Android systrace: Optimize memory dumps.

systrace/atrace_helper/jni/atrace_process_dump.h

Index: systrace/atrace_helper/jni/atrace_process_dump.h
diff --git a/systrace/atrace_helper/jni/atrace_process_dump.h b/systrace/atrace_helper/jni/atrace_process_dump.h
new file mode 100644
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+++ b/systrace/atrace_helper/jni/atrace_process_dump.h
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+// Copyright 2017 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef ATRACE_PROCESS_DUMP_H_
+#define ATRACE_PROCESS_DUMP_H_
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+
+#include <memory>
+#include <set>
+#include <string>
+
+#include "logging.h"
+#include "process_info.h"
+#include "time_utils.h"
+
+// Program that collects processes, thread names, per-process memory stats and
+// other minor metrics from /proc filesystem. It's aimed to extend systrace
+// with more actionable number to hit performance issues.
+class AtraceProcessDump {
+ public:
+  enum FullDumpMode {
+    kDisabled,
+    kAllProcesses,
+    kAllJavaApps,
+    kOnlyWhitelisted,
+  };
+
+  AtraceProcessDump();
+  ~AtraceProcessDump();
+
+  void RunAndPrintJson(FILE* stream);
+  void Stop();
+
+  void set_dump_count(int count) { dump_count_ = count; }
+  void set_dump_interval(int interval_ms) {
+    dump_timer_ = std::unique_ptr<time_utils::PeriodicTimer>(
+        new time_utils::PeriodicTimer(interval_ms));
+  }
+  void set_full_dump_mode(FullDumpMode mode) { full_dump_mode_ = mode; }
+  void set_full_dump_whitelist(const std::set<std::string> &whitelist) {
+    CHECK(full_dump_mode_ == FullDumpMode::kOnlyWhitelisted);
+    full_dump_whitelist_ = whitelist;
+  }
+  void enable_graphics_stats() { graphics_stats_ = true; }
+  void enable_print_smaps() { print_smaps_ = true; }
+
+ private:
+  AtraceProcessDump(const AtraceProcessDump&) = delete;
+  void operator=(const AtraceProcessDump&) = delete;
+
+  using ProcessMap = std::map<int, std::unique_ptr<ProcessInfo>>;
+  using ProcessSnapshotMap = std::map<int, std::unique_ptr<ProcessSnapshot>>;
+
+  void TakeGlobalSnapshot();
+  bool UpdatePersistentProcessInfo(int pid);
+  bool ShouldTakeFullDump(const ProcessInfo* process);
+  void SerializeSnapshot();
+  void SerializePersistentProcessInfo();
+  void Cleanup();
+
+  int self_pid_;
+  int dump_count_;
+  bool graphics_stats_ = false;
+  bool print_smaps_ = false;
+  FullDumpMode full_dump_mode_ = FullDumpMode::kDisabled;
+  std::set<std::string> full_dump_whitelist_;
+
+  FILE* out_;
+  ProcessMap processes_;
+  ProcessSnapshotMap snapshot_;
+  uint64_t snapshot_timestamp_;
+  std::set<int> full_dump_whitelisted_pids_;
+  std::unique_ptr<time_utils::PeriodicTimer> dump_timer_;
+};
+
+#endif  // ATRACE_PROCESS_DUMP_H_