/* $OpenBSD: uvm_meter.c,v 1.37 2017/05/09 09:36:04 mpi Exp $ */ /* $NetBSD: uvm_meter.c,v 1.21 2001/07/14 06:36:03 matt 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. 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 #include #ifdef UVM_SWAP_ENCRYPT #include #include #endif /* * The time for a process to be blocked before being very swappable. * This is a number of seconds which the system takes as being a non-trivial * amount of real time. You probably shouldn't change this; * it is used in subtle ways (fractions and multiples of it are, that is, like * half of a ``long time'', almost a long time, etc.) * It is related to human patience and other factors which don't really * change over time. */ #define MAXSLP 20 int maxslp = MAXSLP; /* patchable ... */ struct loadavg averunnable; /* * 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) */ }; static void uvm_loadav(struct loadavg *); void uvm_total(struct vmtotal *); /* * uvm_meter: calculate load average and wake up the swapper (if needed) */ void uvm_meter(void) { if ((time_second % 5) == 0) uvm_loadav(&averunnable); if (proc0.p_slptime > (maxslp / 2)) wakeup(&proc0); } /* * uvm_loadav: compute a tenex style load average of a quantity on * 1, 5, and 15 minute intervals. */ static void uvm_loadav(struct loadavg *avg) { CPU_INFO_ITERATOR cii; struct cpu_info *ci; int i, nrun; struct proc *p; int nrun_cpu[MAXCPUS]; nrun = 0; memset(nrun_cpu, 0, sizeof(nrun_cpu)); LIST_FOREACH(p, &allproc, p_list) { switch (p->p_stat) { case SSTOP: case SSLEEP: break; case SRUN: case SONPROC: if (p == p->p_cpu->ci_schedstate.spc_idleproc) continue; /* FALLTHROUGH */ case SIDL: nrun++; if (p->p_cpu) nrun_cpu[CPU_INFO_UNIT(p->p_cpu)]++; } } for (i = 0; i < 3; i++) { avg->ldavg[i] = (cexp[i] * avg->ldavg[i] + nrun * FSCALE * (FSCALE - cexp[i])) >> FSHIFT; } CPU_INFO_FOREACH(cii, ci) { struct schedstate_percpu *spc = &ci->ci_schedstate; if (nrun_cpu[CPU_INFO_UNIT(ci)] == 0) continue; spc->spc_ldavg = (cexp[0] * spc->spc_ldavg + nrun_cpu[CPU_INFO_UNIT(ci)] * FSCALE * (FSCALE - cexp[0])) >> FSHIFT; } } /* * uvm_sysctl: sysctl hook into UVM system. */ int uvm_sysctl(int *name, u_int namelen, void *oldp, size_t *oldlenp, void *newp, size_t newlen, struct proc *p) { struct process *pr = p->p_p; struct vmtotal vmtotals; int rv, t; switch (name[0]) { case VM_SWAPENCRYPT: #ifdef UVM_SWAP_ENCRYPT return (swap_encrypt_ctl(name + 1, namelen - 1, oldp, oldlenp, newp, newlen, p)); #else return (EOPNOTSUPP); #endif default: /* all sysctl names at this level are terminal */ if (namelen != 1) return (ENOTDIR); /* overloaded */ break; } 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)); case VM_PSSTRINGS: return (sysctl_rdstruct(oldp, oldlenp, newp, &pr->ps_strings, sizeof(pr->ps_strings))); case VM_ANONMIN: t = uvmexp.anonminpct; rv = sysctl_int(oldp, oldlenp, newp, newlen, &t); if (rv) { return rv; } if (t + uvmexp.vtextminpct + uvmexp.vnodeminpct > 95 || t < 0) { return EINVAL; } uvmexp.anonminpct = t; uvmexp.anonmin = t * 256 / 100; return rv; case VM_VTEXTMIN: t = uvmexp.vtextminpct; rv = sysctl_int(oldp, oldlenp, newp, newlen, &t); if (rv) { return rv; } if (uvmexp.anonminpct + t + uvmexp.vnodeminpct > 95 || t < 0) { return EINVAL; } uvmexp.vtextminpct = t; uvmexp.vtextmin = t * 256 / 100; return rv; case VM_VNODEMIN: t = uvmexp.vnodeminpct; rv = sysctl_int(oldp, oldlenp, newp, newlen, &t); if (rv) { return rv; } if (uvmexp.anonminpct + uvmexp.vtextminpct + t > 95 || t < 0) { return EINVAL; } uvmexp.vnodeminpct = t; uvmexp.vnodemin = t * 256 / 100; return rv; case VM_MAXSLP: return (sysctl_rdint(oldp, oldlenp, newp, maxslp)); case VM_USPACE: return (sysctl_rdint(oldp, oldlenp, newp, USPACE)); default: return (EOPNOTSUPP); } /* NOTREACHED */ } /* * uvm_total: calculate the current state of the system. */ void uvm_total(struct vmtotal *totalp) { struct proc *p; #if 0 struct vm_map_entry * entry; struct vm_map *map; int paging; #endif memset(totalp, 0, sizeof *totalp); /* calculate process statistics */ LIST_FOREACH(p, &allproc, p_list) { switch (p->p_stat) { case 0: continue; case SSLEEP: case SSTOP: totalp->t_sl++; break; case SRUN: case SONPROC: if (p == p->p_cpu->ci_schedstate.spc_idleproc) continue; case SIDL: totalp->t_rq++; 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 } /* * 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 */ }