linux-kernel - [PATCH 2/3] PROC FILESYSTEM: Add real utilization data of sq thread.

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Message-Id: <20230928022228.15770-3-xiaobing.li@samsung.com>
Date:   Thu, 28 Sep 2023 10:22:27 +0800
From:   Xiaobing Li <xiaobing.li@...sung.com>
To:     mingo@...hat.com, peterz@...radead.org, juri.lelli@...hat.com,
        vincent.guittot@...aro.org, dietmar.eggemann@....com,
        rostedt@...dmis.org, bsegall@...gle.com, mgorman@...e.de,
        bristot@...hat.com, vschneid@...hat.com, axboe@...nel.dk,
        asml.silence@...il.com
Cc:     linux-kernel@...r.kernel.org, linux-fsdevel@...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, Xiaobing Li <xiaobing.li@...sung.com>
Subject: [PATCH 2/3] PROC FILESYSTEM: Add real utilization data of sq
 thread.

Since it is necessary to count and record the real utilization of the sq
thread, it is recorded in the /proc/stat file.

Signed-off-by: Xiaobing Li <xiaobing.li@...sung.com>
---
 fs/proc/stat.c              | 25 ++++++++++++++++++++++++-
 include/linux/kernel_stat.h |  3 +++
 2 files changed, 27 insertions(+), 1 deletion(-)

diff --git a/fs/proc/stat.c b/fs/proc/stat.c
index da60956b2915..bd86c0657874 100644
--- a/fs/proc/stat.c
+++ b/fs/proc/stat.c
@@ -79,6 +79,29 @@ static void show_all_irqs(struct seq_file *p)
 	show_irq_gap(p, nr_irqs - next);
 }
 
+static void show_sqthread_util(struct seq_file *p)
+{
+	int i, j;
+
+	for_each_online_cpu(i) {
+		struct kernel_cpustat kcpustat;
+
+		kcpustat_cpu_fetch(&kcpustat, i);
+		struct task_struct **sqstat = kcpustat.sq_util;
+
+		for (j = 0; j < MAX_SQ_NUM; j++) {
+			if (sqstat[j]) {
+				seq_printf(p, "%d %s", sqstat[j]->pid, sqstat[j]->comm);
+				seq_put_decimal_ull(p, " pelt ",
+				(unsigned long long)sqstat[j]->se.avg.util_avg);
+				seq_put_decimal_ull(p, " real ",
+				(unsigned long long)sqstat[j]->se.sq_avg.util_avg);
+				seq_putc(p, '\n');
+			}
+		}
+	}
+}
+
 static int show_stat(struct seq_file *p, void *v)
 {
 	int i, j;
@@ -187,7 +210,7 @@ static int show_stat(struct seq_file *p, void *v)
 	for (i = 0; i < NR_SOFTIRQS; i++)
 		seq_put_decimal_ull(p, " ", per_softirq_sums[i]);
 	seq_putc(p, '\n');
-
+	show_sqthread_util(p);
 	return 0;
 }
 
diff --git a/include/linux/kernel_stat.h b/include/linux/kernel_stat.h
index 9935f7ecbfb9..722703da681e 100644
--- a/include/linux/kernel_stat.h
+++ b/include/linux/kernel_stat.h
@@ -11,6 +11,7 @@
 #include <linux/vtime.h>
 #include <asm/irq.h>
 
+#define MAX_SQ_NUM 16
 /*
  * 'kernel_stat.h' contains the definitions needed for doing
  * some kernel statistics (CPU usage, context switches ...),
@@ -36,6 +37,8 @@ enum cpu_usage_stat {
 
 struct kernel_cpustat {
 	u64 cpustat[NR_STATS];
+	bool flag;
+	struct task_struct *sq_util[MAX_SQ_NUM];
 };
 
 struct kernel_stat {
-- 
2.34.1