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WindowServer: Add a simple CPU usage graph to the global menu bar.

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This is pretty cute and helps me spot when something's chewing up CPU.
This commit is contained in:
Andreas Kling 2019-02-26 02:17:25 +01:00
parent b341cab9cc
commit 2fb3fa7f69
3 changed files with 75 additions and 13 deletions
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63
WindowServer/WSWindowManager.cpp
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@ -232,7 +232,7 @@ WSWindowManager::WSWindowManager()
static time_t last_update_time;
time_t now = time(nullptr);
if (now != last_update_time) {
invalidate(menubar_rect());
tick_clock();
last_update_time = now;
}
});
@ -245,6 +245,55 @@ WSWindowManager::~WSWindowManager()
{
}
static void get_cpu_usage(unsigned& busy, unsigned& idle)
{
busy = 0;
idle = 0;
FILE* fp = fopen("/proc/all", "r");
if (!fp) {
perror("failed to open /proc/all");
exit(1);
}
for (;;) {
char buf[BUFSIZ];
char* ptr = fgets(buf, sizeof(buf), fp);
if (!ptr)
break;
auto parts = String(buf, Chomp).split(',');
if (parts.size() < 17)
break;
bool ok;
pid_t pid = parts[0].to_uint(ok);
ASSERT(ok);
unsigned nsched = parts[1].to_uint(ok);
ASSERT(ok);
if (pid == 0)
idle += nsched;
else
busy += nsched;
}
int rc = fclose(fp);
ASSERT(rc == 0);
}
void WSWindowManager::tick_clock()
{
static unsigned last_busy;
static unsigned last_idle;
unsigned busy;
unsigned idle;
get_cpu_usage(busy, idle);
unsigned busy_diff = busy - last_busy;
unsigned idle_diff = idle - last_idle;
last_busy = busy;
last_idle = idle;
float cpu = (float)busy_diff / (float)(busy_diff + idle_diff);
m_cpu_history.enqueue(cpu);
invalidate(menubar_rect());
}
void WSWindowManager::set_resolution(int width, int height)
{
if (m_screen_rect.width() == width && m_screen_rect.height() == height)
@ -866,6 +915,18 @@ void WSWindowManager::draw_menubar()
tm->tm_sec);
auto time_rect = menubar_rect().translated(-(menubar_menu_margin() / 2), 0);
m_back_painter->draw_text(time_rect, time_text, TextAlignment::CenterRight, Color::Black);
Rect cpu_rect { time_rect.right() - font().glyph_width() * time_text.length() - (int)m_cpu_history.capacity() - 10, time_rect.y() + 1, (int)m_cpu_history.capacity(), time_rect.height() - 2 };
m_back_painter->fill_rect(cpu_rect, Color::Black);
int i = m_cpu_history.capacity() - m_cpu_history.size();
for (auto cpu_usage : m_cpu_history) {
m_back_painter->draw_line(
{ cpu_rect.x() + i, cpu_rect.bottom() },
{ cpu_rect.x() + i, (int)(cpu_rect.y() + (cpu_rect.height() - (cpu_usage * (float)cpu_rect.height()))) },
Color(0, 200, 0)
);
++i;
}
}
void WSWindowManager::draw_cursor()