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/*	$NetBSD: uvm_meter.c,v 1.2 1998/02/06 22:32:06 thorpej Exp $	*/

/*
 * XXXCDC: "ROUGH DRAFT" QUALITY UVM PRE-RELEASE FILE!   
 *         >>>USE AT YOUR OWN RISK, WORK IS NOT FINISHED<<<
 */
/*
 * 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
 */

#include <sys/param.h>
#include <sys/proc.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <vm/vm.h>
#include <sys/sysctl.h>

/*
 * 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;

  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;
}

/*
 * 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)));

  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

  bzero(totalp, sizeof *totalp);

  /*
   * 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
     */
#if 0
    /*
     * XXXCDC: BOGUS!  you can't walk a map entry chain without
     * first locking the map.   rethink this.   in the mean time
     * just don't do it.
     */
    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 |= vm_object_paging(entry->object.vm_object);
    }
    if (paging)
      totalp->t_pw++;
#endif
  }
  /*
   * Calculate object memory usage statistics.
   */
#if 0 /* XXXCDC: rethink! rethink! */
  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;
#endif
}