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timer: Add a global deferrable timer

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Add a global deferrable timer in addition to the per-cpu deferrable timer
to allow deferrable timers without the TIMER_PINNED flag to run
on any active CPU.

Change-Id: I8e6b77cef972589912ad18f324c46c936fbbb96f
Signed-off-by: Kyle Yan <kyan@codeaurora.org>
Signed-off-by: Prasad Sodagudi <psodagud@codeaurora.org>
This commit is contained in:
Kyle Yan 2017-02-24 16:49:27 -08:00 committed by Prasad Sodagudi
parent 58cc082cae
commit 3421f6b367
2 changed files with 17 additions and 4 deletions
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2
include/linux/timer.h
View File

@ -198,6 +198,8 @@ extern void add_timer(struct timer_list *timer);
extern int try_to_del_timer_sync(struct timer_list *timer);
extern struct timer_base timer_base_deferrable;
#ifdef CONFIG_SMP
extern int del_timer_sync(struct timer_list *timer);
#else

19
kernel/time/timer.c
View File

@ -208,6 +208,7 @@ struct timer_base {
} ____cacheline_aligned;
static DEFINE_PER_CPU(struct timer_base, timer_bases[NR_BASES]);
struct timer_base timer_base_deferrable;
#if defined(CONFIG_SMP) && defined(CONFIG_NO_HZ_COMMON)
unsigned int sysctl_timer_migration = 1;
@ -231,6 +232,9 @@ void timers_update_migration(bool update_nohz)
per_cpu(timer_bases[BASE_DEF].nohz_active, cpu) = true;
per_cpu(hrtimer_bases.nohz_active, cpu) = true;
}
timer_base_deferrable.migration_enabled = on;
timer_base_deferrable.nohz_active = true;
}
int timer_migration_handler(struct ctl_table *table, int write,
@ -817,8 +821,11 @@ static inline struct timer_base *get_timer_cpu_base(u32 tflags, u32 cpu)
* the deferrable base.
*/
if (IS_ENABLED(CONFIG_NO_HZ_COMMON) && base->nohz_active &&
(tflags & TIMER_DEFERRABLE))
base = per_cpu_ptr(&timer_bases[BASE_DEF], cpu);
(tflags & TIMER_DEFERRABLE)) {
base = &timer_base_deferrable;
if (tflags & TIMER_PINNED)
base = per_cpu_ptr(&timer_bases[BASE_DEF], cpu);
}
return base;
}
@ -832,7 +839,9 @@ static inline struct timer_base *get_timer_this_cpu_base(u32 tflags)
*/
if (IS_ENABLED(CONFIG_NO_HZ_COMMON) && base->nohz_active &&
(tflags & TIMER_DEFERRABLE))
base = this_cpu_ptr(&timer_bases[BASE_DEF]);
base = &timer_base_deferrable;
if (tflags & TIMER_PINNED)
base = this_cpu_ptr(&timer_bases[BASE_DEF]);
return base;
}
@ -1612,8 +1621,10 @@ static __latent_entropy void run_timer_softirq(struct softirq_action *h)
struct timer_base *base = this_cpu_ptr(&timer_bases[BASE_STD]);
__run_timers(base);
if (IS_ENABLED(CONFIG_NO_HZ_COMMON) && base->nohz_active)
if (IS_ENABLED(CONFIG_NO_HZ_COMMON) && base->nohz_active) {
__run_timers(&timer_base_deferrable);
__run_timers(this_cpu_ptr(&timer_bases[BASE_DEF]));
}
}
/*