85cce376cb
EventLog can be used from SurfaceFlinger to log jank statistics events to the binary event log. Change-Id: If0fbbe7d7111f10957697166d37fd0c3418109bb
129 lines
3.6 KiB
C++
129 lines
3.6 KiB
C++
/*
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* Copyright 2013 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <cutils/log.h>
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#include <utils/String8.h>
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#include "EventLog.h"
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// ---------------------------------------------------------------------------
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namespace android {
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// ---------------------------------------------------------------------------
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ANDROID_SINGLETON_STATIC_INSTANCE(EventLog)
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EventLog::EventLog() {
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}
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void EventLog::doLogJank(const String8& window, int32_t value) {
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EventLog::TagBuffer buffer(LOGTAG_SF_JANK);
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buffer.startList(2);
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buffer.writeString8(window);
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buffer.writeInt32(value);
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buffer.endList();
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buffer.log();
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}
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void EventLog::logJank(const String8& window, int32_t value) {
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EventLog::getInstance().doLogJank(window, value);
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}
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// ---------------------------------------------------------------------------
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EventLog::TagBuffer::TagBuffer(int32_t tag)
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: mPos(0), mTag(tag), mOverflow(false) {
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}
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void EventLog::TagBuffer::log() {
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if (mOverflow) {
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ALOGW("couldn't log to binary event log: overflow.");
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} else if (android_bWriteLog(mTag, mStorage, mPos) < 0) {
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ALOGE("couldn't log to EventLog: %s", strerror(errno));
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}
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// purge the buffer
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mPos = 0;
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mOverflow = false;
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}
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void EventLog::TagBuffer::startList(int8_t count) {
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if (mOverflow) return;
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const size_t needed = 1 + sizeof(count);
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if (mPos + needed > STORAGE_MAX_SIZE) {
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mOverflow = true;
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return;
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}
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mStorage[mPos + 0] = EVENT_TYPE_LIST;
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mStorage[mPos + 1] = count;
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mPos += needed;
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}
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void EventLog::TagBuffer::endList() {
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if (mOverflow) return;
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const size_t needed = 1;
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if (mPos + needed > STORAGE_MAX_SIZE) {
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mOverflow = true;
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return;
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}
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mStorage[mPos + 0] = '\n';
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mPos += needed;
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}
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void EventLog::TagBuffer::writeInt32(int32_t value) {
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if (mOverflow) return;
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const size_t needed = 1 + sizeof(value);
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if (mPos + needed > STORAGE_MAX_SIZE) {
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mOverflow = true;
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return;
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}
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mStorage[mPos + 0] = EVENT_TYPE_INT;
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memcpy(&mStorage[mPos + 1], &value, sizeof(value));
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mPos += needed;
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}
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void EventLog::TagBuffer::writeInt64(int64_t value) {
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if (mOverflow) return;
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const size_t needed = 1 + sizeof(value);
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if (mPos + needed > STORAGE_MAX_SIZE) {
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mOverflow = true;
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return;
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}
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mStorage[mPos + 0] = EVENT_TYPE_LONG;
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memcpy(&mStorage[mPos + 1], &value, sizeof(value));
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mPos += needed;
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}
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void EventLog::TagBuffer::writeString8(const String8& value) {
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if (mOverflow) return;
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const int32_t stringLen = value.length();
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const size_t needed = 1 + sizeof(int32_t) + stringLen;
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if (mPos + needed > STORAGE_MAX_SIZE) {
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mOverflow = true;
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return;
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}
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mStorage[mPos + 0] = EVENT_TYPE_STRING;
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memcpy(&mStorage[mPos + 1], &stringLen, sizeof(int32_t));
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memcpy(&mStorage[mPos + 5], value.string(), stringLen);
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mPos += needed;
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}
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// ---------------------------------------------------------------------------
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}// namespace android
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// ---------------------------------------------------------------------------
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