ime;
+				sq_work_time = sq->work_time;
+			}
 		} else {
 			rcu_read_unlock();
 		}
@@ -168,8 +171,10 @@ static void __io_uring_show_fdinfo(struct io_ring_ctx *ctx, struct seq_file *m)
 
 	seq_printf(m, "SqThread:\t%d\n", sq_pid);
 	seq_printf(m, "SqThreadCpu:\t%d\n", sq_cpu);
-	seq_printf(m, "SqTotalTime:\t%llu\n", sq_total_time);
-	seq_printf(m, "SqWorkTime:\t%llu\n", sq_work_time);
+	if (!(ctx->flags & IORING_SETUP_NO_SQTHREAD_STATS)) {
+		seq_printf(m, "SqTotalTime:\t%llu\n", sq_total_time);
+		seq_printf(m, "SqWorkTime:\t%llu\n", sq_work_time);
+	}
 	seq_printf(m, "UserFiles:\t%u\n", ctx->file_table.data.nr);
 	for (i = 0; i < ctx->file_table.data.nr; i++) {
 		struct file *f = NULL;
diff --git a/io_uring/io_uring.h b/io_uring/io_uring.h
index 46d9141d772a..f3e72b447fca 100644
--- a/io_uring/io_uring.h
+++ b/io_uring/io_uring.h
@@ -54,7 +54,8 @@
 			IORING_SETUP_REGISTERED_FD_ONLY |\
 			IORING_SETUP_NO_SQARRAY |\
 			IORING_SETUP_HYBRID_IOPOLL |\
-			IORING_SETUP_CQE_MIXED)
+			IORING_SETUP_CQE_MIXED |\
+			IORING_SETUP_NO_SQTHREAD_STATS)
 
 #define IORING_ENTER_FLAGS (IORING_ENTER_GETEVENTS |\
 			IORING_ENTER_SQ_WAKEUP |\
diff --git a/io_uring/sqpoll.c b/io_uring/sqpoll.c
index a3f11349ce06..4169dd02833b 100644
--- a/io_uring/sqpoll.c
+++ b/io_uring/sqpoll.c
@@ -161,6 +161,7 @@ static struct io_sq_data *io_get_sq_data(struct io_uring_params *p,
 	mutex_init(&sqd->lock);
 	init_waitqueue_head(&sqd->wait);
 	init_completion(&sqd->exited);
+	sqd->enable_work_time_stat = true;
 	return sqd;
 }
 
@@ -317,7 +318,8 @@ static int io_sq_thread(void *data)
 		}
 
 		cap_entries = !list_is_singular(&sqd->ctx_list);
-		getrusage(current, RUSAGE_SELF, &start);
+		if (sqd->enable_work_time_stat)
+			getrusage(current, RUSAGE_SELF, &start);
 		list_for_each_entry(ctx, &sqd->ctx_list, sqd_list) {
 			int ret = __io_sq_thread(ctx, cap_entries);
 
@@ -333,7 +335,8 @@ static int io_sq_thread(void *data)
 
 		if (sqt_spin || !time_after(jiffies, timeout)) {
 			if (sqt_spin) {
-				io_sq_update_worktime(sqd, &start);
+				if (sqd->enable_work_time_stat)
+					io_sq_update_worktime(sqd, &start);
 				timeout = jiffies + sqd->sq_thread_idle;
 			}
 			if (unlikely(need_resched())) {
@@ -445,7 +448,8 @@ __cold int io_sq_offload_create(struct io_ring_ctx *ctx,
 			ret = PTR_ERR(sqd);
 			goto err;
 		}
-
+		if (ctx->flags & IORING_SETUP_NO_SQTHREAD_STATS)
+			sqd->enable_work_time_stat = false;
 		ctx->sq_creds = get_current_cred();
 		ctx->sq_data = sqd;
 		ctx->sq_thread_idle = msecs_to_jiffies(p->sq_thread_idle);
diff --git a/io_uring/sqpoll.h b/io_uring/sqpoll.h
index b83dcdec9765..55f2e4d46d54 100644
--- a/io_uring/sqpoll.h
+++ b/io_uring/sqpoll.h
@@ -19,6 +19,7 @@ struct io_sq_data {
 	u64			work_time;
 	unsigned long		state;
 	struct completion	exited;
+	bool			enable_work_time_stat;
 };
 
 int io_sq_offload_create(struct io_ring_ctx *ctx, struct io_uring_params *p);
-- 
2.20.1[PATCH] io_uring: add IORING_SETUP_NO_SQTHREAD_STATS flag to disable sqthread stats collectionFengnan Chang <changfengnan@bytedance.com> undefinedaxboe@kernel.dk, xiaobing.li@samsung.com, io-uring@vger.kernel.org undefined undefined undefined undefined†wƒž