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Code Issues Releases Wiki Activity

io_uring: refactor io_ring_exit_work()

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Don't reinit io_ring_exit_work()'s exit work/completions on each
iteration, that's wasteful. Also add list_rotate_left(), so if we failed
to complete the task job, we don't try it again and again but defer it
until others are processed.

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Pavel Begunkov 2021-04-14 13:38:34 +01:00 committed by Jens Axboe
parent f39c8a5b11
commit 7f00651aeb
1 changed files with 5 additions and 4 deletions
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9
fs/io_uring.c
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@ -8575,6 +8575,9 @@ static void io_ring_exit_work(struct work_struct *work)
WARN_ON_ONCE(time_after(jiffies, timeout));
} while (!wait_for_completion_timeout(&ctx->ref_comp, HZ/20));
init_completion(&exit.completion);
init_task_work(&exit.task_work, io_tctx_exit_cb);
exit.ctx = ctx;
/*
* Some may use context even when all refs and requests have been put,
* and they are free to do so while still holding uring_lock or
@ -8587,9 +8590,8 @@ static void io_ring_exit_work(struct work_struct *work)
node = list_first_entry(&ctx->tctx_list, struct io_tctx_node,
ctx_node);
exit.ctx = ctx;
init_completion(&exit.completion);
init_task_work(&exit.task_work, io_tctx_exit_cb);
/* don't spin on a single task if cancellation failed */
list_rotate_left(&ctx->tctx_list);
ret = task_work_add(node->task, &exit.task_work, TWA_SIGNAL);
if (WARN_ON_ONCE(ret))
continue;
@ -8597,7 +8599,6 @@ static void io_ring_exit_work(struct work_struct *work)
mutex_unlock(&ctx->uring_lock);
wait_for_completion(&exit.completion);
cond_resched();
mutex_lock(&ctx->uring_lock);
}
mutex_unlock(&ctx->uring_lock);