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Commit 10f54be6 authored by James Hawkins's avatar James Hawkins
Browse files

bootstat: Add support for logging the boot_reason metric. 

This value is read from the ro.boot.bootreason system property.

Bug: 21724738
Change-Id: I43bef3d85ba9c8d87669a91da1aa675d9a86e348
(cherry picked from commit a4a1a4ac)
parent 91369220

bootstat/Android.mk

+1 −0
Original line number Diff line number Diff line
@@ -32,6 +32,7 @@ bootstat_test_src_files := \ 


bootstat_shared_libs := \

        libbase \

        libcutils \

        liblog



bootstat_cflags := \

bootstat/README.md

+5 −4
Original line number Diff line number Diff line
@@ -7,10 +7,11 @@ analysis. 


    Usage: bootstat [options]

    options include:

      -d              Dump the boot event records to the console.

      -h              Show this help.

      -l              Log all metrics to logstorage.

      -r              Record the relative time of a named boot event.

      -h, --help            Show this help

      -l, --log             Log all metrics to logstorage

      -p, --print           Dump the boot event records to the console

      -r, --record          Record the timestamp of a named boot event

      --record_boot_reason  Record the reason why the device booted



## Relative time ##

bootstat/boot_event_record_store.cpp

+15 −3
Original line number Diff line number Diff line
@@ -56,19 +56,31 @@ void BootEventRecordStore::AddBootEvent(const std::string& name) { 
    LOG(ERROR) << "Failed to read /proc/uptime";

  }



  // Cast intentionally rounds down.

  int32_t uptime = static_cast<int32_t>(strtod(uptime_str.c_str(), NULL));

  AddBootEventWithValue(name, uptime);

}



// The implementation of AddBootEventValue makes use of the mtime file

// attribute to store the value associated with a boot event in order to

// optimize on-disk size requirements and small-file thrashing.

void BootEventRecordStore::AddBootEventWithValue(

    const std::string& name, int32_t value) {

  std::string record_path = GetBootEventPath(name);

  if (creat(record_path.c_str(), S_IRUSR | S_IWUSR) == -1) {

    PLOG(ERROR) << "Failed to create " << record_path;

  }



  // Fill out the stat structure for |record_path| in order to get the atime to

  // set in the utime() call.

  struct stat file_stat;

  if (stat(record_path.c_str(), &file_stat) == -1) {

    PLOG(ERROR) << "Failed to read " << record_path;

  }



  // Cast intentionally rounds down.

  time_t uptime = static_cast<time_t>(strtod(uptime_str.c_str(), NULL));

  struct utimbuf times = {file_stat.st_atime, uptime};

  // Set the |modtime| of the file to store the value of the boot event while

  // preserving the |actime| (as read by stat).

  struct utimbuf times = {/* actime */ file_stat.st_atime, /* modtime */ value};

  if (utime(record_path.c_str(), &times) == -1) {

    PLOG(ERROR) << "Failed to set mtime for " << record_path;

  }

bootstat/boot_event_record_store.h

+5 −0
Original line number Diff line number Diff line
@@ -37,6 +37,10 @@ class BootEventRecordStore { 
  // Persists the boot event named |name| in the record store.

  void AddBootEvent(const std::string& name);



  // Persists the boot event named |name| with the associated |value| in the

  // record store.

  void AddBootEventWithValue(const std::string& name, int32_t value);



  // Returns a list of all of the boot events persisted in the record store.

  std::vector<BootEventRecord> GetAllBootEvents() const;
@@ -45,6 +49,7 @@ class BootEventRecordStore { 
  // more test-friendly path.

  FRIEND_TEST(BootEventRecordStoreTest, AddSingleBootEvent);

  FRIEND_TEST(BootEventRecordStoreTest, AddMultipleBootEvents);

  FRIEND_TEST(BootEventRecordStoreTest, AddBootEventWithValue);



  // Sets the filesystem path of the record store.

  void SetStorePath(const std::string& path);

bootstat/boot_event_record_store_test.cpp

+12 −0
Original line number Diff line number Diff line
@@ -154,3 +154,15 @@ TEST_F(BootEventRecordStoreTest, AddMultipleBootEvents) { 
    EXPECT_TRUE(FuzzUptimeEquals(uptime, *i));

  }

}



TEST_F(BootEventRecordStoreTest, AddBootEventWithValue) {

  BootEventRecordStore store;

  store.SetStorePath(GetStorePathForTesting());



  store.AddBootEventWithValue("permian", 42);



  auto events = store.GetAllBootEvents();

  ASSERT_EQ(1U, events.size());

  EXPECT_EQ("permian", events[0].first);

  EXPECT_EQ(42, events[0].second);

}
 
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