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Commit 2980f57f authored by Luis Hector Chavez's avatar Luis Hector Chavez
Browse files

init: Use android::base::boot_clock instead of /proc/uptime 

/proc/uptime internally uses whatever would be returned by
clock_gettime(CLOCK_BOOTTIME), so use android::base::boot_clock instead
which avoids parsing strings and rounding errors.

Bug: 77273909
Test: CtsBootStatsTestCases
Change-Id: Ic162eefcf226073949a18cca55db3c2324b98749
parent af15fbf9

init/bootchart.cpp

+5 −3
Original line number Diff line number Diff line
@@ -32,12 +32,14 @@ 
#include <mutex>

#include <thread>



#include <android-base/chrono_utils.h>

#include <android-base/file.h>

#include <android-base/logging.h>

#include <android-base/properties.h>

#include <android-base/stringprintf.h>



using android::base::StringPrintf;

using android::base::boot_clock;

using namespace std::chrono_literals;



namespace android {
@@ -50,9 +52,9 @@ static std::condition_variable g_bootcharting_finished_cv; 
static bool g_bootcharting_finished;



static long long get_uptime_jiffies() {

  std::string uptime;

  if (!android::base::ReadFileToString("/proc/uptime", &uptime)) return 0;

  return 100LL * strtod(uptime.c_str(), NULL);

    constexpr int64_t kNanosecondsPerJiffy = 10000000;

    boot_clock::time_point uptime = boot_clock::now();

    return uptime.time_since_epoch().count() / kNanosecondsPerJiffy;

}



static std::unique_ptr<FILE, decltype(&fclose)> fopen_unique(const char* filename,