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/*
* Copyright (c) 2023-2025 Ian Marco Moffett and the Osmora Team.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of Hyra nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#include <sys/sched.h>
#include <sys/vmstat.h>
#include <stdio.h>
#include <unistd.h>
#include <fcntl.h>
#define MIB_PER_GIB 1024
static void
print_size_mib(const char *name, size_t mib)
{
if (name == NULL) {
return;
}
if (mib >= MIB_PER_GIB) {
printf("%s: %d GiB\n", name, mib / MIB_PER_GIB);
} else {
printf("%s: %d MiB\n", name, mib);
}
}
static void
get_vm_stat(void)
{
struct vm_stat vmstat;
int retval, fd;
fd = open("/ctl/vm/stat", O_RDONLY);
if (fd < 0) {
printf("failed to open '/ctl/vm/stat'\n");
return;
}
retval = read(fd, &vmstat, sizeof(vmstat));
if (retval <= 0) {
printf("failed to read vmstat\n");
return;
}
close(fd);
print_size_mib("memory available", vmstat.mem_avail);
print_size_mib("memory used", vmstat.mem_used);
print_size_mib("memory total", vmstat.mem_total);
}
static void
get_sched_stat(void)
{
struct sched_stat stat;
struct sched_cpu *cpu;
double nonline, noffline;
uint16_t online_percent;
int fd;
fd = open("/ctl/sched/stat", O_RDONLY);
if (fd < 0) {
printf("failed to get sched stat\n");
return;
}
if (read(fd, &stat, sizeof(stat)) < 0) {
printf("failed to read sched stat\n");
return;
}
close(fd);
noffline = stat.nhlt;
nonline = (stat.ncpu - noffline);
online_percent = (uint16_t)(((double)nonline / (nonline + noffline)) * 100);
printf("number of tasks: %d\n", stat.nproc);
printf("number of cores online: %d\n", stat.ncpu);
printf("scheduler quantum: %d usec\n", stat.quantum_usec);
printf("CPU is %d%% online\n", online_percent);
/*
* Log out some per-cpu information
*/
for (int i = 0; i < stat.ncpu; ++i) {
cpu = &stat.cpus[i];
printf("[cpu %d]: %d switches\n", i, cpu->nswitch);
}
}
int
main(void)
{
printf("-- scheduler statistics --\n");
get_sched_stat();
printf("-- memory statistics --\n");
get_vm_stat();
return 0;
}
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