_worker *worker, void *data)
{
set_cpus_allowed_ptr(worker->task, cpumask_of_node(worker->wqe->node));
struct online_data *od = data;
if (od->online)
cpumask_set_cpu(od->cpu, worker->wqe->cpu_mask);
else
cpumask_clear_cpu(od->cpu, worker->wqe->cpu_mask);
return false;
}
static int __io_wq_cpu_online(struct io_wq *wq, unsigned int cpu, bool online)
{
struct online_data od = {
.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);
rcu_read_unlock();
return 0;
}
static int io_wq_cpu_online(unsigned int cpu, struct hlist_node *node)
{
struct io_wq *wq = hlist_entry_safe(node, struct io_wq, cpuhp_node);
int i;
rcu_read_lock();
for_each_node(i)
io_wq_for_each_worker(wq->wqes[i], io_wq_worker_affinity, NULL);
rcu_read_unlock();
return 0;
return __io_wq_cpu_online(wq, cpu, true);
}
static int io_wq_cpu_offline(unsigned int cpu, struct hlist_node *node)
{
struct io_wq *wq = hlist_entry_safe(node, struct io_wq, cpuhp_node);
return __io_wq_cpu_online(wq, cpu, false);
}
static __init int io_wq_init(void)
@ -1056,7 +1092,7 @@ static __init int io_wq_init(void)
int ret;
ret = cpuhp_setup_state_multi(CPUHP_AP_ONLINE_DYN, "io-wq/online",
io_wq_cpu_online, NULL);
io_wq_cpu_online, io_wq_cpu_offline);
if (ret < 0)
return ret;
io_wq_online = ret;