Merge "PlaybackThread: Request real-time priority on ARC" into main

static const int kPriorityAudioApp = 2;

static const int kPriorityFastMixer = 3;

static const int kPriorityFastCapture = 3;

// Request real-time priority for PlaybackThread in ARC

static const int kPriorityPlaybackThreadArc = 1;

// IAudioFlinger::createTrack() has an in/out parameter 'pFrameCount' for the total size of the

// track buffer in shared memory.  Zero on input means to use a default value.  For fast tracks,

                stream()->setHalThreadPriority(priorityBoost);

            }

        }

    } else if (property_get_bool("ro.boot.container", false /* default_value */)) {

        // In ARC experiments (b/73091832), the latency under using CFS scheduler with any priority

        // is not enough for PlaybackThread to process audio data in time. We request the lowest

        // real-time priority, SCHED_FIFO=1, for PlaybackThread in ARC. ro.boot.container is true

        // only on ARC.

        const pid_t tid = getTid();

        if (tid == -1) {

            ALOGW("%s: Cannot update PlaybackThread priority for ARC, no tid", __func__);

        } else {

            const status_t status = requestPriority(getpid(),

                                                    tid,

                                                    kPriorityPlaybackThreadArc,

                                                    false /* isForApp */,

                                                    true /* asynchronous */);

            if (status != OK) {

                ALOGW("%s: Cannot update PlaybackThread priority for ARC, status %d", __func__,

                        status);

            } else {

                stream()->setHalThreadPriority(kPriorityPlaybackThreadArc);

            }

        }

    }

    Vector<sp<IAfTrack>> tracksToRemove;