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io_uring: improve task exit timeout cancellations

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Don't spin trying to cancel timeouts that are reachable but not
cancellable, e.g. already executing.

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/ab8a7440a60bbdf69ae514f672ad050e43dd1b03.1655684496.git.asml.silence@gmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Pavel Begunkov 2022-06-20 01:25:53 +01:00 committed by Jens Axboe
parent affa87db90
commit ba3cdb6fbb
1 changed files with 5 additions and 4 deletions
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9
io_uring/timeout.c
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@ -49,7 +49,7 @@ static inline void io_put_req(struct io_kiocb *req)
}
}
static void io_kill_timeout(struct io_kiocb *req, int status)
static bool io_kill_timeout(struct io_kiocb *req, int status)
__must_hold(&req->ctx->completion_lock)
__must_hold(&req->ctx->timeout_lock)
{
@ -64,7 +64,9 @@ static void io_kill_timeout(struct io_kiocb *req, int status)
atomic_read(&req->ctx->cq_timeouts) + 1);
list_del_init(&timeout->list);
io_req_tw_post_queue(req, status, 0);
return true;
}
return false;
}
__cold void io_flush_timeouts(struct io_ring_ctx *ctx)
@ -620,10 +622,9 @@ __cold bool io_kill_timeouts(struct io_ring_ctx *ctx, struct task_struct *tsk,
list_for_each_entry_safe(timeout, tmp, &ctx->timeout_list, list) {
struct io_kiocb *req = cmd_to_io_kiocb(timeout);
if (io_match_task(req, tsk, cancel_all)) {
io_kill_timeout(req, -ECANCELED);
if (io_match_task(req, tsk, cancel_all) &&
io_kill_timeout(req, -ECANCELED))
canceled++;
}
}
spin_unlock_irq(&ctx->timeout_lock);
io_commit_cqring(ctx);