Merge "Log CPU usage"

    libdl

LOCAL_STATIC_LIBRARIES := \

    libcpustats \

    libmedia_helper

LOCAL_MODULE:= libaudioflinger

#include <media/EffectsFactoryApi.h>

#include <audio_effects/effect_visualizer.h>

#include <cpustats/ThreadCpuUsage.h>

// #define DEBUG_CPU_USAGE 10  // log statistics every n wall clock seconds

// ----------------------------------------------------------------------------

    uint32_t idleSleepTime = idleSleepTimeUs();

    uint32_t sleepTime = idleSleepTime;

    Vector< sp<EffectChain> > effectChains;

#ifdef DEBUG_CPU_USAGE

    ThreadCpuUsage cpu;

    const CentralTendencyStatistics& stats = cpu.statistics();

#endif

    while (!exitPending())

    {

#ifdef DEBUG_CPU_USAGE

        cpu.sampleAndEnable();

        unsigned n = stats.n();

        // cpu.elapsed() is expensive, so don't call it every loop

        if ((n & 127) == 1) {

            long long elapsed = cpu.elapsed();

            if (elapsed >= DEBUG_CPU_USAGE * 1000000000LL) {

                double perLoop = elapsed / (double) n;

                double perLoop100 = perLoop * 0.01;

                double mean = stats.mean();

                double stddev = stats.stddev();

                double minimum = stats.minimum();

                double maximum = stats.maximum();

                cpu.resetStatistics();

                LOGI("CPU usage over past %.1f secs (%u mixer loops at %.1f mean ms per loop):\n  us per mix loop: mean=%.0f stddev=%.0f min=%.0f max=%.0f\n  %% of wall: mean=%.1f stddev=%.1f min=%.1f max=%.1f",

                        elapsed * .000000001, n, perLoop * .000001,

                        mean * .001,

                        stddev * .001,

                        minimum * .001,

                        maximum * .001,

                        mean / perLoop100,

                        stddev / perLoop100,

                        minimum / perLoop100,

                        maximum / perLoop100);

            }

        }

#endif

        processConfigEvents();

        mixerStatus = MIXER_IDLE;