platform_system_core/logd/LogStatistics.h

344 lines
9.2 KiB
C++

/*
* 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 <unordered_map>
#include <log/log.h>
#include "LogBufferElement.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))
template <typename TKey, typename TEntry>
class LogHashtable {
std::unordered_map<TKey, TEntry> map;
public:
typedef typename std::unordered_map<TKey, TEntry>::iterator iterator;
std::unique_ptr<const TEntry *[]> sort(size_t n) {
if (!n) {
std::unique_ptr<const TEntry *[]> sorted(NULL);
return sorted;
}
const TEntry **retval = new const TEntry* [n];
memset(retval, 0, sizeof(*retval) * n);
for(iterator it = map.begin(); it != map.end(); ++it) {
const TEntry &entry = it->second;
size_t s = entry.getSizes();
ssize_t i = n - 1;
while ((!retval[i] || (s > retval[i]->getSizes())) && (--i >= 0))
;
if (++i < (ssize_t)n) {
size_t b = n - i - 1;
if (b) {
memmove(&retval[i+1], &retval[i], b * sizeof(retval[0]));
}
retval[i] = &entry;
}
}
std::unique_ptr<const TEntry *[]> sorted(retval);
return sorted;
}
// Iteration handler for the sort method output
static ssize_t next(ssize_t index, std::unique_ptr<const TEntry *[]> &sorted, size_t n) {
++index;
if (!sorted.get() || (index < 0) || (n <= (size_t)index) || !sorted[index]
|| (sorted[index]->getSizes() <= (sorted[0]->getSizes() / 100))) {
return -1;
}
return index;
}
inline iterator add(TKey key, LogBufferElement *e) {
iterator it = map.find(key);
if (it == map.end()) {
it = map.insert(std::make_pair(key, TEntry(e))).first;
} else {
it->second.add(e);
}
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 *e) {
iterator it = map.find(key);
if ((it != map.end()) && it->second.subtract(e)) {
map.erase(it);
}
}
inline void drop(TKey key, LogBufferElement *e) {
iterator it = map.find(key);
if (it != map.end()) {
it->second.drop(e);
}
}
inline iterator begin() { return map.begin(); }
inline iterator end() { return map.end(); }
};
struct EntryBase {
size_t size;
EntryBase():size(0) { }
EntryBase(LogBufferElement *e):size(e->getMsgLen()) { }
size_t getSizes() const { return size; }
inline void add(LogBufferElement *e) { size += e->getMsgLen(); }
inline bool subtract(LogBufferElement *e) { size -= e->getMsgLen(); return !size; }
};
struct EntryBaseDropped : public EntryBase {
size_t dropped;
EntryBaseDropped():dropped(0) { }
EntryBaseDropped(LogBufferElement *e):EntryBase(e),dropped(e->getDropped()){ }
size_t getDropped() const { return dropped; }
inline void add(LogBufferElement *e) {
dropped += e->getDropped();
EntryBase::add(e);
}
inline bool subtract(LogBufferElement *e) {
dropped -= e->getDropped();
return EntryBase::subtract(e) && !dropped;
}
inline void drop(LogBufferElement *e) {
dropped += 1;
EntryBase::subtract(e);
}
};
struct UidEntry : public EntryBaseDropped {
const uid_t uid;
UidEntry(LogBufferElement *e):EntryBaseDropped(e),uid(e->getUid()) { }
inline const uid_t&getKey() const { return uid; }
};
namespace android {
uid_t pidToUid(pid_t pid);
}
struct PidEntry : public EntryBaseDropped {
const pid_t pid;
uid_t uid;
char *name;
PidEntry(pid_t p):
EntryBaseDropped(),
pid(p),
uid(android::pidToUid(p)),
name(android::pidToName(pid)) { }
PidEntry(LogBufferElement *e):
EntryBaseDropped(e),
pid(e->getPid()),
uid(e->getUid()),
name(android::pidToName(e->getPid())) { }
PidEntry(const PidEntry &c):
EntryBaseDropped(c),
pid(c.pid),
uid(c.uid),
name(c.name ? strdup(c.name) : NULL) { }
~PidEntry() { free(name); }
const pid_t&getKey() const { return pid; }
const uid_t&getUid() const { return uid; }
const char*getName() const { return name; }
inline void add(pid_t p) {
if (name && !strncmp(name, "zygote", 6)) {
free(name);
name = NULL;
}
if (!name) {
char *n = android::pidToName(p);
if (n) {
name = n;
}
}
}
inline void add(LogBufferElement *e) {
uid_t u = e->getUid();
if (getUid() != u) {
uid = u;
free(name);
name = android::pidToName(e->getPid());
} else {
add(e->getPid());
}
EntryBaseDropped::add(e);
}
};
struct TidEntry : public EntryBaseDropped {
const pid_t tid;
uid_t uid;
char *name;
TidEntry(pid_t t):
EntryBaseDropped(),
tid(t),
uid(android::pidToUid(t)),
name(android::tidToName(tid)) { }
TidEntry(LogBufferElement *e):
EntryBaseDropped(e),
tid(e->getTid()),
uid(e->getUid()),
name(android::tidToName(e->getTid())) { }
TidEntry(const TidEntry &c):
EntryBaseDropped(c),
tid(c.tid),
uid(c.uid),
name(c.name ? strdup(c.name) : NULL) { }
~TidEntry() { free(name); }
const pid_t&getKey() const { return tid; }
const uid_t&getUid() const { return uid; }
const char*getName() const { return name; }
inline void add(pid_t t) {
if (name && !strncmp(name, "zygote", 6)) {
free(name);
name = NULL;
}
if (!name) {
char *n = android::tidToName(t);
if (n) {
name = n;
}
}
}
inline void add(LogBufferElement *e) {
uid_t u = e->getUid();
if (getUid() != u) {
uid = u;
free(name);
name = android::tidToName(e->getTid());
} else {
add(e->getTid());
}
EntryBaseDropped::add(e);
}
};
struct TagEntry : public EntryBase {
const uint32_t tag;
uid_t uid;
TagEntry(LogBufferElement *e):
EntryBase(e),
tag(e->getTag()),
uid(e->getUid()) { }
const uint32_t&getKey() const { return tag; }
const uid_t&getUid() const { return uid; }
const char*getName() const { return android::tagToName(tag); }
inline void add(LogBufferElement *e) {
uid_t u = e->getUid();
if (uid != u) {
uid = -1;
}
EntryBase::add(e);
}
};
// Log Statistics
class LogStatistics {
size_t mSizes[LOG_ID_MAX];
size_t mElements[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 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;
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 merging two entries referencing dropped content
void erase(LogBufferElement *e) { --mElements[e->getLogId()]; }
std::unique_ptr<const UidEntry *[]> sort(size_t n, log_id i) { return uidTable[i].sort(n); }
// 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 sizesTotal(log_id_t id) const { return mSizesTotal[id]; }
size_t elementsTotal(log_id_t id) const { return mElementsTotal[id]; }
// *strp = malloc, balance with free
void format(char **strp, uid_t uid, unsigned int logMask);
// helper
char *pidToName(pid_t pid);
uid_t pidToUid(pid_t pid);
char *uidToName(uid_t uid);
};
#endif // _LOGD_LOG_STATISTICS_H__