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/*
* Copyright (c) 2009, Jay Loden, Giampaolo Rodola'. All rights reserved.
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
/*
System-wide CPU related functions.
Original code was refactored and moved from psutil/arch/freebsd/specific.c
in 2020 (and was moved in there previously already) from cset.
a4c0a0eb0d2a872ab7a45e47fcf37ef1fde5b012
For reference, here's the git history with original(ish) implementations:
- CPU stats: fb0154ef164d0e5942ac85102ab660b8d2938fbb
- CPU freq: 459556dd1e2979cdee22177339ced0761caf4c83
- CPU cores: e0d6d7865df84dc9a1d123ae452fd311f79b1dde
*/
#include <Python.h>
#include <sys/sysctl.h>
#include <devstat.h>
#include "../../arch/all/init.h"
PyObject *
psutil_per_cpu_times(PyObject *self, PyObject *args) {
int maxcpus;
int mib[2];
int ncpu;
size_t size;
PyObject *py_retlist = PyList_New(0);
PyObject *py_cputime = NULL;
if (py_retlist == NULL)
return NULL;
// retrieve the number of CPUs currently online
mib[0] = CTL_HW;
mib[1] = HW_NCPU;
if (psutil_sysctl(mib, 2, &ncpu, sizeof(ncpu)) != 0) {
goto error;
}
// allocate buffer dynamically based on actual CPU count
long (*cpu_time)[CPUSTATES] = malloc(ncpu * sizeof(*cpu_time));
if (!cpu_time) {
PyErr_NoMemory();
goto error;
}
// get per-cpu times using ncpu count
size = ncpu * sizeof(*cpu_time);
if (psutil_sysctlbyname("kern.cp_times", cpu_time, size) == -1) {
free(cpu_time);
goto error;
}
for (int i = 0; i < ncpu; i++) {
py_cputime = Py_BuildValue(
"(ddddd)",
(double)cpu_time[i][CP_USER] / CLOCKS_PER_SEC,
(double)cpu_time[i][CP_NICE] / CLOCKS_PER_SEC,
(double)cpu_time[i][CP_SYS] / CLOCKS_PER_SEC,
(double)cpu_time[i][CP_IDLE] / CLOCKS_PER_SEC,
(double)cpu_time[i][CP_INTR] / CLOCKS_PER_SEC);
if (!py_cputime) {
free(cpu_time);
goto error;
}
if (PyList_Append(py_retlist, py_cputime)) {
Py_DECREF(py_cputime);
free(cpu_time);
goto error;
}
Py_DECREF(py_cputime);
}
free(cpu_time);
return py_retlist;
error:
Py_XDECREF(py_cputime);
Py_DECREF(py_retlist);
return NULL;
}
PyObject *
psutil_cpu_topology(PyObject *self, PyObject *args) {
char *topology = NULL;
size_t size = 0;
PyObject *py_str;
if (psutil_sysctlbyname_malloc(
"kern.sched.topology_spec", &topology, &size) != 0)
{
psutil_debug("ignore sysctlbyname('kern.sched.topology_spec') error");
Py_RETURN_NONE;
}
py_str = Py_BuildValue("s", topology);
free(topology);
return py_str;
}
PyObject *
psutil_cpu_stats(PyObject *self, PyObject *args) {
unsigned int v_soft;
unsigned int v_intr;
unsigned int v_syscall;
unsigned int v_trap;
unsigned int v_swtch;
size_t size = sizeof(v_soft);
if (psutil_sysctlbyname("vm.stats.sys.v_soft", &v_soft, size) != 0)
return NULL;
if (psutil_sysctlbyname("vm.stats.sys.v_intr", &v_intr, size) != 0)
return NULL;
if (psutil_sysctlbyname("vm.stats.sys.v_syscall", &v_syscall, size) != 0)
return NULL;
if (psutil_sysctlbyname("vm.stats.sys.v_trap", &v_trap, size) != 0)
return NULL;
if (psutil_sysctlbyname("vm.stats.sys.v_swtch", &v_swtch, size) != 0)
return NULL;
return Py_BuildValue(
"IIIII",
v_swtch, // ctx switches
v_intr, // interrupts
v_soft, // software interrupts
v_syscall, // syscalls
v_trap // traps
);
}
/*
* Return frequency information of a given CPU.
* As of Dec 2018 only CPU 0 appears to be supported and all other
* cores match the frequency of CPU 0.
*/
PyObject *
psutil_cpu_freq(PyObject *self, PyObject *args) {
int current;
int core;
char sensor[26];
char available_freq_levels[1000];
size_t size;
if (! PyArg_ParseTuple(args, "i", &core))
return NULL;
// https://www.unix.com/man-page/FreeBSD/4/cpufreq/
size = sizeof(current);
sprintf(sensor, "dev.cpu.%d.freq", core);
if (psutil_sysctlbyname(sensor, ¤t, size) != 0)
goto error;
// In case of failure, an empty string is returned.
size = sizeof(available_freq_levels);
sprintf(sensor, "dev.cpu.%d.freq_levels", core);
if (psutil_sysctlbyname(sensor, &available_freq_levels, size) != 0)
psutil_debug("cpu freq levels failed (ignored)");
return Py_BuildValue("is", current, available_freq_levels);
error:
if (errno == ENOENT)
PyErr_SetString(PyExc_NotImplementedError, "unable to read frequency");
else
PyErr_SetFromErrno(PyExc_OSError);
return NULL;
}
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