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From: Alexey Dobriyan <adobriyan@gmail.com>
To: mingo@redhat.com, peterz@infradead.org
Cc: linux-kernel@vger.kernel.org, Alexey Dobriyan <adobriyan@gmail.com>
Subject: [PATCH 2/4] sched: make nr_iowait() return 32-bit value
Date: Thu, 22 Apr 2021 23:02:26 +0300	[thread overview]
Message-ID: <20210422200228.1423391-2-adobriyan@gmail.com> (raw)
In-Reply-To: <20210422200228.1423391-1-adobriyan@gmail.com>

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>
---
 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


  reply	other threads:[~2021-04-22 20:02 UTC|newest]

Thread overview: 15+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-04-22 20:02 [PATCH 1/4] sched: make nr_running() return 32-bit Alexey Dobriyan
2021-04-22 20:02 ` Alexey Dobriyan [this message]
2021-05-12 20:01   ` [tip: sched/core] sched: Make nr_iowait() return 32-bit value tip-bot2 for Alexey Dobriyan
2021-04-22 20:02 ` [PATCH 3/4] sched: make nr_iowait_cpu() return 32-bit Alexey Dobriyan
2021-05-12 20:01   ` [tip: sched/core] sched: Make nr_iowait_cpu() return 32-bit value tip-bot2 for Alexey Dobriyan
2021-04-22 20:02 ` [PATCH 4/4] sched: make multiple runqueue task counters 32-bit Alexey Dobriyan
2021-05-12 19:36   ` Ingo Molnar
2021-05-12 20:01   ` [tip: sched/core] sched: Make " tip-bot2 for Alexey Dobriyan
2021-05-12 20:01 ` [tip: sched/core] sched: Make nr_running() return 32-bit value tip-bot2 for Alexey Dobriyan
2021-05-12 23:58 ` [PATCH 1/4] sched: make nr_running() return 32-bit Thomas Gleixner
2021-05-13  7:23   ` Alexey Dobriyan
2021-05-13  9:58   ` Ingo Molnar
2021-05-13 21:22     ` Alexey Dobriyan
2021-05-14 12:52     ` Thomas Gleixner
2021-05-14 18:18     ` Thomas Gleixner

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