58b8be8906
Chatty logs would distort the average log size by elevating the elements, but not the size. Add statistical collection for the number of elements that report chatty, and subtract that from the number of elements to improve the pruning estimate. Pick minElements as 1% rather than 10% of the total with this more accurate number of elements, to a minumum of 4. Bug: 24511000 Change-Id: I3f36558138aa0b2a50e4fac6440c3a8505d95276
98 lines
3.1 KiB
C++
98 lines
3.1 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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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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public:
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LastLogTimes &mTimes;
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LogBuffer(LastLogTimes *times);
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void init();
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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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