linux-kernel - [PATCH 2/4] sched: make nr_iowait() return 32-bit value

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Message-Id: <20210422200228.1423391-2-adobriyan@gmail.com>
Date:   Thu, 22 Apr 2021 23:02:26 +0300
From:   Alexey Dobriyan <adobriyan@...il.com>
To:     mingo@...hat.com, peterz@...radead.org
Cc:     linux-kernel@...r.kernel.org, Alexey Dobriyan <adobriyan@...il.com>
Subject: [PATCH 2/4] sched: make nr_iowait() return 32-bit value

Creating 2**32 tasks to wait in D-state is impossible and wasteful.

Return "unsigned int" and save on REX prefixes.

Signed-off-by: Alexey Dobriyan <adobriyan@...il.com>
---
 fs/proc/stat.c             | 2 +-
 include/linux/sched/stat.h | 2 +-
 kernel/sched/core.c        | 4 ++--
 3 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/fs/proc/stat.c b/fs/proc/stat.c
index 941605de7f9a..6561a06ef905 100644
--- a/fs/proc/stat.c
+++ b/fs/proc/stat.c
@@ -201,7 +201,7 @@ static int show_stat(struct seq_file *p, void *v)
 		"btime %llu\n"
 		"processes %lu\n"
 		"procs_running %u\n"
-		"procs_blocked %lu\n",
+		"procs_blocked %u\n",
 		nr_context_switches(),
 		(unsigned long long)boottime.tv_sec,
 		total_forks,
diff --git a/include/linux/sched/stat.h b/include/linux/sched/stat.h
index f742229091ec..8a5b27ae7937 100644
--- a/include/linux/sched/stat.h
+++ b/include/linux/sched/stat.h
@@ -18,7 +18,7 @@ DECLARE_PER_CPU(unsigned long, process_counts);
 extern int nr_processes(void);
 extern unsigned int nr_running(void);
 extern bool single_task_running(void);
-extern unsigned long nr_iowait(void);
+extern unsigned int nr_iowait(void);
 extern unsigned long 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 713ea35cb995..2cc8d81cdc75 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -4413,9 +4413,9 @@ unsigned long nr_iowait_cpu(int cpu)
  * Task CPU affinities can make all that even more 'interesting'.
  */
 
-unsigned long nr_iowait(void)
+unsigned int nr_iowait(void)
 {
-	unsigned long i, sum = 0;
+	unsigned int i, sum = 0;
 
 	for_each_possible_cpu(i)
 		sum += nr_iowait_cpu(i);
-- 
2.30.2