Subject: [PATCH 09/14] tick/sched: Remove unused fields

From: Frederic Weisbecker <[email-masked]>
Date: Tue, 31 Mar 2026 15:16:17 +0200

Remove fields after the dyntick-idle cputime migration to scheduler
code.

Signed-off-by: Frederic Weisbecker <[email-masked]>
Tested-by: Shrikanth Hegde <[email-masked]>
---
 kernel/time/tick-sched.h       | 12 ------------
 kernel/time/timer_list.c       |  6 +-----
 scripts/gdb/linux/timerlist.py |  4 ----
 3 files changed, 1 insertion(+), 21 deletions(-)

diff --git a/kernel/time/tick-sched.h b/kernel/time/tick-sched.h
index b4a7822f495d..79b9252047b1 100644
--- a/kernel/time/tick-sched.h
+++ b/kernel/time/tick-sched.h
@@ -44,9 +44,7 @@ struct tick_device {
  *			to resume the tick timer operation in the timeline
  *			when the CPU returns from nohz sleep.
  * @next_tick:		Next tick to be fired when in dynticks mode.
- * @idle_jiffies:	jiffies at the entry to idle for idle time accounting
  * @idle_waketime:	Time when the idle was interrupted
- * @idle_sleeptime_seq:	sequence counter for data consistency
  * @idle_entrytime:	Time when the idle call was entered
  * @last_jiffies:	Base jiffies snapshot when next event was last computed
  * @timer_expires_base:	Base time clock monotonic for @timer_expires
@@ -55,9 +53,6 @@ struct tick_device {
  * @idle_expires:	Next tick in idle, for debugging purpose only
  * @idle_calls:		Total number of idle calls
  * @idle_sleeps:	Number of idle calls, where the sched tick was stopped
- * @idle_exittime:	Time when the idle state was left
- * @idle_sleeptime:	Sum of the time slept in idle with sched tick stopped
- * @iowait_sleeptime:	Sum of the time slept in idle with sched tick stopped, with IO outstanding
  * @tick_dep_mask:	Tick dependency mask - is set, if someone needs the tick
  * @check_clocks:	Notification mechanism about clocksource changes
  */
@@ -73,12 +68,10 @@ struct tick_sched {
 	struct hrtimer			sched_timer;
 	ktime_t				last_tick;
 	ktime_t				next_tick;
-	unsigned long			idle_jiffies;
 	ktime_t				idle_waketime;
 	unsigned int			got_idle_tick;
 
 	/* Idle entry */
-	seqcount_t			idle_sleeptime_seq;
 	ktime_t				idle_entrytime;
 
 	/* Tick stop */
@@ -90,11 +83,6 @@ struct tick_sched {
 	unsigned long			idle_calls;
 	unsigned long			idle_sleeps;
 
-	/* Idle exit */
-	ktime_t				idle_exittime;
-	ktime_t				idle_sleeptime;
-	ktime_t				iowait_sleeptime;
-
 	/* Full dynticks handling */
 	atomic_t			tick_dep_mask;
 
diff --git a/kernel/time/timer_list.c b/kernel/time/timer_list.c
index 488e47e96e93..e77b512e8597 100644
--- a/kernel/time/timer_list.c
+++ b/kernel/time/timer_list.c
@@ -154,14 +154,10 @@ static void print_cpu(struct seq_file *m, int cpu, u64 now)
 		P_flag(highres, TS_FLAG_HIGHRES);
 		P_ns(last_tick);
 		P_flag(tick_stopped, TS_FLAG_STOPPED);
-		P(idle_jiffies);
 		P(idle_calls);
 		P(idle_sleeps);
 		P_ns(idle_entrytime);
 		P_ns(idle_waketime);
-		P_ns(idle_exittime);
-		P_ns(idle_sleeptime);
-		P_ns(iowait_sleeptime);
 		P(last_jiffies);
 		P(next_timer);
 		P_ns(idle_expires);
@@ -258,7 +254,7 @@ static void timer_list_show_tickdevices_header(struct seq_file *m)
 
 static inline void timer_list_header(struct seq_file *m, u64 now)
 {
-	SEQ_printf(m, "Timer List Version: v0.10\n");
+	SEQ_printf(m, "Timer List Version: v0.11\n");
 	SEQ_printf(m, "HRTIMER_MAX_CLOCK_BASES: %d\n", HRTIMER_MAX_CLOCK_BASES);
 	SEQ_printf(m, "now at %Ld nsecs\n", (unsigned long long)now);
 	SEQ_printf(m, "\n");
diff --git a/scripts/gdb/linux/timerlist.py b/scripts/gdb/linux/timerlist.py
index ccc24d30de80..c14ce55674c9 100644
--- a/scripts/gdb/linux/timerlist.py
+++ b/scripts/gdb/linux/timerlist.py
@@ -90,14 +90,10 @@ def print_cpu(hrtimer_bases, cpu, max_clock_bases):
             text += f"  .{'nohz':15s}: {int(bool(ts['flags'] & TS_FLAG_NOHZ))}\n"
             text += f"  .{'last_tick':15s}: {ts['last_tick']}\n"
             text += f"  .{'tick_stopped':15s}: {int(bool(ts['flags'] & TS_FLAG_STOPPED))}\n"
-            text += f"  .{'idle_jiffies':15s}: {ts['idle_jiffies']}\n"
             text += f"  .{'idle_calls':15s}: {ts['idle_calls']}\n"
             text += f"  .{'idle_sleeps':15s}: {ts['idle_sleeps']}\n"
             text += f"  .{'idle_entrytime':15s}: {ts['idle_entrytime']} nsecs\n"
             text += f"  .{'idle_waketime':15s}: {ts['idle_waketime']} nsecs\n"
-            text += f"  .{'idle_exittime':15s}: {ts['idle_exittime']} nsecs\n"
-            text += f"  .{'idle_sleeptime':15s}: {ts['idle_sleeptime']} nsecs\n"
-            text += f"  .{'iowait_sleeptime':15s}: {ts['iowait_sleeptime']} nsecs\n"
             text += f"  .{'last_jiffies':15s}: {ts['last_jiffies']}\n"
             text += f"  .{'next_timer':15s}: {ts['next_timer']}\n"
             text += f"  .{'idle_expires':15s}: {ts['idle_expires']} nsecs\n"
-- 
2.53.0