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/**************************************************************************
*
* Copyright 2013 Marek Olšák <maraeo@gmail.com>
* All Rights Reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sub license, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice (including the
* next paragraph) shall be included in all copies or substantial portions
* of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
* IN NO EVENT SHALL THE AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR
* ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*
**************************************************************************/
/* This file contains code for reading CPU load for displaying on the HUD.
*/
#include "hud/hud_private.h"
#include "os/os_time.h"
#include "util/u_memory.h"
#include <stdio.h>
static boolean
get_cpu_stats(unsigned cpu_index, uint64_t *busy_time, uint64_t *total_time)
{
char cpuname[32];
char line[1024];
FILE *f;
if (cpu_index == ALL_CPUS)
strcpy(cpuname, "cpu");
else
sprintf(cpuname, "cpu%u", cpu_index);
f = fopen("/proc/stat", "r");
if (!f)
return FALSE;
while (!feof(f) && fgets(line, sizeof(line), f)) {
if (strstr(line, cpuname) == line) {
uint64_t v[12];
int i, num;
num = sscanf(line,
"%s %llu %llu %llu %llu %llu %llu %llu %llu %llu "
"%llu %llu %llu",
cpuname, &v[0], &v[1], &v[2], &v[3], &v[4], &v[5],
&v[6], &v[7], &v[8], &v[9], &v[10], &v[11]);
if (num < 5) {
fclose(f);
return FALSE;
}
/* user + nice + system */
*busy_time = v[0] + v[1] + v[2];
*total_time = *busy_time;
/* ... + idle + iowait + irq + softirq + ... */
for (i = 3; i < num-1; i++) {
*total_time += v[i];
}
fclose(f);
return TRUE;
}
}
fclose(f);
return FALSE;
}
struct cpu_info {
unsigned cpu_index;
uint64_t last_cpu_busy, last_cpu_total, last_time;
};
static void
query_cpu_load(struct hud_graph *gr)
{
struct cpu_info *info = gr->query_data;
uint64_t now = os_time_get();
if (info->last_time) {
if (info->last_time + gr->pane->period <= now) {
uint64_t cpu_busy, cpu_total, cpu_load;
get_cpu_stats(info->cpu_index, &cpu_busy, &cpu_total);
cpu_load = (cpu_busy - info->last_cpu_busy) * 100 /
(double)(cpu_total - info->last_cpu_total);
hud_graph_add_value(gr, cpu_load);
info->last_cpu_busy = cpu_busy;
info->last_cpu_total = cpu_total;
info->last_time = now;
}
}
else {
/* initialize */
info->last_time = now;
get_cpu_stats(info->cpu_index, &info->last_cpu_busy,
&info->last_cpu_total);
}
}
void
hud_cpu_graph_install(struct hud_pane *pane, unsigned cpu_index)
{
struct hud_graph *gr;
struct cpu_info *info;
uint64_t busy, total;
/* see if the cpu exists */
if (cpu_index != ALL_CPUS && !get_cpu_stats(cpu_index, &busy, &total)) {
return;
}
gr = CALLOC_STRUCT(hud_graph);
if (!gr)
return;
if (cpu_index == ALL_CPUS)
strcpy(gr->name, "cpu");
else
sprintf(gr->name, "cpu%u", cpu_index);
gr->query_data = CALLOC_STRUCT(cpu_info);
if (!gr->query_data) {
FREE(gr);
return;
}
gr->query_new_value = query_cpu_load;
gr->free_query_data = free;
info = gr->query_data;
info->cpu_index = cpu_index;
hud_pane_add_graph(pane, gr);
hud_pane_set_max_value(pane, 100);
}
int
hud_get_num_cpus(void)
{
uint64_t busy, total;
int i = 0;
while (get_cpu_stats(i, &busy, &total))
i++;
return i;
}
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