linux-kernel - Re: [PATCH v8] io_uring: Statistics of the true utilization of sq threads.

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Date: Sun, 18 Feb 2024 13:55:13 +0800
From: Xiaobing Li <xiaobing.li@...sung.com>
To: xiaobing.li@...sung.com
Cc: axboe@...nel.dk, asml.silence@...il.com, linux-kernel@...r.kernel.org,
	io-uring@...r.kernel.org, kun.dou@...sung.com, peiwei.li@...sung.com,
	joshi.k@...sung.com, kundan.kumar@...sung.com, wenwen.chen@...sung.com,
	ruyi.zhang@...sung.com
Subject: Re: [PATCH v8] io_uring: Statistics of the true utilization of sq
 threads.

On 2/6/24 10:39 AM, Xiaobing Li wrote:
> io_uring/fdinfo.c | 8 ++++++++
> io_uring/sqpoll.c | 8 ++++++++
> io_uring/sqpoll.h | 1 +
> 3 files changed, 17 insertions(+)
>
>diff --git a/io_uring/fdinfo.c b/io_uring/fdinfo.c
>index 976e9500f651..18c6f4aa4a48 100644
>--- a/io_uring/fdinfo.c
>+++ b/io_uring/fdinfo.c
>@@ -64,6 +64,7 @@ __cold void io_uring_show_fdinfo(struct seq_file *m, struct file *f)
> 	unsigned int sq_shift = 0;
> 	unsigned int sq_entries, cq_entries;
> 	int sq_pid = -1, sq_cpu = -1;
>+	u64 sq_total_time = 0, sq_work_time = 0;
> 	bool has_lock;
> 	unsigned int i;
> 
>@@ -147,10 +148,17 @@ __cold void io_uring_show_fdinfo(struct seq_file *m, struct file *f)
> 
> 		sq_pid = sq->task_pid;
> 		sq_cpu = sq->sq_cpu;
>+		struct rusage r;
>+
>+		getrusage(sq->thread, RUSAGE_SELF, &r);
>+		sq_total_time = r.ru_stime.tv_sec * 1000000 + r.ru_stime.tv_usec;
>+		sq_work_time = sq->work_time;
> 	}
> 
> 	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);
> 	seq_printf(m, "UserFiles:\t%u\n", ctx->nr_user_files);
> 	for (i = 0; has_lock && i < ctx->nr_user_files; i++) {
> 		struct file *f = io_file_from_index(&ctx->file_table, i);
>diff --git a/io_uring/sqpoll.c b/io_uring/sqpoll.c
>index 65b5dbe3c850..9155fc0b5eee 100644
>--- a/io_uring/sqpoll.c
>+++ b/io_uring/sqpoll.c
>@@ -251,6 +251,9 @@ static int io_sq_thread(void *data)
> 		}
> 
> 		cap_entries = !list_is_singular(&sqd->ctx_list);
>+		struct rusage start, end;
>+
>+		getrusage(current, RUSAGE_SELF, &start);
> 		list_for_each_entry(ctx, &sqd->ctx_list, sqd_list) {
> 			int ret = __io_sq_thread(ctx, cap_entries);
> 
>@@ -260,6 +263,11 @@ static int io_sq_thread(void *data)
> 		if (io_run_task_work())
> 			sqt_spin = true;
> 
>+		getrusage(current, RUSAGE_SELF, &end);
>+		if (sqt_spin == true)
>+			sqd->work_time += (end.ru_stime.tv_sec - start.ru_stime.tv_sec) *
>+					1000000 + (end.ru_stime.tv_usec - start.ru_stime.tv_usec);
>+
> 		if (sqt_spin || !time_after(jiffies, timeout)) {
> 			if (sqt_spin)
> 				timeout = jiffies + sqd->sq_thread_idle;
>diff --git a/io_uring/sqpoll.h b/io_uring/sqpoll.h
>index 8df37e8c9149..e99f5423a3c3 100644
>--- a/io_uring/sqpoll.h
>+++ b/io_uring/sqpoll.h
>@@ -16,6 +16,7 @@ struct io_sq_data {
> 	pid_t			task_pid;
> 	pid_t			task_tgid;
> 
>+	u64					work_time;
> 	unsigned long		state;
> 	struct completion	exited;
> };
 
Hi, Jens and Pavel
This patch has been modified according to your previous opinions.
Do you have any other comments?

--
Xiaobing Li