linux-kernel - [PATCH] sched: core: Fix comment regarding nr_iowait_cpu() and get_iowait

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Date:   Thu, 04 Oct 2018 11:05:14 +0200
From:   "Rafael J. Wysocki" <rjw@...ysocki.net>
To:     Ingo Molnar <mingo@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>
Cc:     Linux PM <linux-pm@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>, Tejun Heo <tj@...nel.org>
Subject: [PATCH] sched: core: Fix comment regarding nr_iowait_cpu() and get_iowait_load()

From: Rafael J. Wysocki <rafael.j.wysocki@...el.com>

The comment related to nr_iowait_cpu() and get_iowait_load() confuses
cpufreq with cpuidle and is not very useful for this reason, so fix it.

Fixes: e33a9bba85a8 "sched/core: move IO scheduling accounting from io_schedule_timeout() into scheduler"
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
---
 kernel/sched/core.c |    8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

Index: linux-pm/kernel/sched/core.c
===================================================================
--- linux-pm.orig/kernel/sched/core.c
+++ linux-pm/kernel/sched/core.c
@@ -2915,10 +2915,10 @@ unsigned long nr_iowait(void)
 }
 
 /*
- * Consumers of these two interfaces, like for example the cpufreq menu
- * governor are using nonsensical data. Boosting frequency for a CPU that has
- * IO-wait which might not even end up running the task when it does become
- * runnable.
+ * Consumers of these two interfaces, like for example the cpuidle menu
+ * governor, are using nonsensical data. Preferring shallow idle state selection
+ * for a CPU that has IO-wait which might not even end up running the task when
+ * it does become runnable.
  */
 
 unsigned long nr_iowait_cpu(int cpu)