diff options
Diffstat (limited to 'sys/vm/vm_meter.c')
| -rw-r--r-- | sys/vm/vm_meter.c | 228 |
1 files changed, 228 insertions, 0 deletions
diff --git a/sys/vm/vm_meter.c b/sys/vm/vm_meter.c new file mode 100644 index 00000000000..bcaf79423c3 --- /dev/null +++ b/sys/vm/vm_meter.c @@ -0,0 +1,228 @@ +/* $NetBSD: vm_meter.c,v 1.17 1995/07/08 03:12:22 cgd Exp $ */ + +/* + * Copyright (c) 1982, 1986, 1989, 1993 + * The Regents of the University of California. 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. All advertising materials mentioning features or use of this software + * must display the following acknowledgement: + * This product includes software developed by the University of + * California, Berkeley and its contributors. + * 4. Neither the name of the University 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 REGENTS 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 REGENTS 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. + * + * @(#)vm_meter.c 8.4 (Berkeley) 1/4/94 + */ + +#include <sys/param.h> +#include <sys/proc.h> +#include <sys/systm.h> +#include <sys/kernel.h> +#include <vm/vm.h> +#include <sys/sysctl.h> + +struct loadavg averunnable; /* load average, of runnable procs */ + +int maxslp = MAXSLP; +#ifndef MACHINE_NONCONTIG +int saferss = SAFERSS; +#endif /* MACHINE_NONCONTIG */ + +void +vmmeter() +{ + + if (time.tv_sec % 5 == 0) + loadav(&averunnable); + if (proc0.p_slptime > maxslp/2) + wakeup((caddr_t)&proc0); +} + +/* + * Constants for averages over 1, 5, and 15 minutes + * when sampling at 5 second intervals. + */ +fixpt_t cexp[3] = { + 0.9200444146293232 * FSCALE, /* exp(-1/12) */ + 0.9834714538216174 * FSCALE, /* exp(-1/60) */ + 0.9944598480048967 * FSCALE, /* exp(-1/180) */ +}; + +/* + * Compute a tenex style load average of a quantity on + * 1, 5 and 15 minute intervals. + */ +void +loadav(avg) + register struct loadavg *avg; +{ + register int i, nrun; + register struct proc *p; + + for (nrun = 0, p = allproc.lh_first; p != 0; p = p->p_list.le_next) { + switch (p->p_stat) { + case SSLEEP: + if (p->p_priority > PZERO || p->p_slptime > 1) + continue; + /* fall through */ + case SRUN: + case SIDL: + nrun++; + } + } + for (i = 0; i < 3; i++) + avg->ldavg[i] = (cexp[i] * avg->ldavg[i] + + nrun * FSCALE * (FSCALE - cexp[i])) >> FSHIFT; +} + +/* + * Attributes associated with virtual memory. + */ +vm_sysctl(name, namelen, oldp, oldlenp, newp, newlen, p) + int *name; + u_int namelen; + void *oldp; + size_t *oldlenp; + void *newp; + size_t newlen; + struct proc *p; +{ + struct vmtotal vmtotals; + + /* all sysctl names at this level are terminal */ + if (namelen != 1) + return (ENOTDIR); /* overloaded */ + + switch (name[0]) { + case VM_LOADAVG: + averunnable.fscale = FSCALE; + return (sysctl_rdstruct(oldp, oldlenp, newp, &averunnable, + sizeof(averunnable))); + case VM_METER: + vmtotal(&vmtotals); + return (sysctl_rdstruct(oldp, oldlenp, newp, &vmtotals, + sizeof(vmtotals))); + default: + return (EOPNOTSUPP); + } + /* NOTREACHED */ +} + +/* + * Calculate the current state of the system. + * Done on demand from getkerninfo(). + */ +void +vmtotal(totalp) + register struct vmtotal *totalp; +{ + register struct proc *p; + register vm_map_entry_t entry; + register vm_object_t object; + register vm_map_t map; + int paging; + + bzero(totalp, sizeof *totalp); + /* + * Mark all objects as inactive. + */ + simple_lock(&vm_object_list_lock); + for (object = vm_object_list.tqh_first; + object != NULL; + object = object->object_list.tqe_next) + object->flags &= ~OBJ_ACTIVE; + simple_unlock(&vm_object_list_lock); + /* + * Calculate process statistics. + */ + for (p = allproc.lh_first; p != 0; p = p->p_list.le_next) { + if (p->p_flag & P_SYSTEM) + continue; + switch (p->p_stat) { + case 0: + continue; + + case SSLEEP: + case SSTOP: + if (p->p_flag & P_INMEM) { + if (p->p_priority <= PZERO) + totalp->t_dw++; + else if (p->p_slptime < maxslp) + totalp->t_sl++; + } else if (p->p_slptime < maxslp) + totalp->t_sw++; + if (p->p_slptime >= maxslp) + continue; + break; + + case SRUN: + case SIDL: + if (p->p_flag & P_INMEM) + totalp->t_rq++; + else + totalp->t_sw++; + if (p->p_stat == SIDL) + continue; + break; + } + /* + * Note active objects. + */ + paging = 0; + for (map = &p->p_vmspace->vm_map, entry = map->header.next; + entry != &map->header; entry = entry->next) { + if (entry->is_a_map || entry->is_sub_map || + entry->object.vm_object == NULL) + continue; + entry->object.vm_object->flags |= OBJ_ACTIVE; + paging |= entry->object.vm_object->paging_in_progress; + } + if (paging) + totalp->t_pw++; + } + /* + * Calculate object memory usage statistics. + */ + simple_lock(&vm_object_list_lock); + for (object = vm_object_list.tqh_first; + object != NULL; + object = object->object_list.tqe_next) { + totalp->t_vm += num_pages(object->size); + totalp->t_rm += object->resident_page_count; + if (object->flags & OBJ_ACTIVE) { + totalp->t_avm += num_pages(object->size); + totalp->t_arm += object->resident_page_count; + } + if (object->ref_count > 1) { + /* shared object */ + totalp->t_vmshr += num_pages(object->size); + totalp->t_rmshr += object->resident_page_count; + if (object->flags & OBJ_ACTIVE) { + totalp->t_avmshr += num_pages(object->size); + totalp->t_armshr += object->resident_page_count; + } + } + } + totalp->t_free = cnt.v_free_count; +} |