linux-kernel - [PATCH] sched/fair: Make hrtimer callback execute in the hard interrupt context

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Date:   Mon,  6 Mar 2023 15:09:38 +0800
From:   Zqiang <qiang1.zhang@...el.com>
To:     mingo@...hat.com, peterz@...radead.org, vincent.guittot@...aro.org,
        juri.lelli@...hat.com
Cc:     dietmar.eggemann@....com, rostedt@...dmis.org, vschneid@...hat.com,
        linux-kernel@...r.kernel.org, qiang1.zhang@...el.com
Subject: [PATCH] sched/fair: Make hrtimer callback execute in the hard interrupt context

The scheduler related hrtimers callback will be executed in softirqd
context for PREEMPT_RT enabled kernel, this commit therefore mark
hrtimers as harded even on PREEMPT_RT enabled kernels, there is no
functional change.

Signed-off-by: Zqiang <qiang1.zhang@...el.com>
---
 kernel/sched/fair.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index c36aa54ae071..98c48d144089 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -5610,7 +5610,7 @@ static void start_cfs_slack_bandwidth(struct cfs_bandwidth *cfs_b)
 
 	hrtimer_start(&cfs_b->slack_timer,
 			ns_to_ktime(cfs_bandwidth_slack_period),
-			HRTIMER_MODE_REL);
+			HRTIMER_MODE_REL_HARD);
 }
 
 /* we know any runtime found here is valid as update_curr() precedes return */
@@ -5813,9 +5813,9 @@ void init_cfs_bandwidth(struct cfs_bandwidth *cfs_b)
 	cfs_b->burst = 0;
 
 	INIT_LIST_HEAD(&cfs_b->throttled_cfs_rq);
-	hrtimer_init(&cfs_b->period_timer, CLOCK_MONOTONIC, HRTIMER_MODE_ABS_PINNED);
+	hrtimer_init(&cfs_b->period_timer, CLOCK_MONOTONIC, HRTIMER_MODE_ABS_PINNED_HARD);
 	cfs_b->period_timer.function = sched_cfs_period_timer;
-	hrtimer_init(&cfs_b->slack_timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
+	hrtimer_init(&cfs_b->slack_timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL_HARD);
 	cfs_b->slack_timer.function = sched_cfs_slack_timer;
 	cfs_b->slack_started = false;
 }
@@ -5835,7 +5835,7 @@ void start_cfs_bandwidth(struct cfs_bandwidth *cfs_b)
 
 	cfs_b->period_active = 1;
 	hrtimer_forward_now(&cfs_b->period_timer, cfs_b->period);
-	hrtimer_start_expires(&cfs_b->period_timer, HRTIMER_MODE_ABS_PINNED);
+	hrtimer_start_expires(&cfs_b->period_timer, HRTIMER_MODE_ABS_PINNED_HARD);
 }
 
 static void destroy_cfs_bandwidth(struct cfs_bandwidth *cfs_b)
-- 
2.25.1