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8373497: SpinCriticalSection should use SpinYield

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Reviewed-by: dholmes, coleenp
This commit is contained in:
Anton Artemov 2025-12-15 08:39:47 +00:00
parent 01adf28c94
commit 5141e1a4f4
1 changed files with 4 additions and 15 deletions
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19
src/hotspot/share/utilities/spinCriticalSection.cpp
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@ -24,30 +24,19 @@
#include "runtime/atomicAccess.hpp"
#include "utilities/spinCriticalSection.hpp"
#include "utilities/spinYield.hpp"
void SpinCriticalSection::spin_acquire(volatile int* adr) {
if (AtomicAccess::cmpxchg(adr, 0, 1) == 0) {
return; // normal fast-path return
}
SpinYield sy(4096, 5, millis_to_nanos(1));
// Slow-path : We've encountered contention -- Spin/Yield/Block strategy.
int ctr = 0;
int Yields = 0;
for (;;) {
while (*adr != 0) {
++ctr;
if ((ctr & 0xFFF) == 0 || !os::is_MP()) {
if (Yields > 5) {
os::naked_short_sleep(1);
}
else {
os::naked_yield();
++Yields;
}
}
else {
SpinPause();
}
sy.wait();
}
if (AtomicAccess::cmpxchg(adr, 0, 1) == 0) return;
}