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/****************************************************************************
**
** Copyright (C) 2016 Pelagicore AG
** Contact: https://www.qt.io/licensing/
**
** This file is part of the Pelagicore Application Manager.
**
** $QT_BEGIN_LICENSE:LGPL-QTAS$
** Commercial License Usage
** Licensees holding valid commercial Qt Automotive Suite licenses may use
** this file in accordance with the commercial license agreement provided
** with the Software or, alternatively, in accordance with the terms
** contained in a written agreement between you and The Qt Company. For
** licensing terms and conditions see https://www.qt.io/terms-conditions.
** For further information use the contact form at https://www.qt.io/contact-us.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 3 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL3 included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 3 requirements
** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 2.0 or (at your option) the GNU General
** Public license version 3 or any later version approved by the KDE Free
** Qt Foundation. The licenses are as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
** included in the packaging of this file. Please review the following
** information to ensure the GNU General Public License requirements will
** be met: https://www.gnu.org/licenses/gpl-2.0.html and
** https://www.gnu.org/licenses/gpl-3.0.html.
**
** $QT_END_LICENSE$
**
** SPDX-License-Identifier: LGPL-3.0
**
****************************************************************************/
#include "startuptimer.h"
#include "utilities.h"
#if defined(Q_OS_WIN)
# include <windows.h>
# include <io.h>
# define isatty _isatty
#elif defined(Q_OS_LINUX)
# include <time.h>
# include <qplatformdefs.h>
# include <sys/syscall.h>
#elif defined(Q_OS_OSX)
# include <unistd.h>
# include <sys/sysctl.h>
#endif
StartupTimer::StartupTimer()
{
QByteArray useTimer = qgetenv("AM_STARTUP_TIMER");
if (useTimer.isNull())
return;
else if (useTimer.isEmpty() || useTimer == "1")
m_output = stderr;
else
m_output = fopen(useTimer, "w");
#if defined(Q_OS_WIN)
// Windows reports FILETIMEs in 100nsec steps: divide by 10 to get usec
auto winFileTimeToUSec = [](const FILETIME &filetime) {
return ((quint64(filetime.dwHighDateTime) << 32) | quint64(filetime.dwLowDateTime)) / 10;
};
FILETIME creationTime, dummy, now;
if (GetProcessTimes(GetCurrentProcess(), &creationTime, &dummy, &dummy, &dummy)) {
GetSystemTimeAsFileTime(&now);
m_processCreation = (winFileTimeToUSec(now) - winFileTimeToUSec(creationTime));
m_initialized = true;
} else {
qWarning("StartupTimer: could not get process creation time");
}
#elif defined(Q_OS_LINUX)
// Linux is stupid: there's only one way to get your own process' start time with a high
// resolution: using the async netlink protocol to get a 'taskstat', but this is highly complex
// and requires root privileges.
// And then there's /proc/self/task/<gettid>/stat which gives you the "jiffies" at creation
// time, but no reference to compare it to (plus its resolution is very coarse).
// The following implements the idea from the Mozilla team to get a stable reference for this
// jiffie value: https://blog.mozilla.org/tglek/2011/01/14/builtin-startup-measurement/
// This will give you roughly a 10ms resolution for the time from process creation to entering
// main(), depending on your kernel's HZ value.
// really bool (*)(quint32 *result), but casting the lambda does not work
auto readJiffiesFromProc = [](void *resultPtr) -> void * {
void *result = 0;
QByteArray file = "/proc/self/task/" + QByteArray::number((int) syscall(SYS_gettid)) + "/stat";
int fd = QT_OPEN(file, O_RDONLY);
if (fd >= 0) {
char buffer[1024];
ssize_t bytesRead = QT_READ(fd, buffer, sizeof(buffer) - 1);
if (bytesRead > 0) {
buffer[bytesRead] = 0;
for (int field = 0, pos = 0; pos < bytesRead; ) {
if (buffer[pos++] == ' ') {
if (++field == 21) {
*reinterpret_cast<quint32 *>(resultPtr) = strtoul(buffer + pos, 0, 10);
result = reinterpret_cast<void *>(1);
break;
}
}
}
}
QT_CLOSE(fd);
}
return result;
};
quint32 threadJiffies;
pthread_t pt;
void *threadJiffiesOk = 0;
// using clone() with CLONE_VFORK would be more efficient, but it messes up the NPTL internal state
if ((pthread_create(&pt, 0, readJiffiesFromProc, &threadJiffies) == 0)
&& (pthread_join(pt, &threadJiffiesOk) == 0)
&& threadJiffiesOk) {
quint32 processJiffies = 0;
if (readJiffiesFromProc(&processJiffies)) {
int clkTck = sysconf(_SC_CLK_TCK);
if (clkTck > 0) {
m_processCreation = (threadJiffies - processJiffies) * 1000*1000 / clkTck;
m_initialized = true;
} else {
qWarning("StartupTimer: could not get _SC_CLK_TCK");
}
} else {
qWarning("StartupTimer: could not read process creation jiffies");
}
} else {
qWarning("StartupTimer: could not read thread creation jiffies");
}
#elif defined(Q_OS_OSX)
int mibNames[] = { CTL_KERN, KERN_PROC, KERN_PROC_PID, getpid() };
size_t procInfoSize;
if (sysctl(mibNames, sizeof(mibNames) / sizeof(mibNames[0]), 0, &procInfoSize, 0, 0) == 0) {
kinfo_proc *procInfo = (kinfo_proc *) malloc(procInfoSize);
if (sysctl(mibNames, sizeof(mibNames) / sizeof(mibNames[0]), procInfo, &procInfoSize, 0, 0) == 0) {
struct timeval now;
if (gettimeofday(&now, 0) == 0) {
m_processCreation = (quint64(now.tv_sec) * 1000000 + now.tv_usec)
- (procInfo->kp_proc.p_un.__p_starttime.tv_sec * 1000000 + procInfo->kp_proc.p_un.__p_starttime.tv_usec);
m_initialized = true;
}
} else {
qWarning("StartupTimer: could not get kinfo_proc from kernel");
}
free(procInfo);
} else {
qWarning("StartupTimer: could not get size of kinfo_proc buffer");
}
#else
qWarning("StartupTimer: not implemented on this platform");
m_initialized = false;
#endif
if (m_initialized) {
m_timer.start();
checkpoint("entered main");
}
}
StartupTimer::~StartupTimer()
{
if (m_output && m_output != stderr)
fclose(m_output);
}
void StartupTimer::checkpoint(const char *name)
{
if (Q_UNLIKELY(m_initialized)) {
qint64 delta = m_timer.nsecsElapsed();
m_checkpoints << qMakePair(delta / 1000 + m_processCreation, name);
}
}
void StartupTimer::createReport() const
{
if (m_output) {
bool colorSupport = canOutputAnsiColors(fileno(m_output));
if (colorSupport) {
fprintf(m_output, "\n\033[33m== STARTUP TIMING REPORT ==\033[0m\n");
} else {
fprintf(m_output, "\n== STARTUP TIMING REPORT ==\n");
}
static const int cols = 120;
static const int barCols = 60;
int delta = m_checkpoints.last().first;
qreal usecPerCell = delta / barCols;
int secondsLength = QByteArray::number(delta / 1000000).length();
for (int i = 0; i < m_checkpoints.size(); ++i) {
quint64 usec = m_checkpoints.at(i).first;
const QByteArray text = m_checkpoints.at(i).second;
int sec = 0;
int cells = usec / usecPerCell;
QByteArray bar(cells, colorSupport ? ' ' : '#');
QByteArray spacing(cols - cells - 2 - secondsLength - 8 - text.length(), ' ');
if (usec > 1000*1000) {
sec = usec / (1000*1000);
usec %= (1000*1000);
}
int msec = usec / 1000;
usec %= 1000;
if (colorSupport) {
fprintf(m_output, "\033[32m%d'%03d.%03d\033[0m %s %s\033[44m %s\033[0m\n", sec, msec, int(usec), text.constData(), spacing.constData(), bar.constData());
} else {
fprintf(m_output, "%d'%03d.%03d %s %s#%s\n", sec, msec, int(usec), text.constData(), spacing.constData(), bar.constData());
}
}
fprintf(m_output, "\n");
fflush(m_output);
}
}
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