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Commit d03d5c93 authored by Martijn Coenen's avatar Martijn Coenen Committed by Automerger Merge Worker
Browse files

Merge "Repeat proxy limit callbacks if we keep going above the limit." am:... 

Merge "Repeat proxy limit callbacks if we keep going above the limit." am: c8600dc1 am: 8ffa7ecf am: f5652cf8

Original change: https://android-review.googlesource.com/c/platform/frameworks/native/+/1818234

Change-Id: I94d535f03515d43ae37477ff878d42122fa46013
parents 0db52704 f5652cf8

libs/binder/BpBinder.cpp

+20 −2
Original line number Diff line number Diff line
@@ -37,6 +37,7 @@ namespace android { 


Mutex BpBinder::sTrackingLock;

std::unordered_map<int32_t, uint32_t> BpBinder::sTrackingMap;

std::unordered_map<int32_t, uint32_t> BpBinder::sLastLimitCallbackMap;

int BpBinder::sNumTrackedUids = 0;

std::atomic_bool BpBinder::sCountByUidEnabled(false);

binder_proxy_limit_callback BpBinder::sLimitCallback;
@@ -47,6 +48,10 @@ uint32_t BpBinder::sBinderProxyCountHighWatermark = 2500; 
// Another arbitrary value a binder count needs to drop below before another callback will be called

uint32_t BpBinder::sBinderProxyCountLowWatermark = 2000;



// Once the limit has been exceeded, keep calling the limit callback for every this many new proxies

// created over the limit.

constexpr uint32_t REPEAT_LIMIT_CALLBACK_INTERVAL = 1000;



enum {

    LIMIT_REACHED_MASK = 0x80000000,        // A flag denoting that the limit has been reached

    COUNTING_VALUE_MASK = 0x7FFFFFFF,       // A mask of the remaining bits for the count value
@@ -120,12 +125,24 @@ sp<BpBinder> BpBinder::create(int32_t handle) { 
            if (sBinderProxyThrottleCreate) {

                return nullptr;

            }

            trackedValue = trackedValue & COUNTING_VALUE_MASK;

            uint32_t lastLimitCallbackAt = sLastLimitCallbackMap[trackedUid];



            if (trackedValue > lastLimitCallbackAt &&

                (trackedValue - lastLimitCallbackAt > REPEAT_LIMIT_CALLBACK_INTERVAL)) {

                ALOGE("Still too many binder proxy objects sent to uid %d from uid %d (%d proxies "

                      "held)",

                      getuid(), trackedUid, trackedValue);

                if (sLimitCallback) sLimitCallback(trackedUid);

                sLastLimitCallbackMap[trackedUid] = trackedValue;

            }

        } else {

            if ((trackedValue & COUNTING_VALUE_MASK) >= sBinderProxyCountHighWatermark) {

                ALOGE("Too many binder proxy objects sent to uid %d from uid %d (%d proxies held)",

                      getuid(), trackedUid, trackedValue);

                sTrackingMap[trackedUid] |= LIMIT_REACHED_MASK;

                if (sLimitCallback) sLimitCallback(trackedUid);

                sLastLimitCallbackMap[trackedUid] = trackedValue & COUNTING_VALUE_MASK;

                if (sBinderProxyThrottleCreate) {

                    ALOGI("Throttling binder proxy creates from uid %d in uid %d until binder proxy"

                          " count drops below %d",
@@ -465,8 +482,9 @@ BpBinder::~BpBinder() 
                ((trackedValue & COUNTING_VALUE_MASK) <= sBinderProxyCountLowWatermark)

                )) {

                ALOGI("Limit reached bit reset for uid %d (fewer than %d proxies from uid %d held)",

                                   getuid(), mTrackedUid, sBinderProxyCountLowWatermark);

                      getuid(), sBinderProxyCountLowWatermark, mTrackedUid);

                sTrackingMap[mTrackedUid] &= ~LIMIT_REACHED_MASK;

                sLastLimitCallbackMap.erase(mTrackedUid);

            }

            if (--sTrackingMap[mTrackedUid] == 0) {

                sTrackingMap.erase(mTrackedUid);

libs/binder/include/binder/BpBinder.h

+1 −0
Original line number Diff line number Diff line
@@ -194,6 +194,7 @@ private: 
    static uint32_t                             sBinderProxyCountHighWatermark;

    static uint32_t                             sBinderProxyCountLowWatermark;

    static bool                                 sBinderProxyThrottleCreate;

    static std::unordered_map<int32_t,uint32_t> sLastLimitCallbackMap;

};



} // namespace android