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| author | Pavel Begunkov <asml.silence@gmail.com> | 2021-08-09 13:04:17 +0100 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2021-08-23 13:07:59 -0600 |
| commit | 58d3be2c60d2cf4e6bb65bb6200fa39a7bc477f9 (patch) | |
| tree | 56db10d69c2172010bcd2ee721b35df44f0f4b68 /fs/io_uring.c | |
| parent | d3fddf6dddd84432161eb070ed8e34d14c8bf56a (diff) | |
| download | lwn-58d3be2c60d2cf4e6bb65bb6200fa39a7bc477f9.tar.gz lwn-58d3be2c60d2cf4e6bb65bb6200fa39a7bc477f9.zip | |
io_uring: improve ctx hang handling
If io_ring_exit_work() can't get it done in 5 minutes, something is
going very wrong, don't keep spinning at HZ / 20 rate, it doesn't help
and it may take much of CPU time if there is a lot of workers stuck as
such.
Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/9e2d1ca81d569f6bc628af1a42ff6663bff7ce9c.1628471125.git.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 | 8 |
1 files changed, 6 insertions, 2 deletions
diff --git a/fs/io_uring.c b/fs/io_uring.c index 26a3ab9b6aed..af9472e3f17b 100644 --- a/fs/io_uring.c +++ b/fs/io_uring.c @@ -8795,6 +8795,7 @@ static void io_ring_exit_work(struct work_struct *work) { struct io_ring_ctx *ctx = container_of(work, struct io_ring_ctx, exit_work); unsigned long timeout = jiffies + HZ * 60 * 5; + unsigned long interval = HZ / 20; struct io_tctx_exit exit; struct io_tctx_node *node; int ret; @@ -8819,8 +8820,11 @@ static void io_ring_exit_work(struct work_struct *work) io_sq_thread_unpark(sqd); } - WARN_ON_ONCE(time_after(jiffies, timeout)); - } while (!wait_for_completion_timeout(&ctx->ref_comp, HZ/20)); + if (WARN_ON_ONCE(time_after(jiffies, timeout))) { + /* there is little hope left, don't run it too often */ + interval = HZ * 60; + } + } while (!wait_for_completion_timeout(&ctx->ref_comp, interval)); init_completion(&exit.completion); init_task_work(&exit.task_work, io_tctx_exit_cb); |