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@gmail.com>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Link: https://lore.kernel.org/r/20210422200228.1423391-2-adobriyan@gmail.com

diff --git a/fs/proc/stat.c b/fs/proc/stat.c
index 941605d..6561a06 100644 (file)
--- 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 73606b3..81d9b53 100644 (file)
--- a/include/linux/sched/stat.h
+++ b/include/linux/sched/stat.h
@@ -19,7 +19,7 @@ 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 2c6cdb0..fadf2bf 100644 (file)
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -4774,9 +4774,9 @@ 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);