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8382135: AArch64: HotCodeCollectorMoveFunction.java fails intermittently

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Reviewed-by: eastigeevich, aph
This commit is contained in:
Chad Rakoczy 2026-06-30 19:44:04 +00:00
parent 4bf4a60f76
commit c7816b0b44
2 changed files with 18 additions and 10 deletions
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16
src/hotspot/share/runtime/hotCodeSampler.cpp
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@ -61,15 +61,13 @@ bool ThreadSampler::sample_all_java_threads() {
continue;
}
if (CodeCache::contains(pc)) {
nmethod* nm = CodeCache::find_blob(pc)->as_nmethod_or_null();
if (nm != nullptr) {
bool created = false;
int *count = _samples.put_if_absent(nm, 0, &created);
(*count)++;
if (created) {
_samples.maybe_grow();
}
CodeBlob* cb = CodeCache::find_blob(pc);
if (cb != nullptr && cb->is_nmethod()) {
bool created = false;
int *count = _samples.put_if_absent(cb->as_nmethod(), 0, &created);
(*count)++;
if (created) {
_samples.maybe_grow();
}
}
}

12
test/hotspot/jtreg/compiler/hotcode/HotCodeCollectorMoveFunction.java
View File

@ -79,6 +79,8 @@ public class HotCodeCollectorMoveFunction {
private static final int C2_LEVEL = 4;
private static final int FUNC_RUN_MILLIS = 60_000;
private static volatile int blackholeCount = 0;
static {
try {
method = Runner.class.getMethod("func");
@ -111,7 +113,15 @@ public class HotCodeCollectorMoveFunction {
public static void func() {
long start = System.currentTimeMillis();
while (System.currentTimeMillis() - start < FUNC_RUN_MILLIS) {}
while (System.currentTimeMillis() - start < FUNC_RUN_MILLIS) {
// Perform multiplicative LCG to ensure the compiler does not optimize away the code.
// Integer overflow is used for the modulus so the loop terminates after (2^32)/4 iterations
int num = 1;
do {
blackholeCount++;
num *= 69069;
} while (num != 1);
}
}
}
}