linux-kernel - [RFC PATCH 04/23] sched/core: Add user_tick as argument to scheduler

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Date:   Fri,  9 Sep 2022 16:11:46 -0700
From:   Ricardo Neri <ricardo.neri-calderon@...ux.intel.com>
To:     "Peter Zijlstra (Intel)" <peterz@...radead.org>,
        Juri Lelli <juri.lelli@...hat.com>,
        Vincent Guittot <vincent.guittot@...aro.org>
Cc:     Ricardo Neri <ricardo.neri@...el.com>,
        "Ravi V. Shankar" <ravi.v.shankar@...el.com>,
        Ben Segall <bsegall@...gle.com>,
        Daniel Bristot de Oliveira <bristot@...hat.com>,
        Dietmar Eggemann <dietmar.eggemann@....com>,
        Len Brown <len.brown@...el.com>, Mel Gorman <mgorman@...e.de>,
        "Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
        Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Tim Chen <tim.c.chen@...ux.intel.com>,
        Valentin Schneider <vschneid@...hat.com>, x86@...nel.org,
        linux-kernel@...r.kernel.org,
        Ricardo Neri <ricardo.neri-calderon@...ux.intel.com>,
        "Tim C . Chen" <tim.c.chen@...el.com>
Subject: [RFC PATCH 04/23] sched/core: Add user_tick as argument to scheduler_tick()

Differentiate between user and kernel ticks so that the scheduler updates
the class of the current task during the latter.

Cc: Ben Segall <bsegall@...gle.com>
Cc: Daniel Bristot de Oliveira <bristot@...hat.com>
Cc: Dietmar Eggemann <dietmar.eggemann@....com>
Cc: Len Brown <len.brown@...el.com>
Cc: Mel Gorman <mgorman@...e.de>
Cc: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
Cc: Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>
Cc: Steven Rostedt <rostedt@...dmis.org>
Cc: Tim C. Chen <tim.c.chen@...el.com>
Cc: Valentin Schneider <vschneid@...hat.com>
Cc: x86@...nel.org
Cc: linux-kernel@...r.kernel.org
Signed-off-by: Ricardo Neri <ricardo.neri-calderon@...ux.intel.com>
---
 include/linux/sched.h | 2 +-
 kernel/sched/core.c   | 2 +-
 kernel/time/timer.c   | 2 +-
 3 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/include/linux/sched.h b/include/linux/sched.h
index acc33dbaa47c..73f9e745d17d 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -283,7 +283,7 @@ enum {
 	TASK_COMM_LEN = 16,
 };
 
-extern void scheduler_tick(void);
+extern void scheduler_tick(bool user_tick);
 
 #define	MAX_SCHEDULE_TIMEOUT		LONG_MAX
 
diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index db548c1a25ef..76015dbc45c5 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -5436,7 +5436,7 @@ static inline u64 cpu_resched_latency(struct rq *rq) { return 0; }
  * This function gets called by the timer code, with HZ frequency.
  * We call it with interrupts disabled.
  */
-void scheduler_tick(void)
+void scheduler_tick(bool user_tick)
 {
 	int cpu = smp_processor_id();
 	struct rq *rq = cpu_rq(cpu);
diff --git a/kernel/time/timer.c b/kernel/time/timer.c
index 717fcb9fb14a..b444b6f5f585 100644
--- a/kernel/time/timer.c
+++ b/kernel/time/timer.c
@@ -1841,7 +1841,7 @@ void update_process_times(int user_tick)
 	if (in_irq())
 		irq_work_tick();
 #endif
-	scheduler_tick();
+	scheduler_tick(user_tick);
 	if (IS_ENABLED(CONFIG_POSIX_TIMERS))
 		run_posix_cpu_timers();
 }
-- 
2.25.1