/*      $NetBSD: uvm_meter.c,v 1.80 2020/06/14 21:41:42 ad 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 <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: uvm_meter.c,v 1.80 2020/06/14 21:41:42 ad Exp $");

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

#include <uvm/uvm.h>
#include <uvm/uvm_pdpolicy.h>

/*
* maxslp: ???? XXXCDC
*/

int maxslp = MAXSLP;    /* patchable ... */
struct loadavg averunnable;

static void uvm_total(struct vmtotal *);

/*
* sysctl helper routine for the vm.vmmeter node.
*/
static int
sysctl_vm_meter(SYSCTLFN_ARGS)
{
       struct sysctlnode node;
       struct vmtotal vmtotals;

       node = *rnode;
       node.sysctl_data = &vmtotals;
       uvm_total(&vmtotals);

       return (sysctl_lookup(SYSCTLFN_CALL(&node)));
}

/*
* sysctl helper routine for the vm.uvmexp node.
*/
static int
sysctl_vm_uvmexp(SYSCTLFN_ARGS)
{
       struct sysctlnode node;

       uvm_update_uvmexp();

       node = *rnode;
       if (oldlenp)
               node.sysctl_size = uimin(*oldlenp, node.sysctl_size);

       return (sysctl_lookup(SYSCTLFN_CALL(&node)));
}

static int
sysctl_vm_uvmexp2(SYSCTLFN_ARGS)
{
       struct sysctlnode node;
       struct uvmexp_sysctl u;
       int active, inactive;

       uvm_estimatepageable(&active, &inactive);

       memset(&u, 0, sizeof(u));

       /* uvm_availmem() will sync the counters if old. */
       u.free = uvm_availmem(true);
       u.pagesize = uvmexp.pagesize;
       u.pagemask = uvmexp.pagemask;
       u.pageshift = uvmexp.pageshift;
       u.npages = uvmexp.npages;
       u.active = active;
       u.inactive = inactive;
       u.paging = uvmexp.paging;
       u.wired = uvmexp.wired;
       u.reserve_pagedaemon = uvmexp.reserve_pagedaemon;
       u.reserve_kernel = uvmexp.reserve_kernel;
       u.freemin = uvmexp.freemin;
       u.freetarg = uvmexp.freetarg;
       u.inactarg = 0; /* unused */
       u.wiredmax = uvmexp.wiredmax;
       u.nswapdev = uvmexp.nswapdev;
       u.swpages = uvmexp.swpages;
       u.swpginuse = uvmexp.swpginuse;
       u.swpgonly = uvmexp.swpgonly;
       u.nswget = uvmexp.nswget;
       u.cpuhit = cpu_count_get(CPU_COUNT_CPUHIT);
       u.cpumiss = cpu_count_get(CPU_COUNT_CPUMISS);
       u.faults = cpu_count_get(CPU_COUNT_NFAULT);
       u.traps = cpu_count_get(CPU_COUNT_NTRAP);
       u.intrs = cpu_count_get(CPU_COUNT_NINTR);
       u.swtch = cpu_count_get(CPU_COUNT_NSWTCH);
       u.softs = cpu_count_get(CPU_COUNT_NSOFT);
       u.syscalls = cpu_count_get(CPU_COUNT_NSYSCALL);
       u.pageins = cpu_count_get(CPU_COUNT_PAGEINS);
       u.pgswapin = 0; /* unused */
       u.pgswapout = uvmexp.pgswapout;
       u.forks = cpu_count_get(CPU_COUNT_FORKS);
       u.forks_ppwait = cpu_count_get(CPU_COUNT_FORKS_PPWAIT);
       u.forks_sharevm = cpu_count_get(CPU_COUNT_FORKS_SHAREVM);
       u.zeroaborts = uvmexp.zeroaborts;
       u.fltnoram = cpu_count_get(CPU_COUNT_FLTNORAM);
       u.fltnoanon = cpu_count_get(CPU_COUNT_FLTNOANON);
       u.fltpgwait = cpu_count_get(CPU_COUNT_FLTPGWAIT);
       u.fltpgrele = cpu_count_get(CPU_COUNT_FLTPGRELE);
       u.fltrelck = cpu_count_get(CPU_COUNT_FLTRELCK);
       u.fltrelckok = cpu_count_get(CPU_COUNT_FLTRELCKOK);
       u.fltanget = cpu_count_get(CPU_COUNT_FLTANGET);
       u.fltanretry = cpu_count_get(CPU_COUNT_FLTANRETRY);
       u.fltamcopy = cpu_count_get(CPU_COUNT_FLTAMCOPY);
       u.fltnamap = cpu_count_get(CPU_COUNT_FLTNAMAP);
       u.fltnomap = cpu_count_get(CPU_COUNT_FLTNOMAP);
       u.fltlget = cpu_count_get(CPU_COUNT_FLTLGET);
       u.fltget = cpu_count_get(CPU_COUNT_FLTGET);
       u.flt_anon = cpu_count_get(CPU_COUNT_FLT_ANON);
       u.flt_acow = cpu_count_get(CPU_COUNT_FLT_ACOW);
       u.flt_obj = cpu_count_get(CPU_COUNT_FLT_OBJ);
       u.flt_prcopy = cpu_count_get(CPU_COUNT_FLT_PRCOPY);
       u.flt_przero = cpu_count_get(CPU_COUNT_FLT_PRZERO);
       u.pdwoke = uvmexp.pdwoke;
       u.pdrevs = uvmexp.pdrevs;
       u.pdfreed = uvmexp.pdfreed;
       u.pdscans = uvmexp.pdscans;
       u.pdanscan = uvmexp.pdanscan;
       u.pdobscan = uvmexp.pdobscan;
       u.pdreact = uvmexp.pdreact;
       u.pdbusy = uvmexp.pdbusy;
       u.pdpageouts = uvmexp.pdpageouts;
       u.pdpending = uvmexp.pdpending;
       u.pddeact = uvmexp.pddeact;
       u.execpages = cpu_count_get(CPU_COUNT_EXECPAGES);
       u.colorhit = cpu_count_get(CPU_COUNT_COLORHIT);
       u.colormiss = cpu_count_get(CPU_COUNT_COLORMISS);
       u.ncolors = uvmexp.ncolors;
       u.bootpages = uvmexp.bootpages;
       u.poolpages = pool_totalpages();
       u.countsyncall = cpu_count_get(CPU_COUNT_SYNC);
       u.anonunknown = cpu_count_get(CPU_COUNT_ANONUNKNOWN);
       u.anonclean = cpu_count_get(CPU_COUNT_ANONCLEAN);
       u.anondirty = cpu_count_get(CPU_COUNT_ANONDIRTY);
       u.fileunknown = cpu_count_get(CPU_COUNT_FILEUNKNOWN);
       u.fileclean = cpu_count_get(CPU_COUNT_FILECLEAN);
       u.filedirty = cpu_count_get(CPU_COUNT_FILEDIRTY);
       u.fltup = cpu_count_get(CPU_COUNT_FLTUP);
       u.fltnoup = cpu_count_get(CPU_COUNT_FLTNOUP);
       u.anonpages = u.anonclean + u.anondirty + u.anonunknown;
       u.filepages = u.fileclean + u.filedirty + u.fileunknown - u.execpages;

       node = *rnode;
       node.sysctl_data = &u;
       node.sysctl_size = sizeof(u);
       if (oldlenp)
               node.sysctl_size = uimin(*oldlenp, node.sysctl_size);
       return (sysctl_lookup(SYSCTLFN_CALL(&node)));
}

/*
* sysctl helper routine for uvm_pctparam.
*/
static int
uvm_sysctlpctparam(SYSCTLFN_ARGS)
{
       int t, error;
       struct sysctlnode node;
       struct uvm_pctparam *pct;

       pct = rnode->sysctl_data;
       t = pct->pct_pct;

       node = *rnode;
       node.sysctl_data = &t;
       error = sysctl_lookup(SYSCTLFN_CALL(&node));
       if (error || newp == NULL)
               return error;

       if (t < 0 || t > 100)
               return EINVAL;

       error = uvm_pctparam_check(pct, t);
       if (error) {
               return error;
       }
       uvm_pctparam_set(pct, t);

       return (0);
}

/*
* uvm_sysctl: sysctl hook into UVM system.
*/
SYSCTL_SETUP(sysctl_vm_setup, "sysctl vm subtree setup")
{

       sysctl_createv(clog, 0, NULL, NULL,
                      CTLFLAG_PERMANENT,
                      CTLTYPE_STRUCT, "vmmeter",
                      SYSCTL_DESCR("Simple system-wide virtual memory "
                                   "statistics"),
                      sysctl_vm_meter, 0, NULL, sizeof(struct vmtotal),
                      CTL_VM, VM_METER, CTL_EOL);
       sysctl_createv(clog, 0, NULL, NULL,
                      CTLFLAG_PERMANENT,
                      CTLTYPE_STRUCT, "loadavg",
                      SYSCTL_DESCR("System load average history"),
                      NULL, 0, &averunnable, sizeof(averunnable),
                      CTL_VM, VM_LOADAVG, CTL_EOL);
       sysctl_createv(clog, 0, NULL, NULL,
                      CTLFLAG_PERMANENT,
                      CTLTYPE_STRUCT, "uvmexp",
                      SYSCTL_DESCR("Detailed system-wide virtual memory "
                                   "statistics"),
                      sysctl_vm_uvmexp, 0, &uvmexp, sizeof(uvmexp),
                      CTL_VM, VM_UVMEXP, CTL_EOL);
       sysctl_createv(clog, 0, NULL, NULL,
                      CTLFLAG_PERMANENT,
                      CTLTYPE_STRUCT, "uvmexp2",
                      SYSCTL_DESCR("Detailed system-wide virtual memory "
                                   "statistics (MI)"),
                      sysctl_vm_uvmexp2, 0, NULL, 0,
                      CTL_VM, VM_UVMEXP2, CTL_EOL);
       sysctl_createv(clog, 0, NULL, NULL,
                      CTLFLAG_PERMANENT, CTLTYPE_INT, "maxslp",
                      SYSCTL_DESCR("Maximum process sleep time before being "
                                   "swapped"),
                      NULL, 0, &maxslp, 0,
                      CTL_VM, VM_MAXSLP, CTL_EOL);
       sysctl_createv(clog, 0, NULL, NULL,
                      CTLFLAG_PERMANENT|CTLFLAG_IMMEDIATE,
                      CTLTYPE_INT, "uspace",
                      SYSCTL_DESCR("Number of bytes allocated for a kernel "
                                   "stack"),
                      NULL, USPACE, NULL, 0,
                      CTL_VM, VM_USPACE, CTL_EOL);
       sysctl_createv(clog, 0, NULL, NULL,
                      CTLFLAG_PERMANENT|CTLFLAG_IMMEDIATE,
                      CTLTYPE_LONG, "minaddress",
                      SYSCTL_DESCR("Minimum user address"),
                      NULL, VM_MIN_ADDRESS, NULL, 0,
                      CTL_VM, VM_MINADDRESS, CTL_EOL);
       sysctl_createv(clog, 0, NULL, NULL,
                      CTLFLAG_PERMANENT|CTLFLAG_IMMEDIATE,
                      CTLTYPE_LONG, "maxaddress",
                      SYSCTL_DESCR("Maximum user address"),
                      NULL, VM_MAX_ADDRESS, NULL, 0,
                      CTL_VM, VM_MAXADDRESS, CTL_EOL);
       sysctl_createv(clog, 0, NULL, NULL,
                      CTLFLAG_PERMANENT|CTLFLAG_UNSIGNED,
                      CTLTYPE_INT, "guard_size",
                      SYSCTL_DESCR("Guard size of main thread"),
                      NULL, 0, &user_stack_guard_size, 0,
                      CTL_VM, VM_GUARD_SIZE, CTL_EOL);
       sysctl_createv(clog, 0, NULL, NULL,
                      CTLFLAG_PERMANENT|CTLFLAG_UNSIGNED|CTLFLAG_READWRITE,
                      CTLTYPE_INT, "thread_guard_size",
                      SYSCTL_DESCR("Guard size of other threads"),
                      NULL, 0, &user_thread_stack_guard_size, 0,
                      CTL_VM, VM_THREAD_GUARD_SIZE, CTL_EOL);
#ifdef PMAP_DIRECT
       sysctl_createv(clog, 0, NULL, NULL,
                      CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
                      CTLTYPE_BOOL, "ubc_direct",
                      SYSCTL_DESCR("Use direct map for UBC I/O"),
                      NULL, 0, &ubc_direct, 0,
                      CTL_VM, CTL_CREATE, CTL_EOL);
#endif

       uvmpdpol_sysctlsetup();
}

/*
* uvm_total: calculate the current state of the system.
*/
static void
uvm_total(struct vmtotal *totalp)
{
       struct lwp *l;
#if 0
       struct vm_map_entry *   entry;
       struct vm_map *map;
       int paging;
#endif
       int freepg;
       int active;

       memset(totalp, 0, sizeof *totalp);

       /*
        * calculate process statistics
        */
       mutex_enter(&proc_lock);
       LIST_FOREACH(l, &alllwp, l_list) {
               if (l->l_proc->p_flag & PK_SYSTEM)
                       continue;
               switch (l->l_stat) {
               case 0:
                       continue;

               case LSSLEEP:
               case LSSTOP:
                       if ((l->l_flag & LW_SINTR) == 0) {
                               totalp->t_dw++;
                       } else if (l->l_slptime < maxslp) {
                               totalp->t_sl++;
                       }
                       if (l->l_slptime >= maxslp)
                               continue;
                       break;

               case LSRUN:
               case LSONPROC:
               case LSIDL:
                       totalp->t_rq++;
                       if (l->l_stat == LSIDL)
                               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
       }
       mutex_exit(&proc_lock);

       /*
        * Calculate object memory usage statistics.
        */
       freepg = uvm_availmem(true);
       uvm_estimatepageable(&active, NULL);
       totalp->t_free = freepg;
       totalp->t_vm = uvmexp.npages - freepg + uvmexp.swpginuse;
       totalp->t_avm = active + uvmexp.swpginuse;      /* XXX */
       totalp->t_rm = uvmexp.npages - freepg;
       totalp->t_arm = active;
       totalp->t_vmshr = 0;            /* XXX */
       totalp->t_avmshr = 0;           /* XXX */
       totalp->t_rmshr = 0;            /* XXX */
       totalp->t_armshr = 0;           /* XXX */
}

void
uvm_pctparam_set(struct uvm_pctparam *pct, int val)
{

       pct->pct_pct = val;
       pct->pct_scaled = val * UVM_PCTPARAM_SCALE / 100;
}

int
uvm_pctparam_get(struct uvm_pctparam *pct)
{

       return pct->pct_pct;
}

int
uvm_pctparam_check(struct uvm_pctparam *pct, int val)
{

       if (pct->pct_check == NULL) {
               return 0;
       }
       return (*pct->pct_check)(pct, val);
}

void
uvm_pctparam_init(struct uvm_pctparam *pct, int val,
   int (*fn)(struct uvm_pctparam *, int))
{

       pct->pct_check = fn;
       uvm_pctparam_set(pct, val);
}

int
uvm_pctparam_createsysctlnode(struct uvm_pctparam *pct, const char *name,
   const char *desc)
{

       return sysctl_createv(NULL, 0, NULL, NULL,
           CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
           CTLTYPE_INT, name, SYSCTL_DESCR(desc),
           uvm_sysctlpctparam, 0, (void *)pct, 0, CTL_VM, CTL_CREATE, CTL_EOL);
}

/*
* Update uvmexp with aggregate values from the per-CPU counters.
*/
void
uvm_update_uvmexp(void)
{

       /* uvm_availmem() will sync the counters if old. */
       uvmexp.free = (int)uvm_availmem(true);
       uvmexp.cpuhit = (int)cpu_count_get(CPU_COUNT_CPUHIT);
       uvmexp.cpumiss = (int)cpu_count_get(CPU_COUNT_CPUMISS);
       uvmexp.faults = (int)cpu_count_get(CPU_COUNT_NFAULT);
       uvmexp.traps = (int)cpu_count_get(CPU_COUNT_NTRAP);
       uvmexp.intrs = (int)cpu_count_get(CPU_COUNT_NINTR);
       uvmexp.swtch = (int)cpu_count_get(CPU_COUNT_NSWTCH);
       uvmexp.softs = (int)cpu_count_get(CPU_COUNT_NSOFT);
       uvmexp.syscalls = (int)cpu_count_get(CPU_COUNT_NSYSCALL);
       uvmexp.pageins = (int)cpu_count_get(CPU_COUNT_PAGEINS);
       uvmexp.forks = (int)cpu_count_get(CPU_COUNT_FORKS);
       uvmexp.forks_ppwait = (int)cpu_count_get(CPU_COUNT_FORKS_PPWAIT);
       uvmexp.forks_sharevm = (int)cpu_count_get(CPU_COUNT_FORKS_SHAREVM);
       uvmexp.fltnoram = (int)cpu_count_get(CPU_COUNT_FLTNORAM);
       uvmexp.fltnoanon = (int)cpu_count_get(CPU_COUNT_FLTNOANON);
       uvmexp.fltpgwait = (int)cpu_count_get(CPU_COUNT_FLTPGWAIT);
       uvmexp.fltpgrele = (int)cpu_count_get(CPU_COUNT_FLTPGRELE);
       uvmexp.fltrelck = (int)cpu_count_get(CPU_COUNT_FLTRELCK);
       uvmexp.fltrelckok = (int)cpu_count_get(CPU_COUNT_FLTRELCKOK);
       uvmexp.fltanget = (int)cpu_count_get(CPU_COUNT_FLTANGET);
       uvmexp.fltanretry = (int)cpu_count_get(CPU_COUNT_FLTANRETRY);
       uvmexp.fltamcopy = (int)cpu_count_get(CPU_COUNT_FLTAMCOPY);
       uvmexp.fltnamap = (int)cpu_count_get(CPU_COUNT_FLTNAMAP);
       uvmexp.fltnomap = (int)cpu_count_get(CPU_COUNT_FLTNOMAP);
       uvmexp.fltlget = (int)cpu_count_get(CPU_COUNT_FLTLGET);
       uvmexp.fltget = (int)cpu_count_get(CPU_COUNT_FLTGET);
       uvmexp.flt_anon = (int)cpu_count_get(CPU_COUNT_FLT_ANON);
       uvmexp.flt_acow = (int)cpu_count_get(CPU_COUNT_FLT_ACOW);
       uvmexp.flt_obj = (int)cpu_count_get(CPU_COUNT_FLT_OBJ);
       uvmexp.flt_prcopy = (int)cpu_count_get(CPU_COUNT_FLT_PRCOPY);
       uvmexp.flt_przero = (int)cpu_count_get(CPU_COUNT_FLT_PRZERO);
       uvmexp.anonpages = (int)(cpu_count_get(CPU_COUNT_ANONCLEAN) +
           cpu_count_get(CPU_COUNT_ANONDIRTY) +
           cpu_count_get(CPU_COUNT_ANONUNKNOWN));
       uvmexp.filepages = (int)(cpu_count_get(CPU_COUNT_FILECLEAN) +
           cpu_count_get(CPU_COUNT_FILEDIRTY) +
           cpu_count_get(CPU_COUNT_FILEUNKNOWN) -
           cpu_count_get(CPU_COUNT_EXECPAGES));
       uvmexp.execpages = (int)cpu_count_get(CPU_COUNT_EXECPAGES);
       uvmexp.colorhit = (int)cpu_count_get(CPU_COUNT_COLORHIT);
       uvmexp.colormiss = (int)cpu_count_get(CPU_COUNT_COLORMISS);
}

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