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| author | Pavel Begunkov <asml.silence@gmail.com> | 2021-04-14 15:38:34 +0300 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2021-04-14 19:42:31 +0300 |
| commit | 7f00651aebc9af600be1d9df2a775eeeaee6bebb (patch) | |
| tree | a8348128a0b1b5fd9e9a4293c291264f06223522 /fs/io_uring.c | |
| parent | f39c8a5b1130fe17db9c66d08aa473d9587543a9 (diff) | |
| download | linux-7f00651aebc9af600be1d9df2a775eeeaee6bebb.tar.xz | |
io_uring: refactor io_ring_exit_work()
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>
Diffstat (limited to 'fs/io_uring.c')
| -rw-r--r-- | fs/io_uring.c | 9 |
1 files changed, 5 insertions, 4 deletions
diff --git a/fs/io_uring.c b/fs/io_uring.c index a807c3f22778..f0e6349f9919 100644 --- a/fs/io_uring.c +++ b/fs/io_uring.c @@ -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); |