FreeBSD/Linux Kernel Cross Reference
sys/kern/kern_racct.c

     /*-
      * Copyright (c) 2010 The FreeBSD Foundation
      * All rights reserved.
      *
      * This software was developed by Edward Tomasz Napierala under sponsorship
      * from the FreeBSD Foundation.
      *
      * 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.
     *
     * THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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.
     *
     * $FreeBSD: releng/9.1/sys/kern/kern_racct.c 236253 2012-05-29 19:47:06Z trasz $
     */
    
    #include <sys/cdefs.h>
    __FBSDID("$FreeBSD: releng/9.1/sys/kern/kern_racct.c 236253 2012-05-29 19:47:06Z trasz $");
    
    #include "opt_kdtrace.h"
    
    #include <sys/param.h>
    #include <sys/systm.h>
    #include <sys/eventhandler.h>
    #include <sys/jail.h>
    #include <sys/kernel.h>
    #include <sys/kthread.h>
    #include <sys/lock.h>
    #include <sys/loginclass.h>
    #include <sys/malloc.h>
    #include <sys/mutex.h>
    #include <sys/proc.h>
    #include <sys/racct.h>
    #include <sys/resourcevar.h>
    #include <sys/sbuf.h>
    #include <sys/sched.h>
    #include <sys/sdt.h>
    #include <sys/sx.h>
    #include <sys/sysent.h>
    #include <sys/sysproto.h>
    #include <sys/umtx.h>
    
    #ifdef RCTL
    #include <sys/rctl.h>
    #endif
    
    #ifdef RACCT
    
    FEATURE(racct, "Resource Accounting");
    
    static struct mtx racct_lock;
    MTX_SYSINIT(racct_lock, &racct_lock, "racct lock", MTX_DEF);
    
    static uma_zone_t racct_zone;
    
    static void racct_sub_racct(struct racct *dest, const struct racct *src);
    static void racct_sub_cred_locked(struct ucred *cred, int resource,
                    uint64_t amount);
    static void racct_add_cred_locked(struct ucred *cred, int resource,
                    uint64_t amount);
    
    SDT_PROVIDER_DEFINE(racct);
    SDT_PROBE_DEFINE3(racct, kernel, rusage, add, add, "struct proc *", "int",
        "uint64_t");
    SDT_PROBE_DEFINE3(racct, kernel, rusage, add_failure, add-failure,
        "struct proc *", "int", "uint64_t");
    SDT_PROBE_DEFINE3(racct, kernel, rusage, add_cred, add-cred, "struct ucred *",
        "int", "uint64_t");
    SDT_PROBE_DEFINE3(racct, kernel, rusage, add_force, add-force, "struct proc *",
        "int", "uint64_t");
    SDT_PROBE_DEFINE3(racct, kernel, rusage, set, set, "struct proc *", "int",
        "uint64_t");
    SDT_PROBE_DEFINE3(racct, kernel, rusage, set_failure, set-failure,
        "struct proc *", "int", "uint64_t");
    SDT_PROBE_DEFINE3(racct, kernel, rusage, sub, sub, "struct proc *", "int",
        "uint64_t");
    SDT_PROBE_DEFINE3(racct, kernel, rusage, sub_cred, sub-cred, "struct ucred *",
        "int", "uint64_t");
    SDT_PROBE_DEFINE1(racct, kernel, racct, create, create, "struct racct *");
    SDT_PROBE_DEFINE1(racct, kernel, racct, destroy, destroy, "struct racct *");
    SDT_PROBE_DEFINE2(racct, kernel, racct, join, join, "struct racct *",
        "struct racct *");
    SDT_PROBE_DEFINE2(racct, kernel, racct, join_failure, join-failure,
        "struct racct *", "struct racct *");
   SDT_PROBE_DEFINE2(racct, kernel, racct, leave, leave, "struct racct *",
       "struct racct *");
   
   int racct_types[] = {
           [RACCT_CPU] =
                   RACCT_IN_MILLIONS,
           [RACCT_DATA] =
                   RACCT_RECLAIMABLE | RACCT_INHERITABLE | RACCT_DENIABLE,
           [RACCT_STACK] =
                   RACCT_RECLAIMABLE | RACCT_INHERITABLE | RACCT_DENIABLE,
           [RACCT_CORE] =
                   RACCT_DENIABLE,
           [RACCT_RSS] =
                   RACCT_RECLAIMABLE,
           [RACCT_MEMLOCK] =
                   RACCT_RECLAIMABLE | RACCT_DENIABLE,
           [RACCT_NPROC] =
                   RACCT_RECLAIMABLE | RACCT_DENIABLE,
           [RACCT_NOFILE] =
                   RACCT_RECLAIMABLE | RACCT_INHERITABLE | RACCT_DENIABLE,
           [RACCT_VMEM] =
                   RACCT_RECLAIMABLE | RACCT_INHERITABLE | RACCT_DENIABLE,
           [RACCT_NPTS] =
                   RACCT_RECLAIMABLE | RACCT_DENIABLE | RACCT_SLOPPY,
           [RACCT_SWAP] =
                   RACCT_RECLAIMABLE | RACCT_DENIABLE | RACCT_SLOPPY,
           [RACCT_NTHR] =
                   RACCT_RECLAIMABLE | RACCT_DENIABLE,
           [RACCT_MSGQQUEUED] =
                   RACCT_RECLAIMABLE | RACCT_DENIABLE | RACCT_SLOPPY,
           [RACCT_MSGQSIZE] =
                   RACCT_RECLAIMABLE | RACCT_DENIABLE | RACCT_SLOPPY,
           [RACCT_NMSGQ] =
                   RACCT_RECLAIMABLE | RACCT_DENIABLE | RACCT_SLOPPY,
           [RACCT_NSEM] =
                   RACCT_RECLAIMABLE | RACCT_DENIABLE | RACCT_SLOPPY,
           [RACCT_NSEMOP] =
                   RACCT_RECLAIMABLE | RACCT_INHERITABLE | RACCT_DENIABLE,
           [RACCT_NSHM] =
                   RACCT_RECLAIMABLE | RACCT_DENIABLE | RACCT_SLOPPY,
           [RACCT_SHMSIZE] =
                   RACCT_RECLAIMABLE | RACCT_DENIABLE | RACCT_SLOPPY,
           [RACCT_WALLCLOCK] =
                   RACCT_IN_MILLIONS };
   
   static void
   racct_add_racct(struct racct *dest, const struct racct *src)
   {
           int i;
   
           mtx_assert(&racct_lock, MA_OWNED);
   
           /*
            * Update resource usage in dest.
            */
           for (i = 0; i <= RACCT_MAX; i++) {
                   KASSERT(dest->r_resources[i] >= 0,
                       ("racct propagation meltdown: dest < 0"));
                   KASSERT(src->r_resources[i] >= 0,
                       ("racct propagation meltdown: src < 0"));
                   dest->r_resources[i] += src->r_resources[i];
           }
   }
   
   static void
   racct_sub_racct(struct racct *dest, const struct racct *src)
   {
           int i;
   
           mtx_assert(&racct_lock, MA_OWNED);
   
           /*
            * Update resource usage in dest.
            */
           for (i = 0; i <= RACCT_MAX; i++) {
                   if (!RACCT_IS_SLOPPY(i)) {
                           KASSERT(dest->r_resources[i] >= 0,
                               ("racct propagation meltdown: dest < 0"));
                           KASSERT(src->r_resources[i] >= 0,
                               ("racct propagation meltdown: src < 0"));
                           KASSERT(src->r_resources[i] <= dest->r_resources[i],
                               ("racct propagation meltdown: src > dest"));
                   }
                   if (RACCT_IS_RECLAIMABLE(i)) {
                           dest->r_resources[i] -= src->r_resources[i];
                           if (dest->r_resources[i] < 0) {
                                   KASSERT(RACCT_IS_SLOPPY(i),
                                       ("racct_sub_racct: usage < 0"));
                                   dest->r_resources[i] = 0;
                           }
                   }
           }
   }
   
   void
   racct_create(struct racct **racctp)
   {
   
           SDT_PROBE(racct, kernel, racct, create, racctp, 0, 0, 0, 0);
   
           KASSERT(*racctp == NULL, ("racct already allocated"));
   
           *racctp = uma_zalloc(racct_zone, M_WAITOK | M_ZERO);
   }
   
   static void
   racct_destroy_locked(struct racct **racctp)
   {
           int i;
           struct racct *racct;
   
           SDT_PROBE(racct, kernel, racct, destroy, racctp, 0, 0, 0, 0);
   
           mtx_assert(&racct_lock, MA_OWNED);
           KASSERT(racctp != NULL, ("NULL racctp"));
           KASSERT(*racctp != NULL, ("NULL racct"));
   
           racct = *racctp;
   
           for (i = 0; i <= RACCT_MAX; i++) {
                   if (RACCT_IS_SLOPPY(i))
                           continue;
                   if (!RACCT_IS_RECLAIMABLE(i))
                           continue;
                   KASSERT(racct->r_resources[i] == 0,
                       ("destroying non-empty racct: "
                       "%ju allocated for resource %d\n",
                       racct->r_resources[i], i));
           }
           uma_zfree(racct_zone, racct);
           *racctp = NULL;
   }
   
   void
   racct_destroy(struct racct **racct)
   {
   
           mtx_lock(&racct_lock);
           racct_destroy_locked(racct);
           mtx_unlock(&racct_lock);
   }
   
   /*
    * Increase consumption of 'resource' by 'amount' for 'racct'
    * and all its parents.  Differently from other cases, 'amount' here
    * may be less than zero.
    */
   static void
   racct_alloc_resource(struct racct *racct, int resource,
       uint64_t amount)
   {
   
           mtx_assert(&racct_lock, MA_OWNED);
           KASSERT(racct != NULL, ("NULL racct"));
   
           racct->r_resources[resource] += amount;
           if (racct->r_resources[resource] < 0) {
                   KASSERT(RACCT_IS_SLOPPY(resource),
                       ("racct_alloc_resource: usage < 0"));
                   racct->r_resources[resource] = 0;
           }
   }
   
   static int
   racct_add_locked(struct proc *p, int resource, uint64_t amount)
   {
   #ifdef RCTL
           int error;
   #endif
   
           SDT_PROBE(racct, kernel, rusage, add, p, resource, amount, 0, 0);
   
           /*
            * We need proc lock to dereference p->p_ucred.
            */
           PROC_LOCK_ASSERT(p, MA_OWNED);
   
   #ifdef RCTL
           error = rctl_enforce(p, resource, amount);
           if (error && RACCT_IS_DENIABLE(resource)) {
                   SDT_PROBE(racct, kernel, rusage, add_failure, p, resource,
                       amount, 0, 0);
                   return (error);
           }
   #endif
           racct_alloc_resource(p->p_racct, resource, amount);
           racct_add_cred_locked(p->p_ucred, resource, amount);
   
           return (0);
   }
   
   /*
    * Increase allocation of 'resource' by 'amount' for process 'p'.
    * Return 0 if it's below limits, or errno, if it's not.
    */
   int
   racct_add(struct proc *p, int resource, uint64_t amount)
   {
           int error;
   
           mtx_lock(&racct_lock);
           error = racct_add_locked(p, resource, amount);
           mtx_unlock(&racct_lock);
           return (error);
   }
   
   static void
   racct_add_cred_locked(struct ucred *cred, int resource, uint64_t amount)
   {
           struct prison *pr;
   
           SDT_PROBE(racct, kernel, rusage, add_cred, cred, resource, amount,
               0, 0);
   
           racct_alloc_resource(cred->cr_ruidinfo->ui_racct, resource, amount);
           for (pr = cred->cr_prison; pr != NULL; pr = pr->pr_parent)
                   racct_alloc_resource(pr->pr_prison_racct->prr_racct, resource,
                       amount);
           racct_alloc_resource(cred->cr_loginclass->lc_racct, resource, amount);
   }
   
   /*
    * Increase allocation of 'resource' by 'amount' for credential 'cred'.
    * Doesn't check for limits and never fails.
    *
    * XXX: Shouldn't this ever return an error?
    */
   void
   racct_add_cred(struct ucred *cred, int resource, uint64_t amount)
   {
   
           mtx_lock(&racct_lock);
           racct_add_cred_locked(cred, resource, amount);
           mtx_unlock(&racct_lock);
   }
   
   /*
    * Increase allocation of 'resource' by 'amount' for process 'p'.
    * Doesn't check for limits and never fails.
    */
   void
   racct_add_force(struct proc *p, int resource, uint64_t amount)
   {
   
           SDT_PROBE(racct, kernel, rusage, add_force, p, resource, amount, 0, 0);
   
           /*
            * We need proc lock to dereference p->p_ucred.
            */
           PROC_LOCK_ASSERT(p, MA_OWNED);
   
           mtx_lock(&racct_lock);
           racct_alloc_resource(p->p_racct, resource, amount);
           mtx_unlock(&racct_lock);
           racct_add_cred(p->p_ucred, resource, amount);
   }
   
   static int
   racct_set_locked(struct proc *p, int resource, uint64_t amount)
   {
           int64_t diff;
   #ifdef RCTL
           int error;
   #endif
   
           SDT_PROBE(racct, kernel, rusage, set, p, resource, amount, 0, 0);
   
           /*
            * We need proc lock to dereference p->p_ucred.
            */
           PROC_LOCK_ASSERT(p, MA_OWNED);
   
           diff = amount - p->p_racct->r_resources[resource];
   #ifdef notyet
           KASSERT(diff >= 0 || RACCT_IS_RECLAIMABLE(resource),
               ("racct_set: usage of non-reclaimable resource %d dropping",
                resource));
   #endif
   #ifdef RCTL
           if (diff > 0) {
                   error = rctl_enforce(p, resource, diff);
                   if (error && RACCT_IS_DENIABLE(resource)) {
                           SDT_PROBE(racct, kernel, rusage, set_failure, p,
                               resource, amount, 0, 0);
                           return (error);
                   }
           }
   #endif
           racct_alloc_resource(p->p_racct, resource, diff);
           if (diff > 0)
                   racct_add_cred_locked(p->p_ucred, resource, diff);
           else if (diff < 0)
                   racct_sub_cred_locked(p->p_ucred, resource, -diff);
   
           return (0);
   }
   
   /*
    * Set allocation of 'resource' to 'amount' for process 'p'.
    * Return 0 if it's below limits, or errno, if it's not.
    *
    * Note that decreasing the allocation always returns 0,
    * even if it's above the limit.
    */
   int
   racct_set(struct proc *p, int resource, uint64_t amount)
   {
           int error;
   
           mtx_lock(&racct_lock);
           error = racct_set_locked(p, resource, amount);
           mtx_unlock(&racct_lock);
           return (error);
   }
   
   void
   racct_set_force(struct proc *p, int resource, uint64_t amount)
   {
           int64_t diff;
   
           SDT_PROBE(racct, kernel, rusage, set, p, resource, amount, 0, 0);
   
           /*
            * We need proc lock to dereference p->p_ucred.
            */
           PROC_LOCK_ASSERT(p, MA_OWNED);
   
           mtx_lock(&racct_lock);
           diff = amount - p->p_racct->r_resources[resource];
           racct_alloc_resource(p->p_racct, resource, diff);
           if (diff > 0)
                   racct_add_cred_locked(p->p_ucred, resource, diff);
           else if (diff < 0)
                   racct_sub_cred_locked(p->p_ucred, resource, -diff);
           mtx_unlock(&racct_lock);
   }
   
   /*
    * Returns amount of 'resource' the process 'p' can keep allocated.
    * Allocating more than that would be denied, unless the resource
    * is marked undeniable.  Amount of already allocated resource does
    * not matter.
    */
   uint64_t
   racct_get_limit(struct proc *p, int resource)
   {
   
   #ifdef RCTL
           return (rctl_get_limit(p, resource));
   #else
           return (UINT64_MAX);
   #endif
   }
   
   /*
    * Returns amount of 'resource' the process 'p' can keep allocated.
    * Allocating more than that would be denied, unless the resource
    * is marked undeniable.  Amount of already allocated resource does
    * matter.
    */
   uint64_t
   racct_get_available(struct proc *p, int resource)
   {
   
   #ifdef RCTL
           return (rctl_get_available(p, resource));
   #else
           return (UINT64_MAX);
   #endif
   }
   
   /*
    * Decrease allocation of 'resource' by 'amount' for process 'p'.
    */
   void
   racct_sub(struct proc *p, int resource, uint64_t amount)
   {
   
           SDT_PROBE(racct, kernel, rusage, sub, p, resource, amount, 0, 0);
   
           /*
            * We need proc lock to dereference p->p_ucred.
            */
           PROC_LOCK_ASSERT(p, MA_OWNED);
           KASSERT(RACCT_IS_RECLAIMABLE(resource),
               ("racct_sub: called for non-reclaimable resource %d", resource));
   
           mtx_lock(&racct_lock);
           KASSERT(amount <= p->p_racct->r_resources[resource],
               ("racct_sub: freeing %ju of resource %d, which is more "
                "than allocated %jd for %s (pid %d)", amount, resource,
               (intmax_t)p->p_racct->r_resources[resource], p->p_comm, p->p_pid));
   
           racct_alloc_resource(p->p_racct, resource, -amount);
           racct_sub_cred_locked(p->p_ucred, resource, amount);
           mtx_unlock(&racct_lock);
   }
   
   static void
   racct_sub_cred_locked(struct ucred *cred, int resource, uint64_t amount)
   {
           struct prison *pr;
   
           SDT_PROBE(racct, kernel, rusage, sub_cred, cred, resource, amount,
               0, 0);
   
   #ifdef notyet
           KASSERT(RACCT_IS_RECLAIMABLE(resource),
               ("racct_sub_cred: called for non-reclaimable resource %d",
                resource));
   #endif
   
           racct_alloc_resource(cred->cr_ruidinfo->ui_racct, resource, -amount);
           for (pr = cred->cr_prison; pr != NULL; pr = pr->pr_parent)
                   racct_alloc_resource(pr->pr_prison_racct->prr_racct, resource,
                       -amount);
           racct_alloc_resource(cred->cr_loginclass->lc_racct, resource, -amount);
   }
   
   /*
    * Decrease allocation of 'resource' by 'amount' for credential 'cred'.
    */
   void
   racct_sub_cred(struct ucred *cred, int resource, uint64_t amount)
   {
   
           mtx_lock(&racct_lock);
           racct_sub_cred_locked(cred, resource, amount);
           mtx_unlock(&racct_lock);
   }
   
   /*
    * Inherit resource usage information from the parent process.
    */
   int
   racct_proc_fork(struct proc *parent, struct proc *child)
   {
           int i, error = 0;
   
           /*
            * Create racct for the child process.
            */
           racct_create(&child->p_racct);
   
           PROC_LOCK(parent);
           PROC_LOCK(child);
           mtx_lock(&racct_lock);
   
   #ifdef RCTL
           error = rctl_proc_fork(parent, child);
           if (error != 0)
                   goto out;
   #endif
   
           /*
            * Inherit resource usage.
            */
           for (i = 0; i <= RACCT_MAX; i++) {
                   if (parent->p_racct->r_resources[i] == 0 ||
                       !RACCT_IS_INHERITABLE(i))
                           continue;
   
                   error = racct_set_locked(child, i,
                       parent->p_racct->r_resources[i]);
                   if (error != 0)
                           goto out;
           }
   
           error = racct_add_locked(child, RACCT_NPROC, 1);
           error += racct_add_locked(child, RACCT_NTHR, 1);
   
   out:
           mtx_unlock(&racct_lock);
           PROC_UNLOCK(child);
           PROC_UNLOCK(parent);
   
           if (error != 0)
                   racct_proc_exit(child);
   
           return (error);
   }
   
   /*
    * Called at the end of fork1(), to handle rules that require the process
    * to be fully initialized.
    */
   void
   racct_proc_fork_done(struct proc *child)
   {
   
   #ifdef RCTL
           PROC_LOCK(child);
           mtx_lock(&racct_lock);
           rctl_enforce(child, RACCT_NPROC, 0);
           rctl_enforce(child, RACCT_NTHR, 0);
           mtx_unlock(&racct_lock);
           PROC_UNLOCK(child);
   #endif
   }
   
   void
   racct_proc_exit(struct proc *p)
   {
           int i;
           uint64_t runtime;
   
           PROC_LOCK(p);
           /*
            * We don't need to calculate rux, proc_reap() has already done this.
            */
           runtime = cputick2usec(p->p_rux.rux_runtime);
   #ifdef notyet
           KASSERT(runtime >= p->p_prev_runtime, ("runtime < p_prev_runtime"));
   #else
           if (runtime < p->p_prev_runtime)
                   runtime = p->p_prev_runtime;
   #endif
           mtx_lock(&racct_lock);
           racct_set_locked(p, RACCT_CPU, runtime);
   
           for (i = 0; i <= RACCT_MAX; i++) {
                   if (p->p_racct->r_resources[i] == 0)
                           continue;
                   if (!RACCT_IS_RECLAIMABLE(i))
                           continue;
                   racct_set_locked(p, i, 0);
           }
   
           mtx_unlock(&racct_lock);
           PROC_UNLOCK(p);
   
   #ifdef RCTL
           rctl_racct_release(p->p_racct);
   #endif
           racct_destroy(&p->p_racct);
   }
   
   /*
    * Called after credentials change, to move resource utilisation
    * between raccts.
    */
   void
   racct_proc_ucred_changed(struct proc *p, struct ucred *oldcred,
       struct ucred *newcred)
   {
           struct uidinfo *olduip, *newuip;
           struct loginclass *oldlc, *newlc;
           struct prison *oldpr, *newpr, *pr;
   
           PROC_LOCK_ASSERT(p, MA_NOTOWNED);
   
           newuip = newcred->cr_ruidinfo;
           olduip = oldcred->cr_ruidinfo;
           newlc = newcred->cr_loginclass;
           oldlc = oldcred->cr_loginclass;
           newpr = newcred->cr_prison;
           oldpr = oldcred->cr_prison;
   
           mtx_lock(&racct_lock);
           if (newuip != olduip) {
                   racct_sub_racct(olduip->ui_racct, p->p_racct);
                   racct_add_racct(newuip->ui_racct, p->p_racct);
           }
           if (newlc != oldlc) {
                   racct_sub_racct(oldlc->lc_racct, p->p_racct);
                   racct_add_racct(newlc->lc_racct, p->p_racct);
           }
           if (newpr != oldpr) {
                   for (pr = oldpr; pr != NULL; pr = pr->pr_parent)
                           racct_sub_racct(pr->pr_prison_racct->prr_racct,
                               p->p_racct);
                   for (pr = newpr; pr != NULL; pr = pr->pr_parent)
                           racct_add_racct(pr->pr_prison_racct->prr_racct,
                               p->p_racct);
           }
           mtx_unlock(&racct_lock);
   
   #ifdef RCTL
           rctl_proc_ucred_changed(p, newcred);
   #endif
   }
   
   void
   racct_move(struct racct *dest, struct racct *src)
   {
   
           mtx_lock(&racct_lock);
   
           racct_add_racct(dest, src);
           racct_sub_racct(src, src);
   
           mtx_unlock(&racct_lock);
   }
   
   static void
   racctd(void)
   {
           struct thread *td;
           struct proc *p;
           struct timeval wallclock;
           uint64_t runtime;
   
           for (;;) {
                   sx_slock(&allproc_lock);
   
                   FOREACH_PROC_IN_SYSTEM(p) {
                           if (p->p_state != PRS_NORMAL)
                                   continue;
   
                           microuptime(&wallclock);
                           timevalsub(&wallclock, &p->p_stats->p_start);
                           PROC_LOCK(p);
                           PROC_SLOCK(p);
                           FOREACH_THREAD_IN_PROC(p, td)
                                   ruxagg(p, td);
                           runtime = cputick2usec(p->p_rux.rux_runtime);
                           PROC_SUNLOCK(p);
   #ifdef notyet
                           KASSERT(runtime >= p->p_prev_runtime,
                               ("runtime < p_prev_runtime"));
   #else
                           if (runtime < p->p_prev_runtime)
                                   runtime = p->p_prev_runtime;
   #endif
                           p->p_prev_runtime = runtime;
                           mtx_lock(&racct_lock);
                           racct_set_locked(p, RACCT_CPU, runtime);
                           racct_set_locked(p, RACCT_WALLCLOCK,
                               (uint64_t)wallclock.tv_sec * 1000000 +
                               wallclock.tv_usec);
                           mtx_unlock(&racct_lock);
                           PROC_UNLOCK(p);
                   }
                   sx_sunlock(&allproc_lock);
                   pause("-", hz);
           }
   }
   
   static struct kproc_desc racctd_kp = {
           "racctd",
           racctd,
           NULL
   };
   SYSINIT(racctd, SI_SUB_RACCTD, SI_ORDER_FIRST, kproc_start, &racctd_kp);
   
   static void
   racct_init(void)
   {
   
           racct_zone = uma_zcreate("racct", sizeof(struct racct),
               NULL, NULL, NULL, NULL, UMA_ALIGN_PTR, UMA_ZONE_NOFREE);
           /*
            * XXX: Move this somewhere.
            */
           prison0.pr_prison_racct = prison_racct_find("");
   }
   SYSINIT(racct, SI_SUB_RACCT, SI_ORDER_FIRST, racct_init, NULL);
   
   #else /* !RACCT */
   
   int
   racct_add(struct proc *p, int resource, uint64_t amount)
   {
   
           return (0);
   }
   
   void
   racct_add_cred(struct ucred *cred, int resource, uint64_t amount)
   {
   }
   
   void
   racct_add_force(struct proc *p, int resource, uint64_t amount)
   {
   
           return;
   }
   
   int
   racct_set(struct proc *p, int resource, uint64_t amount)
   {
   
           return (0);
   }
   
   void
   racct_set_force(struct proc *p, int resource, uint64_t amount)
   {
   }
   
   void
   racct_sub(struct proc *p, int resource, uint64_t amount)
   {
   }
   
   void
   racct_sub_cred(struct ucred *cred, int resource, uint64_t amount)
   {
   }
   
   uint64_t
   racct_get_limit(struct proc *p, int resource)
   {
   
           return (UINT64_MAX);
   }
   
   uint64_t
   racct_get_available(struct proc *p, int resource)
   {
   
           return (UINT64_MAX);
   }
   
   void
   racct_create(struct racct **racctp)
   {
   }
   
   void
   racct_destroy(struct racct **racctp)
   {
   }
   
   int
   racct_proc_fork(struct proc *parent, struct proc *child)
   {
   
           return (0);
   }
   
   void
   racct_proc_fork_done(struct proc *child)
   {
   }
   
   void
   racct_proc_exit(struct proc *p)
   {
   }
   
   #endif /* !RACCT */

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