In `test/hotspot/jtreg/vmTestbase/nsk/monitoring/MemoryPoolMBean/isUsageThresholdExceeded/isexceeded001.java`, the relevant logic is roughly:

```
monitor.resetPeakUsage(pool);

isExceeded = monitor.isUsageThresholdExceeded(pool);

b = new byte[INCREMENT];

isExceeded = monitor.isUsageThresholdExceeded(pool);

if (peakUsed >= threshold && !isExceeded) {
    isExceeded = monitor.isUsageThresholdExceeded(pool);
    if (isExceeded) {
        // OK
    } else {
        // failure
    }
}
```

The intention of this test is to verify that when `peakUsed` exceeds the threshold, the result of `isUsageThresholdExceeded` should be consistent.

However, `isUsageThresholdExceeded` checks the **current usage**, not the peak usage. The `new byte[INCREMENT]` allocation may trigger a GC, which can reduce the current memory usage. As a result, the second assignment to `isExceeded` can overwrite a previously observed `true` value with `false`.

One possible fix is to avoid losing the "exceeded" observation by combining the results:

```
isExceeded = isExceeded || monitor.isUsageThresholdExceeded(pool);
```

This ensures that once the threshold is observed as exceeded, a later GC-induced drop in current usage will not mask it.