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#include <config.h>
#include <sys/types.h>
#include <unistd.h>
#include <glib.h>
#include <glibtop.h>
#include <glibtop/proctime.h>
#include <glibtop/cpu.h>
#include <algorithm>
#include "smooth_refresh.h"
#include "procman.h"
#include "util.h"
const string SmoothRefresh::KEY("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 = MIN (usage, 100);
this->last_total_time = cpu.total;
return usage;
}
void SmoothRefresh::status_changed(GSettings *settings,
const gchar *key,
gpointer user_data)
{
static_cast<SmoothRefresh*>(user_data)->load_settings_value(key);
}
void SmoothRefresh::load_settings_value(const gchar *key)
{
this->active = g_settings_get_boolean(settings, key);
if (this->active)
procman_debug("smooth_refresh is enabled");
}
SmoothRefresh::SmoothRefresh(GSettings *a_settings)
:
settings(a_settings)
{
this->connection = g_signal_connect(G_OBJECT(settings),
"changed::smooth-refresh",
G_CALLBACK(status_changed),
this);
this->reset();
this->load_settings_value(KEY.c_str());
}
void SmoothRefresh::reset()
{
glibtop_cpu cpu;
glibtop_proc_time proctime;
glibtop_get_cpu(&cpu);
glibtop_get_proc_time(&proctime, getpid());
this->interval = ProcData::get_instance()->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)
g_signal_handler_disconnect(G_OBJECT(settings), this->connection);
}
bool
SmoothRefresh::get(guint &new_interval)
{
const unsigned config_interval = ProcData::get_instance()->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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