profcollectd: initial import

A daemon to collect, process, and upload sampling traces to aid platform
AutoFDO optimisation.

Bug: 79161490
Change-Id: Icf9927c56c3d4c6ea7562be4706c0d2f309db341

20 files changed, 1191 insertions, 0 deletions

diff --git a/profcollectd/.clang-format b/profcollectd/.clang-format
new file mode 120000
index 00000000..f7e9891f
--- /dev/null
+++ b/profcollectd/.clang-format
@@ -0,0 +1 @@
+../../../system/core/.clang-format-2
\ No newline at end of file
diff --git a/profcollectd/Android.bp b/profcollectd/Android.bp
new file mode 100644
index 00000000..38282274
--- /dev/null
+++ b/profcollectd/Android.bp
@@ -0,0 +1,60 @@
+//
+// Copyright (C) 2020 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.
+//
+
+cc_defaults {
+    name: "libprofcollectd_defaults",
+    
+    // We are only doing this for C++20. Can be removed after it becomes default.
+    cpp_std: "experimental",
+
+    tidy: true,
+    tidy_checks: [
+        "-google-runtime-int",
+        "-google-explicit-constructor",
+        "-bugprone-unhandled-self-assignment",
+        "-bugprone-macro-parentheses",
+    ],
+}
+
+cc_binary {
+    name: "profcollectctl",
+
+    defaults: ["libprofcollectd_defaults"],
+
+    srcs: ["profcollectctl.cpp"],
+
+    shared_libs: ["libprofcollectd"],
+}
+
+cc_binary {
+    name: "profcollectd",
+
+    defaults: ["libprofcollectd_defaults"],
+
+    srcs: ["profcollectd.cpp"],
+
+    shared_libs: ["libprofcollectd"],
+
+    init_rc: ["profcollectd.rc"],
+}
+
+filegroup {
+    name: "profcollectd_aidl",
+    srcs: [
+        "binder/android/os/IProfCollectd.aidl",
+    ],
+    path: "binder",
+}
diff --git a/profcollectd/MODULE_LICENSE_APACHE2 b/profcollectd/MODULE_LICENSE_APACHE2
new file mode 100644
index 00000000..e69de29b
--- /dev/null
+++ b/profcollectd/MODULE_LICENSE_APACHE2
diff --git a/profcollectd/NOTICE b/profcollectd/NOTICE
new file mode 100644
index 00000000..f3e7764f
--- /dev/null
+++ b/profcollectd/NOTICE
@@ -0,0 +1,190 @@
+
+   Copyright (c) 2020, 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.
+
+   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.
+
+
+                                 Apache License
+                           Version 2.0, January 2004
+                        http://www.apache.org/licenses/
+
+   TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
+
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+      outstanding shares, or (iii) beneficial ownership of such entity.
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+      "You" (or "Your") shall mean an individual or Legal Entity
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+      "Work" shall mean the work of authorship, whether in Source or
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+      "Derivative Works" shall mean any work, whether in Source or Object
+      form, that is based on (or derived from) the Work and for which the
+      editorial revisions, annotations, elaborations, or other modifications
+      represent, as a whole, an original work of authorship. For the purposes
+      of this License, Derivative Works shall not include works that remain
+      separable from, or merely link (or bind by name) to the interfaces of,
+      the Work and Derivative Works thereof.
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+      "Contribution" shall mean any work of authorship, including
+      the original version of the Work and any modifications or additions
+      to that Work or Derivative Works thereof, that is intentionally
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+      "Contributor" shall mean Licensor and any individual or Legal Entity
+      on behalf of whom a Contribution has been received by Licensor and
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+   2. Grant of Copyright License. Subject to the terms and conditions of
+      this License, each Contributor hereby grants to You a perpetual,
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+      (except as stated in this section) patent license to make, have made,
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+      Contribution(s) alone or by combination of their Contribution(s)
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+      institute patent litigation against any entity (including a
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+   4. Redistribution. You may reproduce and distribute copies of the
+      Work or Derivative Works thereof in any medium, with or without
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+      meet the following conditions:
+
+      (a) You must give any other recipients of the Work or
+          Derivative Works a copy of this License; and
+
+      (b) You must cause any modified files to carry prominent notices
+          stating that You changed the files; and
+
+      (c) You must retain, in the Source form of any Derivative Works
+          that You distribute, all copyright, patent, trademark, and
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+      (d) If the Work includes a "NOTICE" text file as part of its
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+          of the following places: within a NOTICE text file distributed
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+          within a display generated by the Derivative Works, if and
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+          of the NOTICE file are for informational purposes only and
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+          notices within Derivative Works that You distribute, alongside
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+      You may add Your own copyright statement to Your modifications and
+      may provide additional or different license terms and conditions
+      for use, reproduction, or distribution of Your modifications, or
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+      reproduction, and distribution of the Work otherwise complies with
+      the conditions stated in this License.
+
+   5. Submission of Contributions. Unless You explicitly state otherwise,
+      any Contribution intentionally submitted for inclusion in the Work
+      by You to the Licensor shall be under the terms and conditions of
+      this License, without any additional terms or conditions.
+      Notwithstanding the above, nothing herein shall supersede or modify
+      the terms of any separate license agreement you may have executed
+      with Licensor regarding such Contributions.
+
+   6. Trademarks. This License does not grant permission to use the trade
+      names, trademarks, service marks, or product names of the Licensor,
+      except as required for reasonable and customary use in describing the
+      origin of the Work and reproducing the content of the NOTICE file.
+
+   7. Disclaimer of Warranty. Unless required by applicable law or
+      agreed to in writing, Licensor provides the Work (and each
+      Contributor provides its Contributions) on an "AS IS" BASIS,
+      WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
+      implied, including, without limitation, any warranties or conditions
+      of TITLE, NON-INFRINGEMENT, MERCHANTABILITY, or FITNESS FOR A
+      PARTICULAR PURPOSE. You are solely responsible for determining the
+      appropriateness of using or redistributing the Work and assume any
+      risks associated with Your exercise of permissions under this License.
+
+   8. Limitation of Liability. In no event and under no legal theory,
+      whether in tort (including negligence), contract, or otherwise,
+      unless required by applicable law (such as deliberate and grossly
+      negligent acts) or agreed to in writing, shall any Contributor be
+      liable to You for damages, including any direct, indirect, special,
+      incidental, or consequential damages of any character arising as a
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+   9. Accepting Warranty or Additional Liability. While redistributing
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+      defend, and hold each Contributor harmless for any liability
+      incurred by, or claims asserted against, such Contributor by reason
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+   END OF TERMS AND CONDITIONS
+
diff --git a/profcollectd/OWNERS b/profcollectd/OWNERS
new file mode 100644
index 00000000..b380e395
--- /dev/null
+++ b/profcollectd/OWNERS
@@ -0,0 +1,3 @@
+srhines@google.com
+yabinc@google.com
+yikong@google.com
diff --git a/profcollectd/binder/android/os/IProfCollectd.aidl b/profcollectd/binder/android/os/IProfCollectd.aidl
new file mode 100644
index 00000000..03f6b19b
--- /dev/null
+++ b/profcollectd/binder/android/os/IProfCollectd.aidl
@@ -0,0 +1,26 @@
+/*
+ * Copyright (C) 2020 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.os;
+
+/** {@hide} */
+interface IProfCollectd {
+    void ReadConfig();
+    void ScheduleCollection();
+    void TerminateCollection();
+    void TraceOnce();
+    void ProcessProfile();
+}
diff --git a/profcollectd/libprofcollectd/Android.bp b/profcollectd/libprofcollectd/Android.bp
new file mode 100644
index 00000000..7b1b2f31
--- /dev/null
+++ b/profcollectd/libprofcollectd/Android.bp
@@ -0,0 +1,46 @@
+//
+// Copyright (C) 2020 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.
+//
+
+cc_library {
+    name: "libprofcollectd",
+
+    defaults: ["libprofcollectd_defaults"],
+
+    shared_libs: [
+        "libbase",
+        "libbinder",
+        "libjsoncpp",
+        "liblog",
+        "libsimpleperf_profcollect",
+        "libutils",
+        "libziparchive",
+    ],
+
+    static_libs: [
+        "libc++fs",
+    ],
+
+    srcs: [
+        "binder_service.cpp",
+        "compress.cpp",
+        "interface.cpp",
+        "scheduler.cpp",
+        "simpleperf_etm_provider.cpp",
+        ":profcollectd_aidl",
+    ],
+
+    export_include_dirs: ["include"],
+}
diff --git a/profcollectd/libprofcollectd/binder_service.cpp b/profcollectd/libprofcollectd/binder_service.cpp
new file mode 100644
index 00000000..0eb9caaa
--- /dev/null
+++ b/profcollectd/libprofcollectd/binder_service.cpp
@@ -0,0 +1,71 @@
+//
+// Copyright (C) 2020 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 LOG_TAG "profcollectd_binder"
+
+#include "binder_service.h"
+
+#include <android-base/logging.h>
+
+#include "hwtrace_provider.h"
+#include "scheduler.h"
+
+namespace android {
+namespace profcollectd {
+
+using ::android::binder::Status;
+using ::android::os::IProfCollectd;
+
+namespace {
+
+Status HandleIfError(const std::function<OptError()>& action) {
+  auto errmsg = action();
+  if (errmsg) {
+    LOG(ERROR) << errmsg.value();
+    return Status::fromExceptionCode(1, errmsg.value().c_str());
+  }
+  return Status::ok();
+}
+
+}  // namespace
+
+ProfcollectdBinder::ProfcollectdBinder() {
+  ProfcollectdBinder::Scheduler = std::make_unique<ProfcollectdScheduler>();
+  LOG(INFO) << "Binder service started";
+}
+
+Status ProfcollectdBinder::ReadConfig() {
+  return HandleIfError([=]() { return Scheduler->ReadConfig(); });
+}
+
+Status ProfcollectdBinder::ScheduleCollection() {
+  return HandleIfError([=]() { return Scheduler->ScheduleCollection(); });
+}
+
+Status ProfcollectdBinder::TerminateCollection() {
+  return HandleIfError([=]() { return Scheduler->TerminateCollection(); });
+}
+
+Status ProfcollectdBinder::TraceOnce() {
+  return HandleIfError([=]() { return Scheduler->TraceOnce(); });
+}
+
+Status ProfcollectdBinder::ProcessProfile() {
+  return HandleIfError([=]() { return Scheduler->ProcessProfile(); });
+}
+
+}  // namespace profcollectd
+}  // namespace android
diff --git a/profcollectd/libprofcollectd/binder_service.h b/profcollectd/libprofcollectd/binder_service.h
new file mode 100644
index 00000000..83197666
--- /dev/null
+++ b/profcollectd/libprofcollectd/binder_service.h
@@ -0,0 +1,45 @@
+//
+// Copyright (C) 2020 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.
+//
+
+#pragma once
+
+#include <binder/BinderService.h>
+#include <binder/Status.h>
+
+#include "android/os/BnProfCollectd.h"
+#include "scheduler.h"
+
+namespace android {
+namespace profcollectd {
+
+class ProfcollectdBinder : public BinderService<ProfcollectdBinder>, public os::BnProfCollectd {
+ public:
+  explicit ProfcollectdBinder();
+
+  static constexpr const char* getServiceName() { return "profcollectd"; }
+
+  binder::Status ReadConfig() override;
+  binder::Status ScheduleCollection() override;
+  binder::Status TerminateCollection() override;
+  binder::Status TraceOnce() override;
+  binder::Status ProcessProfile() override;
+
+ protected:
+  inline static std::unique_ptr<ProfcollectdScheduler> Scheduler;
+};
+
+}  // namespace profcollectd
+}  // namespace android
diff --git a/profcollectd/libprofcollectd/compress.cpp b/profcollectd/libprofcollectd/compress.cpp
new file mode 100644
index 00000000..6a2b2e8e
--- /dev/null
+++ b/profcollectd/libprofcollectd/compress.cpp
@@ -0,0 +1,49 @@
+//
+// Copyright (C) 2020 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 "compress.h"
+
+#include <ziparchive/zip_writer.h>
+#include <cstdlib>
+#include <fstream>
+#include <iostream>
+
+namespace android {
+namespace profcollectd {
+
+bool CompressFiles(const std::filesystem::path& output,
+                   std::vector<std::filesystem::path>& inputFiles) {
+  FILE* outputFile = std::fopen(output.c_str(), "wb");
+  ZipWriter writer(outputFile);
+
+  for (const auto& f : inputFiles) {
+    // read profile into memory.
+    std::ifstream ifs(f, std::ios::in | std::ios::binary);
+    std::vector<char> buf((std::istreambuf_iterator<char>(ifs)), std::istreambuf_iterator<char>());
+
+    // append to zip file
+    writer.StartEntry(f.filename().string(), ZipWriter::kCompress | ZipWriter::kAlign32);
+    writer.WriteBytes(buf.data(), buf.size());
+    writer.FinishEntry();
+  }
+
+  auto ret = writer.Finish();
+  std::fclose(outputFile);
+  return ret == 0;
+}
+
+}  // namespace profcollectd
+}  // namespace android
diff --git a/profcollectd/libprofcollectd/compress.h b/profcollectd/libprofcollectd/compress.h
new file mode 100644
index 00000000..f99deca1
--- /dev/null
+++ b/profcollectd/libprofcollectd/compress.h
@@ -0,0 +1,27 @@
+//
+// Copyright (C) 2020 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.
+//
+
+#pragma once
+
+#include <filesystem>
+
+namespace android {
+namespace profcollectd {
+
+bool CompressFiles(const std::filesystem::path& output, std::vector<std::filesystem::path>& files);
+
+}  // namespace profcollectd
+}  // namespace android
diff --git a/profcollectd/libprofcollectd/hwtrace_provider.h b/profcollectd/libprofcollectd/hwtrace_provider.h
new file mode 100644
index 00000000..59329dd0
--- /dev/null
+++ b/profcollectd/libprofcollectd/hwtrace_provider.h
@@ -0,0 +1,48 @@
+//
+// Copyright (C) 2020 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.
+//
+
+#pragma once
+
+#include <chrono>
+#include <filesystem>
+#include <functional>
+
+namespace android {
+namespace profcollectd {
+
+class HwtraceProvider {
+ public:
+  virtual ~HwtraceProvider() = default;
+
+  /**
+   * Trace for the given length of time.
+   *
+   * @param period Length of time to trace in seconds.
+   * @return True if successful.
+   */
+  virtual bool Trace(const std::filesystem::path& outputPath,
+                     std::chrono::duration<float> samplingPeriod) = 0;
+
+  /**
+   * Process the hardware trace to generate simpleperf intermediate profile.
+   */
+  virtual bool Process(const std::filesystem::path& inputPath,
+                       const std::filesystem::path& outputPath,
+                       const std::string& binaryFilter) = 0;
+};
+
+}  // namespace profcollectd
+}  // namespace android
\ No newline at end of file
diff --git a/profcollectd/libprofcollectd/include/libprofcollectd.h b/profcollectd/libprofcollectd/include/libprofcollectd.h
new file mode 100644
index 00000000..1beebb61
--- /dev/null
+++ b/profcollectd/libprofcollectd/include/libprofcollectd.h
@@ -0,0 +1,33 @@
+//
+// Copyright (C) 2020 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.
+//
+
+#pragma once
+
+namespace android {
+namespace profcollectd {
+
+// Daemon side operations.
+void InitService(bool start);
+
+// Client side operations.
+void ScheduleCollection();
+void TerminateCollection();
+void TraceOnce();
+void Process();
+void ReadConfig();
+
+}  // namespace profcollectd
+}  // namespace android
diff --git a/profcollectd/libprofcollectd/interface.cpp b/profcollectd/libprofcollectd/interface.cpp
new file mode 100644
index 00000000..f7985761
--- /dev/null
+++ b/profcollectd/libprofcollectd/interface.cpp
@@ -0,0 +1,86 @@
+//
+// Copyright (C) 2020 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 LOG_TAG "profcollectd"
+
+#include "libprofcollectd.h"
+
+#include <android-base/logging.h>
+
+#include <iostream>
+
+#include "binder_service.h"
+
+namespace android {
+namespace profcollectd {
+
+using ::android::os::IProfCollectd;
+
+namespace {
+
+sp<IProfCollectd> GetIProfcollectdService() {
+  sp<ProcessState> proc(ProcessState::self());
+  sp<IBinder> binder =
+      defaultServiceManager()->getService(String16(ProfcollectdBinder::getServiceName()));
+  if (!binder) {
+    std::cerr << "Cannot connect to the daemon, is it running?" << std::endl;
+    exit(EXIT_FAILURE);
+  }
+
+  return interface_cast<IProfCollectd>(binder);
+}
+
+}  // namespace
+
+void InitService(bool start) {
+  if (defaultServiceManager()->checkService(String16(ProfcollectdBinder::getServiceName()))) {
+    ALOGE("Another instance of profcollectd is already running");
+    exit(EXIT_FAILURE);
+  }
+
+  sp<ProcessState> proc(ProcessState::self());
+  sp<IServiceManager> sm(defaultServiceManager());
+  auto svc = sp<ProfcollectdBinder>(new ProfcollectdBinder());
+  sm->addService(String16(ProfcollectdBinder::getServiceName()), svc);
+  if (start) {
+    svc->ScheduleCollection();
+  }
+  ProcessState::self()->startThreadPool();
+  IPCThreadState::self()->joinThreadPool();
+}
+
+void ScheduleCollection() {
+  GetIProfcollectdService()->ScheduleCollection();
+}
+
+void TerminateCollection() {
+  GetIProfcollectdService()->TerminateCollection();
+}
+
+void TraceOnce() {
+  GetIProfcollectdService()->TraceOnce();
+}
+
+void Process() {
+  GetIProfcollectdService()->ProcessProfile();
+}
+
+void ReadConfig() {
+  GetIProfcollectdService()->ReadConfig();
+}
+
+}  // namespace profcollectd
+}  // namespace android
diff --git a/profcollectd/libprofcollectd/scheduler.cpp b/profcollectd/libprofcollectd/scheduler.cpp
new file mode 100644
index 00000000..38bf19a4
--- /dev/null
+++ b/profcollectd/libprofcollectd/scheduler.cpp
@@ -0,0 +1,216 @@
+//
+// Copyright (C) 2020 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 LOG_TAG "profcollectd_scheduler"
+
+#include "scheduler.h"
+
+#include <fstream>
+#include <variant>
+#include <vector>
+
+#include <android-base/logging.h>
+#include <android-base/properties.h>
+
+#include "compress.h"
+#include "hwtrace_provider.h"
+#include "json/json.h"
+#include "json/writer.h"
+
+// Default option values.
+using config_t = std::pair<const char*, std::variant<const int, const char*>>;
+static constexpr const config_t CONFIG_BUILD_FINGERPRINT = {"Fingerprint", "unknown"};
+static constexpr const config_t CONFIG_COLLECTION_INTERVAL_SEC = {"CollectionInterval", 600};
+static constexpr const config_t CONFIG_SAMPLING_PERIOD_MS = {"SamplingPeriod", 500};
+static constexpr const config_t CONFIG_TRACE_OUTDIR = {"TraceDir", "/data/misc/profcollectd/trace"};
+static constexpr const config_t CONFIG_PROFILE_OUTDIR = {"ProfileDir",
+                                                         "/data/misc/profcollectd/output"};
+static constexpr const config_t CONFIG_BINARY_FILTER = {"BinaryFilter", ""};
+
+namespace android {
+namespace profcollectd {
+
+namespace fs = std::filesystem;
+using ::android::base::GetIntProperty;
+using ::android::base::GetProperty;
+
+// Hwtrace provider registry
+extern std::unique_ptr<HwtraceProvider> REGISTER_SIMPLEPERF_ETM_PROVIDER();
+
+namespace {
+
+void ClearDir(const fs::path& path) {
+  if (fs::exists(path)) {
+    for (const auto& entry : fs::directory_iterator(path)) {
+      fs::remove_all(entry);
+    }
+  }
+}
+
+bool ClearOnConfigChange(const ProfcollectdScheduler::Config& config) {
+  const fs::path configFile = config.profileOutputDir / "config.json";
+  ProfcollectdScheduler::Config oldConfig{};
+
+  // Read old config, if exists.
+  if (fs::exists(configFile)) {
+    std::ifstream ifs(configFile);
+    ifs >> oldConfig;
+  }
+
+  if (oldConfig != config) {
+    LOG(INFO) << "Clearing profiles due to config change.";
+    ClearDir(config.traceOutputDir);
+    ClearDir(config.profileOutputDir);
+
+    // Write new config.
+    std::ofstream ofs(configFile);
+    ofs << config;
+    return true;
+  }
+  return false;
+}
+
+void PeriodicCollectionWorker(std::future<void> terminationSignal, ProfcollectdScheduler& scheduler,
+                              std::chrono::seconds& interval) {
+  do {
+    scheduler.TraceOnce();
+  } while ((terminationSignal.wait_for(interval)) == std::future_status::timeout);
+}
+
+}  // namespace
+
+ProfcollectdScheduler::ProfcollectdScheduler() {
+  ReadConfig();
+
+  // Load a registered hardware trace provider.
+  if ((hwtracer = REGISTER_SIMPLEPERF_ETM_PROVIDER())) {
+    LOG(INFO) << "ETM provider registered.";
+    return;
+  } else {
+    LOG(ERROR) << "No hardware trace provider found for this architecture.";
+    exit(EXIT_FAILURE);
+  }
+}
+
+OptError ProfcollectdScheduler::ReadConfig() {
+  if (workerThread != nullptr) {
+    static std::string errmsg = "Terminate the collection before refreshing config.";
+    return errmsg;
+  }
+
+  const std::lock_guard<std::mutex> lock(mu);
+
+  config.buildFingerprint = GetProperty("ro.build.fingerprint", "unknown");
+  config.collectionInterval = std::chrono::seconds(
+      GetIntProperty("profcollectd.collection_interval",
+                     std::get<const int>(CONFIG_COLLECTION_INTERVAL_SEC.second)));
+  config.samplingPeriod = std::chrono::milliseconds(GetIntProperty(
+      "profcollectd.sampling_period_ms", std::get<const int>(CONFIG_SAMPLING_PERIOD_MS.second)));
+  config.traceOutputDir = GetProperty("profcollectd.trace_output_dir",
+                                      std::get<const char*>(CONFIG_TRACE_OUTDIR.second));
+  config.profileOutputDir =
+      GetProperty("profcollectd.output_dir", std::get<const char*>(CONFIG_PROFILE_OUTDIR.second));
+  config.binaryFilter =
+      GetProperty("profcollectd.binary_filter", std::get<const char*>(CONFIG_BINARY_FILTER.second));
+  ClearOnConfigChange(config);
+
+  return std::nullopt;
+}
+
+OptError ProfcollectdScheduler::ScheduleCollection() {
+  if (workerThread != nullptr) {
+    static std::string errmsg = "Collection is already scheduled.";
+    return errmsg;
+  }
+
+  workerThread =
+      std::make_unique<std::thread>(PeriodicCollectionWorker, terminate.get_future(),
+                                    std::ref(*this), std::ref(config.collectionInterval));
+  return std::nullopt;
+}
+
+OptError ProfcollectdScheduler::TerminateCollection() {
+  if (workerThread == nullptr) {
+    static std::string errmsg = "Collection is not scheduled.";
+    return errmsg;
+  }
+
+  terminate.set_value();
+  workerThread->join();
+  workerThread = nullptr;
+  terminate = std::promise<void>();  // Reset promise.
+  return std::nullopt;
+}
+
+OptError ProfcollectdScheduler::TraceOnce() {
+  const std::lock_guard<std::mutex> lock(mu);
+  bool success = hwtracer->Trace(config.traceOutputDir, config.samplingPeriod);
+  if (!success) {
+    static std::string errmsg = "Trace failed";
+    return errmsg;
+  }
+  return std::nullopt;
+}
+
+OptError ProfcollectdScheduler::ProcessProfile() {
+  const std::lock_guard<std::mutex> lock(mu);
+  hwtracer->Process(config.traceOutputDir, config.profileOutputDir, config.binaryFilter);
+  std::vector<fs::path> profiles;
+  profiles.insert(profiles.begin(), fs::directory_iterator(config.profileOutputDir),
+                  fs::directory_iterator());
+  bool success = CompressFiles("/sdcard/profile.zip", profiles);
+  if (!success) {
+    static std::string errmsg = "Compress files failed";
+    return errmsg;
+  }
+  return std::nullopt;
+}
+
+std::ostream& operator<<(std::ostream& os, const ProfcollectdScheduler::Config& config) {
+  Json::Value root;
+  const auto writer = std::make_unique<Json::StyledStreamWriter>();
+  root[CONFIG_BUILD_FINGERPRINT.first] = config.buildFingerprint;
+  root[CONFIG_COLLECTION_INTERVAL_SEC.first] = config.collectionInterval.count();
+  root[CONFIG_SAMPLING_PERIOD_MS.first] = config.samplingPeriod.count();
+  root[CONFIG_TRACE_OUTDIR.first] = config.traceOutputDir.c_str();
+  root[CONFIG_PROFILE_OUTDIR.first] = config.profileOutputDir.c_str();
+  root[CONFIG_BINARY_FILTER.first] = config.binaryFilter.c_str();
+  writer->write(os, root);
+  return os;
+}
+
+std::istream& operator>>(std::istream& is, ProfcollectdScheduler::Config& config) {
+  Json::Value root;
+  const auto reader = std::make_unique<Json::Reader>();
+  bool success = reader->parse(is, root);
+  if (!success) {
+    return is;
+  }
+
+  config.buildFingerprint = root[CONFIG_BUILD_FINGERPRINT.first].asString();
+  config.collectionInterval =
+      std::chrono::seconds(root[CONFIG_COLLECTION_INTERVAL_SEC.first].asInt64());
+  config.samplingPeriod =
+      std::chrono::duration<float>(root[CONFIG_SAMPLING_PERIOD_MS.first].asFloat());
+  config.traceOutputDir = root[CONFIG_TRACE_OUTDIR.first].asString();
+  config.profileOutputDir = root[CONFIG_PROFILE_OUTDIR.first].asString();
+  config.binaryFilter = root[CONFIG_BINARY_FILTER.first].asString();
+
+  return is;
+}
+
+}  // namespace profcollectd
+}  // namespace android
diff --git a/profcollectd/libprofcollectd/scheduler.h b/profcollectd/libprofcollectd/scheduler.h
new file mode 100644
index 00000000..3325abab
--- /dev/null
+++ b/profcollectd/libprofcollectd/scheduler.h
@@ -0,0 +1,65 @@
+//
+// Copyright (C) 2020 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.
+//
+
+#pragma once
+
+#include <compare>
+#include <future>
+#include <mutex>
+#include <optional>
+#include <thread>
+
+#include "hwtrace_provider.h"
+
+using OptError = std::optional<std::string>;
+
+namespace android {
+namespace profcollectd {
+
+class ProfcollectdScheduler {
+ public:
+  struct Config {
+    std::string buildFingerprint;
+    std::chrono::seconds collectionInterval;
+    std::chrono::duration<float> samplingPeriod;
+    std::filesystem::path traceOutputDir;
+    std::filesystem::path profileOutputDir;
+    std::string binaryFilter;
+
+    auto operator<=>(const Config&) const = default;
+    friend std::ostream& operator<<(std::ostream& os, const Config& config);
+    friend std::istream& operator>>(std::istream& is, Config& config);
+  };
+
+  explicit ProfcollectdScheduler();
+
+  // Methods below returns optional error message on failure, otherwise returns std::nullopt.
+  OptError ReadConfig();
+  OptError ScheduleCollection();
+  OptError TerminateCollection();
+  OptError TraceOnce();
+  OptError ProcessProfile();
+
+ private:
+  Config config;
+  std::promise<void> terminate;
+  std::unique_ptr<HwtraceProvider> hwtracer;
+  std::unique_ptr<std::thread> workerThread;
+  std::mutex mu;
+};
+
+}  // namespace profcollectd
+}  // namespace android
\ No newline at end of file
diff --git a/profcollectd/libprofcollectd/simpleperf_etm_provider.cpp b/profcollectd/libprofcollectd/simpleperf_etm_provider.cpp
new file mode 100644
index 00000000..8882ccd5
--- /dev/null
+++ b/profcollectd/libprofcollectd/simpleperf_etm_provider.cpp
@@ -0,0 +1,96 @@
+//
+// Copyright (C) 2020 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 LOG_TAG "profcolelctd_simpleperf_etm"
+
+#include "hwtrace_provider.h"
+
+#include <android-base/logging.h>
+#include <simpleperf_profcollect.h>
+
+#include <cstdlib>
+#include <filesystem>
+#include <sstream>
+#include <string>
+#include <thread>
+
+static constexpr const char* ETM_TRACEFILE_EXTENSION = ".etmtrace";
+static constexpr const char* OUTPUT_FILE_EXTENSION = ".data";
+
+namespace {
+
+std::string GetTimestamp() {
+  auto now = std::time(nullptr);
+  char timestr[32];
+  std::strftime(timestr, sizeof(timestr), "%Y%m%d-%H%M%S", std::localtime(&now));
+  return timestr;
+}
+
+}  // namespace
+
+namespace android {
+namespace profcollectd {
+
+namespace fs = std::filesystem;
+
+class SimpleperfETMProvider : public HwtraceProvider {
+ public:
+  static bool IsSupported();
+  bool Trace(const fs::path& outputPath, std::chrono::duration<float> samplingPeriod) override;
+  bool Process(const fs::path& inputPath, const fs::path& outputPath,
+               const std::string& binaryFilter) override;
+};
+
+bool SimpleperfETMProvider::IsSupported() {
+  return simpleperf::etm::HasSupport();
+}
+
+bool SimpleperfETMProvider::Trace(const fs::path& outputPath,
+                                  std::chrono::duration<float> samplingPeriod) {
+  const std::string timestamp = GetTimestamp();
+  auto outputFile = outputPath / (timestamp + ETM_TRACEFILE_EXTENSION);
+  return simpleperf::etm::Record(outputFile, samplingPeriod);
+}
+
+bool SimpleperfETMProvider::Process(const fs::path& inputPath, const fs::path& outputPath,
+                                    const std::string& binaryFilter) {
+  for (const auto& entry : fs::directory_iterator(inputPath)) {
+    const fs::path& traceFile = entry.path();
+    if (traceFile.extension() != ETM_TRACEFILE_EXTENSION) {
+      continue;
+    }
+
+    const fs::path binaryOutput =
+        outputPath / traceFile.filename().replace_extension(OUTPUT_FILE_EXTENSION);
+
+    bool success = simpleperf::etm::Inject(traceFile, binaryOutput, binaryFilter);
+    if (success) {
+      fs::remove(traceFile);
+    }
+  }
+
+  return true;
+}
+
+std::unique_ptr<HwtraceProvider> REGISTER_SIMPLEPERF_ETM_PROVIDER() {
+  if (SimpleperfETMProvider::IsSupported()) {
+    return std::make_unique<SimpleperfETMProvider>();
+  }
+  return nullptr;
+}
+
+}  // namespace profcollectd
+}  // namespace android
diff --git a/profcollectd/profcollectctl.cpp b/profcollectd/profcollectctl.cpp
new file mode 100644
index 00000000..897d04e2
--- /dev/null
+++ b/profcollectd/profcollectctl.cpp
@@ -0,0 +1,71 @@
+//
+// Copyright (C) 2020 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 <stdlib.h>
+
+#include <iostream>
+
+#include "libprofcollectd.h"
+
+namespace profcollectd = android::profcollectd;
+
+namespace {
+
+void PrintHelp(const std::string& reason = "") {
+  std::cout << reason;
+  std::cout << R"(
+usage: profcollectctl [command]
+command:
+    start       Schedule periodic collection.
+    stop        Terminate periodic collection.
+    once        Request an one-off trace.
+    process     Convert traces to perf profiles.
+    reconfig    Refresh configuration.
+    help        Print this message.
+)";
+}
+
+}  // namespace
+
+int main(int argc, char** argv) {
+  if (argc != 2) {
+    PrintHelp("Invalid arguments");
+    exit(EXIT_FAILURE);
+  }
+
+  std::string command(argv[1]);
+  if (command == "start") {
+    std::cout << "Scheduling profile collection\n";
+    profcollectd::ScheduleCollection();
+  } else if (command == "stop") {
+    std::cout << "Terminating profile collection\n";
+    profcollectd::TerminateCollection();
+  } else if (command == "once") {
+    std::cout << "Trace once\n";
+    profcollectd::TraceOnce();
+  } else if (command == "process") {
+    std::cout << "Processing traces\n";
+    profcollectd::Process();
+  } else if (command == "reconfig") {
+    std::cout << "Refreshing configuration\n";
+    profcollectd::ReadConfig();
+  } else if (command == "help") {
+    PrintHelp();
+  } else {
+    PrintHelp("Unknown command: " + command);
+    exit(EXIT_FAILURE);
+  }
+}
diff --git a/profcollectd/profcollectd.cpp b/profcollectd/profcollectd.cpp
new file mode 100644
index 00000000..884bf420
--- /dev/null
+++ b/profcollectd/profcollectd.cpp
@@ -0,0 +1,47 @@
+//
+// Copyright (C) 2020 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 <stdlib.h>
+
+#include <iostream>
+
+#include "libprofcollectd.h"
+
+namespace {
+
+void print_help() {
+  std::cout << R"(
+usage: profcollectd [command]
+    boot      Start daemon and schedule profile collection after a short delay.
+    run       Start daemon but do not schedule profile collection.
+)";
+}
+
+}  // namespace
+
+int main(int argc, char** argv) {
+  if (argc != 2) {
+    print_help();
+    exit(EXIT_SUCCESS);
+  } else if (std::string(argv[1]) == "boot") {
+    android::profcollectd::InitService(/* start = */ true);
+  } else if (std::string(argv[1]) == "run") {
+    android::profcollectd::InitService(/* start = */ false);
+  } else {
+    print_help();
+    exit(EXIT_FAILURE);
+  }
+}
diff --git a/profcollectd/profcollectd.rc b/profcollectd/profcollectd.rc
new file mode 100644
index 00000000..26379240
--- /dev/null
+++ b/profcollectd/profcollectd.rc
@@ -0,0 +1,11 @@
+service profcollectd /system/bin/profcollectd boot
+    class late_start
+    user root
+    group root wakelock
+    writepid /dev/cpuset/system-background/tasks
+
+on post-fs-data
+    # Create directory for profcollectd.
+    mkdir /data/misc/profcollectd 0770 root root
+    mkdir /data/misc/profcollectd/trace 0770 root root
+    mkdir /data/misc/profcollectd/output 0770 root root