/* * 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 * $Id: vm_meter.c,v 1.7 1995/07/13 08:48:30 davidg Exp $ */ #include #include #include #include #include #include struct loadavg averunnable; /* load average, of runnable procs */ struct vmmeter cnt; int maxslp = MAXSLP; /* * 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. */ static void loadav(avg) register struct loadavg *avg; { register int i, nrun; register struct proc *p; for (nrun = 0, p = (struct proc *) allproc; p != NULL; p = p->p_next) { switch (p->p_stat) { case SSLEEP: if (p->p_priority > PZERO || p->p_slptime != 0) 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; } void vmmeter() { if (time.tv_sec % 5 == 0) loadav(&averunnable); if (proc0.p_slptime > maxslp / 2) wakeup(&proc0); } /* * Attributes associated with virtual memory. */ int 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))); case VM_V_FREE_MIN: return (sysctl_int(oldp, oldlenp, newp, newlen, &cnt.v_free_min)); case VM_V_FREE_TARGET: return (sysctl_int(oldp, oldlenp, newp, newlen, &cnt.v_free_target)); case VM_V_FREE_RESERVED: return (sysctl_int(oldp, oldlenp, newp, newlen, &cnt.v_free_reserved)); case VM_V_INACTIVE_TARGET: return (sysctl_int(oldp, oldlenp, newp, newlen, &cnt.v_inactive_target)); case VM_V_CACHE_MIN: return (sysctl_int(oldp, oldlenp, newp, newlen, &cnt.v_cache_min)); case VM_V_CACHE_MAX: return (sysctl_int(oldp, oldlenp, newp, newlen, &cnt.v_cache_max)); case VM_V_PAGEOUT_FREE_MIN: return (sysctl_int(oldp, oldlenp, newp, newlen, &cnt.v_pageout_free_min)); 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. */ for (object = vm_object_list.tqh_first; object != NULL; object = object->object_list.tqe_next) object->flags &= ~OBJ_ACTIVE; /* * Calculate process statistics. */ for (p = (struct proc *) allproc; p != NULL; p = p->p_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. */ 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 + cnt.v_cache_count; }