Trace.java revision 1ded0b1f6af65c2f95f8327f7f3df4cee1bf2346
1481c1570dc5cdf58265b53f657801709dd05d1dfJeff Brown/* 2481c1570dc5cdf58265b53f657801709dd05d1dfJeff Brown * Copyright (C) 2012 The Android Open Source Project 3481c1570dc5cdf58265b53f657801709dd05d1dfJeff Brown * 4481c1570dc5cdf58265b53f657801709dd05d1dfJeff Brown * Licensed under the Apache License, Version 2.0 (the "License"); 5481c1570dc5cdf58265b53f657801709dd05d1dfJeff Brown * you may not use this file except in compliance with the License. 6481c1570dc5cdf58265b53f657801709dd05d1dfJeff Brown * You may obtain a copy of the License at 7481c1570dc5cdf58265b53f657801709dd05d1dfJeff Brown * 8481c1570dc5cdf58265b53f657801709dd05d1dfJeff Brown * http://www.apache.org/licenses/LICENSE-2.0 9481c1570dc5cdf58265b53f657801709dd05d1dfJeff Brown * 10481c1570dc5cdf58265b53f657801709dd05d1dfJeff Brown * Unless required by applicable law or agreed to in writing, software 11481c1570dc5cdf58265b53f657801709dd05d1dfJeff Brown * distributed under the License is distributed on an "AS IS" BASIS, 12481c1570dc5cdf58265b53f657801709dd05d1dfJeff Brown * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13481c1570dc5cdf58265b53f657801709dd05d1dfJeff Brown * See the License for the specific language governing permissions and 14481c1570dc5cdf58265b53f657801709dd05d1dfJeff Brown * limitations under the License. 15481c1570dc5cdf58265b53f657801709dd05d1dfJeff Brown */ 16481c1570dc5cdf58265b53f657801709dd05d1dfJeff Brown 17481c1570dc5cdf58265b53f657801709dd05d1dfJeff Brownpackage android.os; 18481c1570dc5cdf58265b53f657801709dd05d1dfJeff Brown 19481c1570dc5cdf58265b53f657801709dd05d1dfJeff Brown/** 20481c1570dc5cdf58265b53f657801709dd05d1dfJeff Brown * Writes trace events to the kernel trace buffer. These trace events can be 21481c1570dc5cdf58265b53f657801709dd05d1dfJeff Brown * collected using the "atrace" program for offline analysis. 22481c1570dc5cdf58265b53f657801709dd05d1dfJeff Brown * 23481c1570dc5cdf58265b53f657801709dd05d1dfJeff Brown * This tracing mechanism is independent of the method tracing mechanism 24481c1570dc5cdf58265b53f657801709dd05d1dfJeff Brown * offered by {@link Debug#startMethodTracing}. In particular, it enables 25481c1570dc5cdf58265b53f657801709dd05d1dfJeff Brown * tracing of events that occur across processes. 26481c1570dc5cdf58265b53f657801709dd05d1dfJeff Brown * 27481c1570dc5cdf58265b53f657801709dd05d1dfJeff Brown * @hide 28481c1570dc5cdf58265b53f657801709dd05d1dfJeff Brown */ 29481c1570dc5cdf58265b53f657801709dd05d1dfJeff Brownpublic final class Trace { 30481c1570dc5cdf58265b53f657801709dd05d1dfJeff Brown // These tags must be kept in sync with frameworks/native/include/utils/Trace.h. 31481c1570dc5cdf58265b53f657801709dd05d1dfJeff Brown public static final long TRACE_TAG_NEVER = 0; 32481c1570dc5cdf58265b53f657801709dd05d1dfJeff Brown public static final long TRACE_TAG_ALWAYS = 1L << 0; 33481c1570dc5cdf58265b53f657801709dd05d1dfJeff Brown public static final long TRACE_TAG_GRAPHICS = 1L << 1; 34481c1570dc5cdf58265b53f657801709dd05d1dfJeff Brown public static final long TRACE_TAG_INPUT = 1L << 2; 35481c1570dc5cdf58265b53f657801709dd05d1dfJeff Brown public static final long TRACE_TAG_VIEW = 1L << 3; 36192a65e9f6ebdc452520e19f95c68c270b3f96daChris Craik public static final long TRACE_TAG_WEBVIEW = 1L << 4; 371ded0b1f6af65c2f95f8327f7f3df4cee1bf2346Dianne Hackborn public static final long TRACE_TAG_WINDOW_MANAGER = 1L << 5; 381ded0b1f6af65c2f95f8327f7f3df4cee1bf2346Dianne Hackborn public static final long TRACE_TAG_ACTIVITY_MANAGER = 1L << 6; 39481c1570dc5cdf58265b53f657801709dd05d1dfJeff Brown 40481c1570dc5cdf58265b53f657801709dd05d1dfJeff Brown private static final long sEnabledTags = nativeGetEnabledTags(); 41481c1570dc5cdf58265b53f657801709dd05d1dfJeff Brown 42481c1570dc5cdf58265b53f657801709dd05d1dfJeff Brown private static native long nativeGetEnabledTags(); 43481c1570dc5cdf58265b53f657801709dd05d1dfJeff Brown private static native void nativeTraceCounter(long tag, String name, int value); 44481c1570dc5cdf58265b53f657801709dd05d1dfJeff Brown private static native void nativeTraceBegin(long tag, String name); 45481c1570dc5cdf58265b53f657801709dd05d1dfJeff Brown private static native void nativeTraceEnd(long tag); 46481c1570dc5cdf58265b53f657801709dd05d1dfJeff Brown 47481c1570dc5cdf58265b53f657801709dd05d1dfJeff Brown private Trace() { 48481c1570dc5cdf58265b53f657801709dd05d1dfJeff Brown } 49481c1570dc5cdf58265b53f657801709dd05d1dfJeff Brown 50481c1570dc5cdf58265b53f657801709dd05d1dfJeff Brown /** 51481c1570dc5cdf58265b53f657801709dd05d1dfJeff Brown * Returns true if a trace tag is enabled. 52481c1570dc5cdf58265b53f657801709dd05d1dfJeff Brown * 53481c1570dc5cdf58265b53f657801709dd05d1dfJeff Brown * @param traceTag The trace tag to check. 54481c1570dc5cdf58265b53f657801709dd05d1dfJeff Brown * @return True if the trace tag is valid. 55481c1570dc5cdf58265b53f657801709dd05d1dfJeff Brown */ 56481c1570dc5cdf58265b53f657801709dd05d1dfJeff Brown public static boolean isTagEnabled(long traceTag) { 57481c1570dc5cdf58265b53f657801709dd05d1dfJeff Brown return (sEnabledTags & traceTag) != 0; 58481c1570dc5cdf58265b53f657801709dd05d1dfJeff Brown } 59481c1570dc5cdf58265b53f657801709dd05d1dfJeff Brown 60481c1570dc5cdf58265b53f657801709dd05d1dfJeff Brown /** 61481c1570dc5cdf58265b53f657801709dd05d1dfJeff Brown * Writes trace message to indicate the value of a given counter. 62481c1570dc5cdf58265b53f657801709dd05d1dfJeff Brown * 63481c1570dc5cdf58265b53f657801709dd05d1dfJeff Brown * @param traceTag The trace tag. 64481c1570dc5cdf58265b53f657801709dd05d1dfJeff Brown * @param counterName The counter name to appear in the trace. 65481c1570dc5cdf58265b53f657801709dd05d1dfJeff Brown * @param counterValue The counter value. 66481c1570dc5cdf58265b53f657801709dd05d1dfJeff Brown */ 67481c1570dc5cdf58265b53f657801709dd05d1dfJeff Brown public static void traceCounter(long traceTag, String counterName, int counterValue) { 68481c1570dc5cdf58265b53f657801709dd05d1dfJeff Brown if ((sEnabledTags & traceTag) != 0) { 69481c1570dc5cdf58265b53f657801709dd05d1dfJeff Brown nativeTraceCounter(traceTag, counterName, counterValue); 70481c1570dc5cdf58265b53f657801709dd05d1dfJeff Brown } 71481c1570dc5cdf58265b53f657801709dd05d1dfJeff Brown } 72481c1570dc5cdf58265b53f657801709dd05d1dfJeff Brown 73481c1570dc5cdf58265b53f657801709dd05d1dfJeff Brown /** 74481c1570dc5cdf58265b53f657801709dd05d1dfJeff Brown * Writes a trace message to indicate that a given method has begun. 75481c1570dc5cdf58265b53f657801709dd05d1dfJeff Brown * Must be followed by a call to {@link #traceEnd} using the same tag. 76481c1570dc5cdf58265b53f657801709dd05d1dfJeff Brown * 77481c1570dc5cdf58265b53f657801709dd05d1dfJeff Brown * @param traceTag The trace tag. 78481c1570dc5cdf58265b53f657801709dd05d1dfJeff Brown * @param methodName The method name to appear in the trace. 79481c1570dc5cdf58265b53f657801709dd05d1dfJeff Brown */ 80481c1570dc5cdf58265b53f657801709dd05d1dfJeff Brown public static void traceBegin(long traceTag, String methodName) { 81481c1570dc5cdf58265b53f657801709dd05d1dfJeff Brown if ((sEnabledTags & traceTag) != 0) { 82481c1570dc5cdf58265b53f657801709dd05d1dfJeff Brown nativeTraceBegin(traceTag, methodName); 83481c1570dc5cdf58265b53f657801709dd05d1dfJeff Brown } 84481c1570dc5cdf58265b53f657801709dd05d1dfJeff Brown } 85481c1570dc5cdf58265b53f657801709dd05d1dfJeff Brown 86481c1570dc5cdf58265b53f657801709dd05d1dfJeff Brown /** 87481c1570dc5cdf58265b53f657801709dd05d1dfJeff Brown * Writes a trace message to indicate that the current method has ended. 88481c1570dc5cdf58265b53f657801709dd05d1dfJeff Brown * Must be called exactly once for each call to {@link #traceBegin} using the same tag. 89481c1570dc5cdf58265b53f657801709dd05d1dfJeff Brown * 90481c1570dc5cdf58265b53f657801709dd05d1dfJeff Brown * @param traceTag The trace tag. 91481c1570dc5cdf58265b53f657801709dd05d1dfJeff Brown */ 92481c1570dc5cdf58265b53f657801709dd05d1dfJeff Brown public static void traceEnd(long traceTag) { 93481c1570dc5cdf58265b53f657801709dd05d1dfJeff Brown if ((sEnabledTags & traceTag) != 0) { 94481c1570dc5cdf58265b53f657801709dd05d1dfJeff Brown nativeTraceEnd(traceTag); 95481c1570dc5cdf58265b53f657801709dd05d1dfJeff Brown } 96481c1570dc5cdf58265b53f657801709dd05d1dfJeff Brown } 97481c1570dc5cdf58265b53f657801709dd05d1dfJeff Brown} 98