1 files changed, 89 insertions, 0 deletions
diff --git a/cmds/statsd/src/external/KernelUidCpuActiveTimeReader.cpp b/cmds/statsd/src/external/KernelUidCpuActiveTimeReader.cpp
new file mode 100644
index 000000000000..0e126e7a4b44
--- /dev/null
+++ b/cmds/statsd/src/external/KernelUidCpuActiveTimeReader.cpp
@@ -0,0 +1,89 @@
+/*
+ * Copyright (C) 2018 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.
+ */
+
+#define DEBUG false  // STOPSHIP if true
+#include "Log.h"
+
+#include <fstream>
+
+#include "KernelUidCpuActiveTimeReader.h"
+#include "guardrail/StatsdStats.h"
+#include "logd/LogEvent.h"
+#include "statslog.h"
+
+using std::make_shared;
+using std::shared_ptr;
+using std::ifstream;
+
+namespace android {
+namespace os {
+namespace statsd {
+
+static const string sProcFile = "/proc/uid_concurrent_active_time";
+static const int kLineBufferSize = 1024;
+
+/**
+ * Reads /proc/uid_concurrent_active_time which has the format:
+ * active: X (X is # cores)
+ * [uid0]: [time-0] [time-1] [time-2] ... (# entries = # cores)
+ * [uid1]: [time-0] [time-1] [time-2] ... ...
+ * ...
+ * Time-N means the CPU time a UID spent running concurrently with N other processes.
+ * The file contains a monotonically increasing count of time for a single boot.
+ */
+KernelUidCpuActiveTimeReader::KernelUidCpuActiveTimeReader() : StatsPuller(android::util::CPU_ACTIVE_TIME) {
+}
+
+bool KernelUidCpuActiveTimeReader::PullInternal(vector<shared_ptr<LogEvent>>* data) {
+    data->clear();
+
+    ifstream fin;
+    fin.open(sProcFile);
+    if (!fin.good()) {
+        VLOG("Failed to read pseudo file %s", sProcFile.c_str());
+        return false;
+    }
+
+    uint64_t timestamp = time(nullptr) * NS_PER_SEC;
+    char buf[kLineBufferSize];
+    char* pch;
+    while (!fin.eof()) {
+        fin.getline(buf, kLineBufferSize);
+        pch = strtok(buf, " :");
+        if (pch == NULL) break;
+        uint64_t uid = std::stoull(pch);
+        pch = strtok(NULL, " ");
+        uint64_t timeMs;
+        int idx = 0;
+        do {
+            timeMs = std::stoull(pch);
+            auto ptr = make_shared<LogEvent>(mTagId, timestamp);
+            ptr->write(uid);
+            ptr->write(idx);
+            ptr->write(timeMs);
+            ptr->init();
+            data->push_back(ptr);
+            VLOG("uid %lld, freq idx %d, active time %lld", (long long)uid, idx, (long long)timeMs);
+            idx++;
+            pch = strtok(NULL, " ");
+        } while (pch != NULL);
+    }
+    return true;
+}
+
+}  // namespace statsd
+}  // namespace os
+}  // namespace android