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io_uring: trace task_work_run

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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 <dylany@fb.com>
Link: https://lore.kernel.org/r/20220622134028.2013417-9-dylany@fb.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Dylan Yudaken 2022-06-22 06:40:28 -07:00 committed by Jens Axboe
parent eccd880185
commit c6dd763c24
1 changed files with 14 additions and 5 deletions
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19
io_uring/io_uring.c
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@ -986,10 +986,12 @@ static void ctx_flush_and_put(struct io_ring_ctx *ctx, bool *locked)
percpu_ref_put(&ctx->refs);
}
static void handle_tw_list(struct llist_node *node,
struct io_ring_ctx **ctx, bool *locked,
struct llist_node *last)
static unsigned int handle_tw_list(struct llist_node *node,
struct io_ring_ctx **ctx, bool *locked,
struct llist_node *last)
{
unsigned int count = 0;
while (node != last) {
struct llist_node *next = node->next;
struct io_kiocb *req = container_of(node, struct io_kiocb,
@ -1006,7 +1008,10 @@ static void handle_tw_list(struct llist_node *node,
}
req->io_task_work.func(req, locked);
node = next;
count++;
}
return count;
}
/**
@ -1047,12 +1052,14 @@ 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, NULL);
handle_tw_list(node, &ctx, &uring_locked, NULL);
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);
}
@ -1061,6 +1068,8 @@ 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)