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android_system_core/logd/LogStatistics.cpp
Mark Salyzyn 8b22c293a0 logd: class hierarcy for Uid and Pid statistics. 
(Cherry pick from commit 81b3eabc49)

Add EntryBase and EntryBaseDropped base classes for statistical
entries to inherit from. Abstract add(), subtract() and drop()
methods to common LogBufferElement in each for entry policy decisions.
Some move of details out of LogStatistics.cpp and place them into
LogStatistics.h. Add statistical add(), subtract() and
drop() methods to hash table to call entries for policy.

Bug: 19608965
Change-Id: Ib8a33a8fe28871ef165d1632c6546a5c606231e8
2015-05-07 10:01:39 -07:00

406 lines
11 KiB
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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.
*/
#include <algorithm> // std::max
#include <fcntl.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <log/logger.h>
#include <private/android_filesystem_config.h>
#include <utils/String8.h>
#include "LogStatistics.h"
LogStatistics::LogStatistics()
: enable(false) {
log_id_for_each(id) {
mSizes[id] = 0;
mElements[id] = 0;
mSizesTotal[id] = 0;
mElementsTotal[id] = 0;
}
}
namespace android {
// caller must own and free character string
char *pidToName(pid_t pid) {
char *retval = NULL;
if (pid == 0) { // special case from auditd for kernel
retval = strdup("logd.auditd");
} else {
char buffer[512];
snprintf(buffer, sizeof(buffer), "/proc/%u/cmdline", pid);
int fd = open(buffer, O_RDONLY);
if (fd >= 0) {
ssize_t ret = read(fd, buffer, sizeof(buffer));
if (ret > 0) {
buffer[sizeof(buffer)-1] = '\0';
// frameworks intermediate state
if (strcmp(buffer, "<pre-initialized>")) {
retval = strdup(buffer);
}
}
close(fd);
}
}
return retval;
}
}
void LogStatistics::add(LogBufferElement *e) {
log_id_t log_id = e->getLogId();
unsigned short size = e->getMsgLen();
mSizes[log_id] += size;
++mElements[log_id];
uidTable[log_id].add(e->getUid(), e);
mSizesTotal[log_id] += size;
++mElementsTotal[log_id];
if (!enable) {
return;
}
pidTable.add(e->getPid(), e);
}
void LogStatistics::subtract(LogBufferElement *e) {
log_id_t log_id = e->getLogId();
unsigned short size = e->getMsgLen();
mSizes[log_id] -= size;
--mElements[log_id];
uidTable[log_id].subtract(e->getUid(), e);
if (!enable) {
return;
}
pidTable.subtract(e->getPid(), e);
}
// Atomically set an entry to drop
// entry->setDropped(1) must follow this call, caller should do this explicitly.
void LogStatistics::drop(LogBufferElement *e) {
log_id_t log_id = e->getLogId();
unsigned short size = e->getMsgLen();
mSizes[log_id] -= size;
uidTable[log_id].drop(e->getUid(), e);
if (!enable) {
return;
}
pidTable.drop(e->getPid(), e);
}
// caller must own and free character string
char *LogStatistics::uidToName(uid_t uid) {
// Local hard coded favourites
if (uid == AID_LOGD) {
return strdup("auditd");
}
// Android hard coded
const struct android_id_info *info = android_ids;
for (size_t i = 0; i < android_id_count; ++i) {
if (info->aid == uid) {
return strdup(info->name);
}
++info;
}
// Parse /data/system/packages.list
char *name = android::uidToName(uid);
if (name) {
return name;
}
// report uid -> pid(s) -> pidToName if unique
ssize_t index = -1;
while ((index = pidTable.next(index)) != -1) {
const PidEntry &entry = pidTable.entryAt(index);
if (entry.getUid() == uid) {
const char *n = entry.getName();
if (n) {
if (!name) {
name = strdup(n);
} else if (strcmp(name, n)) {
free(name);
return NULL;
}
}
}
}
// No one
return name;
}
static void format_line(android::String8 &output,
android::String8 &name, android::String8 &size, android::String8 &pruned) {
static const size_t pruned_len = 6;
static const size_t total_len = 70 + pruned_len;
ssize_t drop_len = std::max(pruned.length() + 1, pruned_len);
ssize_t size_len = std::max(size.length() + 1,
total_len - name.length() - drop_len - 1);
if (pruned.length()) {
output.appendFormat("%s%*s%*s\n", name.string(),
(int)size_len, size.string(),
(int)drop_len, pruned.string());
} else {
output.appendFormat("%s%*s\n", name.string(),
(int)size_len, size.string());
}
}
void LogStatistics::format(char **buf, uid_t uid, unsigned int logMask) {
static const unsigned short spaces_total = 19;
if (*buf) {
free(*buf);
*buf = NULL;
}
// Report on total logging, current and for all time
android::String8 output("size/num");
size_t oldLength;
short spaces = 1;
log_id_for_each(id) {
if (!(logMask & (1 << id))) {
continue;
}
oldLength = output.length();
if (spaces < 0) {
spaces = 0;
}
output.appendFormat("%*s%s", spaces, "", android_log_id_to_name(id));
spaces += spaces_total + oldLength - output.length();
}
spaces = 4;
output.appendFormat("\nTotal");
log_id_for_each(id) {
if (!(logMask & (1 << id))) {
continue;
}
oldLength = output.length();
if (spaces < 0) {
spaces = 0;
}
output.appendFormat("%*s%zu/%zu", spaces, "",
sizesTotal(id), elementsTotal(id));
spaces += spaces_total + oldLength - output.length();
}
spaces = 6;
output.appendFormat("\nNow");
log_id_for_each(id) {
if (!(logMask & (1 << id))) {
continue;
}
size_t els = elements(id);
if (els) {
oldLength = output.length();
if (spaces < 0) {
spaces = 0;
}
output.appendFormat("%*s%zu/%zu", spaces, "", sizes(id), els);
spaces -= output.length() - oldLength;
}
spaces += spaces_total;
}
// Report on Chattiest
// Chattiest by application (UID)
static const size_t maximum_sorted_entries = 32;
log_id_for_each(id) {
if (!(logMask & (1 << id))) {
continue;
}
bool headerPrinted = false;
std::unique_ptr<const UidEntry *[]> sorted = sort(maximum_sorted_entries, id);
ssize_t index = -1;
while ((index = uidTable_t::next(index, sorted, maximum_sorted_entries)) >= 0) {
const UidEntry *entry = sorted[index];
uid_t u = entry->getKey();
if ((uid != AID_ROOT) && (u != uid)) {
continue;
}
if (!headerPrinted) {
output.appendFormat("\n\n");
android::String8 name("");
if (uid == AID_ROOT) {
name.appendFormat(
"Chattiest UIDs in %s log buffer:",
android_log_id_to_name(id));
} else {
name.appendFormat(
"Logging for your UID in %s log buffer:",
android_log_id_to_name(id));
}
android::String8 size("Size");
android::String8 pruned("Pruned");
if (!worstUidEnabledForLogid(id)) {
pruned.setTo("");
}
format_line(output, name, size, pruned);
name.setTo("UID PACKAGE");
size.setTo("BYTES");
pruned.setTo("LINES");
if (!worstUidEnabledForLogid(id)) {
pruned.setTo("");
}
format_line(output, name, size, pruned);
headerPrinted = true;
}
android::String8 name("");
name.appendFormat("%u", u);
char *n = uidToName(u);
if (n) {
name.appendFormat("%*s%s", (int)std::max(6 - name.length(), (size_t)1), "", n);
free(n);
}
android::String8 size("");
size.appendFormat("%zu", entry->getSizes());
android::String8 pruned("");
size_t dropped = entry->getDropped();
if (dropped) {
pruned.appendFormat("%zu", dropped);
}
format_line(output, name, size, pruned);
}
}
if (enable) {
// Pid table
bool headerPrinted = false;
std::unique_ptr<const PidEntry *[]> sorted = pidTable.sort(maximum_sorted_entries);
ssize_t index = -1;
while ((index = pidTable.next(index, sorted, maximum_sorted_entries)) >= 0) {
const PidEntry *entry = sorted[index];
uid_t u = entry->getUid();
if ((uid != AID_ROOT) && (u != uid)) {
continue;
}
if (!headerPrinted) {
output.appendFormat("\n\n");
android::String8 name("");
if (uid == AID_ROOT) {
name.appendFormat("Chattiest PIDs:");
} else {
name.appendFormat("Logging for this PID:");
}
android::String8 size("Size");
android::String8 pruned("Pruned");
format_line(output, name, size, pruned);
name.setTo(" PID/UID COMMAND LINE");
size.setTo("BYTES");
pruned.setTo("LINES");
format_line(output, name, size, pruned);
headerPrinted = true;
}
android::String8 name("");
name.appendFormat("%5u/%u", entry->getKey(), u);
const char *n = entry->getName();
if (n) {
name.appendFormat("%*s%s", (int)std::max(12 - name.length(), (size_t)1), "", n);
} else {
char *un = uidToName(u);
if (un) {
name.appendFormat("%*s%s", (int)std::max(12 - name.length(), (size_t)1), "", un);
free(un);
}
}
android::String8 size("");
size.appendFormat("%zu", entry->getSizes());
android::String8 pruned("");
size_t dropped = entry->getDropped();
if (dropped) {
pruned.appendFormat("%zu", dropped);
}
format_line(output, name, size, pruned);
}
}
*buf = strdup(output.string());
}
namespace android {
uid_t pidToUid(pid_t pid) {
char buffer[512];
snprintf(buffer, sizeof(buffer), "/proc/%u/status", pid);
FILE *fp = fopen(buffer, "r");
if (fp) {
while (fgets(buffer, sizeof(buffer), fp)) {
int uid;
if (sscanf(buffer, "Uid: %d", &uid) == 1) {
fclose(fp);
return uid;
}
}
fclose(fp);
}
return AID_LOGD; // associate this with the logger
}
}
uid_t LogStatistics::pidToUid(pid_t pid) {
return pidTable.entryAt(pidTable.add(pid)).getUid();
}
// caller must free character string
char *LogStatistics::pidToName(pid_t pid) {
const char *name = pidTable.entryAt(pidTable.add(pid)).getName();
if (!name) {
return NULL;
}
return strdup(name);
}
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