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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.
*/
/*
* System Accounting
*/
#include <sys/sched.h>
#include <sys/schedvar.h>
#include <sys/proc.h>
#include <fs/ctlfs.h>
#include <machine/cpu.h>
#include <string.h>
/* Called within kern_sched.c */
void sched_accnt_init(void);
static struct ctlops sched_stat_ctl;
volatile size_t g_nthreads;
static int
ctl_stat_read(struct ctlfs_dev *cdp, struct sio_txn *sio)
{
struct sched_stat stat;
if (sio->len > sizeof(stat)) {
sio->len = sizeof(stat);
}
sched_stat(&stat);
memcpy(sio->buf, &stat, sio->len);
return sio->len;
}
/*
* Get scheduler accounting information
*
* @statp: Info gets copied here
*/
void
sched_stat(struct sched_stat *statp)
{
struct sched_cpu *cpustat;
statp->nproc = atomic_load_64(&g_nthreads);
statp->ncpu = cpu_count();
statp->quantum_usec = DEFAULT_TIMESLICE_USEC;
/*
* Setup the per-cpu info/statistics
*/
for (int i = 0; i < CPU_MAX; ++i) {
cpustat = cpu_get_stat(i);
if (cpustat == NULL) {
break;
}
statp->cpus[i] = *cpustat;
}
}
void
sched_accnt_init(void)
{
char devname[] = "sched";
struct ctlfs_dev ctl;
/*
* Register some accounting information in
* '/ctl/sched/stat'
*/
ctl.mode = 0444;
ctlfs_create_node(devname, &ctl);
ctl.devname = devname;
ctl.ops = &sched_stat_ctl;
ctlfs_create_entry("stat", &ctl);
}
static struct ctlops sched_stat_ctl = {
.read = ctl_stat_read,
.write = NULL
};
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