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timers/nohz: Restructure and reshuffle struct tick_sched

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Restructure and group fields by access in order to optimize cache
layout. While at it, also add missing kernel doc for two fields:
@last_jiffies and @idle_expires.

Reported-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Frederic Weisbecker <frederic@kernel.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lore.kernel.org/r/20230222144649.624380-2-frederic@kernel.org
This commit is contained in:
Frederic Weisbecker 2023-02-22 15:46:42 +01:00 committed by Thomas Gleixner
parent e9523a0d81
commit 605da849d5
1 changed files with 41 additions and 25 deletions
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66
kernel/time/tick-sched.h
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@ -22,65 +22,81 @@ enum tick_nohz_mode {
/**
* struct tick_sched - sched tick emulation and no idle tick control/stats
* @sched_timer: hrtimer to schedule the periodic tick in high
* resolution mode
* @check_clocks: Notification mechanism about clocksource changes
* @nohz_mode: Mode - one state of tick_nohz_mode
*
* @inidle: Indicator that the CPU is in the tick idle mode
* @tick_stopped: Indicator that the idle tick has been stopped
* @idle_active: Indicator that the CPU is actively in the tick idle mode;
* it is reset during irq handling phases.
* @do_timer_lst: CPU was the last one doing do_timer before going idle
* @do_timer_last: CPU was the last one doing do_timer before going idle
* @got_idle_tick: Tick timer function has run with @inidle set
* @stalled_jiffies: Number of stalled jiffies detected across ticks
* @last_tick_jiffies: Value of jiffies seen on last tick
* @sched_timer: hrtimer to schedule the periodic tick in high
* resolution mode
* @last_tick: Store the last tick expiry time when the tick
* timer is modified for nohz sleeps. This is necessary
* 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_entrytime: Time when the idle call was entered
* @nohz_mode: Mode - one state of tick_nohz_mode
* @last_jiffies: Base jiffies snapshot when next event was last computed
* @timer_expires_base: Base time clock monotonic for @timer_expires
* @timer_expires: Anticipated timer expiration time (in case sched tick is stopped)
* @next_timer: Expiry time of next expiring timer for debugging purpose only
* @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_entrytime: Time when the idle call was entered
* @idle_waketime: Time when the idle was interrupted
* @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
* @timer_expires: Anticipated timer expiration time (in case sched tick is stopped)
* @timer_expires_base: Base time clock monotonic for @timer_expires
* @next_timer: Expiry time of next expiring timer for debugging purpose only
* @tick_dep_mask: Tick dependency mask - is set, if someone needs the tick
* @last_tick_jiffies: Value of jiffies seen on last tick
* @stalled_jiffies: Number of stalled jiffies detected across ticks
* @check_clocks: Notification mechanism about clocksource changes
*/
struct tick_sched {
struct hrtimer sched_timer;
unsigned long check_clocks;
enum tick_nohz_mode nohz_mode;
/* Common flags */
unsigned int inidle : 1;
unsigned int tick_stopped : 1;
unsigned int idle_active : 1;
unsigned int do_timer_last : 1;
unsigned int got_idle_tick : 1;
/* Tick handling: jiffies stall check */
unsigned int stalled_jiffies;
unsigned long last_tick_jiffies;
/* Tick handling */
struct hrtimer sched_timer;
ktime_t last_tick;
ktime_t next_tick;
unsigned long idle_jiffies;
ktime_t idle_waketime;
/* Idle entry */
ktime_t idle_entrytime;
/* Tick stop */
enum tick_nohz_mode nohz_mode;
unsigned long last_jiffies;
u64 timer_expires_base;
u64 timer_expires;
u64 next_timer;
ktime_t idle_expires;
unsigned long idle_calls;
unsigned long idle_sleeps;
ktime_t idle_entrytime;
ktime_t idle_waketime;
/* Idle exit */
ktime_t idle_exittime;
ktime_t idle_sleeptime;
ktime_t iowait_sleeptime;
unsigned long last_jiffies;
u64 timer_expires;
u64 timer_expires_base;
u64 next_timer;
ktime_t idle_expires;
/* Full dynticks handling */
atomic_t tick_dep_mask;
unsigned long last_tick_jiffies;
unsigned int stalled_jiffies;
/* Clocksource changes */
unsigned long check_clocks;
};
extern struct tick_sched *tick_get_tick_sched(int cpu);