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Sensor Batching Bug fixes.

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i) SensorService dropping events. Increase SOCKET_BUFFER_SIZE in BitTube ctor.
ii) Call flush before every activate.
iii) Emulate flush for older devices. Add a trivial flush complete event when flush is called.

Bug: 10641596
Change-Id: I30d0f3948e830457143f16e157b6ad81908687ce
This commit is contained in:
Aravind Akella 2013-09-05 17:03:38 -07:00
parent 90ed3e8d78
commit 4c8b951f8d
2 changed files with 173 additions and 14 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

161
services/sensorservice/SensorService.cpp
View File

@ -148,6 +148,21 @@ void SensorService::onFirstRef()
// debugging sensor list
mUserSensorListDebug = mSensorList;
mSocketBufferSize = SOCKET_BUFFER_SIZE_NON_BATCHED;
FILE *fp = fopen("/proc/sys/net/core/wmem_max", "r");
char line[128];
if (fp != NULL && fgets(line, sizeof(line), fp) != NULL) {
line[sizeof(line) - 1] = '\0';
sscanf(line, "%u", &mSocketBufferSize);
if (mSocketBufferSize > MAX_SOCKET_BUFFER_SIZE_BATCHED) {
mSocketBufferSize = MAX_SOCKET_BUFFER_SIZE_BATCHED;
}
}
ALOGD("Max socket buffer size %u", mSocketBufferSize);
if (fp) {
fclose(fp);
}
run("SensorService", PRIORITY_URGENT_DISPLAY);
mInitCheck = NO_ERROR;
}
@ -255,7 +270,6 @@ status_t SensorService::dump(int fd, const Vector<String16>& args)
SensorFusion::getInstance().dump(result);
SensorDevice::getInstance().dump(result);
result.appendFormat("%d active connections\n", mActiveConnections.size());
result.append("Active sensors:\n");
for (size_t i=0 ; i<mActiveSensors.size() ; i++) {
int handle = mActiveSensors.keyAt(i);
@ -264,6 +278,17 @@ status_t SensorService::dump(int fd, const Vector<String16>& args)
handle,
mActiveSensors.valueAt(i)->getNumConnections());
}
result.appendFormat("%u Max Socket Buffer size\n", mSocketBufferSize);
result.appendFormat("%d active connections\n", mActiveConnections.size());
for (size_t i=0 ; i < mActiveConnections.size() ; i++) {
sp<SensorEventConnection> connection(mActiveConnections[i].promote());
if (connection != 0) {
result.appendFormat("Connection Number: %d \n", i);
connection->dump(result);
}
}
}
write(fd, result.string(), result.size());
return NO_ERROR;
@ -404,7 +429,6 @@ void SensorService::recordLastValue(
sensors_event_t const * buffer, size_t count)
{
Mutex::Autolock _l(mLock);
// record the last event for each sensor
int32_t prev = buffer[0].sensor;
for (size_t i=1 ; i<count ; i++) {
@ -565,6 +589,15 @@ status_t SensorService::enable(const sp<SensorEventConnection>& connection,
status_t err = sensor->batch(connection.get(), handle, reservedFlags, samplingPeriodNs,
maxBatchReportLatencyNs);
if (err == NO_ERROR) {
connection->setFirstFlushPending(handle, true);
status_t err_flush = sensor->flush(connection.get(), handle);
// Flush may return error if the sensor is not activated or the underlying h/w sensor does
// not support flush.
if (err_flush != NO_ERROR) {
connection->setFirstFlushPending(handle, false);
}
}
if (err == NO_ERROR) {
ALOGD_IF(DEBUG_CONNECTIONS, "Calling activate on %d", handle);
@ -649,6 +682,21 @@ status_t SensorService::flushSensor(const sp<SensorEventConnection>& connection,
if (sensor == NULL) {
return BAD_VALUE;
}
SensorDevice& dev(SensorDevice::getInstance());
if (dev.getHalDeviceVersion() < SENSORS_DEVICE_API_VERSION_1_1) {
// For older devices increment pending flush count, which will send a trivial flush complete
// event for all the connections which are registered for updates on this sensor.
const SortedVector< wp<SensorEventConnection> > activeConnections(
getActiveConnections());
for (size_t i=0 ; i<activeConnections.size() ; i++) {
sp<SensorEventConnection> connection(activeConnections[i].promote());
if (connection != 0) {
connection->incrementPendingFlushCount(handle);
}
}
return NO_ERROR;
}
return sensor->flush(connection.get(), handle);
}
// ---------------------------------------------------------------------------
@ -683,8 +731,15 @@ bool SensorService::SensorRecord::removeConnection(
SensorService::SensorEventConnection::SensorEventConnection(
const sp<SensorService>& service, uid_t uid)
: mService(service), mChannel(new BitTube()), mUid(uid)
: mService(service), mUid(uid)
{
const SensorDevice& device(SensorDevice::getInstance());
if (device.getHalDeviceVersion() >= SENSORS_DEVICE_API_VERSION_1_1) {
// Increase socket buffer size to 1MB for batching capabilities.
mChannel = new BitTube(service->mSocketBufferSize);
} else {
mChannel = new BitTube(SOCKET_BUFFER_SIZE_NON_BATCHED);
}
}
SensorService::SensorEventConnection::~SensorEventConnection()
@ -697,10 +752,22 @@ void SensorService::SensorEventConnection::onFirstRef()
{
}
void SensorService::SensorEventConnection::dump(String8& result) {
Mutex::Autolock _l(mConnectionLock);
for (size_t i = 0; i < mSensorInfo.size(); ++i) {
const FlushInfo& flushInfo = mSensorInfo.valueAt(i);
result.appendFormat("\t %s | status: %s | pending flush events %d\n",
mService->getSensorName(mSensorInfo.keyAt(i)).string(),
flushInfo.mFirstFlushPending ? "First flush pending" :
"active",
flushInfo.mPendingFlushEventsToSend);
}
}
bool SensorService::SensorEventConnection::addSensor(int32_t handle) {
Mutex::Autolock _l(mConnectionLock);
if (mSensorInfo.indexOf(handle) < 0) {
mSensorInfo.add(handle);
if (mSensorInfo.indexOfKey(handle) < 0) {
mSensorInfo.add(handle, FlushInfo());
return true;
}
return false;
@ -708,7 +775,7 @@ bool SensorService::SensorEventConnection::addSensor(int32_t handle) {
bool SensorService::SensorEventConnection::removeSensor(int32_t handle) {
Mutex::Autolock _l(mConnectionLock);
if (mSensorInfo.remove(handle) >= 0) {
if (mSensorInfo.removeItem(handle) >= 0) {
return true;
}
return false;
@ -716,7 +783,7 @@ bool SensorService::SensorEventConnection::removeSensor(int32_t handle) {
bool SensorService::SensorEventConnection::hasSensor(int32_t handle) const {
Mutex::Autolock _l(mConnectionLock);
return mSensorInfo.indexOf(handle) >= 0;
return mSensorInfo.indexOfKey(handle) >= 0;
}
bool SensorService::SensorEventConnection::hasAnySensor() const {
@ -724,12 +791,32 @@ bool SensorService::SensorEventConnection::hasAnySensor() const {
return mSensorInfo.size() ? true : false;
}
void SensorService::SensorEventConnection::setFirstFlushPending(int32_t handle,
bool value) {
Mutex::Autolock _l(mConnectionLock);
ssize_t index = mSensorInfo.indexOfKey(handle);
if (index >= 0) {
FlushInfo& flushInfo = mSensorInfo.editValueAt(index);
flushInfo.mFirstFlushPending = value;
}
}
void SensorService::SensorEventConnection::incrementPendingFlushCount(int32_t handle) {
Mutex::Autolock _l(mConnectionLock);
ssize_t index = mSensorInfo.indexOfKey(handle);
if (index >= 0) {
FlushInfo& flushInfo = mSensorInfo.editValueAt(index);
flushInfo.mPendingFlushEventsToSend++;
}
}
status_t SensorService::SensorEventConnection::sendEvents(
sensors_event_t const* buffer, size_t numEvents,
sensors_event_t* scratch)
{
// filter out events not for this connection
size_t count = 0;
if (scratch) {
Mutex::Autolock _l(mConnectionLock);
size_t i=0;
@ -742,10 +829,18 @@ status_t SensorService::SensorEventConnection::sendEvents(
// filtered correctly. buffer[i].sensor is zero for meta_data events.
curr = buffer[i].meta_data.sensor;
}
if (mSensorInfo.indexOf(curr) >= 0) {
ssize_t index = mSensorInfo.indexOfKey(curr);
if (index >= 0 && mSensorInfo[index].mFirstFlushPending == true &&
buffer[i].type == SENSOR_TYPE_META_DATA) {
// This is the first flush before activate is called. Events can now be sent for
// this sensor on this connection.
ALOGD_IF(DEBUG_CONNECTIONS, "First flush event for sensor==%d ",
buffer[i].meta_data.sensor);
mSensorInfo.editValueAt(index).mFirstFlushPending = false;
}
if (index >= 0 && mSensorInfo[index].mFirstFlushPending == false) {
do {
scratch[count] = buffer[i];
++count; ++i;
scratch[count++] = buffer[i++];
} while ((i<numEvents) && ((buffer[i].sensor == curr) ||
(buffer[i].type == SENSOR_TYPE_META_DATA &&
buffer[i].meta_data.sensor == curr)));
@ -758,19 +853,62 @@ status_t SensorService::SensorEventConnection::sendEvents(
count = numEvents;
}
// Send pending flush events (if any) before sending events from the cache.
{
ASensorEvent flushCompleteEvent;
flushCompleteEvent.type = SENSOR_TYPE_META_DATA;
flushCompleteEvent.sensor = 0;
Mutex::Autolock _l(mConnectionLock);
// Loop through all the sensors for this connection and check if there are any pending
// flush complete events to be sent.
for (size_t i = 0; i < mSensorInfo.size(); ++i) {
FlushInfo& flushInfo = mSensorInfo.editValueAt(i);
while (flushInfo.mPendingFlushEventsToSend > 0) {
flushCompleteEvent.meta_data.sensor = mSensorInfo.keyAt(i);
ssize_t size = SensorEventQueue::write(mChannel, &flushCompleteEvent, 1);
if (size < 0) {
// ALOGW("dropping %d events on the floor", count);
countFlushCompleteEvents(scratch, count);
return size;
}
ALOGD_IF(DEBUG_CONNECTIONS, "sent dropped flush complete event==%d ",
flushCompleteEvent.meta_data.sensor);
flushInfo.mPendingFlushEventsToSend--;
}
}
}
// NOTE: ASensorEvent and sensors_event_t are the same type
ssize_t size = SensorEventQueue::write(mChannel,
reinterpret_cast<ASensorEvent const*>(scratch), count);
if (size == -EAGAIN) {
// the destination doesn't accept events anymore, it's probably
// full. For now, we just drop the events on the floor.
//ALOGW("dropping %d events on the floor", count);
// ALOGW("dropping %d events on the floor", count);
countFlushCompleteEvents(scratch, count);
return size;
}
return size < 0 ? status_t(size) : status_t(NO_ERROR);
}
void SensorService::SensorEventConnection::countFlushCompleteEvents(
sensors_event_t* scratch, const int numEventsDropped) {
ALOGD_IF(DEBUG_CONNECTIONS, "dropping %d events ", numEventsDropped);
Mutex::Autolock _l(mConnectionLock);
// Count flushComplete events in the events that are about to the dropped. These will be sent
// separately before the next batch of events.
for (int j = 0; j < numEventsDropped; ++j) {
if (scratch[j].type == SENSOR_TYPE_META_DATA) {
FlushInfo& flushInfo = mSensorInfo.editValueFor(scratch[j].meta_data.sensor);
flushInfo.mPendingFlushEventsToSend++;
ALOGD_IF(DEBUG_CONNECTIONS, "increment pendingFlushCount %d",
flushInfo.mPendingFlushEventsToSend);
}
}
return;
}
sp<BitTube> SensorService::SensorEventConnection::getSensorChannel() const
{
return mChannel;
@ -799,6 +937,7 @@ status_t SensorService::SensorEventConnection::setEventRate(
status_t SensorService::SensorEventConnection::flushSensor(int handle) {
return mService->flushSensor(this, handle);
}
// ---------------------------------------------------------------------------
}; // namespace android

26
services/sensorservice/SensorService.h
View File

@ -38,6 +38,9 @@
// ---------------------------------------------------------------------------
#define DEBUG_CONNECTIONS false
// Max size is 1 MB which is enough to accept a batch of about 10k events.
#define MAX_SOCKET_BUFFER_SIZE_BATCHED 1024 * 1024
#define SOCKET_BUFFER_SIZE_NON_BATCHED 4 * 1024
struct sensors_poll_device_t;
struct sensors_module_t;
@ -77,14 +80,27 @@ class SensorService :
nsecs_t maxBatchReportLatencyNs, int reservedFlags);
virtual status_t setEventRate(int handle, nsecs_t samplingPeriodNs);
virtual status_t flushSensor(int handle);
// Count the number of flush complete events which are about to be dropped in the buffer.
// Increment mPendingFlushEventsToSend in mSensorInfo. These flush complete events will be
// sent separately before the next batch of events.
void countFlushCompleteEvents(sensors_event_t* scratch, int numEventsDropped);
sp<SensorService> const mService;
sp<BitTube> const mChannel;
sp<BitTube> mChannel;
uid_t mUid;
mutable Mutex mConnectionLock;
// protected by SensorService::mLock
SortedVector<int> mSensorInfo;
struct FlushInfo {
// The number of flush complete events dropped for this sensor is stored here.
// They are sent separately before the next batch of events.
int mPendingFlushEventsToSend;
// Every activate is preceded by a flush. Only after the first flush complete is
// received, the events for the sensor are sent on that *connection*.
bool mFirstFlushPending;
FlushInfo() : mPendingFlushEventsToSend(0), mFirstFlushPending(false) {}
};
// protected by SensorService::mLock. Key for this vector is the sensor handle.
KeyedVector<int, FlushInfo> mSensorInfo;
public:
SensorEventConnection(const sp<SensorService>& service, uid_t uid);
@ -95,6 +111,9 @@ class SensorService :
bool hasAnySensor() const;
bool addSensor(int32_t handle);
bool removeSensor(int32_t handle);
void setFirstFlushPending(int32_t handle, bool value);
void incrementPendingFlushCount(int32_t handle);
void dump(String8& result);
uid_t getUid() const { return mUid; }
};
@ -130,6 +149,7 @@ class SensorService :
DefaultKeyedVector<int, SensorInterface*> mSensorMap;
Vector<SensorInterface *> mVirtualSensorList;
status_t mInitCheck;
size_t mSocketBufferSize;
// protected by mLock
mutable Mutex mLock;