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io_uring: abstract out task work running 

Provide a helper to run task_work instead of checking and running
manually in a bunch of different spots. While doing so, also move the
task run state setting where we run the task work. Then we can move it
out of the callback helpers. This also helps ensure we only do this once
per task_work list run, not per task_work item.

Suggested-by: Oleg Nesterov <oleg@redhat.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Jens Axboe 2020-07-01 11:29:10 -06:00
parent 58c6a581de
commit 4c6e277c4c
1 changed files with 19 additions and 17 deletions
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36
fs/io_uring.c
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@ -1714,7 +1714,6 @@ static void __io_req_task_submit(struct io_kiocb *req)
{
struct io_ring_ctx *ctx = req->ctx;
__set_current_state(TASK_RUNNING);
if (!__io_sq_thread_acquire_mm(ctx)) {
mutex_lock(&ctx->uring_lock);
__io_queue_sqe(req, NULL, NULL);
@ -1899,6 +1898,17 @@ static int io_put_kbuf(struct io_kiocb *req)
return cflags;
}
static inline bool io_run_task_work(void)
{
if (current->task_works) {
__set_current_state(TASK_RUNNING);
task_work_run();
return true;
}
return false;
}
static void io_iopoll_queue(struct list_head *again)
{
struct io_kiocb *req;
@ -2079,8 +2089,7 @@ static int io_iopoll_check(struct io_ring_ctx *ctx, unsigned *nr_events,
*/
if (!(++iters & 7)) {
mutex_unlock(&ctx->uring_lock);
if (current->task_works)
task_work_run();
io_run_task_work();
mutex_lock(&ctx->uring_lock);
}
@ -2176,8 +2185,6 @@ static void io_rw_resubmit(struct callback_head *cb)
struct io_ring_ctx *ctx = req->ctx;
int err;
__set_current_state(TASK_RUNNING);
err = io_sq_thread_acquire_mm(ctx, req);
if (io_resubmit_prep(req, err)) {
@ -6361,8 +6368,7 @@ static int io_sq_thread(void *data)
if (!list_empty(&ctx->poll_list) || need_resched() ||
(!time_after(jiffies, timeout) && ret != -EBUSY &&
!percpu_ref_is_dying(&ctx->refs))) {
if (current->task_works)
task_work_run();
io_run_task_work();
cond_resched();
continue;
}
@ -6394,8 +6400,7 @@ static int io_sq_thread(void *data)
finish_wait(&ctx->sqo_wait, &wait);
break;
}
if (current->task_works) {
task_work_run();
if (io_run_task_work()) {
finish_wait(&ctx->sqo_wait, &wait);
continue;
}
@ -6420,8 +6425,7 @@ static int io_sq_thread(void *data)
timeout = jiffies + ctx->sq_thread_idle;
}
if (current->task_works)
task_work_run();
io_run_task_work();
io_sq_thread_drop_mm(ctx);
revert_creds(old_cred);
@ -6486,9 +6490,8 @@ static int io_cqring_wait(struct io_ring_ctx *ctx, int min_events,
do {
if (io_cqring_events(ctx, false) >= min_events)
return 0;
if (!current->task_works)
if (!io_run_task_work())
break;
task_work_run();
} while (1);
if (sig) {
@ -6510,8 +6513,8 @@ static int io_cqring_wait(struct io_ring_ctx *ctx, int min_events,
prepare_to_wait_exclusive(&ctx->wait, &iowq.wq,
TASK_INTERRUPTIBLE);
/* make sure we run task_work before checking for signals */
if (current->task_works)
task_work_run();
if (io_run_task_work())
continue;
if (signal_pending(current)) {
if (current->jobctl & JOBCTL_TASK_WORK) {
spin_lock_irq(&current->sighand->siglock);
@ -7953,8 +7956,7 @@ SYSCALL_DEFINE6(io_uring_enter, unsigned int, fd, u32, to_submit,
int submitted = 0;
struct fd f;
if (current->task_works)
task_work_run();
io_run_task_work();
if (flags & ~(IORING_ENTER_GETEVENTS | IORING_ENTER_SQ_WAKEUP))
return -EINVAL;