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SLEEPQUEUE(9): Optimize sleepq_set_timeout_sbt()

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Avoid an extra ISR disable/enable in SMP configurations.
This commit is contained in:
Sebastian Huber 2019-08-26 07:27:35 +02:00
parent b88cfdd422
commit c0dc524614
1 changed files with 3 additions and 2 deletions
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5
freebsd/sys/kern/subr_sleepqueue.c
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@ -465,12 +465,13 @@ sleepq_set_timeout_sbt(void *wchan, sbintime_t sbt, sbintime_t pr,
sbintime_t sbt_per_tick;
uint64_t expire;
cpu_self = _Thread_Dispatch_disable();
_ISR_lock_ISR_disable(&lock_context);
cpu_self = _Thread_Dispatch_disable_critical(&lock_context);
executing = _Per_CPU_Get_executing(cpu_self);
BSD_ASSERT(_Watchdog_Get_state(&executing->Timer.Watchdog) ==
WATCHDOG_INACTIVE);
_ISR_lock_ISR_disable_and_acquire(&executing->Timer.Lock, &lock_context);
_ISR_lock_Acquire(&executing->Timer.Lock, &lock_context);
header = &cpu_self->Watchdog.Header[PER_CPU_WATCHDOG_TICKS];
executing->Timer.header = header;