From: Pavel Begunkov <[email protected]>
To: Jens Axboe <[email protected]>, [email protected]
Subject: [PATCH 12/23] io_uring: improve ctx hang handling
Date: Thu, 29 Jul 2021 16:05:39 +0100 [thread overview]
Message-ID: <2d9c504aa9ec1a3cad16e58b08403a781ae49468.1627570633.git.asml.silence@gmail.com> (raw)
In-Reply-To: <[email protected]>
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 <[email protected]>
---
fs/io_uring.c | 8 ++++++--
1 file changed, 6 insertions(+), 2 deletions(-)
diff --git a/fs/io_uring.c b/fs/io_uring.c
index 2ee5ba115cfc..ce56b2952042 100644
--- a/fs/io_uring.c
+++ b/fs/io_uring.c
@@ -8789,6 +8789,7 @@ 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;
@@ -8813,8 +8814,11 @@ 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);
--
2.32.0
next prev parent reply other threads:[~2021-07-29 15:06 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-07-29 15:05 [PATCH for-next 00/23] first 5.15 batch Pavel Begunkov
2021-07-29 15:05 ` [PATCH 01/23] io_uring: remove unnecessary PF_EXITING check Pavel Begunkov
2021-07-29 15:05 ` [PATCH 02/23] io-wq: improve wq_list_add_tail() Pavel Begunkov
2021-07-29 15:05 ` [PATCH 03/23] io_uring: refactor io_alloc_req Pavel Begunkov
2021-07-29 15:05 ` [PATCH 04/23] io_uring: don't halt iopoll too early Pavel Begunkov
2021-07-29 15:05 ` [PATCH 05/23] io_uring: add more locking annotations for submit Pavel Begunkov
2021-07-29 15:05 ` [PATCH 06/23] io_uring: optimise io_cqring_wait() hot path Pavel Begunkov
2021-07-29 15:05 ` [PATCH 07/23] io_uring: extract a helper for ctx quiesce Pavel Begunkov
2021-07-29 15:05 ` [PATCH 08/23] io_uring: move io_put_task() definition Pavel Begunkov
2021-07-29 15:05 ` [PATCH 09/23] io_uring: move io_rsrc_node_alloc() definition Pavel Begunkov
2021-07-29 15:05 ` [PATCH 10/23] io_uring: inline io_free_req_deferred Pavel Begunkov
2021-07-29 15:05 ` [PATCH 11/23] io_uring: deduplicate open iopoll check Pavel Begunkov
2021-07-29 15:05 ` Pavel Begunkov [this message]
2021-07-29 15:05 ` [PATCH 13/23] io_uring: kill unused IO_IOPOLL_BATCH Pavel Begunkov
2021-07-29 15:05 ` [PATCH 14/23] io_uring: drop exec checks from io_req_task_submit Pavel Begunkov
2021-07-29 15:05 ` [PATCH 15/23] io_uring: optimise putting task struct Pavel Begunkov
2021-07-29 15:05 ` [PATCH 16/23] io_uring: hide async dadta behind flags Pavel Begunkov
2021-07-29 15:05 ` [PATCH 17/23] io_uring: move io_fallback_req_func() Pavel Begunkov
2021-07-29 15:05 ` [PATCH 18/23] io_uring: cache __io_free_req()'d requests Pavel Begunkov
2021-07-29 15:05 ` [PATCH 19/23] io_uring: use inflight_entry instead of compl.list Pavel Begunkov
2021-07-29 15:05 ` [PATCH 20/23] io_uring: remove redundant args from cache_free Pavel Begunkov
2021-07-29 15:05 ` [PATCH 21/23] io_uring: inline struct io_comp_state Pavel Begunkov
2021-07-29 15:05 ` [PATCH 22/23] io_uring: remove extra argument for overflow flush Pavel Begunkov
2021-07-29 15:05 ` [PATCH 23/23] io_uring: inline io_poll_remove_waitqs Pavel Begunkov
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