b6bee33182
if ro.logd.timestamp or persist.logd.timestamp are set to the value
monotonic then liblog writer, liblog printing and logd all switch to
recording/printing monotonic time rather than realtime. If reinit
detects a change for presist.logd.timestamp, correct the older entry
timestamps in place.
ToDo: A corner case condition where new log entries in monotonic time
occur before logd reinit detects persist.logd.timestamp, there
will be a few out-of-order entries, but with accurate
timestamps. This problem does not happen for ro.logd.timestamp
as it is set before logd starts.
NB: This offers a nano second time accuracy on all log entries
that may be more suitable for merging with other system
activities, such as systrace, that also use monotonic time. This
feature is for debugging.
Bug: 23668800
Change-Id: Iee6dab7140061b1a6627254921411f61b01aa5c2
86 lines
2.8 KiB
C++
86 lines
2.8 KiB
C++
/*
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* Copyright (C) 2012-2014 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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#ifndef _LOGD_LOG_BUFFER_ELEMENT_H__
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#define _LOGD_LOG_BUFFER_ELEMENT_H__
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#include <stdatomic.h>
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#include <stdlib.h>
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#include <sys/types.h>
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#include <sysutils/SocketClient.h>
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#include <log/log.h>
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#include <log/log_read.h>
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class LogBuffer;
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#define EXPIRE_HOUR_THRESHOLD 24 // Only expire chatty UID logs to preserve
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// non-chatty UIDs less than this age in hours
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#define EXPIRE_THRESHOLD 10 // A smaller expire count is considered too
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// chatty for the temporal expire messages
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#define EXPIRE_RATELIMIT 10 // maximum rate in seconds to report expiration
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class LogBufferElement {
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friend LogBuffer;
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const log_id_t mLogId;
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const uid_t mUid;
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const pid_t mPid;
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const pid_t mTid;
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char *mMsg;
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union {
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const unsigned short mMsgLen; // mMSg != NULL
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unsigned short mDropped; // mMsg == NULL
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};
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const uint64_t mSequence;
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log_time mRealTime;
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static atomic_int_fast64_t sequence;
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// assumption: mMsg == NULL
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size_t populateDroppedMessage(char *&buffer,
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LogBuffer *parent);
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public:
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LogBufferElement(log_id_t log_id, log_time realtime,
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uid_t uid, pid_t pid, pid_t tid,
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const char *msg, unsigned short len);
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virtual ~LogBufferElement();
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log_id_t getLogId() const { return mLogId; }
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uid_t getUid(void) const { return mUid; }
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pid_t getPid(void) const { return mPid; }
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pid_t getTid(void) const { return mTid; }
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unsigned short getDropped(void) const { return mMsg ? 0 : mDropped; }
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unsigned short setDropped(unsigned short value) {
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if (mMsg) {
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delete [] mMsg;
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mMsg = NULL;
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}
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return mDropped = value;
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}
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unsigned short getMsgLen() const { return mMsg ? mMsgLen : 0; }
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uint64_t getSequence(void) const { return mSequence; }
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static uint64_t getCurrentSequence(void) { return sequence.load(memory_order_relaxed); }
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log_time getRealTime(void) const { return mRealTime; }
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uint32_t getTag(void) const;
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static const uint64_t FLUSH_ERROR;
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uint64_t flushTo(SocketClient *writer, LogBuffer *parent);
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};
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#endif
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