Improve TrafficStats UID APIs.

Deprecate transport layer statistics, leaving only the summarized
network layer statistics.

Improve documentation to be clear about layers where measurements
occur, and their behavior since boot.  Under the hood, move to using
xt_qtaguid UID statistics.

Bug: 6818637, 7013662
Change-Id: I9f26992e5fcdebd88c671e5765bd91229e7b0016

4 files changed, 199 insertions, 305 deletions

diff --git a/api/current.txt b/api/current.txt
index 0569b9d..fcbe24f 100644
--- a/api/current.txt
+++ b/api/current.txt
@@ -12805,16 +12805,16 @@ package android.net {
     method public static long getTotalTxPackets();
     method public static long getUidRxBytes(int);
     method public static long getUidRxPackets(int);
-    method public static long getUidTcpRxBytes(int);
-    method public static long getUidTcpRxSegments(int);
-    method public static long getUidTcpTxBytes(int);
-    method public static long getUidTcpTxSegments(int);
+    method public static deprecated long getUidTcpRxBytes(int);
+    method public static deprecated long getUidTcpRxSegments(int);
+    method public static deprecated long getUidTcpTxBytes(int);
+    method public static deprecated long getUidTcpTxSegments(int);
     method public static long getUidTxBytes(int);
     method public static long getUidTxPackets(int);
-    method public static long getUidUdpRxBytes(int);
-    method public static long getUidUdpRxPackets(int);
-    method public static long getUidUdpTxBytes(int);
-    method public static long getUidUdpTxPackets(int);
+    method public static deprecated long getUidUdpRxBytes(int);
+    method public static deprecated long getUidUdpRxPackets(int);
+    method public static deprecated long getUidUdpTxBytes(int);
+    method public static deprecated long getUidUdpTxPackets(int);
     method public static void incrementOperationCount(int);
     method public static void incrementOperationCount(int, int);
     method public static void setThreadStatsTag(int);
diff --git a/core/java/android/net/TrafficStats.java b/core/java/android/net/TrafficStats.java
index a014cec..a282910 100644
--- a/core/java/android/net/TrafficStats.java
+++ b/core/java/android/net/TrafficStats.java
@@ -424,161 +424,156 @@ public class TrafficStats {
     }
 
     /**
-     * Get the number of bytes sent through the network for this UID.
-     * The statistics are across all interfaces.
-     *
-     * {@see android.os.Process#myUid()}.
+     * Return number of bytes transmitted by the given UID since device boot.
+     * Counts packets across all network interfaces, and always increases
+     * monotonically since device boot. Statistics are measured at the network
+     * layer, so they include both TCP and UDP usage.
+     * <p>
+     * Before {@link android.os.Build.VERSION_CODES#K}, this may return
+     * {@link #UNSUPPORTED} on devices where statistics aren't available.
      *
-     * @param uid The UID of the process to examine.
-     * @return number of bytes.  If the statistics are not supported by this device,
-     * {@link #UNSUPPORTED} will be returned.
+     * @see android.os.Process#myUid()
+     * @see android.content.pm.ApplicationInfo#uid
      */
-    public static native long getUidTxBytes(int uid);
+    public static long getUidTxBytes(int uid) {
+        return nativeGetUidStat(uid, TYPE_TX_BYTES);
+    }
 
     /**
-     * Get the number of bytes received through the network for this UID.
-     * The statistics are across all interfaces.
-     *
-     * {@see android.os.Process#myUid()}.
+     * Return number of bytes received by the given UID since device boot.
+     * Counts packets across all network interfaces, and always increases
+     * monotonically since device boot. Statistics are measured at the network
+     * layer, so they include both TCP and UDP usage.
+     * <p>
+     * Before {@link android.os.Build.VERSION_CODES#K}, this may return
+     * {@link #UNSUPPORTED} on devices where statistics aren't available.
      *
-     * @param uid The UID of the process to examine.
-     * @return number of bytes
+     * @see android.os.Process#myUid()
+     * @see android.content.pm.ApplicationInfo#uid
      */
-    public static native long getUidRxBytes(int uid);
+    public static long getUidRxBytes(int uid) {
+        return nativeGetUidStat(uid, TYPE_RX_BYTES);
+    }
 
     /**
-     * Get the number of packets (TCP segments + UDP) sent through
-     * the network for this UID.
-     * The statistics are across all interfaces.
-     *
-     * {@see android.os.Process#myUid()}.
+     * Return number of packets transmitted by the given UID since device boot.
+     * Counts packets across all network interfaces, and always increases
+     * monotonically since device boot. Statistics are measured at the network
+     * layer, so they include both TCP and UDP usage.
+     * <p>
+     * Before {@link android.os.Build.VERSION_CODES#K}, this may return
+     * {@link #UNSUPPORTED} on devices where statistics aren't available.
      *
-     * @param uid The UID of the process to examine.
-     * @return number of packets.
-     * If the statistics are not supported by this device,
-     * {@link #UNSUPPORTED} will be returned.
+     * @see android.os.Process#myUid()
+     * @see android.content.pm.ApplicationInfo#uid
      */
-    public static native long getUidTxPackets(int uid);
+    public static long getUidTxPackets(int uid) {
+        return nativeGetUidStat(uid, TYPE_TX_PACKETS);
+    }
 
     /**
-     * Get the number of packets (TCP segments + UDP) received through
-     * the network for this UID.
-     * The statistics are across all interfaces.
-     *
-     * {@see android.os.Process#myUid()}.
+     * Return number of packets received by the given UID since device boot.
+     * Counts packets across all network interfaces, and always increases
+     * monotonically since device boot. Statistics are measured at the network
+     * layer, so they include both TCP and UDP usage.
+     * <p>
+     * Before {@link android.os.Build.VERSION_CODES#K}, this may return
+     * {@link #UNSUPPORTED} on devices where statistics aren't available.
      *
-     * @param uid The UID of the process to examine.
-     * @return number of packets
+     * @see android.os.Process#myUid()
+     * @see android.content.pm.ApplicationInfo#uid
      */
-    public static native long getUidRxPackets(int uid);
+    public static long getUidRxPackets(int uid) {
+        return nativeGetUidStat(uid, TYPE_RX_PACKETS);
+    }
 
     /**
-     * Get the number of TCP payload bytes sent for this UID.
-     * This total does not include protocol and control overheads at
-     * the transport and the lower layers of the networking stack.
-     * The statistics are across all interfaces.
-     *
-     * {@see android.os.Process#myUid()}.
-     *
-     * @param uid The UID of the process to examine.
-     * @return number of bytes.  If the statistics are not supported by this device,
-     * {@link #UNSUPPORTED} will be returned.
+     * @deprecated Starting in {@link android.os.Build.VERSION_CODES#K},
+     *             transport layer statistics are no longer available, and will
+     *             always return {@link #UNSUPPORTED}.
+     * @see #getUidTxBytes(int)
      */
-    public static native long getUidTcpTxBytes(int uid);
+    @Deprecated
+    public static long getUidTcpTxBytes(int uid) {
+        return UNSUPPORTED;
+    }
 
     /**
-     * Get the number of TCP payload bytes received for this UID.
-     * This total does not include protocol and control overheads at
-     * the transport and the lower layers of the networking stack.
-     * The statistics are across all interfaces.
-     *
-     * {@see android.os.Process#myUid()}.
-     *
-     * @param uid The UID of the process to examine.
-     * @return number of bytes.  If the statistics are not supported by this device,
-     * {@link #UNSUPPORTED} will be returned.
+     * @deprecated Starting in {@link android.os.Build.VERSION_CODES#K},
+     *             transport layer statistics are no longer available, and will
+     *             always return {@link #UNSUPPORTED}.
+     * @see #getUidRxBytes(int)
      */
-    public static native long getUidTcpRxBytes(int uid);
+    @Deprecated
+    public static long getUidTcpRxBytes(int uid) {
+        return UNSUPPORTED;
+    }
 
     /**
-     * Get the number of UDP payload bytes sent for this UID.
-     * This total does not include protocol and control overheads at
-     * the transport and the lower layers of the networking stack.
-     * The statistics are across all interfaces.
-     *
-     * {@see android.os.Process#myUid()}.
-     *
-     * @param uid The UID of the process to examine.
-     * @return number of bytes.  If the statistics are not supported by this device,
-     * {@link #UNSUPPORTED} will be returned.
+     * @deprecated Starting in {@link android.os.Build.VERSION_CODES#K},
+     *             transport layer statistics are no longer available, and will
+     *             always return {@link #UNSUPPORTED}.
+     * @see #getUidTxBytes(int)
      */
-    public static native long getUidUdpTxBytes(int uid);
+    @Deprecated
+    public static long getUidUdpTxBytes(int uid) {
+        return UNSUPPORTED;
+    }
 
     /**
-     * Get the number of UDP payload bytes received for this UID.
-     * This total does not include protocol and control overheads at
-     * the transport and the lower layers of the networking stack.
-     * The statistics are across all interfaces.
-     *
-     * {@see android.os.Process#myUid()}.
-     *
-     * @param uid The UID of the process to examine.
-     * @return number of bytes.  If the statistics are not supported by this device,
-     * {@link #UNSUPPORTED} will be returned.
+     * @deprecated Starting in {@link android.os.Build.VERSION_CODES#K},
+     *             transport layer statistics are no longer available, and will
+     *             always return {@link #UNSUPPORTED}.
+     * @see #getUidRxBytes(int)
      */
-    public static native long getUidUdpRxBytes(int uid);
+    @Deprecated
+    public static long getUidUdpRxBytes(int uid) {
+        return UNSUPPORTED;
+    }
 
     /**
-     * Get the number of TCP segments sent for this UID.
-     * Does not include TCP control packets (SYN/ACKs/FIN/..).
-     * The statistics are across all interfaces.
-     *
-     * {@see android.os.Process#myUid()}.
-     *
-     * @param uid The UID of the process to examine.
-     * @return number of TCP segments.  If the statistics are not supported by this device,
-     * {@link #UNSUPPORTED} will be returned.
+     * @deprecated Starting in {@link android.os.Build.VERSION_CODES#K},
+     *             transport layer statistics are no longer available, and will
+     *             always return {@link #UNSUPPORTED}.
+     * @see #getUidTxPackets(int)
      */
-    public static native long getUidTcpTxSegments(int uid);
+    @Deprecated
+    public static long getUidTcpTxSegments(int uid) {
+        return UNSUPPORTED;
+    }
 
     /**
-     * Get the number of TCP segments received for this UID.
-     * Does not include TCP control packets (SYN/ACKs/FIN/..).
-     * The statistics are across all interfaces.
-     *
-     * {@see android.os.Process#myUid()}.
-     *
-     * @param uid The UID of the process to examine.
-     * @return number of TCP segments.  If the statistics are not supported by this device,
-     * {@link #UNSUPPORTED} will be returned.
+     * @deprecated Starting in {@link android.os.Build.VERSION_CODES#K},
+     *             transport layer statistics are no longer available, and will
+     *             always return {@link #UNSUPPORTED}.
+     * @see #getUidRxPackets(int)
      */
-    public static native long getUidTcpRxSegments(int uid);
+    @Deprecated
+    public static long getUidTcpRxSegments(int uid) {
+        return UNSUPPORTED;
+    }
 
     /**
-     * Get the number of UDP packets sent for this UID.
-     * Includes DNS requests.
-     * The statistics are across all interfaces.
-     *
-     * {@see android.os.Process#myUid()}.
-     *
-     * @param uid The UID of the process to examine.
-     * @return number of packets.  If the statistics are not supported by this device,
-     * {@link #UNSUPPORTED} will be returned.
+     * @deprecated Starting in {@link android.os.Build.VERSION_CODES#K},
+     *             transport layer statistics are no longer available, and will
+     *             always return {@link #UNSUPPORTED}.
+     * @see #getUidTxPackets(int)
      */
-    public static native long getUidUdpTxPackets(int uid);
+    @Deprecated
+    public static long getUidUdpTxPackets(int uid) {
+        return UNSUPPORTED;
+    }
 
     /**
-     * Get the number of UDP packets received for this UID.
-     * Includes DNS responses.
-     * The statistics are across all interfaces.
-     *
-     * {@see android.os.Process#myUid()}.
-     *
-     * @param uid The UID of the process to examine.
-     * @return number of packets.  If the statistics are not supported by this device,
-     * {@link #UNSUPPORTED} will be returned.
+     * @deprecated Starting in {@link android.os.Build.VERSION_CODES#K},
+     *             transport layer statistics are no longer available, and will
+     *             always return {@link #UNSUPPORTED}.
+     * @see #getUidRxPackets(int)
      */
-    public static native long getUidUdpRxPackets(int uid);
+    @Deprecated
+    public static long getUidUdpRxPackets(int uid) {
+        return UNSUPPORTED;
+    }
 
     /**
      * Return detailed {@link NetworkStats} for the current UID. Requires no
@@ -616,4 +611,5 @@ public class TrafficStats {
 
     private static native long nativeGetTotalStat(int type);
     private static native long nativeGetIfaceStat(String iface, int type);
+    private static native long nativeGetUidStat(int uid, int type);
 }
diff --git a/core/jni/android_net_TrafficStats.cpp b/core/jni/android_net_TrafficStats.cpp
index aa8a58b..bf963de 100644
--- a/core/jni/android_net_TrafficStats.cpp
+++ b/core/jni/android_net_TrafficStats.cpp
@@ -32,17 +32,7 @@
 namespace android {
 
 static const char* QTAGUID_IFACE_STATS = "/proc/net/xt_qtaguid/iface_stat_fmt";
-
-enum Tx_Rx {
-    TX,
-    RX
-};
-
-enum Tcp_Udp {
-    TCP,
-    UDP,
-    TCP_AND_UDP
-};
+static const char* QTAGUID_UID_STATS = "/proc/net/xt_qtaguid/stats";
 
 // NOTE: keep these in sync with TrafficStats.java
 static const uint64_t UNKNOWN = -1;
@@ -84,27 +74,6 @@ static uint64_t getStatsType(struct Stats* stats, StatsType type) {
     }
 }
 
-// Returns an ASCII decimal number read from the specified file, -1 on error.
-static jlong readNumber(char const* filename) {
-    char buf[80];
-    int fd = open(filename, O_RDONLY);
-    if (fd < 0) {
-        if (errno != ENOENT) ALOGE("Can't open %s: %s", filename, strerror(errno));
-        return -1;
-    }
-
-    int len = read(fd, buf, sizeof(buf) - 1);
-    if (len < 0) {
-        ALOGE("Can't read %s: %s", filename, strerror(errno));
-        close(fd);
-        return -1;
-    }
-
-    close(fd);
-    buf[len] = '\0';
-    return atoll(buf);
-}
-
 static int parseIfaceStats(const char* iface, struct Stats* stats) {
     FILE *fp = fopen(QTAGUID_IFACE_STATS, "r");
     if (fp == NULL) {
@@ -149,6 +118,36 @@ static int parseIfaceStats(const char* iface, struct Stats* stats) {
     return 0;
 }
 
+static int parseUidStats(const uint32_t uid, struct Stats* stats) {
+    FILE *fp = fopen(QTAGUID_UID_STATS, "r");
+    if (fp == NULL) {
+        return -1;
+    }
+
+    char buffer[256];
+    char iface[32];
+    uint32_t idx, cur_uid, set;
+    uint64_t tag, rxBytes, rxPackets, txBytes, txPackets;
+
+    while (fgets(buffer, 256, fp) != NULL) {
+        if (sscanf(buffer, "%d %31s 0x%llx %u %u %llu %llu %llu %llu", &idx,
+                iface, &tag, &cur_uid, &set, &rxBytes, &rxPackets, &txBytes,
+                &txPackets) == 9) {
+            if (uid == cur_uid && tag == 0L) {
+                stats->rxBytes += rxBytes;
+                stats->rxPackets += rxPackets;
+                stats->txBytes += txBytes;
+                stats->txPackets += txPackets;
+            }
+        }
+    }
+
+    if (fclose(fp) != 0) {
+        return -1;
+    }
+    return 0;
+}
+
 static jlong getTotalStat(JNIEnv* env, jclass clazz, jint type) {
     struct Stats stats;
     memset(&stats, 0, sizeof(Stats));
@@ -174,160 +173,20 @@ static jlong getIfaceStat(JNIEnv* env, jclass clazz, jstring iface, jint type) {
     }
 }
 
-
-// Per-UID stats require reading from a constructed filename.
-
-static jlong getUidBytes(JNIEnv* env, jobject clazz, jint uid,
-                         enum Tx_Rx tx_or_rx, enum Tcp_Udp tcp_or_udp) {
-    char tcp_filename[80], udp_filename[80];
-    jlong tcp_bytes = -1, udp_bytes = -1, total_bytes = -1;
-
-    switch (tx_or_rx) {
-        case TX:
-            sprintf(tcp_filename, "/proc/uid_stat/%d/tcp_snd", uid);
-            sprintf(udp_filename, "/proc/uid_stat/%d/udp_snd", uid);
-            break;
-        case RX:
-            sprintf(tcp_filename, "/proc/uid_stat/%d/tcp_rcv", uid);
-            sprintf(udp_filename, "/proc/uid_stat/%d/udp_rcv", uid);
-            break;
-        default:
-            return -1;
-    }
-
-    switch (tcp_or_udp) {
-        case TCP:
-            tcp_bytes = readNumber(tcp_filename);
-            total_bytes = (tcp_bytes >= 0) ? tcp_bytes : -1;
-            break;
-        case UDP:
-            udp_bytes = readNumber(udp_filename);
-            total_bytes = (udp_bytes >= 0) ? udp_bytes : -1;
-            break;
-        case TCP_AND_UDP:
-            tcp_bytes = readNumber(tcp_filename);
-            total_bytes += (tcp_bytes >= 0 ? tcp_bytes : 0);
-
-            udp_bytes = readNumber(udp_filename);
-            total_bytes += (udp_bytes >= 0 ? udp_bytes : 0);
-            break;
-        default:
-            return -1;
-    }
-
-    return total_bytes;
-}
-
-static jlong getUidPkts(JNIEnv* env, jobject clazz, jint uid,
-                         enum Tx_Rx tx_or_rx, enum Tcp_Udp tcp_or_udp) {
-    char tcp_filename[80], udp_filename[80];
-    jlong tcp_pkts = -1, udp_pkts = -1, total_pkts = -1;
-
-    switch (tx_or_rx) {
-        case TX:
-            sprintf(tcp_filename, "/proc/uid_stat/%d/tcp_snd_pkt", uid);
-            sprintf(udp_filename, "/proc/uid_stat/%d/udp_snd_pkt", uid);
-            break;
-        case RX:
-            sprintf(tcp_filename, "/proc/uid_stat/%d/tcp_rcv_pkt", uid);
-            sprintf(udp_filename, "/proc/uid_stat/%d/udp_rcv_pkt", uid);
-            break;
-        default:
-            return -1;
-    }
-
-    switch (tcp_or_udp) {
-        case TCP:
-            tcp_pkts = readNumber(tcp_filename);
-            total_pkts = (tcp_pkts >= 0) ? tcp_pkts : -1;
-            break;
-        case UDP:
-            udp_pkts = readNumber(udp_filename);
-            total_pkts = (udp_pkts >= 0) ? udp_pkts : -1;
-            break;
-        case TCP_AND_UDP:
-            tcp_pkts = readNumber(tcp_filename);
-            total_pkts += (tcp_pkts >= 0 ? tcp_pkts : 0);
-
-            udp_pkts = readNumber(udp_filename);
-            total_pkts += (udp_pkts >= 0 ? udp_pkts : 0);
-            break;
-        default:
-            return -1;
+static jlong getUidStat(JNIEnv* env, jclass clazz, jint uid, jint type) {
+    struct Stats stats;
+    memset(&stats, 0, sizeof(Stats));
+    if (parseUidStats(uid, &stats) == 0) {
+        return getStatsType(&stats, (StatsType) type);
+    } else {
+        return UNKNOWN;
     }
-
-    return total_pkts;
-}
-
-static jlong getUidRxBytes(JNIEnv* env, jobject clazz, jint uid) {
-    return getUidBytes(env, clazz, uid, RX, TCP_AND_UDP);
-}
-
-static jlong getUidTxBytes(JNIEnv* env, jobject clazz, jint uid) {
-    return getUidBytes(env, clazz, uid, TX, TCP_AND_UDP);
-}
-
-/* TCP Segments + UDP Packets */
-static jlong getUidTxPackets(JNIEnv* env, jobject clazz, jint uid) {
-    return getUidPkts(env, clazz, uid, TX, TCP_AND_UDP);
-}
-
-/* TCP Segments + UDP Packets */
-static jlong getUidRxPackets(JNIEnv* env, jobject clazz, jint uid) {
-    return getUidPkts(env, clazz, uid, RX, TCP_AND_UDP);
-}
-
-static jlong getUidTcpTxBytes(JNIEnv* env, jobject clazz, jint uid) {
-    return getUidBytes(env, clazz, uid, TX, TCP);
-}
-
-static jlong getUidTcpRxBytes(JNIEnv* env, jobject clazz, jint uid) {
-    return getUidBytes(env, clazz, uid, RX, TCP);
-}
-
-static jlong getUidUdpTxBytes(JNIEnv* env, jobject clazz, jint uid) {
-    return getUidBytes(env, clazz, uid, TX, UDP);
-}
-
-static jlong getUidUdpRxBytes(JNIEnv* env, jobject clazz, jint uid) {
-    return getUidBytes(env, clazz, uid, RX, UDP);
-}
-
-static jlong getUidTcpTxSegments(JNIEnv* env, jobject clazz, jint uid) {
-    return getUidPkts(env, clazz, uid, TX, TCP);
-}
-
-static jlong getUidTcpRxSegments(JNIEnv* env, jobject clazz, jint uid) {
-    return getUidPkts(env, clazz, uid, RX, TCP);
-}
-
-static jlong getUidUdpTxPackets(JNIEnv* env, jobject clazz, jint uid) {
-    return getUidPkts(env, clazz, uid, TX, UDP);
-}
-
-static jlong getUidUdpRxPackets(JNIEnv* env, jobject clazz, jint uid) {
-    return getUidPkts(env, clazz, uid, RX, UDP);
 }
 
 static JNINativeMethod gMethods[] = {
     {"nativeGetTotalStat", "(I)J", (void*) getTotalStat},
     {"nativeGetIfaceStat", "(Ljava/lang/String;I)J", (void*) getIfaceStat},
-
-    /* Per-UID Stats */
-    {"getUidTxBytes", "(I)J", (void*) getUidTxBytes},
-    {"getUidRxBytes", "(I)J", (void*) getUidRxBytes},
-    {"getUidTxPackets", "(I)J", (void*) getUidTxPackets},
-    {"getUidRxPackets", "(I)J", (void*) getUidRxPackets},
-
-    {"getUidTcpTxBytes", "(I)J", (void*) getUidTcpTxBytes},
-    {"getUidTcpRxBytes", "(I)J", (void*) getUidTcpRxBytes},
-    {"getUidUdpTxBytes", "(I)J", (void*) getUidUdpTxBytes},
-    {"getUidUdpRxBytes", "(I)J", (void*) getUidUdpRxBytes},
-
-    {"getUidTcpTxSegments", "(I)J", (void*) getUidTcpTxSegments},
-    {"getUidTcpRxSegments", "(I)J", (void*) getUidTcpRxSegments},
-    {"getUidUdpTxPackets", "(I)J", (void*) getUidUdpTxPackets},
-    {"getUidUdpRxPackets", "(I)J", (void*) getUidUdpRxPackets},
+    {"nativeGetUidStat", "(II)J", (void*) getUidStat},
 };
 
 int register_android_net_TrafficStats(JNIEnv* env) {
diff --git a/core/tests/benchmarks/src/android/net/TrafficStatsBenchmark.java b/core/tests/benchmarks/src/android/net/TrafficStatsBenchmark.java
new file mode 100644
index 0000000..5a29adc
--- /dev/null
+++ b/core/tests/benchmarks/src/android/net/TrafficStatsBenchmark.java
@@ -0,0 +1,39 @@
+/*
+ * Copyright (C) 2013 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package android.net;
+
+import com.google.caliper.SimpleBenchmark;
+
+public class TrafficStatsBenchmark extends SimpleBenchmark {
+    public void timeGetUidRxBytes(int reps) {
+        for (int i = 0; i < reps; i++) {
+            TrafficStats.getUidRxBytes(android.os.Process.myUid());
+        }
+    }
+
+    public void timeGetMobileRxBytes(int reps) {
+        for (int i = 0; i < reps; i++) {
+            TrafficStats.getMobileRxBytes();
+        }
+    }
+
+    public void timeGetTotalRxBytes(int reps) {
+        for (int i = 0; i < reps; i++) {
+            TrafficStats.getTotalRxBytes();
+        }
+    }
+}