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Merge "Use resetJitCounters for boot image profiling"

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Mathieu Chartier
2019-11-27 18:55:38 +00:00
committed by Gerrit Code Review
parent 10f4d427cd d886cfe2bc
commit ce9a776f1d
1 changed files with 16 additions and 12 deletions
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28
core/java/com/android/internal/os/ZygoteInit.java
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@@ -248,18 +248,6 @@ public class ZygoteInit {
InputStream is; InputStream is;
try { try {
// If we are profiling the boot image, avoid preloading classes.
// Can't use device_config since we are the zygote.
String prop = SystemProperties.get(
"persist.device_config.runtime_native_boot.profilebootclasspath", "");
// Might be empty if the property is unset since the default is "".
if (prop.length() == 0) {
prop = SystemProperties.get("dalvik.vm.profilebootclasspath", "");
}
if ("true".equals(prop)) {
return;
}
is = new FileInputStream(PRELOADED_CLASSES); is = new FileInputStream(PRELOADED_CLASSES);
} catch (FileNotFoundException e) { } catch (FileNotFoundException e) {
Log.e(TAG, "Couldn't find " + PRELOADED_CLASSES + "."); Log.e(TAG, "Couldn't find " + PRELOADED_CLASSES + ".");
@@ -339,6 +327,22 @@ public class ZygoteInit {
runtime.preloadDexCaches(); runtime.preloadDexCaches();
Trace.traceEnd(Trace.TRACE_TAG_DALVIK); Trace.traceEnd(Trace.TRACE_TAG_DALVIK);
// If we are profiling the boot image, reset the Jit counters after preloading the
// classes. We want to preload for performance, and we can use method counters to
// infer what clases are used after calling resetJitCounters, for profile purposes.
// Can't use device_config since we are the zygote.
String prop = SystemProperties.get(
"persist.device_config.runtime_native_boot.profilebootclasspath", "");
// Might be empty if the property is unset since the default is "".
if (prop.length() == 0) {
prop = SystemProperties.get("dalvik.vm.profilebootclasspath", "");
}
if ("true".equals(prop)) {
Trace.traceBegin(Trace.TRACE_TAG_DALVIK, "ResetJitCounters");
runtime.resetJitCounters();
Trace.traceEnd(Trace.TRACE_TAG_DALVIK);
}
// Bring back root. We'll need it later if we're in the zygote. // Bring back root. We'll need it later if we're in the zygote.
if (droppedPriviliges) { if (droppedPriviliges) {
try { try {