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/* -*- tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
#include <config.h>
#include <glib.h>
#include <glibtop.h>
#include <glibtop/proctime.h>
#include <glibtop/cpu.h>
#include "smooth_refresh.h"
#include "application.h"
#include "settings-keys.h"
#include "util.h"
const string SmoothRefresh::KEY(GSM_SETTING_SMOOTH_REFRESH);
unsigned SmoothRefresh::get_own_cpu_usage()
{
glibtop_cpu cpu;
glibtop_proc_time proctime;
guint64 elapsed;
unsigned usage = PCPU_LO;
glibtop_get_cpu (&cpu);
elapsed = cpu.total - this->last_total_time;
if (elapsed) { // avoid division by 0
glibtop_get_proc_time(&proctime, getpid());
usage = (proctime.rtime - this->last_cpu_time) * 100 / elapsed;
this->last_cpu_time = proctime.rtime;
}
usage = CLAMP(usage, 0, 100);
this->last_total_time = cpu.total;
return usage;
}
void SmoothRefresh::load_settings_value(Glib::ustring key)
{
this->active = this->settings->get_boolean(key);
if (this->active)
procman_debug("smooth_refresh is enabled");
}
SmoothRefresh::SmoothRefresh(Glib::RefPtr<Gio::Settings> a_settings)
:
settings(a_settings),
active(false),
interval(0),
last_pcpu(0),
last_total_time(0ULL),
last_cpu_time(0ULL)
{
this->connection = a_settings->signal_changed("smooth_refresh").connect([this](const Glib::ustring& key) { this->load_settings_value(key); });
this->reset();
this->load_settings_value(KEY);
}
void SmoothRefresh::reset()
{
glibtop_cpu cpu;
glibtop_proc_time proctime;
glibtop_get_cpu(&cpu);
glibtop_get_proc_time(&proctime, getpid());
this->interval = GsmApplication::get()->config.update_interval;
this->last_pcpu = PCPU_LO;
this->last_total_time = cpu.total;
this->last_cpu_time = proctime.rtime;
}
SmoothRefresh::~SmoothRefresh()
{
if (this->connection)
this->connection.disconnect();
}
bool
SmoothRefresh::get(guint &new_interval)
{
const unsigned config_interval = GsmApplication::get()->config.update_interval;
g_assert(this->interval >= config_interval);
if (not this->active)
return false;
const unsigned pcpu = this->get_own_cpu_usage();
/*
invariant: MAX_UPDATE_INTERVAL >= interval >= config_interval >= MIN_UPDATE_INTERVAL
i see 3 cases:
a) interval is too big (CPU usage < 10%)
-> increase interval
b) interval is too small (CPU usage > 10%) AND interval != config_interval
>
-> decrease interval
c) interval is config_interval (start or interval is perfect)
*/
if (pcpu > PCPU_HI && this->last_pcpu > PCPU_HI)
new_interval = this->interval * 11 / 10;
else if (this->interval != config_interval && pcpu < PCPU_LO && this->last_pcpu < PCPU_LO)
new_interval = this->interval * 9 / 10;
else
new_interval = this->interval;
new_interval = CLAMP(new_interval, config_interval, config_interval * 2);
new_interval = CLAMP(new_interval, MIN_UPDATE_INTERVAL, MAX_UPDATE_INTERVAL);
bool changed = this->interval != new_interval;
if (changed)
this->interval = new_interval;
this->last_pcpu = pcpu;
if (changed) {
procman_debug("CPU usage is %3u%%, changed refresh_interval to %u (config %u)",
this->last_pcpu,
this->interval,
config_interval);
}
g_assert(this->interval == new_interval);
g_assert(this->interval >= config_interval);
return changed;
}
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