linux-kernel - [tip: sched/core] sched: Make nr_iowait

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Date:   Wed, 12 May 2021 20:01:46 -0000
From:   "tip-bot2 for Alexey Dobriyan" <tip-bot2@...utronix.de>
To:     linux-tip-commits@...r.kernel.org
Cc:     Alexey Dobriyan <adobriyan@...il.com>,
        Ingo Molnar <mingo@...nel.org>, x86@...nel.org,
        linux-kernel@...r.kernel.org
Subject: [tip: sched/core] sched: Make nr_iowait_cpu() return 32-bit value

The following commit has been merged into the sched/core branch of tip:

Commit-ID:     8fc2858e572ce761bffcade81a42ac72005e76f9
Gitweb:        https://git.kernel.org/tip/8fc2858e572ce761bffcade81a42ac72005e76f9
Author:        Alexey Dobriyan <adobriyan@...il.com>
AuthorDate:    Thu, 22 Apr 2021 23:02:27 +03:00
Committer:     Ingo Molnar <mingo@...nel.org>
CommitterDate: Wed, 12 May 2021 21:34:16 +02:00

sched: Make nr_iowait_cpu() return 32-bit value

Runqueue ->nr_iowait counters are 32-bit anyway.

Propagate 32-bitness into other code, but don't try too hard.

Signed-off-by: Alexey Dobriyan <adobriyan@...il.com>
Signed-off-by: Ingo Molnar <mingo@...nel.org>
Link: https://lore.kernel.org/r/20210422200228.1423391-3-adobriyan@gmail.com
---
 drivers/cpuidle/governors/menu.c | 6 +++---
 include/linux/sched/stat.h       | 2 +-
 kernel/sched/core.c              | 2 +-
 3 files changed, 5 insertions(+), 5 deletions(-)

diff --git a/drivers/cpuidle/governors/menu.c b/drivers/cpuidle/governors/menu.c
index c3aa8d6..2e56704 100644
--- a/drivers/cpuidle/governors/menu.c
+++ b/drivers/cpuidle/governors/menu.c
@@ -117,7 +117,7 @@ struct menu_device {
 	int		interval_ptr;
 };
 
-static inline int which_bucket(u64 duration_ns, unsigned long nr_iowaiters)
+static inline int which_bucket(u64 duration_ns, unsigned int nr_iowaiters)
 {
 	int bucket = 0;
 
@@ -150,7 +150,7 @@ static inline int which_bucket(u64 duration_ns, unsigned long nr_iowaiters)
  * to be, the higher this multiplier, and thus the higher
  * the barrier to go to an expensive C state.
  */
-static inline int performance_multiplier(unsigned long nr_iowaiters)
+static inline int performance_multiplier(unsigned int nr_iowaiters)
 {
 	/* for IO wait tasks (per cpu!) we add 10x each */
 	return 1 + 10 * nr_iowaiters;
@@ -270,7 +270,7 @@ static int menu_select(struct cpuidle_driver *drv, struct cpuidle_device *dev,
 	unsigned int predicted_us;
 	u64 predicted_ns;
 	u64 interactivity_req;
-	unsigned long nr_iowaiters;
+	unsigned int nr_iowaiters;
 	ktime_t delta, delta_tick;
 	int i, idx;
 
diff --git a/include/linux/sched/stat.h b/include/linux/sched/stat.h
index 81d9b53..0108a38 100644
--- a/include/linux/sched/stat.h
+++ b/include/linux/sched/stat.h
@@ -20,7 +20,7 @@ extern int nr_processes(void);
 extern unsigned int nr_running(void);
 extern bool single_task_running(void);
 extern unsigned int nr_iowait(void);
-extern unsigned long nr_iowait_cpu(int cpu);
+extern unsigned int nr_iowait_cpu(int cpu);
 
 static inline int sched_info_on(void)
 {
diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index fadf2bf..24fd795 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -4739,7 +4739,7 @@ unsigned long long nr_context_switches(void)
  * it does become runnable.
  */
 
-unsigned long nr_iowait_cpu(int cpu)
+unsigned int nr_iowait_cpu(int cpu)
 {
 	return atomic_read(&cpu_rq(cpu)->nr_iowait);
 }