/* $NetBSD: uvm_meter.c,v 1.11 2000/02/11 19:22:54 thorpej Exp $ */ /* * Copyright (c) 1997 Charles D. Cranor and Washington University. * 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 Charles D. Cranor, * Washington University, and 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 * from: Id: uvm_meter.c,v 1.1.2.1 1997/08/14 19:10:35 chuck Exp */ #include #include #include #include #include #include /* * maxslp: ???? XXXCDC */ int maxslp = MAXSLP; /* patchable ... */ struct loadavg averunnable; /* decl. */ /* * constants for averages over 1, 5, and 15 minutes when sampling at * 5 second intervals. */ static fixpt_t cexp[3] = { 0.9200444146293232 * FSCALE, /* exp(-1/12) */ 0.9834714538216174 * FSCALE, /* exp(-1/60) */ 0.9944598480048967 * FSCALE, /* exp(-1/180) */ }; /* * prototypes */ static void uvm_loadav __P((struct loadavg *)); static void uvm_total __P((struct vmtotal *)); /* * uvm_meter: calculate load average and wake up the swapper (if needed) */ void uvm_meter() { if ((time.tv_sec % 5) == 0) uvm_loadav(&averunnable); if (proc0.p_slptime > (maxslp / 2)) wakeup((caddr_t)&proc0); } /* * uvm_loadav: compute a tenex style load average of a quantity on * 1, 5, and 15 minute internvals. */ static void uvm_loadav(avg) struct loadavg *avg; { int i, nrun; struct proc *p; proclist_lock_read(); 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++; } } proclist_unlock_read(); for (i = 0; i < 3; i++) avg->ldavg[i] = (cexp[i] * avg->ldavg[i] + nrun * FSCALE * (FSCALE - cexp[i])) >> FSHIFT; } /* * uvm_sysctl: sysctl hook into UVM system. */ int uvm_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: return (sysctl_rdstruct(oldp, oldlenp, newp, &averunnable, sizeof(averunnable))); case VM_METER: uvm_total(&vmtotals); return (sysctl_rdstruct(oldp, oldlenp, newp, &vmtotals, sizeof(vmtotals))); case VM_UVMEXP: return (sysctl_rdstruct(oldp, oldlenp, newp, &uvmexp, sizeof(uvmexp))); case VM_NKMEMPAGES: return (sysctl_rdint(oldp, oldlenp, newp, nkmempages)); default: return (EOPNOTSUPP); } /* NOTREACHED */ } /* * uvm_total: calculate the current state of the system. */ static void uvm_total(totalp) struct vmtotal *totalp; { struct proc *p; #if 0 vm_map_entry_t entry; vm_map_t map; int paging; #endif memset(totalp, 0, sizeof *totalp); /* * calculate process statistics */ proclist_lock_read(); 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 */ #if 0 /* * XXXCDC: BOGUS! rethink this. in the mean time * don't do it. */ paging = 0; vm_map_lock(map); 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.uvm_obj == NULL) continue; /* XXX how to do this with uvm */ } vm_map_unlock(map); if (paging) totalp->t_pw++; #endif } proclist_unlock_read(); /* * Calculate object memory usage statistics. */ totalp->t_free = uvmexp.free; totalp->t_vm = uvmexp.npages - uvmexp.free + uvmexp.swpginuse; totalp->t_avm = uvmexp.active + uvmexp.swpginuse; /* XXX */ totalp->t_rm = uvmexp.npages - uvmexp.free; totalp->t_arm = uvmexp.active; totalp->t_vmshr = 0; /* XXX */ totalp->t_avmshr = 0; /* XXX */ totalp->t_rmshr = 0; /* XXX */ totalp->t_armshr = 0; /* XXX */ }