From: Alexey Dobriyan <adobriyan@gmail.com>
To: mingo@redhat.com, peterz@infradead.org
Cc: linux-kernel@vger.kernel.org
Subject: [PATCH 3/5] sched: make nr_iowait() return 32-bit value
Date: Sat, 6 Feb 2021 18:22:29 +0300 [thread overview]
Message-ID: <20210206152229.GC487103@localhost.localdomain> (raw)
In-Reply-To: <20210206151832.GA487103@localhost.localdomain>
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(-)
--- 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,
--- 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);
unsigned int nr_running(void);
extern bool single_task_running(void);
-extern unsigned long nr_iowait(void);
+unsigned int nr_iowait(void);
extern unsigned long nr_iowait_cpu(int cpu);
static inline int sched_info_on(void)
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -4418,9 +4418,9 @@ 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);
next prev parent reply other threads:[~2021-02-06 15:23 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-02-06 15:18 [PATCH 1/5] sched: make struct task_struct::state 32-bit Alexey Dobriyan
2021-02-06 15:20 ` [PATCH 2/5] sched: make nr_running() return 32-bit Alexey Dobriyan
2021-02-06 15:22 ` Alexey Dobriyan [this message]
2021-02-06 15:24 ` [PATCH 4/5] sched: make nr_iowait_cpu() " Alexey Dobriyan
2021-02-06 15:30 ` [PATCH 5/5] sched: make multiple runqueue task counters 32-bit Alexey Dobriyan
2021-02-08 10:34 ` [PATCH 1/5] sched: make struct task_struct::state 32-bit Peter Zijlstra
2021-02-08 14:30 ` Alexey Dobriyan
2021-02-08 14:52 ` Alexey Dobriyan
2021-02-08 15:25 ` Peter Zijlstra
2021-02-08 16:45 ` Alexey Dobriyan
2021-02-08 10:39 ` Peter Zijlstra
2021-02-08 14:33 ` Alexey Dobriyan
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