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Fixed container memory pressure

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- Container pressure excludes committed heap the JVM is not using
- Reclaim, pregen gating and status text use the adjusted figure
- Tests cover the committed heap subtraction
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Brian Neumann-Fopiano committed 2026-10-28 13:15:35 -04:00
1 parent 3dc958edcf
commit 300ecbfc8b
2 files changed
+61 -7
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core/src/test/java/art/arcane/iris/world/pregen/MantleContainerPressureTest.java
+36
View File
@@ -1,5 +1,6 @@
package art.arcane.iris.world.pregen;
import art.arcane.volmlib.util.diagnostics.ContainerMemory;
import org.junit.Test;
import java.util.concurrent.atomic.AtomicLong;
@@ -9,6 +10,8 @@ import static org.junit.Assert.assertFalse;
import static org.junit.Assert.assertTrue;
public class MantleContainerPressureTest {
private static final long MIB = 1L << 20;
@Test
public void containerPressureReclaimsEvenWhenTheHeapHasHeadroom() {
double pressure = MantleHeapPressure.pressureFraction(0.45D, 0.90D);
@@ -39,4 +42,37 @@ public class MantleContainerPressureTest {
assertTrue(gate.update(0.85D));
assertFalse(gate.update(0.80D));
}
@Test
public void freeCommittedHeapDoesNotCountAsContainerPressure() {
ContainerMemory.Snapshot container = containerAt(8_601L * MIB, 8_240L * MIB);
double containerPressure = MantleHeapPressure.containerPressureFraction(container, 7_388L * MIB, 2_355L * MIB);
assertEquals((8_240D - 5_033D) / 8_601D, containerPressure, 1E-9D);
assertEquals(0D, MantleHeapPressure.reclaimUrgency(MantleHeapPressure.pressureFraction(0.31D, containerPressure)), 0D);
}
@Test
public void heapFillingItsCommittedSpaceStillRaisesContainerPressure() {
ContainerMemory.Snapshot container = containerAt(8_601L * MIB, 8_240L * MIB);
double containerPressure = MantleHeapPressure.containerPressureFraction(container, 7_388L * MIB, 7_200L * MIB);
assertTrue(containerPressure >= 0.90D);
assertEquals(1D, MantleHeapPressure.reclaimUrgency(MantleHeapPressure.pressureFraction(0.94D, containerPressure)), 0D);
}
@Test
public void containerPressureNeverDropsBelowZero() {
ContainerMemory.Snapshot container = containerAt(4_096L * MIB, 1_024L * MIB);
assertEquals(0D, MantleHeapPressure.containerPressureFraction(container, 3_072L * MIB, 512L * MIB), 0D);
}
@Test
public void unlimitedContainersReportNoContainerPressure() {
ContainerMemory.Snapshot container = new ContainerMemory.Snapshot(Long.MAX_VALUE, 0L, 0L, 0D, Long.MAX_VALUE);
assertEquals(0D, MantleHeapPressure.containerPressureFraction(container, 7_388L * MIB, 2_355L * MIB), 0D);
}
private static ContainerMemory.Snapshot containerAt(long limitBytes, long workingSetBytes) {
return new ContainerMemory.Snapshot(limitBytes, workingSetBytes, workingSetBytes,
workingSetBytes / (double) limitBytes, limitBytes - workingSetBytes);
}
}