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README.md

      1 <!-- Copyright 2017 The Chromium Authors. All rights reserved.
      2      Use of this source code is governed by a BSD-style license that can be
      3      found in the LICENSE file.
      4 -->
      5 atrace_helper is an optional binary which can be pushed onto the device running
      6 systrace in order to enrich the traces with further details (memory, I/O, etc).
      7 
      8 Which problem is it solving?
      9 ---------------------------
     10 Some nice-to-have details are not present in the systrace, specifically:
     11  - Memory snapshots of running processes (PSS/RSS).
     12  - Periodic snapshotting of processes and thread names.
     13  - File paths for filesystem events (today they report only inode numbers).
     14 
     15 How is it solving it?
     16 ---------------------
     17 atrace_helper is a small userspace binary which is meant to be pushed on the
     18 device and run together with atrace by a dedicated tracing agent. When stopped,
     19 the helper produces a JSON file which contains all the relevant details
     20 (see --help). The JSON file is consumed by the TraceViewer importers and the
     21 extra details are merged into the final model.
     22 
     23 Build instructions
     24 ------------------
     25 Building the binary requires the Android NDK to be installed. See
     26 [Android NDK page](https://developer.android.com/ndk).
     27 Once installed the binary can be just built as follows:
     28 `$(NDK_HOME)/ndk-build`
     29 The binary will be built in `libs/armeabi-v7a/`
     30