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

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/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
This commit is contained in:
Luis Hector Chavez 2018-04-11 15:35:44 -07:00
parent af15fbf9aa
commit 2980f57f2c
1 changed files with 5 additions and 3 deletions
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8
init/bootchart.cpp
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@ -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,