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
116 lines
3.5 KiB
C++
116 lines
3.5 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_H__
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#define _LOGD_LOG_BUFFER_H__
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#include <sys/types.h>
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#include <list>
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#include <string>
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#include <log/log.h>
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#include <sysutils/SocketClient.h>
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#include <private/android_filesystem_config.h>
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#include "LogBufferElement.h"
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#include "LogTimes.h"
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#include "LogStatistics.h"
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#include "LogWhiteBlackList.h"
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//
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// We are either in 1970ish (MONOTONIC) or 2015+ish (REALTIME) so to
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// differentiate without prejudice, we use 1980 to delineate, earlier
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// is monotonic, later is real.
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//
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namespace android {
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static bool isMonotonic(const log_time &mono) {
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static const uint32_t EPOCH_PLUS_10_YEARS = 10 * 1461 / 4 * 24 * 60 * 60;
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return mono.tv_sec < EPOCH_PLUS_10_YEARS;
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}
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}
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typedef std::list<LogBufferElement *> LogBufferElementCollection;
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class LogBuffer {
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LogBufferElementCollection mLogElements;
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pthread_mutex_t mLogElementsLock;
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LogStatistics stats;
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PruneList mPrune;
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// watermark of any worst/chatty uid processing
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typedef std::unordered_map<uid_t,
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LogBufferElementCollection::iterator>
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LogBufferIteratorMap;
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LogBufferIteratorMap mLastWorstUid[LOG_ID_MAX];
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unsigned long mMaxSize[LOG_ID_MAX];
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bool monotonic;
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public:
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LastLogTimes &mTimes;
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LogBuffer(LastLogTimes *times);
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void init();
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bool isMonotonic() { return monotonic; }
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int log(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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uint64_t flushTo(SocketClient *writer, const uint64_t start,
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bool privileged,
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int (*filter)(const LogBufferElement *element, void *arg) = NULL,
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void *arg = NULL);
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bool clear(log_id_t id, uid_t uid = AID_ROOT);
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unsigned long getSize(log_id_t id);
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int setSize(log_id_t id, unsigned long size);
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unsigned long getSizeUsed(log_id_t id);
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// *strp uses malloc, use free to release.
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std::string formatStatistics(uid_t uid, unsigned int logMask);
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void enableStatistics() {
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stats.enableStatistics();
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}
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int initPrune(const char *cp) { return mPrune.init(cp); }
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std::string formatPrune() { return mPrune.format(); }
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// helper must be protected directly or implicitly by lock()/unlock()
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const char *pidToName(pid_t pid) { return stats.pidToName(pid); }
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uid_t pidToUid(pid_t pid) { return stats.pidToUid(pid); }
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const char *uidToName(uid_t uid) { return stats.uidToName(uid); }
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void lock() { pthread_mutex_lock(&mLogElementsLock); }
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void unlock() { pthread_mutex_unlock(&mLogElementsLock); }
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private:
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static constexpr size_t minPrune = 4;
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static constexpr size_t maxPrune = 256;
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void maybePrune(log_id_t id);
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bool prune(log_id_t id, unsigned long pruneRows, uid_t uid = AID_ROOT);
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LogBufferElementCollection::iterator erase(
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LogBufferElementCollection::iterator it, bool coalesce = false);
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};
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#endif // _LOGD_LOG_BUFFER_H__
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