logd: Add minimum time bucket statistics
* Only enabled for dev builds because halves performance.
- Used to establish if /proc/sys/net/unix/max_dgram_qlen
is appropriate for the platform
(see logd/LogStatistics.cpp comments)
- enabled if logd.dgram_qlen.statistics is not zero/empty
Change-Id: Ib8ecfeb75b6f0f954c099a6b1032b8afb5efcbd4
diff --git a/logd/LogBuffer.cpp b/logd/LogBuffer.cpp
index 1c5cef0..aa44264 100644
--- a/logd/LogBuffer.cpp
+++ b/logd/LogBuffer.cpp
@@ -37,11 +37,11 @@
LogBuffer::LogBuffer(LastLogTimes *times)
: mTimes(*times) {
pthread_mutex_init(&mLogElementsLock, NULL);
-#ifdef USERDEBUG_BUILD
+ dgram_qlen_statistics = false;
+
log_id_for_each(i) {
mMaxSize[i] = LOG_BUFFER_SIZE;
}
-#endif
}
void LogBuffer::log(log_id_t log_id, log_time realtime,
@@ -61,6 +61,23 @@
LogBufferElementCollection::iterator last = it;
while (--it != mLogElements.begin()) {
if ((*it)->getRealTime() <= realtime) {
+ // halves the peak performance, use with caution
+ if (dgram_qlen_statistics) {
+ LogBufferElementCollection::iterator ib = it;
+ unsigned short buckets, num = 1;
+ for (unsigned short i = 0; (buckets = stats.dgram_qlen(i)); ++i) {
+ buckets -= num;
+ num += buckets;
+ while (buckets && (--ib != mLogElements.begin())) {
+ --buckets;
+ }
+ if (buckets) {
+ break;
+ }
+ stats.recordDiff(
+ elem->getRealTime() - (*ib)->getRealTime(), i);
+ }
+ }
break;
}
last = it;