[K/N] Add API for garbage collection statistics

^KT-53064
2022-10-04 14:58:01 +02:00
parent cdf6ffa167
commit 0be789e9e3
6 changed files with 343 additions and 3 deletions
@@ -0,0 +1,63 @@
+/*
+ * Copyright 2010-2022 JetBrains s.r.o. and Kotlin Programming Language contributors.
+ * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
+ */
+
+@file:OptIn(kotlin.ExperimentalStdlibApi::class)
+
+import kotlin.native.internal.GC
+import kotlin.test.*
+
+
+@Test
+fun `nothing new collected`() {
+    GC.collect()
+    GC.collect();
+    val stat = GC.lastGCInfo
+    assertNotNull(stat)
+    assertEquals(stat.memoryUsageBefore.keys, stat.memoryUsageAfter.keys)
+    for (key in stat.memoryUsageBefore.keys) {
+        assertEquals(stat.memoryUsageBefore[key]!!.objectsCount, stat.memoryUsageAfter[key]!!.objectsCount)
+        assertEquals(stat.memoryUsageBefore[key]!!.totalObjectsSizeBytes, stat.memoryUsageAfter[key]!!.totalObjectsSizeBytes)
+    }
+}
+
+object Global {
+    val x = listOf(1, 2, 3)
+}
+
+@Test
+fun `stable refs in root set`() {
+    GC.collect()
+    val stat0 = GC.lastGCInfo
+    assertNotNull(stat0)
+    val rootSet0 = stat0.rootSet
+    assertNotNull(rootSet0)
+    val x = listOf(1, 2, 3)
+    val stable = kotlinx.cinterop.StableRef.create(x)
+    GC.collect();
+    val stat1 = GC.lastGCInfo
+    assertNotNull(stat1)
+    val rootSet1 = stat1.rootSet
+    assertNotNull(rootSet1)
+    assertEquals(rootSet0.stableReferences + 1, rootSet1.stableReferences)
+    stable.dispose()
+    Global.x // to initialize and register global object
+    GC.collect();
+    val stat2 = GC.lastGCInfo
+    assertNotNull(stat2)
+    val rootSet2 = stat2.rootSet
+    assertNotNull(rootSet2)
+    assertEquals(rootSet0.stableReferences, rootSet2.stableReferences)
+    assertEquals(rootSet1.globalReferences + 1, rootSet2.globalReferences)
+}
+
+@Test
+fun `check everything is filled at the end`() {
+    GC.collect()
+    val stat = GC.lastGCInfo
+    assertNotNull(stat)
+    // GC.collect is waiting for finalizers, so it should bet not null
+    assertNotNull(stat.postGcCleanupTimeNs)
+}
+