CameraService: Use SCHED_FIFO for request queue thread in HFR
- Move SchedulingPolicyService from audioservice to mediautils
- When starting up a high speed stream config, set request queue thread
to SCHED_FIFO using SchedulingPolicyService
Bug: 24227252
Change-Id: I224b59142bd111caf563779f55cddd62385b9bac
diff --git a/services/camera/libcameraservice/device3/Camera3Device.cpp b/services/camera/libcameraservice/device3/Camera3Device.cpp
index 433a745..1a3a770 100644
--- a/services/camera/libcameraservice/device3/Camera3Device.cpp
+++ b/services/camera/libcameraservice/device3/Camera3Device.cpp
@@ -44,6 +44,7 @@
#include <utils/Timers.h>
#include "utils/CameraTraces.h"
+#include "mediautils/SchedulingPolicyService.h"
#include "device3/Camera3Device.h"
#include "device3/Camera3OutputStream.h"
#include "device3/Camera3InputStream.h"
@@ -1766,6 +1767,21 @@
// across configure_streams() calls
mRequestThread->configurationComplete();
+ // Boost priority of request thread for high speed recording to SCHED_FIFO
+ if (mIsConstrainedHighSpeedConfiguration) {
+ pid_t requestThreadTid = mRequestThread->getTid();
+ res = requestPriority(getpid(), requestThreadTid,
+ kConstrainedHighSpeedThreadPriority, true);
+ if (res != OK) {
+ ALOGW("Can't set realtime priority for request processing thread: %s (%d)",
+ strerror(-res), res);
+ } else {
+ ALOGD("Set real time priority for request queue thread (tid %d)", requestThreadTid);
+ }
+ } else {
+ // TODO: Set/restore normal priority for normal use cases
+ }
+
// Update device state
mNeedConfig = false;
diff --git a/services/camera/libcameraservice/device3/Camera3Device.h b/services/camera/libcameraservice/device3/Camera3Device.h
index 9d3c533..402cb1d 100644
--- a/services/camera/libcameraservice/device3/Camera3Device.h
+++ b/services/camera/libcameraservice/device3/Camera3Device.h
@@ -161,6 +161,8 @@
static const nsecs_t kActiveTimeout = 500000000; // 500 ms
static const size_t kInFlightWarnLimit = 20;
static const size_t kInFlightWarnLimitHighSpeed = 256; // batch size 32 * pipe depth 8
+ // SCHED_FIFO priority for request submission thread in HFR mode
+ static const int kConstrainedHighSpeedThreadPriority = 3;
struct RequestTrigger;
// minimal jpeg buffer size: 256KB + blob header