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/*
* Copyright (C) 2014 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef _LOGD_LOG_STATISTICS_H__
#define _LOGD_LOG_STATISTICS_H__
#include <memory>
#include <stdlib.h>
#include <sys/types.h>
#include <algorithm> // std::max
#include <string> // std::string
#include <unordered_map>
#include <android-base/stringprintf.h>
#include <log/log.h>
#include <private/android_filesystem_config.h>
#include "LogBufferElement.h"
#include "LogUtils.h"
#define log_id_for_each(i) \
for (log_id_t i = LOG_ID_MIN; (i) < LOG_ID_MAX; (i) = (log_id_t) ((i) + 1))
class LogStatistics;
template <typename TKey, typename TEntry>
class LogHashtable {
std::unordered_map<TKey, TEntry> map;
public:
typedef typename std::unordered_map<TKey, TEntry>::iterator iterator;
typedef typename std::unordered_map<TKey, TEntry>::const_iterator const_iterator;
std::unique_ptr<const TEntry *[]> sort(uid_t uid, pid_t pid,
size_t len) const {
if (!len) {
std::unique_ptr<const TEntry *[]> sorted(NULL);
return sorted;
}
const TEntry **retval = new const TEntry* [len];
memset(retval, 0, sizeof(*retval) * len);
for(const_iterator it = map.begin(); it != map.end(); ++it) {
const TEntry &entry = it->second;
if ((uid != AID_ROOT) && (uid != entry.getUid())) {
continue;
}
if (pid && entry.getPid() && (pid != entry.getPid())) {
continue;
}
size_t sizes = entry.getSizes();
ssize_t index = len - 1;
while ((!retval[index] || (sizes > retval[index]->getSizes()))
&& (--index >= 0))
;
if (++index < (ssize_t)len) {
size_t num = len - index - 1;
if (num) {
memmove(&retval[index + 1], &retval[index],
num * sizeof(retval[0]));
}
retval[index] = &entry;
}
}
std::unique_ptr<const TEntry *[]> sorted(retval);
return sorted;
}
inline iterator add(TKey key, LogBufferElement *element) {
iterator it = map.find(key);
if (it == map.end()) {
it = map.insert(std::make_pair(key, TEntry(element))).first;
} else {
it->second.add(element);
}
return it;
}
inline iterator add(TKey key) {
iterator it = map.find(key);
if (it == map.end()) {
it = map.insert(std::make_pair(key, TEntry(key))).first;
} else {
it->second.add(key);
}
return it;
}
void subtract(TKey key, LogBufferElement *element) {
iterator it = map.find(key);
if ((it != map.end()) && it->second.subtract(element)) {
map.erase(it);
}
}
inline void drop(TKey key, LogBufferElement *element) {
iterator it = map.find(key);
if (it != map.end()) {
it->second.drop(element);
}
}
inline iterator begin() { return map.begin(); }
inline const_iterator begin() const { return map.begin(); }
inline iterator end() { return map.end(); }
inline const_iterator end() const { return map.end(); }
std::string format(
const LogStatistics &stat,
uid_t uid,
pid_t pid,
const std::string &name = std::string(""),
log_id_t id = LOG_ID_MAX) const {
static const size_t maximum_sorted_entries = 32;
std::string output;
std::unique_ptr<const TEntry *[]> sorted = sort(uid, pid,
maximum_sorted_entries);
if (!sorted.get()) {
return output;
}
bool headerPrinted = false;
for (size_t index = 0; index < maximum_sorted_entries; ++index) {
const TEntry *entry = sorted[index];
if (!entry) {
break;
}
if (entry->getSizes() <= (sorted[0]->getSizes() / 100)) {
break;
}
if (!headerPrinted) {
output += "\n\n";
output += entry->formatHeader(name, id);
headerPrinted = true;
}
output += entry->format(stat, id);
}
return output;
}
};
namespace EntryBaseConstants {
static constexpr size_t pruned_len = 14;
static constexpr size_t total_len = 80;
}
struct EntryBase {
size_t size;
EntryBase():size(0) { }
explicit EntryBase(LogBufferElement *element):size(element->getMsgLen()) { }
size_t getSizes() const { return size; }
inline void add(LogBufferElement *element) { size += element->getMsgLen(); }
inline bool subtract(LogBufferElement *element) {
size -= element->getMsgLen();
return !size;
}
static std::string formatLine(
const std::string &name,
const std::string &size,
const std::string &pruned) {
ssize_t drop_len = std::max(pruned.length() + 1,
EntryBaseConstants::pruned_len);
ssize_t size_len = std::max(size.length() + 1,
EntryBaseConstants::total_len
- name.length() - drop_len - 1);
if (pruned.length()) {
return android::base::StringPrintf("%s%*s%*s\n", name.c_str(),
(int)size_len, size.c_str(),
(int)drop_len, pruned.c_str());
} else {
return android::base::StringPrintf("%s%*s\n", name.c_str(),
(int)size_len, size.c_str());
}
}
};
struct EntryBaseDropped : public EntryBase {
size_t dropped;
EntryBaseDropped():dropped(0) { }
explicit EntryBaseDropped(LogBufferElement *element):
EntryBase(element),
dropped(element->getDropped()) {
}
size_t getDropped() const { return dropped; }
inline void add(LogBufferElement *element) {
dropped += element->getDropped();
EntryBase::add(element);
}
inline bool subtract(LogBufferElement *element) {
dropped -= element->getDropped();
return EntryBase::subtract(element) && !dropped;
}
inline void drop(LogBufferElement *element) {
dropped += 1;
EntryBase::subtract(element);
}
};
struct UidEntry : public EntryBaseDropped {
const uid_t uid;
pid_t pid;
explicit UidEntry(LogBufferElement *element):
EntryBaseDropped(element),
uid(element->getUid()),
pid(element->getPid()) {
}
inline const uid_t&getKey() const { return uid; }
inline const uid_t&getUid() const { return getKey(); }
inline const pid_t&getPid() const { return pid; }
inline void add(LogBufferElement *element) {
if (pid != element->getPid()) {
pid = -1;
}
EntryBase::add(element);
}
std::string formatHeader(const std::string &name, log_id_t id) const;
std::string format(const LogStatistics &stat, log_id_t id) const;
};
namespace android {
uid_t pidToUid(pid_t pid);
}
struct PidEntry : public EntryBaseDropped {
const pid_t pid;
uid_t uid;
char *name;
explicit PidEntry(pid_t pid):
EntryBaseDropped(),
pid(pid),
uid(android::pidToUid(pid)),
name(android::pidToName(pid)) {
}
explicit PidEntry(LogBufferElement *element):
EntryBaseDropped(element),
pid(element->getPid()),
uid(element->getUid()),
name(android::pidToName(pid)) {
}
PidEntry(const PidEntry &element):
EntryBaseDropped(element),
pid(element.pid),
uid(element.uid),
name(element.name ? strdup(element.name) : NULL) {
}
~PidEntry() { free(name); }
const pid_t&getKey() const { return pid; }
const pid_t&getPid() const { return getKey(); }
const uid_t&getUid() const { return uid; }
const char*getName() const { return name; }
inline void add(pid_t newPid) {
if (name && !fast<strncmp>(name, "zygote", 6)) {
free(name);
name = NULL;
}
if (!name) {
name = android::pidToName(newPid);
}
}
inline void add(LogBufferElement *element) {
uid_t incomingUid = element->getUid();
if (getUid() != incomingUid) {
uid = incomingUid;
free(name);
name = android::pidToName(element->getPid());
} else {
add(element->getPid());
}
EntryBaseDropped::add(element);
}
std::string formatHeader(const std::string &name, log_id_t id) const;
std::string format(const LogStatistics &stat, log_id_t id) const;
};
struct TidEntry : public EntryBaseDropped {
const pid_t tid;
pid_t pid;
uid_t uid;
char *name;
TidEntry(pid_t tid, pid_t pid):
EntryBaseDropped(),
tid(tid),
pid(pid),
uid(android::pidToUid(tid)),
name(android::tidToName(tid)) {
}
explicit TidEntry(LogBufferElement *element):
EntryBaseDropped(element),
tid(element->getTid()),
pid(element->getPid()),
uid(element->getUid()),
name(android::tidToName(tid)) {
}
TidEntry(const TidEntry &element):
EntryBaseDropped(element),
tid(element.tid),
pid(element.pid),
uid(element.uid),
name(element.name ? strdup(element.name) : NULL) {
}
~TidEntry() { free(name); }
const pid_t&getKey() const { return tid; }
const pid_t&getTid() const { return getKey(); }
const pid_t&getPid() const { return pid; }
const uid_t&getUid() const { return uid; }
const char*getName() const { return name; }
inline void add(pid_t incomingTid) {
if (name && !fast<strncmp>(name, "zygote", 6)) {
free(name);
name = NULL;
}
if (!name) {
name = android::tidToName(incomingTid);
}
}
inline void add(LogBufferElement *element) {
uid_t incomingUid = element->getUid();
pid_t incomingPid = element->getPid();
if ((getUid() != incomingUid) || (getPid() != incomingPid)) {
uid = incomingUid;
pid = incomingPid;
free(name);
name = android::tidToName(element->getTid());
} else {
add(element->getTid());
}
EntryBaseDropped::add(element);
}
std::string formatHeader(const std::string &name, log_id_t id) const;
std::string format(const LogStatistics &stat, log_id_t id) const;
};
struct TagEntry : public EntryBaseDropped {
const uint32_t tag;
pid_t pid;
uid_t uid;
explicit TagEntry(LogBufferElement *element):
EntryBaseDropped(element),
tag(element->getTag()),
pid(element->getPid()),
uid(element->getUid()) {
}
const uint32_t&getKey() const { return tag; }
const pid_t&getPid() const { return pid; }
const uid_t&getUid() const { return uid; }
const char*getName() const { return android::tagToName(tag); }
inline void add(LogBufferElement *element) {
if (uid != element->getUid()) {
uid = -1;
}
if (pid != element->getPid()) {
pid = -1;
}
EntryBase::add(element);
}
std::string formatHeader(const std::string &name, log_id_t id) const;
std::string format(const LogStatistics &stat, log_id_t id) const;
};
template <typename TEntry>
class LogFindWorst {
std::unique_ptr<const TEntry *[]> sorted;
public:
explicit LogFindWorst(std::unique_ptr<const TEntry *[]> &&sorted) : sorted(std::move(sorted)) { }
void findWorst(int &worst,
size_t &worst_sizes, size_t &second_worst_sizes,
size_t threshold) {
if (sorted.get() && sorted[0] && sorted[1]) {
worst_sizes = sorted[0]->getSizes();
if ((worst_sizes > threshold)
// Allow time horizon to extend roughly tenfold, assume
// average entry length is 100 characters.
&& (worst_sizes > (10 * sorted[0]->getDropped()))) {
worst = sorted[0]->getKey();
second_worst_sizes = sorted[1]->getSizes();
if (second_worst_sizes < threshold) {
second_worst_sizes = threshold;
}
}
}
}
void findWorst(int &worst,
size_t worst_sizes, size_t &second_worst_sizes) {
if (sorted.get() && sorted[0] && sorted[1]) {
worst = sorted[0]->getKey();
second_worst_sizes = worst_sizes
- sorted[0]->getSizes()
+ sorted[1]->getSizes();
}
}
};
// Log Statistics
class LogStatistics {
friend UidEntry;
size_t mSizes[LOG_ID_MAX];
size_t mElements[LOG_ID_MAX];
size_t mDroppedElements[LOG_ID_MAX];
size_t mSizesTotal[LOG_ID_MAX];
size_t mElementsTotal[LOG_ID_MAX];
bool enable;
// uid to size list
typedef LogHashtable<uid_t, UidEntry> uidTable_t;
uidTable_t uidTable[LOG_ID_MAX];
// pid of system to size list
typedef LogHashtable<pid_t, PidEntry> pidSystemTable_t;
pidSystemTable_t pidSystemTable[LOG_ID_MAX];
// pid to uid list
typedef LogHashtable<pid_t, PidEntry> pidTable_t;
pidTable_t pidTable;
// tid to uid list
typedef LogHashtable<pid_t, TidEntry> tidTable_t;
tidTable_t tidTable;
// tag list
typedef LogHashtable<uint32_t, TagEntry> tagTable_t;
tagTable_t tagTable;
// security tag list
tagTable_t securityTagTable;
public:
LogStatistics();
void enableStatistics() { enable = true; }
void add(LogBufferElement *entry);
void subtract(LogBufferElement *entry);
// entry->setDropped(1) must follow this call
void drop(LogBufferElement *entry);
// Correct for coalescing two entries referencing dropped content
void erase(LogBufferElement *element) {
log_id_t log_id = element->getLogId();
--mElements[log_id];
--mDroppedElements[log_id];
}
LogFindWorst<UidEntry> sort(uid_t uid, pid_t pid, size_t len, log_id id) {
return LogFindWorst<UidEntry>(uidTable[id].sort(uid, pid, len));
}
LogFindWorst<PidEntry> sortPids(uid_t uid, pid_t pid, size_t len, log_id id) {
return LogFindWorst<PidEntry>(pidSystemTable[id].sort(uid, pid, len));
}
LogFindWorst<TagEntry> sortTags(uid_t uid, pid_t pid, size_t len, log_id) {
return LogFindWorst<TagEntry>(tagTable.sort(uid, pid, len));
}
// fast track current value by id only
size_t sizes(log_id_t id) const { return mSizes[id]; }
size_t elements(log_id_t id) const { return mElements[id]; }
size_t realElements(log_id_t id) const {
return mElements[id] - mDroppedElements[id];
}
size_t sizesTotal(log_id_t id) const { return mSizesTotal[id]; }
size_t elementsTotal(log_id_t id) const { return mElementsTotal[id]; }
std::string format(uid_t uid, pid_t pid, unsigned int logMask) const;
// helper (must be locked directly or implicitly by mLogElementsLock)
const char *pidToName(pid_t pid) const;
uid_t pidToUid(pid_t pid);
const char *uidToName(uid_t uid) const;
};
#endif // _LOGD_LOG_STATISTICS_H__