kern_racct.c

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    1 /*-
    2  * Copyright (c) 2010 The FreeBSD Foundation
    3  * All rights reserved.
    4  *
    5  * This software was developed by Edward Tomasz Napierala under sponsorship
    6  * from the FreeBSD Foundation.
    7  *
    8  * Redistribution and use in source and binary forms, with or without
    9  * modification, are permitted provided that the following conditions
   10  * are met:
   11  * 1. Redistributions of source code must retain the above copyright
   12  *    notice, this list of conditions and the following disclaimer.
   13  * 2. Redistributions in binary form must reproduce the above copyright
   14  *    notice, this list of conditions and the following disclaimer in the
   15  *    documentation and/or other materials provided with the distribution.
   16  *
   17  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   27  * SUCH DAMAGE.
   28  *
   29  * $FreeBSD: releng/9.2/sys/kern/kern_racct.c 249444 2013-04-13 21:04:06Z trasz $
   30  */
   31 
   32 #include <sys/cdefs.h>
   33 __FBSDID("$FreeBSD: releng/9.2/sys/kern/kern_racct.c 249444 2013-04-13 21:04:06Z trasz $");
   34 
   35 #include "opt_kdtrace.h"
   36 #include "opt_sched.h"
   37 
   38 #include <sys/param.h>
   39 #include <sys/systm.h>
   40 #include <sys/eventhandler.h>
   41 #include <sys/jail.h>
   42 #include <sys/kernel.h>
   43 #include <sys/kthread.h>
   44 #include <sys/lock.h>
   45 #include <sys/loginclass.h>
   46 #include <sys/malloc.h>
   47 #include <sys/mutex.h>
   48 #include <sys/proc.h>
   49 #include <sys/racct.h>
   50 #include <sys/resourcevar.h>
   51 #include <sys/sbuf.h>
   52 #include <sys/sched.h>
   53 #include <sys/sdt.h>
   54 #include <sys/smp.h>
   55 #include <sys/sx.h>
   56 #include <sys/sysctl.h>
   57 #include <sys/sysent.h>
   58 #include <sys/sysproto.h>
   59 #include <sys/umtx.h>
   60 #include <machine/smp.h>
   61 
   62 #ifdef RCTL
   63 #include <sys/rctl.h>
   64 #endif
   65 
   66 #ifdef RACCT
   67 
   68 FEATURE(racct, "Resource Accounting");
   69 
   70 /*
   71  * Do not block processes that have their %cpu usage <= pcpu_threshold.
   72  */
   73 static int pcpu_threshold = 1;
   74 
   75 SYSCTL_NODE(_kern, OID_AUTO, racct, CTLFLAG_RW, 0, "Resource Accounting");
   76 SYSCTL_UINT(_kern_racct, OID_AUTO, pcpu_threshold, CTLFLAG_RW, &pcpu_threshold,
   77     0, "Processes with higher %cpu usage than this value can be throttled.");
   78 
   79 /*
   80  * How many seconds it takes to use the scheduler %cpu calculations.  When a
   81  * process starts, we compute its %cpu usage by dividing its runtime by the
   82  * process wall clock time.  After RACCT_PCPU_SECS pass, we use the value
   83  * provided by the scheduler.
   84  */
   85 #define RACCT_PCPU_SECS         3
   86 
   87 static struct mtx racct_lock;
   88 MTX_SYSINIT(racct_lock, &racct_lock, "racct lock", MTX_DEF);
   89 
   90 static uma_zone_t racct_zone;
   91 
   92 static void racct_sub_racct(struct racct *dest, const struct racct *src);
   93 static void racct_sub_cred_locked(struct ucred *cred, int resource,
   94                 uint64_t amount);
   95 static void racct_add_cred_locked(struct ucred *cred, int resource,
   96                 uint64_t amount);
   97 
   98 SDT_PROVIDER_DEFINE(racct);
   99 SDT_PROBE_DEFINE3(racct, kernel, rusage, add, add, "struct proc *", "int",
  100     "uint64_t");
  101 SDT_PROBE_DEFINE3(racct, kernel, rusage, add_failure, add-failure,
  102     "struct proc *", "int", "uint64_t");
  103 SDT_PROBE_DEFINE3(racct, kernel, rusage, add_cred, add-cred, "struct ucred *",
  104     "int", "uint64_t");
  105 SDT_PROBE_DEFINE3(racct, kernel, rusage, add_force, add-force, "struct proc *",
  106     "int", "uint64_t");
  107 SDT_PROBE_DEFINE3(racct, kernel, rusage, set, set, "struct proc *", "int",
  108     "uint64_t");
  109 SDT_PROBE_DEFINE3(racct, kernel, rusage, set_failure, set-failure,
  110     "struct proc *", "int", "uint64_t");
  111 SDT_PROBE_DEFINE3(racct, kernel, rusage, sub, sub, "struct proc *", "int",
  112     "uint64_t");
  113 SDT_PROBE_DEFINE3(racct, kernel, rusage, sub_cred, sub-cred, "struct ucred *",
  114     "int", "uint64_t");
  115 SDT_PROBE_DEFINE1(racct, kernel, racct, create, create, "struct racct *");
  116 SDT_PROBE_DEFINE1(racct, kernel, racct, destroy, destroy, "struct racct *");
  117 SDT_PROBE_DEFINE2(racct, kernel, racct, join, join, "struct racct *",
  118     "struct racct *");
  119 SDT_PROBE_DEFINE2(racct, kernel, racct, join_failure, join-failure,
  120     "struct racct *", "struct racct *");
  121 SDT_PROBE_DEFINE2(racct, kernel, racct, leave, leave, "struct racct *",
  122     "struct racct *");
  123 
  124 int racct_types[] = {
  125         [RACCT_CPU] =
  126                 RACCT_IN_MILLIONS,
  127         [RACCT_DATA] =
  128                 RACCT_RECLAIMABLE | RACCT_INHERITABLE | RACCT_DENIABLE,
  129         [RACCT_STACK] =
  130                 RACCT_RECLAIMABLE | RACCT_INHERITABLE | RACCT_DENIABLE,
  131         [RACCT_CORE] =
  132                 RACCT_DENIABLE,
  133         [RACCT_RSS] =
  134                 RACCT_RECLAIMABLE,
  135         [RACCT_MEMLOCK] =
  136                 RACCT_RECLAIMABLE | RACCT_DENIABLE,
  137         [RACCT_NPROC] =
  138                 RACCT_RECLAIMABLE | RACCT_DENIABLE,
  139         [RACCT_NOFILE] =
  140                 RACCT_RECLAIMABLE | RACCT_INHERITABLE | RACCT_DENIABLE,
  141         [RACCT_VMEM] =
  142                 RACCT_RECLAIMABLE | RACCT_INHERITABLE | RACCT_DENIABLE,
  143         [RACCT_NPTS] =
  144                 RACCT_RECLAIMABLE | RACCT_DENIABLE | RACCT_SLOPPY,
  145         [RACCT_SWAP] =
  146                 RACCT_RECLAIMABLE | RACCT_DENIABLE | RACCT_SLOPPY,
  147         [RACCT_NTHR] =
  148                 RACCT_RECLAIMABLE | RACCT_DENIABLE,
  149         [RACCT_MSGQQUEUED] =
  150                 RACCT_RECLAIMABLE | RACCT_DENIABLE | RACCT_SLOPPY,
  151         [RACCT_MSGQSIZE] =
  152                 RACCT_RECLAIMABLE | RACCT_DENIABLE | RACCT_SLOPPY,
  153         [RACCT_NMSGQ] =
  154                 RACCT_RECLAIMABLE | RACCT_DENIABLE | RACCT_SLOPPY,
  155         [RACCT_NSEM] =
  156                 RACCT_RECLAIMABLE | RACCT_DENIABLE | RACCT_SLOPPY,
  157         [RACCT_NSEMOP] =
  158                 RACCT_RECLAIMABLE | RACCT_INHERITABLE | RACCT_DENIABLE,
  159         [RACCT_NSHM] =
  160                 RACCT_RECLAIMABLE | RACCT_DENIABLE | RACCT_SLOPPY,
  161         [RACCT_SHMSIZE] =
  162                 RACCT_RECLAIMABLE | RACCT_DENIABLE | RACCT_SLOPPY,
  163         [RACCT_WALLCLOCK] =
  164                 RACCT_IN_MILLIONS,
  165         [RACCT_PCTCPU] =
  166                 RACCT_DECAYING | RACCT_DENIABLE | RACCT_IN_MILLIONS };
  167 
  168 static const fixpt_t RACCT_DECAY_FACTOR = 0.3 * FSCALE;
  169 
  170 #ifdef SCHED_4BSD
  171 /*
  172  * Contains intermediate values for %cpu calculations to avoid using floating
  173  * point in the kernel.
  174  * ccpu_exp[k] = FSCALE * (ccpu/FSCALE)^k = FSCALE * exp(-k/20)
  175  * It is needed only for the 4BSD scheduler, because in ULE, the ccpu equals to
  176  * zero so the calculations are more straightforward.
  177  */
  178 fixpt_t ccpu_exp[] = {
  179         [0] = FSCALE * 1,
  180         [1] = FSCALE * 0.95122942450071400909,
  181         [2] = FSCALE * 0.90483741803595957316,
  182         [3] = FSCALE * 0.86070797642505780722,
  183         [4] = FSCALE * 0.81873075307798185866,
  184         [5] = FSCALE * 0.77880078307140486824,
  185         [6] = FSCALE * 0.74081822068171786606,
  186         [7] = FSCALE * 0.70468808971871343435,
  187         [8] = FSCALE * 0.67032004603563930074,
  188         [9] = FSCALE * 0.63762815162177329314,
  189         [10] = FSCALE * 0.60653065971263342360,
  190         [11] = FSCALE * 0.57694981038048669531,
  191         [12] = FSCALE * 0.54881163609402643262,
  192         [13] = FSCALE * 0.52204577676101604789,
  193         [14] = FSCALE * 0.49658530379140951470,
  194         [15] = FSCALE * 0.47236655274101470713,
  195         [16] = FSCALE * 0.44932896411722159143,
  196         [17] = FSCALE * 0.42741493194872666992,
  197         [18] = FSCALE * 0.40656965974059911188,
  198         [19] = FSCALE * 0.38674102345450120691,
  199         [20] = FSCALE * 0.36787944117144232159,
  200         [21] = FSCALE * 0.34993774911115535467,
  201         [22] = FSCALE * 0.33287108369807955328,
  202         [23] = FSCALE * 0.31663676937905321821,
  203         [24] = FSCALE * 0.30119421191220209664,
  204         [25] = FSCALE * 0.28650479686019010032,
  205         [26] = FSCALE * 0.27253179303401260312,
  206         [27] = FSCALE * 0.25924026064589150757,
  207         [28] = FSCALE * 0.24659696394160647693,
  208         [29] = FSCALE * 0.23457028809379765313,
  209         [30] = FSCALE * 0.22313016014842982893,
  210         [31] = FSCALE * 0.21224797382674305771,
  211         [32] = FSCALE * 0.20189651799465540848,
  212         [33] = FSCALE * 0.19204990862075411423,
  213         [34] = FSCALE * 0.18268352405273465022,
  214         [35] = FSCALE * 0.17377394345044512668,
  215         [36] = FSCALE * 0.16529888822158653829,
  216         [37] = FSCALE * 0.15723716631362761621,
  217         [38] = FSCALE * 0.14956861922263505264,
  218         [39] = FSCALE * 0.14227407158651357185,
  219         [40] = FSCALE * 0.13533528323661269189,
  220         [41] = FSCALE * 0.12873490358780421886,
  221         [42] = FSCALE * 0.12245642825298191021,
  222         [43] = FSCALE * 0.11648415777349695786,
  223         [44] = FSCALE * 0.11080315836233388333,
  224         [45] = FSCALE * 0.10539922456186433678,
  225         [46] = FSCALE * 0.10025884372280373372,
  226         [47] = FSCALE * 0.09536916221554961888,
  227         [48] = FSCALE * 0.09071795328941250337,
  228         [49] = FSCALE * 0.08629358649937051097,
  229         [50] = FSCALE * 0.08208499862389879516,
  230         [51] = FSCALE * 0.07808166600115315231,
  231         [52] = FSCALE * 0.07427357821433388042,
  232         [53] = FSCALE * 0.07065121306042958674,
  233         [54] = FSCALE * 0.06720551273974976512,
  234         [55] = FSCALE * 0.06392786120670757270,
  235         [56] = FSCALE * 0.06081006262521796499,
  236         [57] = FSCALE * 0.05784432087483846296,
  237         [58] = FSCALE * 0.05502322005640722902,
  238         [59] = FSCALE * 0.05233970594843239308,
  239         [60] = FSCALE * 0.04978706836786394297,
  240         [61] = FSCALE * 0.04735892439114092119,
  241         [62] = FSCALE * 0.04504920239355780606,
  242         [63] = FSCALE * 0.04285212686704017991,
  243         [64] = FSCALE * 0.04076220397836621516,
  244         [65] = FSCALE * 0.03877420783172200988,
  245         [66] = FSCALE * 0.03688316740124000544,
  246         [67] = FSCALE * 0.03508435410084502588,
  247         [68] = FSCALE * 0.03337326996032607948,
  248         [69] = FSCALE * 0.03174563637806794323,
  249         [70] = FSCALE * 0.03019738342231850073,
  250         [71] = FSCALE * 0.02872463965423942912,
  251         [72] = FSCALE * 0.02732372244729256080,
  252         [73] = FSCALE * 0.02599112877875534358,
  253         [74] = FSCALE * 0.02472352647033939120,
  254         [75] = FSCALE * 0.02351774585600910823,
  255         [76] = FSCALE * 0.02237077185616559577,
  256         [77] = FSCALE * 0.02127973643837716938,
  257         [78] = FSCALE * 0.02024191144580438847,
  258         [79] = FSCALE * 0.01925470177538692429,
  259         [80] = FSCALE * 0.01831563888873418029,
  260         [81] = FSCALE * 0.01742237463949351138,
  261         [82] = FSCALE * 0.01657267540176124754,
  262         [83] = FSCALE * 0.01576441648485449082,
  263         [84] = FSCALE * 0.01499557682047770621,
  264         [85] = FSCALE * 0.01426423390899925527,
  265         [86] = FSCALE * 0.01356855901220093175,
  266         [87] = FSCALE * 0.01290681258047986886,
  267         [88] = FSCALE * 0.01227733990306844117,
  268         [89] = FSCALE * 0.01167856697039544521,
  269         [90] = FSCALE * 0.01110899653824230649,
  270         [91] = FSCALE * 0.01056720438385265337,
  271         [92] = FSCALE * 0.01005183574463358164,
  272         [93] = FSCALE * 0.00956160193054350793,
  273         [94] = FSCALE * 0.00909527710169581709,
  274         [95] = FSCALE * 0.00865169520312063417,
  275         [96] = FSCALE * 0.00822974704902002884,
  276         [97] = FSCALE * 0.00782837754922577143,
  277         [98] = FSCALE * 0.00744658307092434051,
  278         [99] = FSCALE * 0.00708340892905212004,
  279         [100] = FSCALE * 0.00673794699908546709,
  280         [101] = FSCALE * 0.00640933344625638184,
  281         [102] = FSCALE * 0.00609674656551563610,
  282         [103] = FSCALE * 0.00579940472684214321,
  283         [104] = FSCALE * 0.00551656442076077241,
  284         [105] = FSCALE * 0.00524751839918138427,
  285         [106] = FSCALE * 0.00499159390691021621,
  286         [107] = FSCALE * 0.00474815099941147558,
  287         [108] = FSCALE * 0.00451658094261266798,
  288         [109] = FSCALE * 0.00429630469075234057,
  289         [110] = FSCALE * 0.00408677143846406699,
  290 };
  291 #endif
  292 
  293 #define CCPU_EXP_MAX    110
  294 
  295 /*
  296  * This function is analogical to the getpcpu() function in the ps(1) command.
  297  * They should both calculate in the same way so that the racct %cpu
  298  * calculations are consistent with the values showed by the ps(1) tool.
  299  * The calculations are more complex in the 4BSD scheduler because of the value
  300  * of the ccpu variable.  In ULE it is defined to be zero which saves us some
  301  * work.
  302  */
  303 static uint64_t
  304 racct_getpcpu(struct proc *p, u_int pcpu)
  305 {
  306         u_int swtime;
  307 #ifdef SCHED_4BSD
  308         fixpt_t pctcpu, pctcpu_next;
  309 #endif
  310 #ifdef SMP
  311         struct pcpu *pc;
  312         int found;
  313 #endif
  314         fixpt_t p_pctcpu;
  315         struct thread *td;
  316 
  317         /*
  318          * If the process is swapped out, we count its %cpu usage as zero.
  319          * This behaviour is consistent with the userland ps(1) tool.
  320          */
  321         if ((p->p_flag & P_INMEM) == 0)
  322                 return (0);
  323         swtime = (ticks - p->p_swtick) / hz;
  324 
  325         /*
  326          * For short-lived processes, the sched_pctcpu() returns small
  327          * values even for cpu intensive processes.  Therefore we use
  328          * our own estimate in this case.
  329          */
  330         if (swtime < RACCT_PCPU_SECS)
  331                 return (pcpu);
  332 
  333         p_pctcpu = 0;
  334         FOREACH_THREAD_IN_PROC(p, td) {
  335                 if (td == PCPU_GET(idlethread))
  336                         continue;
  337 #ifdef SMP
  338                 found = 0;
  339                 STAILQ_FOREACH(pc, &cpuhead, pc_allcpu) {
  340                         if (td == pc->pc_idlethread) {
  341                                 found = 1;
  342                                 break;
  343                         }
  344                 }
  345                 if (found)
  346                         continue;
  347 #endif
  348                 thread_lock(td);
  349 #ifdef SCHED_4BSD
  350                 pctcpu = sched_pctcpu(td);
  351                 /* Count also the yet unfinished second. */
  352                 pctcpu_next = (pctcpu * ccpu_exp[1]) >> FSHIFT;
  353                 pctcpu_next += sched_pctcpu_delta(td);
  354                 p_pctcpu += max(pctcpu, pctcpu_next);
  355 #else
  356                 /*
  357                  * In ULE the %cpu statistics are updated on every
  358                  * sched_pctcpu() call.  So special calculations to
  359                  * account for the latest (unfinished) second are
  360                  * not needed.
  361                  */
  362                 p_pctcpu += sched_pctcpu(td);
  363 #endif
  364                 thread_unlock(td);
  365         }
  366 
  367 #ifdef SCHED_4BSD
  368         if (swtime <= CCPU_EXP_MAX)
  369                 return ((100 * (uint64_t)p_pctcpu * 1000000) /
  370                     (FSCALE - ccpu_exp[swtime]));
  371 #endif
  372 
  373         return ((100 * (uint64_t)p_pctcpu * 1000000) / FSCALE);
  374 }
  375 
  376 static void
  377 racct_add_racct(struct racct *dest, const struct racct *src)
  378 {
  379         int i;
  380 
  381         mtx_assert(&racct_lock, MA_OWNED);
  382 
  383         /*
  384          * Update resource usage in dest.
  385          */
  386         for (i = 0; i <= RACCT_MAX; i++) {
  387                 KASSERT(dest->r_resources[i] >= 0,
  388                     ("%s: resource %d propagation meltdown: dest < 0",
  389                     __func__, i));
  390                 KASSERT(src->r_resources[i] >= 0,
  391                     ("%s: resource %d propagation meltdown: src < 0",
  392                     __func__, i));
  393                 dest->r_resources[i] += src->r_resources[i];
  394         }
  395 }
  396 
  397 static void
  398 racct_sub_racct(struct racct *dest, const struct racct *src)
  399 {
  400         int i;
  401 
  402         mtx_assert(&racct_lock, MA_OWNED);
  403 
  404         /*
  405          * Update resource usage in dest.
  406          */
  407         for (i = 0; i <= RACCT_MAX; i++) {
  408                 if (!RACCT_IS_SLOPPY(i) && !RACCT_IS_DECAYING(i)) {
  409                         KASSERT(dest->r_resources[i] >= 0,
  410                             ("%s: resource %d propagation meltdown: dest < 0",
  411                             __func__, i));
  412                         KASSERT(src->r_resources[i] >= 0,
  413                             ("%s: resource %d propagation meltdown: src < 0",
  414                             __func__, i));
  415                         KASSERT(src->r_resources[i] <= dest->r_resources[i],
  416                             ("%s: resource %d propagation meltdown: src > dest",
  417                             __func__, i));
  418                 }
  419                 if (RACCT_CAN_DROP(i)) {
  420                         dest->r_resources[i] -= src->r_resources[i];
  421                         if (dest->r_resources[i] < 0) {
  422                                 KASSERT(RACCT_IS_SLOPPY(i) ||
  423                                     RACCT_IS_DECAYING(i),
  424                                     ("%s: resource %d usage < 0", __func__, i));
  425                                 dest->r_resources[i] = 0;
  426                         }
  427                 }
  428         }
  429 }
  430 
  431 void
  432 racct_create(struct racct **racctp)
  433 {
  434 
  435         SDT_PROBE(racct, kernel, racct, create, racctp, 0, 0, 0, 0);
  436 
  437         KASSERT(*racctp == NULL, ("racct already allocated"));
  438 
  439         *racctp = uma_zalloc(racct_zone, M_WAITOK | M_ZERO);
  440 }
  441 
  442 static void
  443 racct_destroy_locked(struct racct **racctp)
  444 {
  445         int i;
  446         struct racct *racct;
  447 
  448         SDT_PROBE(racct, kernel, racct, destroy, racctp, 0, 0, 0, 0);
  449 
  450         mtx_assert(&racct_lock, MA_OWNED);
  451         KASSERT(racctp != NULL, ("NULL racctp"));
  452         KASSERT(*racctp != NULL, ("NULL racct"));
  453 
  454         racct = *racctp;
  455 
  456         for (i = 0; i <= RACCT_MAX; i++) {
  457                 if (RACCT_IS_SLOPPY(i))
  458                         continue;
  459                 if (!RACCT_IS_RECLAIMABLE(i))
  460                         continue;
  461                 KASSERT(racct->r_resources[i] == 0,
  462                     ("destroying non-empty racct: "
  463                     "%ju allocated for resource %d\n",
  464                     racct->r_resources[i], i));
  465         }
  466         uma_zfree(racct_zone, racct);
  467         *racctp = NULL;
  468 }
  469 
  470 void
  471 racct_destroy(struct racct **racct)
  472 {
  473 
  474         mtx_lock(&racct_lock);
  475         racct_destroy_locked(racct);
  476         mtx_unlock(&racct_lock);
  477 }
  478 
  479 /*
  480  * Increase consumption of 'resource' by 'amount' for 'racct'
  481  * and all its parents.  Differently from other cases, 'amount' here
  482  * may be less than zero.
  483  */
  484 static void
  485 racct_alloc_resource(struct racct *racct, int resource,
  486     uint64_t amount)
  487 {
  488 
  489         mtx_assert(&racct_lock, MA_OWNED);
  490         KASSERT(racct != NULL, ("NULL racct"));
  491 
  492         racct->r_resources[resource] += amount;
  493         if (racct->r_resources[resource] < 0) {
  494                 KASSERT(RACCT_IS_SLOPPY(resource) || RACCT_IS_DECAYING(resource),
  495                     ("%s: resource %d usage < 0", __func__, resource));
  496                 racct->r_resources[resource] = 0;
  497         }
  498         
  499         /*
  500          * There are some cases where the racct %cpu resource would grow
  501          * beyond 100%.
  502          * For example in racct_proc_exit() we add the process %cpu usage
  503          * to the ucred racct containers.  If too many processes terminated
  504          * in a short time span, the ucred %cpu resource could grow too much.
  505          * Also, the 4BSD scheduler sometimes returns for a thread more than
  506          * 100% cpu usage.  So we set a boundary here to 100%.
  507          */
  508         if ((resource == RACCT_PCTCPU) &&
  509             (racct->r_resources[RACCT_PCTCPU] > 100 * 1000000))
  510                 racct->r_resources[RACCT_PCTCPU] = 100 * 1000000;
  511 }
  512 
  513 static int
  514 racct_add_locked(struct proc *p, int resource, uint64_t amount)
  515 {
  516 #ifdef RCTL
  517         int error;
  518 #endif
  519 
  520         SDT_PROBE(racct, kernel, rusage, add, p, resource, amount, 0, 0);
  521 
  522         /*
  523          * We need proc lock to dereference p->p_ucred.
  524          */
  525         PROC_LOCK_ASSERT(p, MA_OWNED);
  526 
  527 #ifdef RCTL
  528         error = rctl_enforce(p, resource, amount);
  529         if (error && RACCT_IS_DENIABLE(resource)) {
  530                 SDT_PROBE(racct, kernel, rusage, add_failure, p, resource,
  531                     amount, 0, 0);
  532                 return (error);
  533         }
  534 #endif
  535         racct_alloc_resource(p->p_racct, resource, amount);
  536         racct_add_cred_locked(p->p_ucred, resource, amount);
  537 
  538         return (0);
  539 }
  540 
  541 /*
  542  * Increase allocation of 'resource' by 'amount' for process 'p'.
  543  * Return 0 if it's below limits, or errno, if it's not.
  544  */
  545 int
  546 racct_add(struct proc *p, int resource, uint64_t amount)
  547 {
  548         int error;
  549 
  550         mtx_lock(&racct_lock);
  551         error = racct_add_locked(p, resource, amount);
  552         mtx_unlock(&racct_lock);
  553         return (error);
  554 }
  555 
  556 static void
  557 racct_add_cred_locked(struct ucred *cred, int resource, uint64_t amount)
  558 {
  559         struct prison *pr;
  560 
  561         SDT_PROBE(racct, kernel, rusage, add_cred, cred, resource, amount,
  562             0, 0);
  563 
  564         racct_alloc_resource(cred->cr_ruidinfo->ui_racct, resource, amount);
  565         for (pr = cred->cr_prison; pr != NULL; pr = pr->pr_parent)
  566                 racct_alloc_resource(pr->pr_prison_racct->prr_racct, resource,
  567                     amount);
  568         racct_alloc_resource(cred->cr_loginclass->lc_racct, resource, amount);
  569 }
  570 
  571 /*
  572  * Increase allocation of 'resource' by 'amount' for credential 'cred'.
  573  * Doesn't check for limits and never fails.
  574  *
  575  * XXX: Shouldn't this ever return an error?
  576  */
  577 void
  578 racct_add_cred(struct ucred *cred, int resource, uint64_t amount)
  579 {
  580 
  581         mtx_lock(&racct_lock);
  582         racct_add_cred_locked(cred, resource, amount);
  583         mtx_unlock(&racct_lock);
  584 }
  585 
  586 /*
  587  * Increase allocation of 'resource' by 'amount' for process 'p'.
  588  * Doesn't check for limits and never fails.
  589  */
  590 void
  591 racct_add_force(struct proc *p, int resource, uint64_t amount)
  592 {
  593 
  594         SDT_PROBE(racct, kernel, rusage, add_force, p, resource, amount, 0, 0);
  595 
  596         /*
  597          * We need proc lock to dereference p->p_ucred.
  598          */
  599         PROC_LOCK_ASSERT(p, MA_OWNED);
  600 
  601         mtx_lock(&racct_lock);
  602         racct_alloc_resource(p->p_racct, resource, amount);
  603         mtx_unlock(&racct_lock);
  604         racct_add_cred(p->p_ucred, resource, amount);
  605 }
  606 
  607 static int
  608 racct_set_locked(struct proc *p, int resource, uint64_t amount)
  609 {
  610         int64_t old_amount, decayed_amount;
  611         int64_t diff_proc, diff_cred;
  612 #ifdef RCTL
  613         int error;
  614 #endif
  615 
  616         SDT_PROBE(racct, kernel, rusage, set, p, resource, amount, 0, 0);
  617 
  618         /*
  619          * We need proc lock to dereference p->p_ucred.
  620          */
  621         PROC_LOCK_ASSERT(p, MA_OWNED);
  622 
  623         old_amount = p->p_racct->r_resources[resource];
  624         /*
  625          * The diffs may be negative.
  626          */
  627         diff_proc = amount - old_amount;
  628         if (RACCT_IS_DECAYING(resource)) {
  629                 /*
  630                  * Resources in per-credential racct containers may decay.
  631                  * If this is the case, we need to calculate the difference
  632                  * between the new amount and the proportional value of the
  633                  * old amount that has decayed in the ucred racct containers.
  634                  */
  635                 decayed_amount = old_amount * RACCT_DECAY_FACTOR / FSCALE;
  636                 diff_cred = amount - decayed_amount;
  637         } else
  638                 diff_cred = diff_proc;
  639 #ifdef notyet
  640         KASSERT(diff_proc >= 0 || RACCT_CAN_DROP(resource),
  641             ("%s: usage of non-droppable resource %d dropping", __func__,
  642              resource));
  643 #endif
  644 #ifdef RCTL
  645         if (diff_proc > 0) {
  646                 error = rctl_enforce(p, resource, diff_proc);
  647                 if (error && RACCT_IS_DENIABLE(resource)) {
  648                         SDT_PROBE(racct, kernel, rusage, set_failure, p,
  649                             resource, amount, 0, 0);
  650                         return (error);
  651                 }
  652         }
  653 #endif
  654         racct_alloc_resource(p->p_racct, resource, diff_proc);
  655         if (diff_cred > 0)
  656                 racct_add_cred_locked(p->p_ucred, resource, diff_cred);
  657         else if (diff_cred < 0)
  658                 racct_sub_cred_locked(p->p_ucred, resource, -diff_cred);
  659 
  660         return (0);
  661 }
  662 
  663 /*
  664  * Set allocation of 'resource' to 'amount' for process 'p'.
  665  * Return 0 if it's below limits, or errno, if it's not.
  666  *
  667  * Note that decreasing the allocation always returns 0,
  668  * even if it's above the limit.
  669  */
  670 int
  671 racct_set(struct proc *p, int resource, uint64_t amount)
  672 {
  673         int error;
  674 
  675         mtx_lock(&racct_lock);
  676         error = racct_set_locked(p, resource, amount);
  677         mtx_unlock(&racct_lock);
  678         return (error);
  679 }
  680 
  681 static void
  682 racct_set_force_locked(struct proc *p, int resource, uint64_t amount)
  683 {
  684         int64_t old_amount, decayed_amount;
  685         int64_t diff_proc, diff_cred;
  686 
  687         SDT_PROBE(racct, kernel, rusage, set, p, resource, amount, 0, 0);
  688 
  689         /*
  690          * We need proc lock to dereference p->p_ucred.
  691          */
  692         PROC_LOCK_ASSERT(p, MA_OWNED);
  693 
  694         old_amount = p->p_racct->r_resources[resource];
  695         /*
  696          * The diffs may be negative.
  697          */
  698         diff_proc = amount - old_amount;
  699         if (RACCT_IS_DECAYING(resource)) {
  700                 /*
  701                  * Resources in per-credential racct containers may decay.
  702                  * If this is the case, we need to calculate the difference
  703                  * between the new amount and the proportional value of the
  704                  * old amount that has decayed in the ucred racct containers.
  705                  */
  706                 decayed_amount = old_amount * RACCT_DECAY_FACTOR / FSCALE;
  707                 diff_cred = amount - decayed_amount;
  708         } else
  709                 diff_cred = diff_proc;
  710 
  711         racct_alloc_resource(p->p_racct, resource, diff_proc);
  712         if (diff_cred > 0)
  713                 racct_add_cred_locked(p->p_ucred, resource, diff_cred);
  714         else if (diff_cred < 0)
  715                 racct_sub_cred_locked(p->p_ucred, resource, -diff_cred);
  716 }
  717 
  718 void
  719 racct_set_force(struct proc *p, int resource, uint64_t amount)
  720 {
  721         mtx_lock(&racct_lock);
  722         racct_set_force_locked(p, resource, amount);
  723         mtx_unlock(&racct_lock);
  724 }
  725 
  726 /*
  727  * Returns amount of 'resource' the process 'p' can keep allocated.
  728  * Allocating more than that would be denied, unless the resource
  729  * is marked undeniable.  Amount of already allocated resource does
  730  * not matter.
  731  */
  732 uint64_t
  733 racct_get_limit(struct proc *p, int resource)
  734 {
  735 
  736 #ifdef RCTL
  737         return (rctl_get_limit(p, resource));
  738 #else
  739         return (UINT64_MAX);
  740 #endif
  741 }
  742 
  743 /*
  744  * Returns amount of 'resource' the process 'p' can keep allocated.
  745  * Allocating more than that would be denied, unless the resource
  746  * is marked undeniable.  Amount of already allocated resource does
  747  * matter.
  748  */
  749 uint64_t
  750 racct_get_available(struct proc *p, int resource)
  751 {
  752 
  753 #ifdef RCTL
  754         return (rctl_get_available(p, resource));
  755 #else
  756         return (UINT64_MAX);
  757 #endif
  758 }
  759 
  760 /*
  761  * Returns amount of the %cpu resource that process 'p' can add to its %cpu
  762  * utilization.  Adding more than that would lead to the process being
  763  * throttled.
  764  */
  765 static int64_t
  766 racct_pcpu_available(struct proc *p)
  767 {
  768 
  769 #ifdef RCTL
  770         return (rctl_pcpu_available(p));
  771 #else
  772         return (INT64_MAX);
  773 #endif
  774 }
  775 
  776 /*
  777  * Decrease allocation of 'resource' by 'amount' for process 'p'.
  778  */
  779 void
  780 racct_sub(struct proc *p, int resource, uint64_t amount)
  781 {
  782 
  783         SDT_PROBE(racct, kernel, rusage, sub, p, resource, amount, 0, 0);
  784 
  785         /*
  786          * We need proc lock to dereference p->p_ucred.
  787          */
  788         PROC_LOCK_ASSERT(p, MA_OWNED);
  789         KASSERT(RACCT_CAN_DROP(resource),
  790             ("%s: called for non-droppable resource %d", __func__, resource));
  791 
  792         mtx_lock(&racct_lock);
  793         KASSERT(amount <= p->p_racct->r_resources[resource],
  794             ("%s: freeing %ju of resource %d, which is more "
  795              "than allocated %jd for %s (pid %d)", __func__, amount, resource,
  796             (intmax_t)p->p_racct->r_resources[resource], p->p_comm, p->p_pid));
  797 
  798         racct_alloc_resource(p->p_racct, resource, -amount);
  799         racct_sub_cred_locked(p->p_ucred, resource, amount);
  800         mtx_unlock(&racct_lock);
  801 }
  802 
  803 static void
  804 racct_sub_cred_locked(struct ucred *cred, int resource, uint64_t amount)
  805 {
  806         struct prison *pr;
  807 
  808         SDT_PROBE(racct, kernel, rusage, sub_cred, cred, resource, amount,
  809             0, 0);
  810 
  811 #ifdef notyet
  812         KASSERT(RACCT_CAN_DROP(resource),
  813             ("%s: called for resource %d which can not drop", __func__,
  814              resource));
  815 #endif
  816 
  817         racct_alloc_resource(cred->cr_ruidinfo->ui_racct, resource, -amount);
  818         for (pr = cred->cr_prison; pr != NULL; pr = pr->pr_parent)
  819                 racct_alloc_resource(pr->pr_prison_racct->prr_racct, resource,
  820                     -amount);
  821         racct_alloc_resource(cred->cr_loginclass->lc_racct, resource, -amount);
  822 }
  823 
  824 /*
  825  * Decrease allocation of 'resource' by 'amount' for credential 'cred'.
  826  */
  827 void
  828 racct_sub_cred(struct ucred *cred, int resource, uint64_t amount)
  829 {
  830 
  831         mtx_lock(&racct_lock);
  832         racct_sub_cred_locked(cred, resource, amount);
  833         mtx_unlock(&racct_lock);
  834 }
  835 
  836 /*
  837  * Inherit resource usage information from the parent process.
  838  */
  839 int
  840 racct_proc_fork(struct proc *parent, struct proc *child)
  841 {
  842         int i, error = 0;
  843 
  844         /*
  845          * Create racct for the child process.
  846          */
  847         racct_create(&child->p_racct);
  848 
  849         PROC_LOCK(parent);
  850         PROC_LOCK(child);
  851         mtx_lock(&racct_lock);
  852 
  853 #ifdef RCTL
  854         error = rctl_proc_fork(parent, child);
  855         if (error != 0)
  856                 goto out;
  857 #endif
  858 
  859         /* Init process cpu time. */
  860         child->p_prev_runtime = 0;
  861         child->p_throttled = 0;
  862 
  863         /*
  864          * Inherit resource usage.
  865          */
  866         for (i = 0; i <= RACCT_MAX; i++) {
  867                 if (parent->p_racct->r_resources[i] == 0 ||
  868                     !RACCT_IS_INHERITABLE(i))
  869                         continue;
  870 
  871                 error = racct_set_locked(child, i,
  872                     parent->p_racct->r_resources[i]);
  873                 if (error != 0)
  874                         goto out;
  875         }
  876 
  877         error = racct_add_locked(child, RACCT_NPROC, 1);
  878         error += racct_add_locked(child, RACCT_NTHR, 1);
  879 
  880 out:
  881         mtx_unlock(&racct_lock);
  882         PROC_UNLOCK(child);
  883         PROC_UNLOCK(parent);
  884 
  885         if (error != 0)
  886                 racct_proc_exit(child);
  887 
  888         return (error);
  889 }
  890 
  891 /*
  892  * Called at the end of fork1(), to handle rules that require the process
  893  * to be fully initialized.
  894  */
  895 void
  896 racct_proc_fork_done(struct proc *child)
  897 {
  898 
  899 #ifdef RCTL
  900         PROC_LOCK(child);
  901         mtx_lock(&racct_lock);
  902         rctl_enforce(child, RACCT_NPROC, 0);
  903         rctl_enforce(child, RACCT_NTHR, 0);
  904         mtx_unlock(&racct_lock);
  905         PROC_UNLOCK(child);
  906 #endif
  907 }
  908 
  909 void
  910 racct_proc_exit(struct proc *p)
  911 {
  912         int i;
  913         uint64_t runtime;
  914         struct timeval wallclock;
  915         uint64_t pct_estimate, pct;
  916 
  917         PROC_LOCK(p);
  918         /*
  919          * We don't need to calculate rux, proc_reap() has already done this.
  920          */
  921         runtime = cputick2usec(p->p_rux.rux_runtime);
  922 #ifdef notyet
  923         KASSERT(runtime >= p->p_prev_runtime, ("runtime < p_prev_runtime"));
  924 #else
  925         if (runtime < p->p_prev_runtime)
  926                 runtime = p->p_prev_runtime;
  927 #endif
  928         microuptime(&wallclock);
  929         timevalsub(&wallclock, &p->p_stats->p_start);
  930         if (wallclock.tv_sec > 0 || wallclock.tv_usec > 0) {
  931                 pct_estimate = (1000000 * runtime * 100) /
  932                     ((uint64_t)wallclock.tv_sec * 1000000 +
  933                     wallclock.tv_usec);
  934         } else
  935                 pct_estimate = 0;
  936         pct = racct_getpcpu(p, pct_estimate);
  937 
  938         mtx_lock(&racct_lock);
  939         racct_set_locked(p, RACCT_CPU, runtime);
  940         racct_add_cred_locked(p->p_ucred, RACCT_PCTCPU, pct);
  941 
  942         for (i = 0; i <= RACCT_MAX; i++) {
  943                 if (p->p_racct->r_resources[i] == 0)
  944                         continue;
  945                 if (!RACCT_IS_RECLAIMABLE(i))
  946                         continue;
  947                 racct_set_locked(p, i, 0);
  948         }
  949 
  950         mtx_unlock(&racct_lock);
  951         PROC_UNLOCK(p);
  952 
  953 #ifdef RCTL
  954         rctl_racct_release(p->p_racct);
  955 #endif
  956         racct_destroy(&p->p_racct);
  957 }
  958 
  959 /*
  960  * Called after credentials change, to move resource utilisation
  961  * between raccts.
  962  */
  963 void
  964 racct_proc_ucred_changed(struct proc *p, struct ucred *oldcred,
  965     struct ucred *newcred)
  966 {
  967         struct uidinfo *olduip, *newuip;
  968         struct loginclass *oldlc, *newlc;
  969         struct prison *oldpr, *newpr, *pr;
  970 
  971         PROC_LOCK_ASSERT(p, MA_NOTOWNED);
  972 
  973         newuip = newcred->cr_ruidinfo;
  974         olduip = oldcred->cr_ruidinfo;
  975         newlc = newcred->cr_loginclass;
  976         oldlc = oldcred->cr_loginclass;
  977         newpr = newcred->cr_prison;
  978         oldpr = oldcred->cr_prison;
  979 
  980         mtx_lock(&racct_lock);
  981         if (newuip != olduip) {
  982                 racct_sub_racct(olduip->ui_racct, p->p_racct);
  983                 racct_add_racct(newuip->ui_racct, p->p_racct);
  984         }
  985         if (newlc != oldlc) {
  986                 racct_sub_racct(oldlc->lc_racct, p->p_racct);
  987                 racct_add_racct(newlc->lc_racct, p->p_racct);
  988         }
  989         if (newpr != oldpr) {
  990                 for (pr = oldpr; pr != NULL; pr = pr->pr_parent)
  991                         racct_sub_racct(pr->pr_prison_racct->prr_racct,
  992                             p->p_racct);
  993                 for (pr = newpr; pr != NULL; pr = pr->pr_parent)
  994                         racct_add_racct(pr->pr_prison_racct->prr_racct,
  995                             p->p_racct);
  996         }
  997         mtx_unlock(&racct_lock);
  998 
  999 #ifdef RCTL
 1000         rctl_proc_ucred_changed(p, newcred);
 1001 #endif
 1002 }
 1003 
 1004 void
 1005 racct_move(struct racct *dest, struct racct *src)
 1006 {
 1007 
 1008         mtx_lock(&racct_lock);
 1009 
 1010         racct_add_racct(dest, src);
 1011         racct_sub_racct(src, src);
 1012 
 1013         mtx_unlock(&racct_lock);
 1014 }
 1015 
 1016 static void
 1017 racct_proc_throttle(struct proc *p)
 1018 {
 1019         struct thread *td;
 1020 #ifdef SMP
 1021         int cpuid;
 1022 #endif
 1023 
 1024         PROC_LOCK_ASSERT(p, MA_OWNED);
 1025 
 1026         /*
 1027          * Do not block kernel processes.  Also do not block processes with
 1028          * low %cpu utilization to improve interactivity.
 1029          */
 1030         if (((p->p_flag & (P_SYSTEM | P_KTHREAD)) != 0) ||
 1031             (p->p_racct->r_resources[RACCT_PCTCPU] <= pcpu_threshold))
 1032                 return;
 1033         p->p_throttled = 1;
 1034 
 1035         FOREACH_THREAD_IN_PROC(p, td) {
 1036                 thread_lock(td);
 1037                 switch (td->td_state) {
 1038                 case TDS_RUNQ:
 1039                         /*
 1040                          * If the thread is on the scheduler run-queue, we can
 1041                          * not just remove it from there.  So we set the flag
 1042                          * TDF_NEEDRESCHED for the thread, so that once it is
 1043                          * running, it is taken off the cpu as soon as possible.
 1044                          */
 1045                         td->td_flags |= TDF_NEEDRESCHED;
 1046                         break;
 1047                 case TDS_RUNNING:
 1048                         /*
 1049                          * If the thread is running, we request a context
 1050                          * switch for it by setting the TDF_NEEDRESCHED flag.
 1051                          */
 1052                         td->td_flags |= TDF_NEEDRESCHED;
 1053 #ifdef SMP
 1054                         cpuid = td->td_oncpu;
 1055                         if ((cpuid != NOCPU) && (td != curthread))
 1056                                 ipi_cpu(cpuid, IPI_AST);
 1057 #endif
 1058                         break;
 1059                 default:
 1060                         break;
 1061                 }
 1062                 thread_unlock(td);
 1063         }
 1064 }
 1065 
 1066 static void
 1067 racct_proc_wakeup(struct proc *p)
 1068 {
 1069         PROC_LOCK_ASSERT(p, MA_OWNED);
 1070 
 1071         if (p->p_throttled) {
 1072                 p->p_throttled = 0;
 1073                 wakeup(p->p_racct);
 1074         }
 1075 }
 1076 
 1077 static void
 1078 racct_decay_resource(struct racct *racct, void * res, void* dummy)
 1079 {
 1080         int resource;
 1081         int64_t r_old, r_new;
 1082 
 1083         resource = *(int *)res;
 1084         r_old = racct->r_resources[resource];
 1085 
 1086         /* If there is nothing to decay, just exit. */
 1087         if (r_old <= 0)
 1088                 return;
 1089 
 1090         mtx_lock(&racct_lock);
 1091         r_new = r_old * RACCT_DECAY_FACTOR / FSCALE;
 1092         racct->r_resources[resource] = r_new;
 1093         mtx_unlock(&racct_lock);
 1094 }
 1095 
 1096 static void
 1097 racct_decay(int resource)
 1098 {
 1099         ui_racct_foreach(racct_decay_resource, &resource, NULL);
 1100         loginclass_racct_foreach(racct_decay_resource, &resource, NULL);
 1101         prison_racct_foreach(racct_decay_resource, &resource, NULL);
 1102 }
 1103 
 1104 static void
 1105 racctd(void)
 1106 {
 1107         struct thread *td;
 1108         struct proc *p;
 1109         struct timeval wallclock;
 1110         uint64_t runtime;
 1111         uint64_t pct, pct_estimate;
 1112 
 1113         for (;;) {
 1114                 racct_decay(RACCT_PCTCPU);
 1115 
 1116                 sx_slock(&allproc_lock);
 1117 
 1118                 LIST_FOREACH(p, &zombproc, p_list) {
 1119                         PROC_LOCK(p);
 1120                         racct_set(p, RACCT_PCTCPU, 0);
 1121                         PROC_UNLOCK(p);
 1122                 }
 1123 
 1124                 FOREACH_PROC_IN_SYSTEM(p) {
 1125                         PROC_LOCK(p);
 1126                         if (p->p_state != PRS_NORMAL) {
 1127                                 PROC_UNLOCK(p);
 1128                                 continue;
 1129                         }
 1130 
 1131                         microuptime(&wallclock);
 1132                         timevalsub(&wallclock, &p->p_stats->p_start);
 1133                         PROC_SLOCK(p);
 1134                         FOREACH_THREAD_IN_PROC(p, td)
 1135                                 ruxagg(p, td);
 1136                         runtime = cputick2usec(p->p_rux.rux_runtime);
 1137                         PROC_SUNLOCK(p);
 1138 #ifdef notyet
 1139                         KASSERT(runtime >= p->p_prev_runtime,
 1140                             ("runtime < p_prev_runtime"));
 1141 #else
 1142                         if (runtime < p->p_prev_runtime)
 1143                                 runtime = p->p_prev_runtime;
 1144 #endif
 1145                         p->p_prev_runtime = runtime;
 1146                         if (wallclock.tv_sec > 0 || wallclock.tv_usec > 0) {
 1147                                 pct_estimate = (1000000 * runtime * 100) /
 1148                                     ((uint64_t)wallclock.tv_sec * 1000000 +
 1149                                     wallclock.tv_usec);
 1150                         } else
 1151                                 pct_estimate = 0;
 1152                         pct = racct_getpcpu(p, pct_estimate);
 1153                         mtx_lock(&racct_lock);
 1154                         racct_set_force_locked(p, RACCT_PCTCPU, pct);
 1155                         racct_set_locked(p, RACCT_CPU, runtime);
 1156                         racct_set_locked(p, RACCT_WALLCLOCK,
 1157                             (uint64_t)wallclock.tv_sec * 1000000 +
 1158                             wallclock.tv_usec);
 1159                         mtx_unlock(&racct_lock);
 1160                         PROC_UNLOCK(p);
 1161                 }
 1162 
 1163                 /*
 1164                  * To ensure that processes are throttled in a fair way, we need
 1165                  * to iterate over all processes again and check the limits
 1166                  * for %cpu resource only after ucred racct containers have been
 1167                  * properly filled.
 1168                  */
 1169                 FOREACH_PROC_IN_SYSTEM(p) {
 1170                         PROC_LOCK(p);
 1171                         if (p->p_state != PRS_NORMAL) {
 1172                                 PROC_UNLOCK(p);
 1173                                 continue;
 1174                         }
 1175 
 1176                         if (racct_pcpu_available(p) <= 0)
 1177                                 racct_proc_throttle(p);
 1178                         else if (p->p_throttled)
 1179                                 racct_proc_wakeup(p);
 1180                         PROC_UNLOCK(p);
 1181                 }
 1182                 sx_sunlock(&allproc_lock);
 1183                 pause("-", hz);
 1184         }
 1185 }
 1186 
 1187 static struct kproc_desc racctd_kp = {
 1188         "racctd",
 1189         racctd,
 1190         NULL
 1191 };
 1192 SYSINIT(racctd, SI_SUB_RACCTD, SI_ORDER_FIRST, kproc_start, &racctd_kp);
 1193 
 1194 static void
 1195 racct_init(void)
 1196 {
 1197 
 1198         racct_zone = uma_zcreate("racct", sizeof(struct racct),
 1199             NULL, NULL, NULL, NULL, UMA_ALIGN_PTR, UMA_ZONE_NOFREE);
 1200         /*
 1201          * XXX: Move this somewhere.
 1202          */
 1203         prison0.pr_prison_racct = prison_racct_find("");
 1204 }
 1205 SYSINIT(racct, SI_SUB_RACCT, SI_ORDER_FIRST, racct_init, NULL);
 1206 
 1207 #else /* !RACCT */
 1208 
 1209 int
 1210 racct_add(struct proc *p, int resource, uint64_t amount)
 1211 {
 1212 
 1213         return (0);
 1214 }
 1215 
 1216 void
 1217 racct_add_cred(struct ucred *cred, int resource, uint64_t amount)
 1218 {
 1219 }
 1220 
 1221 void
 1222 racct_add_force(struct proc *p, int resource, uint64_t amount)
 1223 {
 1224 
 1225         return;
 1226 }
 1227 
 1228 int
 1229 racct_set(struct proc *p, int resource, uint64_t amount)
 1230 {
 1231 
 1232         return (0);
 1233 }
 1234 
 1235 void
 1236 racct_set_force(struct proc *p, int resource, uint64_t amount)
 1237 {
 1238 }
 1239 
 1240 void
 1241 racct_sub(struct proc *p, int resource, uint64_t amount)
 1242 {
 1243 }
 1244 
 1245 void
 1246 racct_sub_cred(struct ucred *cred, int resource, uint64_t amount)
 1247 {
 1248 }
 1249 
 1250 uint64_t
 1251 racct_get_limit(struct proc *p, int resource)
 1252 {
 1253 
 1254         return (UINT64_MAX);
 1255 }
 1256 
 1257 uint64_t
 1258 racct_get_available(struct proc *p, int resource)
 1259 {
 1260 
 1261         return (UINT64_MAX);
 1262 }
 1263 
 1264 void
 1265 racct_create(struct racct **racctp)
 1266 {
 1267 }
 1268 
 1269 void
 1270 racct_destroy(struct racct **racctp)
 1271 {
 1272 }
 1273 
 1274 int
 1275 racct_proc_fork(struct proc *parent, struct proc *child)
 1276 {
 1277 
 1278         return (0);
 1279 }
 1280 
 1281 void
 1282 racct_proc_fork_done(struct proc *child)
 1283 {
 1284 }
 1285 
 1286 void
 1287 racct_proc_exit(struct proc *p)
 1288 {
 1289 }
 1290 
 1291 #endif /* !RACCT */
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FreeBSD/Linux Kernel Cross Reference sys/kern/kern_racct.c

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