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nohz: Gather tick_sched booleans under a common flag field 

Optimize the space and leave plenty of room for further flags.

Signed-off-by: Frederic Weisbecker <frederic@kernel.org>
[ rjw: Do not use __this_cpu_read() to access tick_stopped and add
       got_idle_tick to avoid overloading inidle ]
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Frederic Weisbecker 2018-04-06 04:32:37 +02:00 committed by Rafael J. Wysocki
parent 87c9fe6ee4
commit 2bc629a692
2 changed files with 15 additions and 9 deletions
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12
kernel/time/tick-sched.c
View File

@ -465,7 +465,9 @@ __setup("nohz=", setup_tick_nohz);
bool tick_nohz_tick_stopped(void)
{
return __this_cpu_read(tick_cpu_sched.tick_stopped);
struct tick_sched *ts = this_cpu_ptr(&tick_cpu_sched);
return ts->tick_stopped;
}
bool tick_nohz_tick_stopped_cpu(int cpu)
@ -1014,8 +1016,8 @@ bool tick_nohz_idle_got_tick(void)
{
struct tick_sched *ts = this_cpu_ptr(&tick_cpu_sched);
if (ts->inidle > 1) {
ts->inidle = 1;
if (ts->got_idle_tick) {
ts->got_idle_tick = 0;
return true;
}
return false;
@ -1161,7 +1163,7 @@ static void tick_nohz_handler(struct clock_event_device *dev)
ktime_t now = ktime_get();
if (ts->inidle)
ts->inidle = 2;
ts->got_idle_tick = 1;
dev->next_event = KTIME_MAX;
@ -1261,7 +1263,7 @@ static enum hrtimer_restart tick_sched_timer(struct hrtimer *timer)
ktime_t now = ktime_get();
if (ts->inidle)
ts->inidle = 2;
ts->got_idle_tick = 1;
tick_sched_do_timer(now);

12
kernel/time/tick-sched.h
View File

@ -41,19 +41,24 @@ enum tick_nohz_mode {
* @timer_expires: Anticipated timer expiration time (in case sched tick is stopped)
* @timer_expires_base: Base time clock monotonic for @timer_expires
* @do_timer_lst: CPU was the last one doing do_timer before going idle
* @got_idle_tick: Tick timer function has run with @inidle set
*/
struct tick_sched {
struct hrtimer sched_timer;
unsigned long check_clocks;
enum tick_nohz_mode nohz_mode;
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;
ktime_t last_tick;
ktime_t next_tick;
int inidle;
int tick_stopped;
unsigned long idle_jiffies;
unsigned long idle_calls;
unsigned long idle_sleeps;
int idle_active;
ktime_t idle_entrytime;
ktime_t idle_waketime;
ktime_t idle_exittime;
@ -64,7 +69,6 @@ struct tick_sched {
u64 timer_expires_base;
u64 next_timer;
ktime_t idle_expires;
int do_timer_last;
atomic_t tick_dep_mask;
};