ACPR/android_system_core
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity Actions

Merge "logd: sum liblog tag messages"

Browse source
This commit is contained in:
Treehugger Robot 2016-12-19 23:43:48 +00:00 • committed by Gerrit Code Review
commit 27425fd80d
2 changed files with 84 additions and 23 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

1
logd/Android.mk
View file

@ -40,6 +40,7 @@ LOCAL_SHARED_LIBRARIES := \
# event_flag += $(call event_logtags,logd)
# so make sure we do not regret hard-coding it as follows:
event_flag := -DAUDITD_LOG_TAG=1003 -DCHATTY_LOG_TAG=1004
event_flag += -DLIBLOG_LOG_TAG=1006
LOCAL_CFLAGS := -Werror $(event_flag)

106
logd/LogBuffer.cpp
View file

@ -17,6 +17,7 @@
//#define DEBUG_CHECK_FOR_STALE_ENTRIES
#include <ctype.h>
#include <endian.h>
#include <errno.h>
#include <stdio.h>
#include <string.h>
@ -126,27 +127,41 @@ LogBuffer::~LogBuffer() {
}
}
static bool identical(LogBufferElement* elem, LogBufferElement* last) {
enum match_type {
DIFFERENT,
SAME,
SAME_LIBLOG
};
static enum match_type identical(LogBufferElement* elem, LogBufferElement* last) {
// is it mostly identical?
// if (!elem) return false;
// if (!elem) return DIFFERENT;
unsigned short lenl = elem->getMsgLen();
if (!lenl) return false;
// if (!last) return false;
if (!lenl) return DIFFERENT;
// if (!last) return DIFFERENT;
unsigned short lenr = last->getMsgLen();
if (!lenr) return false;
// if (elem->getLogId() != last->getLogId()) return false;
if (elem->getUid() != last->getUid()) return false;
if (elem->getPid() != last->getPid()) return false;
if (elem->getTid() != last->getTid()) return false;
if (!lenr) return DIFFERENT;
// if (elem->getLogId() != last->getLogId()) return DIFFERENT;
if (elem->getUid() != last->getUid()) return DIFFERENT;
if (elem->getPid() != last->getPid()) return DIFFERENT;
if (elem->getTid() != last->getTid()) return DIFFERENT;
// last is more than a minute old, stop squashing identical messages
if (elem->getRealTime().nsec() >
(last->getRealTime().nsec() + 60 * NS_PER_SEC)) return false;
(last->getRealTime().nsec() + 60 * NS_PER_SEC)) return DIFFERENT;
// Identical message
const char* msgl = elem->getMsg();
const char* msgr = last->getMsg();
if ((lenl == lenr) && !fastcmp<memcmp>(msgl, msgr, lenl)) return true;
if (lenl == lenr) {
if (!fastcmp<memcmp>(msgl, msgr, lenl)) return SAME;
// liblog tagged messages (content gets summed)
if ((elem->getLogId() == LOG_ID_EVENTS) &&
(lenl == sizeof(android_log_event_int_t)) &&
!fastcmp<memcmp>(msgl, msgr,
sizeof(android_log_event_int_t) - sizeof(int32_t)) &&
(elem->getTag() == LIBLOG_LOG_TAG)) return SAME_LIBLOG;
}
// audit message (except sequence number) identical?
static const char avc[] = "): avc: ";
@ -154,20 +169,22 @@ static bool identical(LogBufferElement* elem, LogBufferElement* last) {
if (last->isBinary()) {
if (fastcmp<memcmp>(msgl, msgr,
sizeof(android_log_event_string_t) -
sizeof(int32_t))) return false;
sizeof(int32_t))) return DIFFERENT;
msgl += sizeof(android_log_event_string_t);
lenl -= sizeof(android_log_event_string_t);
msgr += sizeof(android_log_event_string_t);
lenr -= sizeof(android_log_event_string_t);
}
const char *avcl = android::strnstr(msgl, lenl, avc);
if (!avcl) return false;
if (!avcl) return DIFFERENT;
lenl -= avcl - msgl;
const char *avcr = android::strnstr(msgr, lenr, avc);
if (!avcr) return false;
if (!avcr) return DIFFERENT;
lenr -= avcr - msgr;
if (lenl != lenr) return false;
return !fastcmp<memcmp>(avcl + strlen(avc), avcr + strlen(avc), lenl);
if (lenl != lenr) return DIFFERENT;
if (fastcmp<memcmp>(avcl + strlen(avc),
avcr + strlen(avc), lenl)) return DIFFERENT;
return SAME;
}
int LogBuffer::log(log_id_t log_id, log_time realtime,
@ -222,10 +239,10 @@ int LogBuffer::log(log_id_t log_id, log_time realtime,
// dropped = NULL
// currentLast = copy of last message
// elem = incoming message
// outgoing: (if *elem == *currentLast)
// outgoing: if match != DIFFERENT
// dropped = copy of first identical message -> State 1
// currentLast = reference to elem
// break: (if *elem != *currentLast)
// break: if match == DIFFERENT
// dropped = NULL -> State 0
// delete copy of last message (incoming currentLast)
// currentLast = copy of elem
@ -237,12 +254,21 @@ int LogBuffer::log(log_id_t log_id, log_time realtime,
// currentLast = reference to last held-back incoming
// message
// elem = incoming message
// outgoing: (if *elem == *currentLast)
// outgoing: if match == SAME
// delete copy of first identical message (dropped)
// dropped = reference to last held-back incoming
// message set to chatty count of 1 -> State 2
// currentLast = reference to elem
// break:
// outgoing: if match == SAME_LIBLOG
// dropped = copy of first identical message -> State 1
// take sum of currentLast and elem
// if sum overflows:
// log currentLast
// currentLast = reference to elem
// else
// delete currentLast
// currentLast = reference to elem, sum liblog.
// break: if match == DIFFERENT
// delete dropped
// dropped = NULL -> State 0
// log reference to last held-back (currentLast)
@ -256,20 +282,54 @@ int LogBuffer::log(log_id_t log_id, log_time realtime,
// message.
// dropped = chatty message holding count
// elem = incoming message
// outgoing: (if *elem == *currentLast)
// outgoing: if match != DIFFERENT
// delete chatty message holding count
// dropped = reference to last held-back incoming
// message, set to chatty count + 1
// currentLast = reference to elem
// break:
// break: if match == DIFFERENT
// log dropped (chatty message)
// dropped = NULL -> State 0
// log reference to last held-back (currentLast)
// currentLast = copy of elem
// log elem
//
if (identical(elem, currentLast)) {
enum match_type match = identical(elem, currentLast);
if (match != DIFFERENT) {
if (dropped) {
// Sum up liblog tag messages?
if ((count == 0) /* at Pass 1 */ && (match == SAME_LIBLOG)) {
android_log_event_int_t* event =
reinterpret_cast<android_log_event_int_t*>(
const_cast<char*>(currentLast->getMsg()));
//
// To unit test, differentiate with something like:
// event->header.tag = htole32(CHATTY_LOG_TAG);
// here, then instead of delete currentLast below,
// log(currentLast) to see the incremental sums form.
//
uint32_t swab = event->payload.data;
unsigned long long total = htole32(swab);
event = reinterpret_cast<android_log_event_int_t*>(
const_cast<char*>(elem->getMsg()));
swab = event->payload.data;
lastLoggedElements[LOG_ID_EVENTS] = elem;
total += htole32(swab);
// check for overflow
if (total >= UINT32_MAX) {
log(currentLast);
pthread_mutex_unlock(&mLogElementsLock);
return len;
}
stats.add(currentLast);
stats.subtract(currentLast);
delete currentLast;
swab = total;
event->payload.data = htole32(swab);
pthread_mutex_unlock(&mLogElementsLock);
return len;
}
if (count == USHRT_MAX) {
log(dropped);
count = 1;