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/***************************************************************************
* __________ __ ___.
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
* \/ \/ \/ \/ \/
* $Id$
*
* Copyright (C) 2011 Thomas Martitz
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
* KIND, either express or implied.
*
****************************************************************************/
#include <sys/times.h>
#include <sys/sysinfo.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <time.h>
#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>
#include <ctype.h>
#include "kernel.h"
#include "thread.h"
#include "cpuinfo-linux.h"
#include "gcc_extensions.h"
#undef open /* want the *real* open here, not sim_open or the like */
#if (CONFIG_PLATFORM & PLATFORM_ANDROID)
#include "cpu-features.h"
#define get_nprocs android_getCpuCount
#endif
#define NUM_SAMPLES 64
#define NUM_SAMPLES_MASK (NUM_SAMPLES-1)
#define SAMPLE_RATE 4
struct cputime_sample {
struct tms sample;
time_t time;
};
static struct cputime_sample samples[NUM_SAMPLES];
static int current_sample;
static int samples_taken;
static clock_t initial_time, hz;
static char cputime_thread_stack[DEFAULT_STACK_SIZE + 0x100];
static char cputime_thread_name[] = "cputime";
static int cputime_threadid;
static void cputime_thread(void);
/* times() can return -1 early after boot */
static clock_t times_wrapper(struct tms *t)
{
clock_t res = times(t);
if (res == (clock_t)-1)
res = time(NULL) * hz;
return res;
}
static inline void thread_func(void)
{
struct cputime_sample *s = &samples[current_sample++];
s->time = times_wrapper(&s->sample);
current_sample &= NUM_SAMPLES_MASK;
if (samples_taken < NUM_SAMPLES) samples_taken++;
sleep(HZ/SAMPLE_RATE);
}
static void NORETURN_ATTR cputime_thread(void)
{
while(1)
thread_func();
}
static void __attribute__((constructor)) get_initial_time(void)
{
struct tms ign;
hz = sysconf(_SC_CLK_TCK);
initial_time = times_wrapper(&ign); /* dont pass NULL */;
}
int cpuusage_linux(struct cpuusage* u)
{
if (UNLIKELY(!cputime_threadid))
{
/* collect some initial data and start the thread */
thread_func();
cputime_threadid = create_thread(cputime_thread, cputime_thread_stack,
sizeof(cputime_thread_stack), 0, cputime_thread_name
IF_PRIO(,PRIORITY_BACKGROUND) IF_COP(, CPU));
}
if (!u)
return -1;
clock_t total_cputime;
clock_t diff_utime, diff_stime;
time_t diff_rtime;
int latest_sample = ((current_sample == 0) ? NUM_SAMPLES : current_sample) - 1;
int oldest_sample = (samples_taken < NUM_SAMPLES) ? 0 : current_sample;
diff_utime = samples[latest_sample].sample.tms_utime - samples[oldest_sample].sample.tms_utime;
diff_stime = samples[latest_sample].sample.tms_stime - samples[oldest_sample].sample.tms_stime;
diff_rtime = samples[latest_sample].time - samples[oldest_sample].time;
if (UNLIKELY(!diff_rtime))
diff_rtime = 1;
u->hz = hz;
u->utime = samples[latest_sample].sample.tms_utime;
u->stime = samples[latest_sample].sample.tms_stime;
u->rtime = samples[latest_sample].time - initial_time;
total_cputime = diff_utime + diff_stime;
total_cputime *= 100; /* pump up by 100 for hundredth */
u->usage = total_cputime * 100 / diff_rtime;
return 0;
}
int cpucount_linux(void)
{
return get_nprocs();
}
int frequency_linux(int cpu, bool scaling)
{
char path[64];
char temp[10];
int cpu_dev, ret = -1;
snprintf(path, sizeof(path),
"/sys/devices/system/cpu/cpu%d/cpufreq/%s_cur_freq",
cpu, scaling ? "scaling" : "cpuinfo");
cpu_dev = open(path, O_RDONLY);
if (cpu_dev < 0)
return -1;
if (read(cpu_dev, temp, sizeof(temp)) >= 0)
ret = atoi(temp);
close(cpu_dev);
return ret;
}
int cpustatetimes_linux(int cpu, struct time_state* data, int max_elements)
{
int elements_left = max_elements, cpu_dev;
char buf[256], path[64], *p;
ssize_t read_size;
snprintf(path, sizeof(path), "/sys/devices/system/cpu/cpu%d/cpufreq/stats/time_in_state", cpu);
cpu_dev = open(path, O_RDONLY);
if (cpu_dev < 0)
return -1;
read_size = read(cpu_dev, buf, sizeof(buf));
close(cpu_dev);
p = buf;
while(elements_left > 0 && (p-buf) < read_size)
{
data->frequency = atol(p);
/* this loop breaks when it seems the space or line-feed,
* so buf points to a number aftwards */
while(isdigit(*p++));
data->time = atol(p);
/* now skip over to the next line */
while(isdigit(*p++));
data++;
elements_left--;
}
return (max_elements - elements_left) ?: -1;
}
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