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utils: Use WFE/SEV in spinlock

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This should reduce memory traffic spam and power usage from lock
contention when threads are blocked on a spinlock.

Signed-off-by: Hector Martin <marcan@marcan.st>
This commit is contained in:
Hector Martin 2022-05-30 19:22:08 +09:00
parent dd111b22b8
commit 9c795fbdbf
1 changed files with 4 additions and 1 deletions
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5
src/utils.c
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@ -133,8 +133,10 @@ void spin_lock(spinlock_t *lock)
s64 free = -1;
while (!__atomic_compare_exchange_n(&lock->lock, &free, me, false, __ATOMIC_ACQUIRE,
__ATOMIC_RELAXED))
__ATOMIC_RELAXED)) {
free = -1;
sysop("wfe");
}
assert(__atomic_load_n(&lock->lock, __ATOMIC_RELAXED) == me);
lock->count++;
@ -147,6 +149,7 @@ void spin_unlock(spinlock_t *lock)
assert(lock->count > 0);
if (!--lock->count)
__atomic_store_n(&lock->lock, -1L, __ATOMIC_RELEASE);
sysop("sev");
}
bool is_heap(void *addr)