2 * SPDX-License-Identifier: BSD-3-Clause
4 * Copyright (c) 1982, 1986, 1991, 1993
5 * The Regents of the University of California. All rights reserved.
6 * (c) UNIX System Laboratories, Inc.
7 * All or some portions of this file are derived from material licensed
8 * to the University of California by American Telephone and Telegraph
9 * Co. or Unix System Laboratories, Inc. and are reproduced herein with
10 * the permission of UNIX System Laboratories, Inc.
12 * Redistribution and use in source and binary forms, with or without
13 * modification, are permitted provided that the following conditions
15 * 1. Redistributions of source code must retain the above copyright
16 * notice, this list of conditions and the following disclaimer.
17 * 2. Redistributions in binary form must reproduce the above copyright
18 * notice, this list of conditions and the following disclaimer in the
19 * documentation and/or other materials provided with the distribution.
20 * 3. Neither the name of the University nor the names of its contributors
21 * may be used to endorse or promote products derived from this software
22 * without specific prior written permission.
24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
36 * @(#)kern_resource.c 8.5 (Berkeley) 1/21/94
39 #include <sys/cdefs.h>
40 __FBSDID("$FreeBSD$");
42 #include <sys/param.h>
43 #include <sys/systm.h>
44 #include <sys/sysproto.h>
46 #include <sys/kernel.h>
48 #include <sys/malloc.h>
49 #include <sys/mutex.h>
52 #include <sys/refcount.h>
53 #include <sys/racct.h>
54 #include <sys/resourcevar.h>
55 #include <sys/rwlock.h>
56 #include <sys/sched.h>
58 #include <sys/syscallsubr.h>
59 #include <sys/sysctl.h>
60 #include <sys/sysent.h>
65 #include <vm/vm_param.h>
67 #include <vm/vm_map.h>
69 static MALLOC_DEFINE(M_PLIMIT, "plimit", "plimit structures");
70 static MALLOC_DEFINE(M_UIDINFO, "uidinfo", "uidinfo structures");
71 #define UIHASH(uid) (&uihashtbl[(uid) & uihash])
72 static struct rwlock uihashtbl_lock;
73 static LIST_HEAD(uihashhead, uidinfo) *uihashtbl;
74 static u_long uihash; /* size of hash table - 1 */
76 static void calcru1(struct proc *p, struct rusage_ext *ruxp,
77 struct timeval *up, struct timeval *sp);
78 static int donice(struct thread *td, struct proc *chgp, int n);
79 static struct uidinfo *uilookup(uid_t uid);
80 static void ruxagg_ext_locked(struct rusage_ext *rux, struct thread *td);
83 * Resource controls and accounting.
85 #ifndef _SYS_SYSPROTO_H_
86 struct getpriority_args {
92 sys_getpriority(struct thread *td, struct getpriority_args *uap)
95 return (kern_getpriority(td, uap->which, uap->who));
99 kern_getpriority(struct thread *td, int which, int who)
110 low = td->td_proc->p_nice;
115 if (p_cansee(td, p) == 0)
122 sx_slock(&proctree_lock);
124 pg = td->td_proc->p_pgrp;
129 sx_sunlock(&proctree_lock);
133 sx_sunlock(&proctree_lock);
134 LIST_FOREACH(p, &pg->pg_members, p_pglist) {
136 if (p->p_state == PRS_NORMAL &&
137 p_cansee(td, p) == 0) {
148 who = td->td_ucred->cr_uid;
149 sx_slock(&allproc_lock);
150 FOREACH_PROC_IN_SYSTEM(p) {
152 if (p->p_state == PRS_NORMAL &&
153 p_cansee(td, p) == 0 &&
154 p->p_ucred->cr_uid == who) {
160 sx_sunlock(&allproc_lock);
167 if (low == PRIO_MAX + 1 && error == 0)
169 td->td_retval[0] = low;
173 #ifndef _SYS_SYSPROTO_H_
174 struct setpriority_args {
181 sys_setpriority(struct thread *td, struct setpriority_args *uap)
184 return (kern_setpriority(td, uap->which, uap->who, uap->prio));
188 kern_setpriority(struct thread *td, int which, int who, int prio)
190 struct proc *curp, *p;
192 int found = 0, error = 0;
199 error = donice(td, curp, prio);
205 error = p_cansee(td, p);
207 error = donice(td, p, prio);
214 sx_slock(&proctree_lock);
221 sx_sunlock(&proctree_lock);
225 sx_sunlock(&proctree_lock);
226 LIST_FOREACH(p, &pg->pg_members, p_pglist) {
228 if (p->p_state == PRS_NORMAL &&
229 p_cansee(td, p) == 0) {
230 error = donice(td, p, prio);
240 who = td->td_ucred->cr_uid;
241 sx_slock(&allproc_lock);
242 FOREACH_PROC_IN_SYSTEM(p) {
244 if (p->p_state == PRS_NORMAL &&
245 p->p_ucred->cr_uid == who &&
246 p_cansee(td, p) == 0) {
247 error = donice(td, p, prio);
252 sx_sunlock(&allproc_lock);
259 if (found == 0 && error == 0)
265 * Set "nice" for a (whole) process.
268 donice(struct thread *td, struct proc *p, int n)
272 PROC_LOCK_ASSERT(p, MA_OWNED);
273 if ((error = p_cansched(td, p)))
279 if (n < p->p_nice && priv_check(td, PRIV_SCHED_SETPRIORITY) != 0)
285 static int unprivileged_idprio;
286 SYSCTL_INT(_security_bsd, OID_AUTO, unprivileged_idprio, CTLFLAG_RW,
287 &unprivileged_idprio, 0, "Allow non-root users to set an idle priority");
290 * Set realtime priority for LWP.
292 #ifndef _SYS_SYSPROTO_H_
293 struct rtprio_thread_args {
300 sys_rtprio_thread(struct thread *td, struct rtprio_thread_args *uap)
307 /* Perform copyin before acquiring locks if needed. */
308 if (uap->function == RTP_SET)
309 cierror = copyin(uap->rtp, &rtp, sizeof(struct rtprio));
313 if (uap->lwpid == 0 || uap->lwpid == td->td_tid) {
318 td1 = tdfind(uap->lwpid, -1);
324 switch (uap->function) {
326 if ((error = p_cansee(td, p)))
328 pri_to_rtp(td1, &rtp);
330 return (copyout(&rtp, uap->rtp, sizeof(struct rtprio)));
332 if ((error = p_cansched(td, p)) || (error = cierror))
335 /* Disallow setting rtprio in most cases if not superuser. */
338 * Realtime priority has to be restricted for reasons which
339 * should be obvious. However, for idleprio processes, there is
340 * a potential for system deadlock if an idleprio process gains
341 * a lock on a resource that other processes need (and the
342 * idleprio process can't run due to a CPU-bound normal
343 * process). Fix me! XXX
345 * This problem is not only related to idleprio process.
346 * A user level program can obtain a file lock and hold it
347 * indefinitely. Additionally, without idleprio processes it is
348 * still conceivable that a program with low priority will never
349 * get to run. In short, allowing this feature might make it
350 * easier to lock a resource indefinitely, but it is not the
351 * only thing that makes it possible.
353 if (RTP_PRIO_BASE(rtp.type) == RTP_PRIO_REALTIME ||
354 (RTP_PRIO_BASE(rtp.type) == RTP_PRIO_IDLE &&
355 unprivileged_idprio == 0)) {
356 error = priv_check(td, PRIV_SCHED_RTPRIO);
360 error = rtp_to_pri(&rtp, td1);
371 * Set realtime priority.
373 #ifndef _SYS_SYSPROTO_H_
381 sys_rtprio(struct thread *td, struct rtprio_args *uap)
388 /* Perform copyin before acquiring locks if needed. */
389 if (uap->function == RTP_SET)
390 cierror = copyin(uap->rtp, &rtp, sizeof(struct rtprio));
403 switch (uap->function) {
405 if ((error = p_cansee(td, p)))
408 * Return OUR priority if no pid specified,
409 * or if one is, report the highest priority
410 * in the process. There isn't much more you can do as
411 * there is only room to return a single priority.
412 * Note: specifying our own pid is not the same
413 * as leaving it zero.
416 pri_to_rtp(td, &rtp);
420 rtp.type = RTP_PRIO_IDLE;
421 rtp.prio = RTP_PRIO_MAX;
422 FOREACH_THREAD_IN_PROC(p, tdp) {
423 pri_to_rtp(tdp, &rtp2);
424 if (rtp2.type < rtp.type ||
425 (rtp2.type == rtp.type &&
426 rtp2.prio < rtp.prio)) {
427 rtp.type = rtp2.type;
428 rtp.prio = rtp2.prio;
433 return (copyout(&rtp, uap->rtp, sizeof(struct rtprio)));
435 if ((error = p_cansched(td, p)) || (error = cierror))
439 * Disallow setting rtprio in most cases if not superuser.
440 * See the comment in sys_rtprio_thread about idprio
441 * threads holding a lock.
443 if (RTP_PRIO_BASE(rtp.type) == RTP_PRIO_REALTIME ||
444 (RTP_PRIO_BASE(rtp.type) == RTP_PRIO_IDLE &&
445 !unprivileged_idprio)) {
446 error = priv_check(td, PRIV_SCHED_RTPRIO);
452 * If we are setting our own priority, set just our
453 * thread but if we are doing another process,
454 * do all the threads on that process. If we
455 * specify our own pid we do the latter.
458 error = rtp_to_pri(&rtp, td);
460 FOREACH_THREAD_IN_PROC(p, td) {
461 if ((error = rtp_to_pri(&rtp, td)) != 0)
475 rtp_to_pri(struct rtprio *rtp, struct thread *td)
477 u_char newpri, oldclass, oldpri;
479 switch (RTP_PRIO_BASE(rtp->type)) {
480 case RTP_PRIO_REALTIME:
481 if (rtp->prio > RTP_PRIO_MAX)
483 newpri = PRI_MIN_REALTIME + rtp->prio;
485 case RTP_PRIO_NORMAL:
486 if (rtp->prio > (PRI_MAX_TIMESHARE - PRI_MIN_TIMESHARE))
488 newpri = PRI_MIN_TIMESHARE + rtp->prio;
491 if (rtp->prio > RTP_PRIO_MAX)
493 newpri = PRI_MIN_IDLE + rtp->prio;
500 oldclass = td->td_pri_class;
501 sched_class(td, rtp->type); /* XXX fix */
502 oldpri = td->td_user_pri;
503 sched_user_prio(td, newpri);
504 if (td->td_user_pri != oldpri && (oldclass != RTP_PRIO_NORMAL ||
505 td->td_pri_class != RTP_PRIO_NORMAL))
506 sched_prio(td, td->td_user_pri);
507 if (TD_ON_UPILOCK(td) && oldpri != newpri) {
510 umtx_pi_adjust(td, oldpri);
518 pri_to_rtp(struct thread *td, struct rtprio *rtp)
522 switch (PRI_BASE(td->td_pri_class)) {
524 rtp->prio = td->td_base_user_pri - PRI_MIN_REALTIME;
527 rtp->prio = td->td_base_user_pri - PRI_MIN_TIMESHARE;
530 rtp->prio = td->td_base_user_pri - PRI_MIN_IDLE;
535 rtp->type = td->td_pri_class;
539 #if defined(COMPAT_43)
540 #ifndef _SYS_SYSPROTO_H_
541 struct osetrlimit_args {
547 osetrlimit(struct thread *td, struct osetrlimit_args *uap)
553 if ((error = copyin(uap->rlp, &olim, sizeof(struct orlimit))))
555 lim.rlim_cur = olim.rlim_cur;
556 lim.rlim_max = olim.rlim_max;
557 error = kern_setrlimit(td, uap->which, &lim);
561 #ifndef _SYS_SYSPROTO_H_
562 struct ogetrlimit_args {
568 ogetrlimit(struct thread *td, struct ogetrlimit_args *uap)
574 if (uap->which >= RLIM_NLIMITS)
576 lim_rlimit(td, uap->which, &rl);
579 * XXX would be more correct to convert only RLIM_INFINITY to the
580 * old RLIM_INFINITY and fail with EOVERFLOW for other larger
581 * values. Most 64->32 and 32->16 conversions, including not
582 * unimportant ones of uids are even more broken than what we
583 * do here (they blindly truncate). We don't do this correctly
584 * here since we have little experience with EOVERFLOW yet.
585 * Elsewhere, getuid() can't fail...
587 olim.rlim_cur = rl.rlim_cur > 0x7fffffff ? 0x7fffffff : rl.rlim_cur;
588 olim.rlim_max = rl.rlim_max > 0x7fffffff ? 0x7fffffff : rl.rlim_max;
589 error = copyout(&olim, uap->rlp, sizeof(olim));
592 #endif /* COMPAT_43 */
594 #ifndef _SYS_SYSPROTO_H_
595 struct __setrlimit_args {
601 sys_setrlimit(struct thread *td, struct __setrlimit_args *uap)
606 if ((error = copyin(uap->rlp, &alim, sizeof(struct rlimit))))
608 error = kern_setrlimit(td, uap->which, &alim);
620 PROC_LOCK_ASSERT(p, MA_OWNED);
622 * Check if the process exceeds its cpu resource allocation. If
623 * it reaches the max, arrange to kill the process in ast().
625 if (p->p_cpulimit == RLIM_INFINITY)
628 FOREACH_THREAD_IN_PROC(p, td) {
632 if (p->p_rux.rux_runtime > p->p_cpulimit * cpu_tickrate()) {
633 lim_rlimit_proc(p, RLIMIT_CPU, &rlim);
634 if (p->p_rux.rux_runtime >= rlim.rlim_max * cpu_tickrate()) {
635 killproc(p, "exceeded maximum CPU limit");
637 if (p->p_cpulimit < rlim.rlim_max)
639 kern_psignal(p, SIGXCPU);
642 if ((p->p_flag & P_WEXIT) == 0)
643 callout_reset_sbt(&p->p_limco, SBT_1S, 0,
644 lim_cb, p, C_PREL(1));
648 kern_setrlimit(struct thread *td, u_int which, struct rlimit *limp)
651 return (kern_proc_setrlimit(td, td->td_proc, which, limp));
655 kern_proc_setrlimit(struct thread *td, struct proc *p, u_int which,
658 struct plimit *newlim, *oldlim;
659 struct rlimit *alimp;
660 struct rlimit oldssiz;
663 if (which >= RLIM_NLIMITS)
667 * Preserve historical bugs by treating negative limits as unsigned.
669 if (limp->rlim_cur < 0)
670 limp->rlim_cur = RLIM_INFINITY;
671 if (limp->rlim_max < 0)
672 limp->rlim_max = RLIM_INFINITY;
674 oldssiz.rlim_cur = 0;
675 newlim = lim_alloc();
678 alimp = &oldlim->pl_rlimit[which];
679 if (limp->rlim_cur > alimp->rlim_max ||
680 limp->rlim_max > alimp->rlim_max)
681 if ((error = priv_check(td, PRIV_PROC_SETRLIMIT))) {
686 if (limp->rlim_cur > limp->rlim_max)
687 limp->rlim_cur = limp->rlim_max;
688 lim_copy(newlim, oldlim);
689 alimp = &newlim->pl_rlimit[which];
693 if (limp->rlim_cur != RLIM_INFINITY &&
694 p->p_cpulimit == RLIM_INFINITY)
695 callout_reset_sbt(&p->p_limco, SBT_1S, 0,
696 lim_cb, p, C_PREL(1));
697 p->p_cpulimit = limp->rlim_cur;
700 if (limp->rlim_cur > maxdsiz)
701 limp->rlim_cur = maxdsiz;
702 if (limp->rlim_max > maxdsiz)
703 limp->rlim_max = maxdsiz;
707 if (limp->rlim_cur > maxssiz)
708 limp->rlim_cur = maxssiz;
709 if (limp->rlim_max > maxssiz)
710 limp->rlim_max = maxssiz;
712 if (p->p_sysent->sv_fixlimit != NULL)
713 p->p_sysent->sv_fixlimit(&oldssiz,
718 if (limp->rlim_cur > maxfilesperproc)
719 limp->rlim_cur = maxfilesperproc;
720 if (limp->rlim_max > maxfilesperproc)
721 limp->rlim_max = maxfilesperproc;
725 if (limp->rlim_cur > maxprocperuid)
726 limp->rlim_cur = maxprocperuid;
727 if (limp->rlim_max > maxprocperuid)
728 limp->rlim_max = maxprocperuid;
729 if (limp->rlim_cur < 1)
731 if (limp->rlim_max < 1)
735 if (p->p_sysent->sv_fixlimit != NULL)
736 p->p_sysent->sv_fixlimit(limp, which);
743 if (which == RLIMIT_STACK &&
745 * Skip calls from exec_new_vmspace(), done when stack is
748 (td != curthread || (p->p_flag & P_INEXEC) == 0)) {
750 * Stack is allocated to the max at exec time with only
751 * "rlim_cur" bytes accessible. If stack limit is going
752 * up make more accessible, if going down make inaccessible.
754 if (limp->rlim_cur != oldssiz.rlim_cur) {
759 if (limp->rlim_cur > oldssiz.rlim_cur) {
760 prot = p->p_sysent->sv_stackprot;
761 size = limp->rlim_cur - oldssiz.rlim_cur;
762 addr = p->p_sysent->sv_usrstack -
766 size = oldssiz.rlim_cur - limp->rlim_cur;
767 addr = p->p_sysent->sv_usrstack -
770 addr = trunc_page(addr);
771 size = round_page(size);
772 (void)vm_map_protect(&p->p_vmspace->vm_map,
773 addr, addr + size, prot, 0,
774 VM_MAP_PROTECT_SET_PROT);
781 #ifndef _SYS_SYSPROTO_H_
782 struct __getrlimit_args {
789 sys_getrlimit(struct thread *td, struct __getrlimit_args *uap)
794 if (uap->which >= RLIM_NLIMITS)
796 lim_rlimit(td, uap->which, &rlim);
797 error = copyout(&rlim, uap->rlp, sizeof(struct rlimit));
802 * Transform the running time and tick information for children of proc p
803 * into user and system time usage.
806 calccru(struct proc *p, struct timeval *up, struct timeval *sp)
809 PROC_LOCK_ASSERT(p, MA_OWNED);
810 calcru1(p, &p->p_crux, up, sp);
814 * Transform the running time and tick information in proc p into user
815 * and system time usage. If appropriate, include the current time slice
819 calcru(struct proc *p, struct timeval *up, struct timeval *sp)
824 PROC_LOCK_ASSERT(p, MA_OWNED);
825 PROC_STATLOCK_ASSERT(p, MA_OWNED);
827 * If we are getting stats for the current process, then add in the
828 * stats that this thread has accumulated in its current time slice.
829 * We reset the thread and CPU state as if we had performed a context
833 if (td->td_proc == p) {
835 runtime = u - PCPU_GET(switchtime);
836 td->td_runtime += runtime;
837 td->td_incruntime += runtime;
838 PCPU_SET(switchtime, u);
840 /* Make sure the per-thread stats are current. */
841 FOREACH_THREAD_IN_PROC(p, td) {
842 if (td->td_incruntime == 0)
846 calcru1(p, &p->p_rux, up, sp);
849 /* Collect resource usage for a single thread. */
851 rufetchtd(struct thread *td, struct rusage *ru)
857 PROC_STATLOCK_ASSERT(p, MA_OWNED);
858 THREAD_LOCK_ASSERT(td, MA_OWNED);
860 * If we are getting stats for the current thread, then add in the
861 * stats that this thread has accumulated in its current time slice.
862 * We reset the thread and CPU state as if we had performed a context
865 if (td == curthread) {
867 runtime = u - PCPU_GET(switchtime);
868 td->td_runtime += runtime;
869 td->td_incruntime += runtime;
870 PCPU_SET(switchtime, u);
872 ruxagg_locked(p, td);
874 calcru1(p, &td->td_rux, &ru->ru_utime, &ru->ru_stime);
877 /* XXX: the MI version is too slow to use: */
878 #ifndef __HAVE_INLINE_FLSLL
879 #define flsll(x) (fls((x) >> 32) != 0 ? fls((x) >> 32) + 32 : fls(x))
883 mul64_by_fraction(uint64_t a, uint64_t b, uint64_t c)
885 uint64_t acc, bh, bl;
889 * Calculate (a * b) / c accurately enough without overflowing. c
890 * must be nonzero, and its top bit must be 0. a or b must be
891 * <= c, and the implementation is tuned for b <= c.
893 * The comments about times are for use in calcru1() with units of
894 * microseconds for 'a' and stathz ticks at 128 Hz for b and c.
896 * Let n be the number of top zero bits in c. Each iteration
897 * either returns, or reduces b by right shifting it by at least n.
898 * The number of iterations is at most 1 + 64 / n, and the error is
899 * at most the number of iterations.
901 * It is very unusual to need even 2 iterations. Previous
902 * implementations overflowed essentially by returning early in the
903 * first iteration, with n = 38 giving overflow at 105+ hours and
904 * n = 32 giving overlow at at 388+ days despite a more careful
905 * calculation. 388 days is a reasonable uptime, and the calculation
906 * needs to work for the uptime times the number of CPUs since 'a'
909 if (a >= (uint64_t)1 << 63)
910 return (0); /* Unsupported arg -- can't happen. */
912 for (i = 0; i < 128; i++) {
916 /* Up to 105 hours on first iteration. */
917 return (acc + (a * b) / c);
920 * This reduction is based on a = q * c + r, with the
921 * remainder r < c. 'a' may be large to start, and
922 * moving bits from b into 'a' at the end of the loop
923 * sets the top bit of 'a', so the reduction makes
924 * significant progress.
930 /* Up to 388 days on first iteration. */
931 return (acc + (a * b) / c);
935 * This step writes a * b as a * ((bh << s) + bl) =
936 * a * (bh << s) + a * bl = (a << s) * bh + a * bl. The 2
937 * additive terms are handled separately. Splitting in
938 * this way is linear except for rounding errors.
940 * s = 64 - sa is the maximum such that a << s fits in 64
941 * bits. Since a < c and c has at least 1 zero top bit,
942 * sa < 64 and s > 0. Thus this step makes progress by
943 * reducing b (it increases 'a', but taking remainders on
944 * the next iteration completes the reduction).
946 * Finally, the choice for s is just what is needed to keep
947 * a * bl from overflowing, so we don't need complications
948 * like a recursive call mul64_by_fraction(a, bl, c) to
949 * handle the second additive term.
958 return (0); /* Algorithm failure -- can't happen. */
962 calcru1(struct proc *p, struct rusage_ext *ruxp, struct timeval *up,
965 /* {user, system, interrupt, total} {ticks, usec}: */
966 uint64_t ut, uu, st, su, it, tt, tu;
968 ut = ruxp->rux_uticks;
969 st = ruxp->rux_sticks;
970 it = ruxp->rux_iticks;
973 /* Avoid divide by zero */
977 tu = cputick2usec(ruxp->rux_runtime);
978 if ((int64_t)tu < 0) {
979 /* XXX: this should be an assert /phk */
980 printf("calcru: negative runtime of %jd usec for pid %d (%s)\n",
981 (intmax_t)tu, p->p_pid, p->p_comm);
985 /* Subdivide tu. Avoid overflow in the multiplications. */
986 if (__predict_true(tu <= ((uint64_t)1 << 38) && tt <= (1 << 26))) {
987 /* Up to 76 hours when stathz is 128. */
991 uu = mul64_by_fraction(tu, ut, tt);
992 su = mul64_by_fraction(tu, st, tt);
995 if (tu >= ruxp->rux_tu) {
997 * The normal case, time increased.
998 * Enforce monotonicity of bucketed numbers.
1000 if (uu < ruxp->rux_uu)
1002 if (su < ruxp->rux_su)
1004 } else if (tu + 3 > ruxp->rux_tu || 101 * tu > 100 * ruxp->rux_tu) {
1006 * When we calibrate the cputicker, it is not uncommon to
1007 * see the presumably fixed frequency increase slightly over
1008 * time as a result of thermal stabilization and NTP
1009 * discipline (of the reference clock). We therefore ignore
1010 * a bit of backwards slop because we expect to catch up
1011 * shortly. We use a 3 microsecond limit to catch low
1012 * counts and a 1% limit for high counts.
1017 } else { /* tu < ruxp->rux_tu */
1019 * What happened here was likely that a laptop, which ran at
1020 * a reduced clock frequency at boot, kicked into high gear.
1021 * The wisdom of spamming this message in that case is
1022 * dubious, but it might also be indicative of something
1023 * serious, so lets keep it and hope laptops can be made
1024 * more truthful about their CPU speed via ACPI.
1026 printf("calcru: runtime went backwards from %ju usec "
1027 "to %ju usec for pid %d (%s)\n",
1028 (uintmax_t)ruxp->rux_tu, (uintmax_t)tu,
1029 p->p_pid, p->p_comm);
1036 up->tv_sec = uu / 1000000;
1037 up->tv_usec = uu % 1000000;
1038 sp->tv_sec = su / 1000000;
1039 sp->tv_usec = su % 1000000;
1042 #ifndef _SYS_SYSPROTO_H_
1043 struct getrusage_args {
1045 struct rusage *rusage;
1049 sys_getrusage(struct thread *td, struct getrusage_args *uap)
1054 error = kern_getrusage(td, uap->who, &ru);
1056 error = copyout(&ru, uap->rusage, sizeof(struct rusage));
1061 kern_getrusage(struct thread *td, int who, struct rusage *rup)
1071 rufetchcalc(p, rup, &rup->ru_utime,
1075 case RUSAGE_CHILDREN:
1076 *rup = p->p_stats->p_cru;
1077 calccru(p, &rup->ru_utime, &rup->ru_stime);
1096 rucollect(struct rusage *ru, struct rusage *ru2)
1101 if (ru->ru_maxrss < ru2->ru_maxrss)
1102 ru->ru_maxrss = ru2->ru_maxrss;
1104 ip2 = &ru2->ru_first;
1105 for (i = &ru->ru_last - &ru->ru_first; i >= 0; i--)
1110 ruadd(struct rusage *ru, struct rusage_ext *rux, struct rusage *ru2,
1111 struct rusage_ext *rux2)
1114 rux->rux_runtime += rux2->rux_runtime;
1115 rux->rux_uticks += rux2->rux_uticks;
1116 rux->rux_sticks += rux2->rux_sticks;
1117 rux->rux_iticks += rux2->rux_iticks;
1118 rux->rux_uu += rux2->rux_uu;
1119 rux->rux_su += rux2->rux_su;
1120 rux->rux_tu += rux2->rux_tu;
1125 * Aggregate tick counts into the proc's rusage_ext.
1128 ruxagg_ext_locked(struct rusage_ext *rux, struct thread *td)
1131 rux->rux_runtime += td->td_incruntime;
1132 rux->rux_uticks += td->td_uticks;
1133 rux->rux_sticks += td->td_sticks;
1134 rux->rux_iticks += td->td_iticks;
1138 ruxagg_locked(struct proc *p, struct thread *td)
1140 THREAD_LOCK_ASSERT(td, MA_OWNED);
1141 PROC_STATLOCK_ASSERT(td->td_proc, MA_OWNED);
1143 ruxagg_ext_locked(&p->p_rux, td);
1144 ruxagg_ext_locked(&td->td_rux, td);
1145 td->td_incruntime = 0;
1152 ruxagg(struct proc *p, struct thread *td)
1156 ruxagg_locked(p, td);
1161 * Update the rusage_ext structure and fetch a valid aggregate rusage
1162 * for proc p if storage for one is supplied.
1165 rufetch(struct proc *p, struct rusage *ru)
1169 PROC_STATLOCK_ASSERT(p, MA_OWNED);
1172 if (p->p_numthreads > 0) {
1173 FOREACH_THREAD_IN_PROC(p, td) {
1175 rucollect(ru, &td->td_ru);
1181 * Atomically perform a rufetch and a calcru together.
1182 * Consumers, can safely assume the calcru is executed only once
1183 * rufetch is completed.
1186 rufetchcalc(struct proc *p, struct rusage *ru, struct timeval *up,
1197 * Allocate a new resource limits structure and initialize its
1198 * reference count and mutex pointer.
1203 struct plimit *limp;
1205 limp = malloc(sizeof(struct plimit), M_PLIMIT, M_WAITOK);
1206 refcount_init(&limp->pl_refcnt, 1);
1211 lim_hold(struct plimit *limp)
1214 refcount_acquire(&limp->pl_refcnt);
1219 lim_fork(struct proc *p1, struct proc *p2)
1222 PROC_LOCK_ASSERT(p1, MA_OWNED);
1223 PROC_LOCK_ASSERT(p2, MA_OWNED);
1225 p2->p_limit = lim_hold(p1->p_limit);
1226 callout_init_mtx(&p2->p_limco, &p2->p_mtx, 0);
1227 if (p1->p_cpulimit != RLIM_INFINITY)
1228 callout_reset_sbt(&p2->p_limco, SBT_1S, 0,
1229 lim_cb, p2, C_PREL(1));
1233 lim_free(struct plimit *limp)
1236 if (refcount_release(&limp->pl_refcnt))
1237 free((void *)limp, M_PLIMIT);
1241 lim_freen(struct plimit *limp, int n)
1244 if (refcount_releasen(&limp->pl_refcnt, n))
1245 free((void *)limp, M_PLIMIT);
1249 * Make a copy of the plimit structure.
1250 * We share these structures copy-on-write after fork.
1253 lim_copy(struct plimit *dst, struct plimit *src)
1256 KASSERT(dst->pl_refcnt <= 1, ("lim_copy to shared limit"));
1257 bcopy(src->pl_rlimit, dst->pl_rlimit, sizeof(src->pl_rlimit));
1261 * Return the hard limit for a particular system resource. The
1262 * which parameter specifies the index into the rlimit array.
1265 lim_max(struct thread *td, int which)
1269 lim_rlimit(td, which, &rl);
1270 return (rl.rlim_max);
1274 lim_max_proc(struct proc *p, int which)
1278 lim_rlimit_proc(p, which, &rl);
1279 return (rl.rlim_max);
1283 * Return the current (soft) limit for a particular system resource.
1284 * The which parameter which specifies the index into the rlimit array
1287 (lim_cur)(struct thread *td, int which)
1291 lim_rlimit(td, which, &rl);
1292 return (rl.rlim_cur);
1296 lim_cur_proc(struct proc *p, int which)
1300 lim_rlimit_proc(p, which, &rl);
1301 return (rl.rlim_cur);
1305 * Return a copy of the entire rlimit structure for the system limit
1306 * specified by 'which' in the rlimit structure pointed to by 'rlp'.
1309 lim_rlimit(struct thread *td, int which, struct rlimit *rlp)
1311 struct proc *p = td->td_proc;
1313 MPASS(td == curthread);
1314 KASSERT(which >= 0 && which < RLIM_NLIMITS,
1315 ("request for invalid resource limit"));
1316 *rlp = td->td_limit->pl_rlimit[which];
1317 if (p->p_sysent->sv_fixlimit != NULL)
1318 p->p_sysent->sv_fixlimit(rlp, which);
1322 lim_rlimit_proc(struct proc *p, int which, struct rlimit *rlp)
1325 PROC_LOCK_ASSERT(p, MA_OWNED);
1326 KASSERT(which >= 0 && which < RLIM_NLIMITS,
1327 ("request for invalid resource limit"));
1328 *rlp = p->p_limit->pl_rlimit[which];
1329 if (p->p_sysent->sv_fixlimit != NULL)
1330 p->p_sysent->sv_fixlimit(rlp, which);
1337 uihashtbl = hashinit(maxproc / 16, M_UIDINFO, &uihash);
1338 rw_init(&uihashtbl_lock, "uidinfo hash");
1342 * Look up a uidinfo struct for the parameter uid.
1343 * uihashtbl_lock must be locked.
1344 * Increase refcount on uidinfo struct returned.
1346 static struct uidinfo *
1349 struct uihashhead *uipp;
1350 struct uidinfo *uip;
1352 rw_assert(&uihashtbl_lock, RA_LOCKED);
1354 LIST_FOREACH(uip, uipp, ui_hash)
1355 if (uip->ui_uid == uid) {
1364 * Find or allocate a struct uidinfo for a particular uid.
1365 * Returns with uidinfo struct referenced.
1366 * uifree() should be called on a struct uidinfo when released.
1371 struct uidinfo *new_uip, *uip;
1374 cred = curthread->td_ucred;
1375 if (cred->cr_uidinfo->ui_uid == uid) {
1376 uip = cred->cr_uidinfo;
1379 } else if (cred->cr_ruidinfo->ui_uid == uid) {
1380 uip = cred->cr_ruidinfo;
1385 rw_rlock(&uihashtbl_lock);
1386 uip = uilookup(uid);
1387 rw_runlock(&uihashtbl_lock);
1391 new_uip = malloc(sizeof(*new_uip), M_UIDINFO, M_WAITOK | M_ZERO);
1392 racct_create(&new_uip->ui_racct);
1393 refcount_init(&new_uip->ui_ref, 1);
1394 new_uip->ui_uid = uid;
1396 rw_wlock(&uihashtbl_lock);
1398 * There's a chance someone created our uidinfo while we
1399 * were in malloc and not holding the lock, so we have to
1400 * make sure we don't insert a duplicate uidinfo.
1402 if ((uip = uilookup(uid)) == NULL) {
1403 LIST_INSERT_HEAD(UIHASH(uid), new_uip, ui_hash);
1404 rw_wunlock(&uihashtbl_lock);
1407 rw_wunlock(&uihashtbl_lock);
1408 racct_destroy(&new_uip->ui_racct);
1409 free(new_uip, M_UIDINFO);
1415 * Place another refcount on a uidinfo struct.
1418 uihold(struct uidinfo *uip)
1421 refcount_acquire(&uip->ui_ref);
1425 * Since uidinfo structs have a long lifetime, we use an
1426 * opportunistic refcounting scheme to avoid locking the lookup hash
1429 * If the refcount hits 0, we need to free the structure,
1430 * which means we need to lock the hash.
1432 * After locking the struct and lowering the refcount, if we find
1433 * that we don't need to free, simply unlock and return.
1435 * If refcount lowering results in need to free, bump the count
1436 * back up, lose the lock and acquire the locks in the proper
1437 * order to try again.
1440 uifree(struct uidinfo *uip)
1443 if (refcount_release_if_not_last(&uip->ui_ref))
1446 rw_wlock(&uihashtbl_lock);
1447 if (refcount_release(&uip->ui_ref) == 0) {
1448 rw_wunlock(&uihashtbl_lock);
1452 racct_destroy(&uip->ui_racct);
1453 LIST_REMOVE(uip, ui_hash);
1454 rw_wunlock(&uihashtbl_lock);
1456 if (uip->ui_sbsize != 0)
1457 printf("freeing uidinfo: uid = %d, sbsize = %ld\n",
1458 uip->ui_uid, uip->ui_sbsize);
1459 if (uip->ui_proccnt != 0)
1460 printf("freeing uidinfo: uid = %d, proccnt = %ld\n",
1461 uip->ui_uid, uip->ui_proccnt);
1462 if (uip->ui_vmsize != 0)
1463 printf("freeing uidinfo: uid = %d, swapuse = %lld\n",
1464 uip->ui_uid, (unsigned long long)uip->ui_vmsize);
1465 free(uip, M_UIDINFO);
1470 ui_racct_foreach(void (*callback)(struct racct *racct,
1471 void *arg2, void *arg3), void (*pre)(void), void (*post)(void),
1472 void *arg2, void *arg3)
1474 struct uidinfo *uip;
1475 struct uihashhead *uih;
1477 rw_rlock(&uihashtbl_lock);
1480 for (uih = &uihashtbl[uihash]; uih >= uihashtbl; uih--) {
1481 LIST_FOREACH(uip, uih, ui_hash) {
1482 (callback)(uip->ui_racct, arg2, arg3);
1487 rw_runlock(&uihashtbl_lock);
1492 chglimit(struct uidinfo *uip, long *limit, int diff, rlim_t max, const char *name)
1496 /* Don't allow them to exceed max, but allow subtraction. */
1497 new = atomic_fetchadd_long(limit, (long)diff) + diff;
1498 if (diff > 0 && max != 0) {
1499 if (new < 0 || new > max) {
1500 atomic_subtract_long(limit, (long)diff);
1504 printf("negative %s for uid = %d\n", name, uip->ui_uid);
1509 * Change the count associated with number of processes
1510 * a given user is using. When 'max' is 0, don't enforce a limit
1513 chgproccnt(struct uidinfo *uip, int diff, rlim_t max)
1516 return (chglimit(uip, &uip->ui_proccnt, diff, max, "proccnt"));
1520 * Change the total socket buffer size a user has used.
1523 chgsbsize(struct uidinfo *uip, u_int *hiwat, u_int to, rlim_t max)
1528 if (diff > 0 && max == 0) {
1531 rv = chglimit(uip, &uip->ui_sbsize, diff, max, "sbsize");
1539 * Change the count associated with number of pseudo-terminals
1540 * a given user is using. When 'max' is 0, don't enforce a limit
1543 chgptscnt(struct uidinfo *uip, int diff, rlim_t max)
1546 return (chglimit(uip, &uip->ui_ptscnt, diff, max, "ptscnt"));
1550 chgkqcnt(struct uidinfo *uip, int diff, rlim_t max)
1553 return (chglimit(uip, &uip->ui_kqcnt, diff, max, "kqcnt"));
1557 chgumtxcnt(struct uidinfo *uip, int diff, rlim_t max)
1560 return (chglimit(uip, &uip->ui_umtxcnt, diff, max, "umtxcnt"));