public inbox for [email protected]
 help / color / mirror / Atom feed
From: Dylan Yudaken <[email protected]>
To: <[email protected]>, <[email protected]>, <[email protected]>
Cc: <[email protected]>, Dylan Yudaken <[email protected]>
Subject: [PATCH RFC for-next 8/8] io_uring: trace task_work_run
Date: Mon, 20 Jun 2022 09:19:01 -0700	[thread overview]
Message-ID: <[email protected]> (raw)
In-Reply-To: <[email protected]>

trace task_work_run to help provide stats on how often task work is run
and what batch sizes are coming through.

Signed-off-by: Dylan Yudaken <[email protected]>
---
 io_uring/io_uring.c | 16 +++++++++++-----
 1 file changed, 11 insertions(+), 5 deletions(-)

diff --git a/io_uring/io_uring.c b/io_uring/io_uring.c
index 0b4d3eb06d16..8cf868315008 100644
--- a/io_uring/io_uring.c
+++ b/io_uring/io_uring.c
@@ -987,10 +987,12 @@ static void ctx_flush_and_put(struct io_ring_ctx *ctx, bool *locked)
 }
 
 
-static void handle_tw_list(struct llist_node *node,
-			   struct io_ring_ctx **ctx, bool *locked,
-			   struct llist_node *fake)
+static unsigned int handle_tw_list(struct llist_node *node,
+				   struct io_ring_ctx **ctx, bool *locked,
+				   struct llist_node *fake)
 {
+	unsigned int count = 0;
+
 	while (node && node != fake) {
 		struct llist_node *next = node->next;
 		struct io_kiocb *req = container_of(node, struct io_kiocb,
@@ -1051,12 +1053,14 @@ void tctx_task_work(struct callback_head *cb)
 						  task_work);
 	struct llist_node fake = {};
 	struct llist_node *node = io_llist_xchg(&tctx->task_list, &fake);
+	unsigned int loops = 1;
+	unsigned int count = handle_tw_list(node, &ctx, &uring_locked, &fake);
 
-	handle_tw_list(node, &ctx, &uring_locked, &fake);
 	node = io_llist_cmpxchg(&tctx->task_list, &fake, NULL);
 	while (node != &fake) {
+		loops++;
 		node = io_llist_xchg(&tctx->task_list, &fake);
-		handle_tw_list(node, &ctx, &uring_locked, &fake);
+		count += handle_tw_list(node, &ctx, &uring_locked, &fake);
 		node = io_llist_cmpxchg(&tctx->task_list, &fake, NULL);
 	}
 
@@ -1065,6 +1069,8 @@ void tctx_task_work(struct callback_head *cb)
 	/* relaxed read is enough as only the task itself sets ->in_idle */
 	if (unlikely(atomic_read(&tctx->in_idle)))
 		io_uring_drop_tctx_refs(current);
+
+	trace_io_uring_task_work_run(tctx, count, loops);
 }
 
 void io_req_task_work_add(struct io_kiocb *req)
-- 
2.30.2


  parent reply	other threads:[~2022-06-20 16:19 UTC|newest]

Thread overview: 20+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-06-20 16:18 [PATCH RFC for-next 0/8] io_uring: tw contention improvments Dylan Yudaken
2022-06-20 16:18 ` [PATCH RFC for-next 1/8] io_uring: remove priority tw list optimisation Dylan Yudaken
2022-06-20 16:18 ` [PATCH RFC for-next 2/8] io_uring: remove __io_req_task_work_add Dylan Yudaken
2022-06-20 16:18 ` [PATCH RFC for-next 3/8] io_uring: lockless task list Dylan Yudaken
2022-06-20 16:18 ` [PATCH RFC for-next 4/8] io_uring: introduce llist helpers Dylan Yudaken
2022-06-20 16:18 ` [PATCH RFC for-next 5/8] io_uring: batch task_work Dylan Yudaken
2022-06-20 16:18 ` [PATCH RFC for-next 6/8] io_uring: move io_uring_get_opcode out of TP_printk Dylan Yudaken
2022-06-20 16:19 ` [PATCH RFC for-next 7/8] io_uring: add trace event for running task work Dylan Yudaken
2022-06-20 16:19 ` Dylan Yudaken [this message]
2022-06-21  5:10 ` [PATCH RFC for-next 0/8] io_uring: tw contention improvments Hao Xu
2022-06-21  7:03   ` Dylan Yudaken
2022-06-21  7:34     ` Hao Xu
2022-06-22  9:31       ` Dylan Yudaken
2022-06-22 11:16         ` Hao Xu
2022-06-22 11:24           ` Hao Xu
2022-06-22 11:51             ` Dylan Yudaken
2022-06-22 12:28               ` Hao Xu
2022-06-22 12:29                 ` Hao Xu
2022-06-22 11:52             ` Hao Xu
2022-06-21  7:38     ` Hao Xu

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    [email protected] \
    [email protected] \
    [email protected] \
    [email protected] \
    [email protected] \
    [email protected] \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox