EXAMPLE: libbinderdebug: generic metric collector

Example binary to collect binder threadpool
usage plus client count for metric dashboards.

Note: dumpsys is already doing similar things as this.
If we have the generic format, we would probably
re-write /system/bin/dumpsys to support that format
rather than needing to use this other binary.

Bug: N/A
Test: N/A
Change-Id: I9f300f05e9475b6d39e8071e5843eccfb3584bc4

2 files changed, 73 insertions, 0 deletions

diff --git a/libs/binderdebug/Android.bp b/libs/binderdebug/Android.bp
index 3eeaf3e4f1..1454727114 100644
--- a/libs/binderdebug/Android.bp
+++ b/libs/binderdebug/Android.bp
@@ -21,6 +21,17 @@ package {
     default_applicable_licenses: ["frameworks_native_license"],
 }
 
+cc_benchmark {
+    name: "binder_thread_stats",
+    shared_libs: [
+        "libutils",
+        "libbinder",
+        "libbase",
+    ],
+    static_libs: ["libbinderdebug"],
+    srcs: ["stats.cpp"],
+}
+
 cc_library {
     name: "libbinderdebug",
     vendor_available: true,
diff --git a/libs/binderdebug/stats.cpp b/libs/binderdebug/stats.cpp
new file mode 100644
index 0000000000..9c26afaa97
--- /dev/null
+++ b/libs/binderdebug/stats.cpp
@@ -0,0 +1,62 @@
+/*
+ * Copyright (C) 2023 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.
+ */
+
+#include <android-base/logging.h>
+#include <binder/BpBinder.h>
+#include <binder/IServiceManager.h>
+#include <binderdebug/BinderDebug.h>
+#include <utils/Errors.h>
+
+#include <inttypes.h>
+
+namespace android {
+
+extern "C" int main() {
+    // ignore args - we only print csv
+
+    // we should use a csv library here for escaping, because
+    // the name is coming from another process
+    printf("name,binder_threads_in_use,binder_threads_started,client_count\n");
+
+    for (const String16& name : defaultServiceManager()->listServices()) {
+        sp<IBinder> binder = defaultServiceManager()->checkService(name);
+        if (binder == nullptr) {
+            fprintf(stderr, "%s is null", String8(name).c_str());
+            continue;
+        }
+
+        BpBinder* remote = binder->remoteBinder();
+        const auto handle = remote->getDebugBinderHandle();
+        CHECK(handle != std::nullopt);
+
+        pid_t pid;
+        CHECK_EQ(OK, binder->getDebugPid(&pid));
+
+        BinderPidInfo info;
+        CHECK_EQ(OK, getBinderPidInfo(BinderDebugContext::BINDER, pid, &info));
+
+        std::vector<pid_t> clientPids;
+        CHECK_EQ(OK,
+                 getBinderClientPids(BinderDebugContext::BINDER, getpid(), pid, *handle,
+                                     &clientPids));
+
+        printf("%s,%" PRIu32 ",%" PRIu32 ",%zu\n", String8(name).c_str(), info.threadUsage,
+               info.threadCount, clientPids.size());
+    }
+    return 0;
+}
+
+} // namespace android