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platform_system_core
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Make bootstat container-friendly 

This change allows bootstat to read the ro.boot.boottime_offset
property, which is set on devices where Android runs in a container.
This is because the CLOCK_BOOTTIME clock is not reset when (from
Android's perspective) the device restarts, since the host OS does not
restart itself.

Bug: 77273909
Test: CtsBootStatsTestCases

Change-Id: Ifb792864394be0b4686cc9d555c0afced856f4b4
This commit is contained in:
Luis Hector Chavez 2018-04-12 15:25:15 -07:00
parent 14eb61199e
commit 583d34c1c6
1 changed files with 23 additions and 7 deletions
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30
bootstat/bootstat.cpp
View File

@ -36,6 +36,7 @@
#include <android-base/file.h>
#include <android-base/logging.h>
#include <android-base/parseint.h>
#include <android-base/properties.h>
#include <android-base/strings.h>
#include <android/log.h>
#include <cutils/android_reboot.h>
@ -957,14 +958,28 @@ void SetSystemBootReason() {
SetProperty(system_reboot_reason_property, system_boot_reason);
}
// Gets the boot time offset. This is useful when Android is running in a
// container, because the boot_clock is not reset when Android reboots.
std::chrono::nanoseconds GetBootTimeOffset() {
static const int64_t boottime_offset =
android::base::GetIntProperty<int64_t>("ro.boot.boottime_offset", 0);
return std::chrono::nanoseconds(boottime_offset);
}
// Returns the current uptime, accounting for any offset in the CLOCK_BOOTTIME
// clock.
android::base::boot_clock::duration GetUptime() {
return android::base::boot_clock::now().time_since_epoch() - GetBootTimeOffset();
}
// Records several metrics related to the time it takes to boot the device,
// including disambiguating boot time on encrypted or non-encrypted devices.
void RecordBootComplete() {
BootEventRecordStore boot_event_store;
BootEventRecordStore::BootEventRecord record;
auto time_since_epoch = android::base::boot_clock::now().time_since_epoch();
auto uptime = std::chrono::duration_cast<std::chrono::seconds>(time_since_epoch);
auto uptime_ns = GetUptime();
auto uptime_s = std::chrono::duration_cast<std::chrono::seconds>(uptime_ns);
time_t current_time_utc = time(nullptr);
time_t time_since_last_boot = 0;
@ -990,19 +1005,20 @@ void RecordBootComplete() {
// Log the amount of time elapsed until the device is decrypted, which
// includes the variable amount of time the user takes to enter the
// decryption password.
boot_event_store.AddBootEventWithValue("boot_decryption_complete", uptime.count());
boot_event_store.AddBootEventWithValue("boot_decryption_complete", uptime_s.count());
// Subtract the decryption time to normalize the boot cycle timing.
std::chrono::seconds boot_complete = std::chrono::seconds(uptime.count() - record.second);
std::chrono::seconds boot_complete = std::chrono::seconds(uptime_s.count() - record.second);
boot_event_store.AddBootEventWithValue(boot_complete_prefix + "_post_decrypt",
boot_complete.count());
} else {
boot_event_store.AddBootEventWithValue(boot_complete_prefix + "_no_encryption", uptime.count());
boot_event_store.AddBootEventWithValue(boot_complete_prefix + "_no_encryption",
uptime_s.count());
}
// Record the total time from device startup to boot complete, regardless of
// encryption state.
boot_event_store.AddBootEventWithValue(boot_complete_prefix, uptime.count());
boot_event_store.AddBootEventWithValue(boot_complete_prefix, uptime_s.count());
RecordInitBootTimeProp(&boot_event_store, "ro.boottime.init");
RecordInitBootTimeProp(&boot_event_store, "ro.boottime.init.selinux");
@ -1012,7 +1028,7 @@ void RecordBootComplete() {
int32_t bootloader_boot_duration = GetBootloaderTime(bootloader_timings);
RecordBootloaderTimings(&boot_event_store, bootloader_timings);
auto uptime_ms = std::chrono::duration_cast<std::chrono::milliseconds>(time_since_epoch);
auto uptime_ms = std::chrono::duration_cast<std::chrono::milliseconds>(uptime_ns);
auto absolute_boot_time = GetAbsoluteBootTime(bootloader_timings, uptime_ms);
RecordAbsoluteBootTime(&boot_event_store, absolute_boot_time);