getRuntimeStat() support (ART).
Export some runtime stats (currently GC stats) via
VMDebug.getRuntimeStat().
Added several new GC stats such as blocking GC counts and GC count
histograms.
Bug: 19825248
Change-Id: I8ece9ed241dc3982dfd983d7159090ba82940dce
diff --git a/test/099-vmdebug/src/Main.java b/test/099-vmdebug/src/Main.java
index 4d781c3..a8db069 100644
--- a/test/099-vmdebug/src/Main.java
+++ b/test/099-vmdebug/src/Main.java
@@ -17,6 +17,7 @@
import java.io.File;
import java.io.IOException;
import java.lang.reflect.Method;
+import java.util.Map;
public class Main {
public static void main(String[] args) throws Exception {
@@ -26,6 +27,7 @@
return;
}
testMethodTracing();
+ testRuntimeStat();
}
private static File createTempFile() throws Exception {
@@ -109,10 +111,108 @@
tempFile.delete();
}
+ private static void checkNumber(String s) throws Exception {
+ if (s == null) {
+ System.out.println("Got null string");
+ return;
+ }
+ long n = Long.valueOf(s);
+ if (n < 0) {
+ System.out.println("Got negative number " + n);
+ }
+ }
+
+ private static void checkHistogram(String s) throws Exception {
+ if (s == null || s.length() == 0) {
+ System.out.println("Got null or empty string");
+ return;
+ }
+ String[] buckets = s.split(",");
+ long last_key = 0;
+ for (int i = 0; i < buckets.length; ++i) {
+ String bucket = buckets[i];
+ if (bucket.length() == 0) {
+ System.out.println("Got empty bucket");
+ continue;
+ }
+ String[] kv = bucket.split(":");
+ if (kv.length != 2 || kv[0].length() == 0 || kv[1].length() == 0) {
+ System.out.println("Got bad bucket " + bucket);
+ continue;
+ }
+ long key = Long.valueOf(kv[0]);
+ long value = Long.valueOf(kv[1]);
+ if (key < 0 || value < 0) {
+ System.out.println("Got negative key or value " + bucket);
+ continue;
+ }
+ if (key < last_key) {
+ System.out.println("Got decreasing key " + bucket);
+ continue;
+ }
+ last_key = key;
+ }
+ }
+
+ private static void testRuntimeStat() throws Exception {
+ // Invoke at least one GC and wait for 20 seconds or so so we get at
+ // least one bucket in the histograms.
+ for (int i = 0; i < 20; ++i) {
+ Runtime.getRuntime().gc();
+ Thread.sleep(1000L);
+ }
+ String gc_count = VMDebug.getRuntimeStat("art.gc.gc-count");
+ String gc_time = VMDebug.getRuntimeStat("art.gc.gc-time");
+ String bytes_allocated = VMDebug.getRuntimeStat("art.gc.bytes-allocated");
+ String bytes_freed = VMDebug.getRuntimeStat("art.gc.bytes-freed");
+ String blocking_gc_count = VMDebug.getRuntimeStat("art.gc.blocking-gc-count");
+ String blocking_gc_time = VMDebug.getRuntimeStat("art.gc.blocking-gc-time");
+ String gc_count_rate_histogram = VMDebug.getRuntimeStat("art.gc.gc-count-rate-histogram");
+ String blocking_gc_count_rate_histogram =
+ VMDebug.getRuntimeStat("art.gc.blocking-gc-count-rate-histogram");
+ checkNumber(gc_count);
+ checkNumber(gc_time);
+ checkNumber(bytes_allocated);
+ checkNumber(bytes_freed);
+ checkNumber(blocking_gc_count);
+ checkNumber(blocking_gc_time);
+ checkHistogram(gc_count_rate_histogram);
+ checkHistogram(blocking_gc_count_rate_histogram);
+ }
+
+ private static void testRuntimeStats() throws Exception {
+ // Invoke at least one GC and wait for 20 seconds or so so we get at
+ // least one bucket in the histograms.
+ for (int i = 0; i < 20; ++i) {
+ Runtime.getRuntime().gc();
+ Thread.sleep(1000L);
+ }
+ Map<String, String> map = VMDebug.getRuntimeStats();
+ String gc_count = map.get("art.gc.gc-count");
+ String gc_time = map.get("art.gc.gc-time");
+ String bytes_allocated = map.get("art.gc.bytes-allocated");
+ String bytes_freed = map.get("art.gc.bytes-freed");
+ String blocking_gc_count = map.get("art.gc.blocking-gc-count");
+ String blocking_gc_time = map.get("art.gc.blocking-gc-time");
+ String gc_count_rate_histogram = map.get("art.gc.gc-count-rate-histogram");
+ String blocking_gc_count_rate_histogram =
+ map.get("art.gc.blocking-gc-count-rate-histogram");
+ checkNumber(gc_count);
+ checkNumber(gc_time);
+ checkNumber(bytes_allocated);
+ checkNumber(bytes_freed);
+ checkNumber(blocking_gc_count);
+ checkNumber(blocking_gc_time);
+ checkHistogram(gc_count_rate_histogram);
+ checkHistogram(blocking_gc_count_rate_histogram);
+ }
+
private static class VMDebug {
private static final Method startMethodTracingMethod;
private static final Method stopMethodTracingMethod;
private static final Method getMethodTracingModeMethod;
+ private static final Method getRuntimeStatMethod;
+ private static final Method getRuntimeStatsMethod;
static {
try {
Class c = Class.forName("dalvik.system.VMDebug");
@@ -120,6 +220,8 @@
Integer.TYPE, Integer.TYPE, Boolean.TYPE, Integer.TYPE);
stopMethodTracingMethod = c.getDeclaredMethod("stopMethodTracing");
getMethodTracingModeMethod = c.getDeclaredMethod("getMethodTracingMode");
+ getRuntimeStatMethod = c.getDeclaredMethod("getRuntimeStat", String.class);
+ getRuntimeStatsMethod = c.getDeclaredMethod("getRuntimeStats");
} catch (Exception e) {
throw new RuntimeException(e);
}
@@ -136,5 +238,11 @@
public static int getMethodTracingMode() throws Exception {
return (int) getMethodTracingModeMethod.invoke(null);
}
+ public static String getRuntimeStat(String statName) throws Exception {
+ return (String) getRuntimeStatMethod.invoke(null, statName);
+ }
+ public static Map<String, String> getRuntimeStats() throws Exception {
+ return (Map<String, String>) getRuntimeStatsMethod.invoke(null);
+ }
}
}