kern_racct.c

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    1 /*-
    2  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
    3  *
    4  * Copyright (c) 2010 The FreeBSD Foundation
    5  *
    6  * This software was developed by Edward Tomasz Napierala under sponsorship
    7  * from the FreeBSD Foundation.
    8  *
    9  * Redistribution and use in source and binary forms, with or without
   10  * modification, are permitted provided that the following conditions
   11  * are met:
   12  * 1. Redistributions of source code must retain the above copyright
   13  *    notice, this list of conditions and the following disclaimer.
   14  * 2. Redistributions in binary form must reproduce the above copyright
   15  *    notice, this list of conditions and the following disclaimer in the
   16  *    documentation and/or other materials provided with the distribution.
   17  *
   18  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   19  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   20  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   21  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   22  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   23  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   24  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   25  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   26  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   27  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   28  * SUCH DAMAGE.
   29  *
   30  * $FreeBSD$
   31  */
   32 
   33 #include <sys/cdefs.h>
   34 __FBSDID("$FreeBSD$");
   35 
   36 #include "opt_sched.h"
   37 
   38 #include <sys/param.h>
   39 #include <sys/buf.h>
   40 #include <sys/systm.h>
   41 #include <sys/eventhandler.h>
   42 #include <sys/jail.h>
   43 #include <sys/kernel.h>
   44 #include <sys/kthread.h>
   45 #include <sys/lock.h>
   46 #include <sys/loginclass.h>
   47 #include <sys/malloc.h>
   48 #include <sys/mutex.h>
   49 #include <sys/proc.h>
   50 #include <sys/racct.h>
   51 #include <sys/resourcevar.h>
   52 #include <sys/sbuf.h>
   53 #include <sys/sched.h>
   54 #include <sys/sdt.h>
   55 #include <sys/smp.h>
   56 #include <sys/sx.h>
   57 #include <sys/sysctl.h>
   58 #include <sys/sysent.h>
   59 #include <sys/sysproto.h>
   60 #include <sys/umtx.h>
   61 #include <machine/smp.h>
   62 
   63 #ifdef RCTL
   64 #include <sys/rctl.h>
   65 #endif
   66 
   67 #ifdef RACCT
   68 
   69 FEATURE(racct, "Resource Accounting");
   70 
   71 /*
   72  * Do not block processes that have their %cpu usage <= pcpu_threshold.
   73  */
   74 static int pcpu_threshold = 1;
   75 #ifdef RACCT_DEFAULT_TO_DISABLED
   76 bool __read_frequently racct_enable = false;
   77 #else
   78 bool __read_frequently racct_enable = true;
   79 #endif
   80 
   81 SYSCTL_NODE(_kern, OID_AUTO, racct, CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
   82     "Resource Accounting");
   83 SYSCTL_BOOL(_kern_racct, OID_AUTO, enable, CTLFLAG_RDTUN, &racct_enable,
   84     0, "Enable RACCT/RCTL");
   85 SYSCTL_UINT(_kern_racct, OID_AUTO, pcpu_threshold, CTLFLAG_RW, &pcpu_threshold,
   86     0, "Processes with higher %cpu usage than this value can be throttled.");
   87 
   88 /*
   89  * How many seconds it takes to use the scheduler %cpu calculations.  When a
   90  * process starts, we compute its %cpu usage by dividing its runtime by the
   91  * process wall clock time.  After RACCT_PCPU_SECS pass, we use the value
   92  * provided by the scheduler.
   93  */
   94 #define RACCT_PCPU_SECS         3
   95 
   96 struct mtx racct_lock;
   97 MTX_SYSINIT(racct_lock, &racct_lock, "racct lock", MTX_DEF);
   98 
   99 static uma_zone_t racct_zone;
  100 
  101 static void racct_sub_racct(struct racct *dest, const struct racct *src);
  102 static void racct_sub_cred_locked(struct ucred *cred, int resource,
  103                 uint64_t amount);
  104 static void racct_add_cred_locked(struct ucred *cred, int resource,
  105                 uint64_t amount);
  106 
  107 SDT_PROVIDER_DEFINE(racct);
  108 SDT_PROBE_DEFINE3(racct, , rusage, add,
  109     "struct proc *", "int", "uint64_t");
  110 SDT_PROBE_DEFINE3(racct, , rusage, add__failure,
  111     "struct proc *", "int", "uint64_t");
  112 SDT_PROBE_DEFINE3(racct, , rusage, add__buf,
  113     "struct proc *", "const struct buf *", "int");
  114 SDT_PROBE_DEFINE3(racct, , rusage, add__cred,
  115     "struct ucred *", "int", "uint64_t");
  116 SDT_PROBE_DEFINE3(racct, , rusage, add__force,
  117     "struct proc *", "int", "uint64_t");
  118 SDT_PROBE_DEFINE3(racct, , rusage, set,
  119     "struct proc *", "int", "uint64_t");
  120 SDT_PROBE_DEFINE3(racct, , rusage, set__failure,
  121     "struct proc *", "int", "uint64_t");
  122 SDT_PROBE_DEFINE3(racct, , rusage, set__force,
  123     "struct proc *", "int", "uint64_t");
  124 SDT_PROBE_DEFINE3(racct, , rusage, sub,
  125     "struct proc *", "int", "uint64_t");
  126 SDT_PROBE_DEFINE3(racct, , rusage, sub__cred,
  127     "struct ucred *", "int", "uint64_t");
  128 SDT_PROBE_DEFINE1(racct, , racct, create,
  129     "struct racct *");
  130 SDT_PROBE_DEFINE1(racct, , racct, destroy,
  131     "struct racct *");
  132 SDT_PROBE_DEFINE2(racct, , racct, join,
  133     "struct racct *", "struct racct *");
  134 SDT_PROBE_DEFINE2(racct, , racct, join__failure,
  135     "struct racct *", "struct racct *");
  136 SDT_PROBE_DEFINE2(racct, , racct, leave,
  137     "struct racct *", "struct racct *");
  138 
  139 int racct_types[] = {
  140         [RACCT_CPU] =
  141                 RACCT_IN_MILLIONS,
  142         [RACCT_DATA] =
  143                 RACCT_RECLAIMABLE | RACCT_INHERITABLE | RACCT_DENIABLE,
  144         [RACCT_STACK] =
  145                 RACCT_RECLAIMABLE | RACCT_INHERITABLE | RACCT_DENIABLE,
  146         [RACCT_CORE] =
  147                 RACCT_DENIABLE,
  148         [RACCT_RSS] =
  149                 RACCT_RECLAIMABLE,
  150         [RACCT_MEMLOCK] =
  151                 RACCT_RECLAIMABLE | RACCT_DENIABLE,
  152         [RACCT_NPROC] =
  153                 RACCT_RECLAIMABLE | RACCT_DENIABLE,
  154         [RACCT_NOFILE] =
  155                 RACCT_RECLAIMABLE | RACCT_INHERITABLE | RACCT_DENIABLE,
  156         [RACCT_VMEM] =
  157                 RACCT_RECLAIMABLE | RACCT_INHERITABLE | RACCT_DENIABLE,
  158         [RACCT_NPTS] =
  159                 RACCT_RECLAIMABLE | RACCT_DENIABLE | RACCT_SLOPPY,
  160         [RACCT_SWAP] =
  161                 RACCT_RECLAIMABLE | RACCT_DENIABLE | RACCT_SLOPPY,
  162         [RACCT_NTHR] =
  163                 RACCT_RECLAIMABLE | RACCT_DENIABLE,
  164         [RACCT_MSGQQUEUED] =
  165                 RACCT_RECLAIMABLE | RACCT_DENIABLE | RACCT_SLOPPY,
  166         [RACCT_MSGQSIZE] =
  167                 RACCT_RECLAIMABLE | RACCT_DENIABLE | RACCT_SLOPPY,
  168         [RACCT_NMSGQ] =
  169                 RACCT_RECLAIMABLE | RACCT_DENIABLE | RACCT_SLOPPY,
  170         [RACCT_NSEM] =
  171                 RACCT_RECLAIMABLE | RACCT_DENIABLE | RACCT_SLOPPY,
  172         [RACCT_NSEMOP] =
  173                 RACCT_RECLAIMABLE | RACCT_INHERITABLE | RACCT_DENIABLE,
  174         [RACCT_NSHM] =
  175                 RACCT_RECLAIMABLE | RACCT_DENIABLE | RACCT_SLOPPY,
  176         [RACCT_SHMSIZE] =
  177                 RACCT_RECLAIMABLE | RACCT_DENIABLE | RACCT_SLOPPY,
  178         [RACCT_WALLCLOCK] =
  179                 RACCT_IN_MILLIONS,
  180         [RACCT_PCTCPU] =
  181                 RACCT_DECAYING | RACCT_DENIABLE | RACCT_IN_MILLIONS,
  182         [RACCT_READBPS] =
  183                 RACCT_DECAYING,
  184         [RACCT_WRITEBPS] =
  185                 RACCT_DECAYING,
  186         [RACCT_READIOPS] =
  187                 RACCT_DECAYING,
  188         [RACCT_WRITEIOPS] =
  189                 RACCT_DECAYING };
  190 
  191 static const fixpt_t RACCT_DECAY_FACTOR = 0.3 * FSCALE;
  192 
  193 #ifdef SCHED_4BSD
  194 /*
  195  * Contains intermediate values for %cpu calculations to avoid using floating
  196  * point in the kernel.
  197  * ccpu_exp[k] = FSCALE * (ccpu/FSCALE)^k = FSCALE * exp(-k/20)
  198  * It is needed only for the 4BSD scheduler, because in ULE, the ccpu equals to
  199  * zero so the calculations are more straightforward.
  200  */
  201 fixpt_t ccpu_exp[] = {
  202         [0] = FSCALE * 1,
  203         [1] = FSCALE * 0.95122942450071400909,
  204         [2] = FSCALE * 0.90483741803595957316,
  205         [3] = FSCALE * 0.86070797642505780722,
  206         [4] = FSCALE * 0.81873075307798185866,
  207         [5] = FSCALE * 0.77880078307140486824,
  208         [6] = FSCALE * 0.74081822068171786606,
  209         [7] = FSCALE * 0.70468808971871343435,
  210         [8] = FSCALE * 0.67032004603563930074,
  211         [9] = FSCALE * 0.63762815162177329314,
  212         [10] = FSCALE * 0.60653065971263342360,
  213         [11] = FSCALE * 0.57694981038048669531,
  214         [12] = FSCALE * 0.54881163609402643262,
  215         [13] = FSCALE * 0.52204577676101604789,
  216         [14] = FSCALE * 0.49658530379140951470,
  217         [15] = FSCALE * 0.47236655274101470713,
  218         [16] = FSCALE * 0.44932896411722159143,
  219         [17] = FSCALE * 0.42741493194872666992,
  220         [18] = FSCALE * 0.40656965974059911188,
  221         [19] = FSCALE * 0.38674102345450120691,
  222         [20] = FSCALE * 0.36787944117144232159,
  223         [21] = FSCALE * 0.34993774911115535467,
  224         [22] = FSCALE * 0.33287108369807955328,
  225         [23] = FSCALE * 0.31663676937905321821,
  226         [24] = FSCALE * 0.30119421191220209664,
  227         [25] = FSCALE * 0.28650479686019010032,
  228         [26] = FSCALE * 0.27253179303401260312,
  229         [27] = FSCALE * 0.25924026064589150757,
  230         [28] = FSCALE * 0.24659696394160647693,
  231         [29] = FSCALE * 0.23457028809379765313,
  232         [30] = FSCALE * 0.22313016014842982893,
  233         [31] = FSCALE * 0.21224797382674305771,
  234         [32] = FSCALE * 0.20189651799465540848,
  235         [33] = FSCALE * 0.19204990862075411423,
  236         [34] = FSCALE * 0.18268352405273465022,
  237         [35] = FSCALE * 0.17377394345044512668,
  238         [36] = FSCALE * 0.16529888822158653829,
  239         [37] = FSCALE * 0.15723716631362761621,
  240         [38] = FSCALE * 0.14956861922263505264,
  241         [39] = FSCALE * 0.14227407158651357185,
  242         [40] = FSCALE * 0.13533528323661269189,
  243         [41] = FSCALE * 0.12873490358780421886,
  244         [42] = FSCALE * 0.12245642825298191021,
  245         [43] = FSCALE * 0.11648415777349695786,
  246         [44] = FSCALE * 0.11080315836233388333,
  247         [45] = FSCALE * 0.10539922456186433678,
  248         [46] = FSCALE * 0.10025884372280373372,
  249         [47] = FSCALE * 0.09536916221554961888,
  250         [48] = FSCALE * 0.09071795328941250337,
  251         [49] = FSCALE * 0.08629358649937051097,
  252         [50] = FSCALE * 0.08208499862389879516,
  253         [51] = FSCALE * 0.07808166600115315231,
  254         [52] = FSCALE * 0.07427357821433388042,
  255         [53] = FSCALE * 0.07065121306042958674,
  256         [54] = FSCALE * 0.06720551273974976512,
  257         [55] = FSCALE * 0.06392786120670757270,
  258         [56] = FSCALE * 0.06081006262521796499,
  259         [57] = FSCALE * 0.05784432087483846296,
  260         [58] = FSCALE * 0.05502322005640722902,
  261         [59] = FSCALE * 0.05233970594843239308,
  262         [60] = FSCALE * 0.04978706836786394297,
  263         [61] = FSCALE * 0.04735892439114092119,
  264         [62] = FSCALE * 0.04504920239355780606,
  265         [63] = FSCALE * 0.04285212686704017991,
  266         [64] = FSCALE * 0.04076220397836621516,
  267         [65] = FSCALE * 0.03877420783172200988,
  268         [66] = FSCALE * 0.03688316740124000544,
  269         [67] = FSCALE * 0.03508435410084502588,
  270         [68] = FSCALE * 0.03337326996032607948,
  271         [69] = FSCALE * 0.03174563637806794323,
  272         [70] = FSCALE * 0.03019738342231850073,
  273         [71] = FSCALE * 0.02872463965423942912,
  274         [72] = FSCALE * 0.02732372244729256080,
  275         [73] = FSCALE * 0.02599112877875534358,
  276         [74] = FSCALE * 0.02472352647033939120,
  277         [75] = FSCALE * 0.02351774585600910823,
  278         [76] = FSCALE * 0.02237077185616559577,
  279         [77] = FSCALE * 0.02127973643837716938,
  280         [78] = FSCALE * 0.02024191144580438847,
  281         [79] = FSCALE * 0.01925470177538692429,
  282         [80] = FSCALE * 0.01831563888873418029,
  283         [81] = FSCALE * 0.01742237463949351138,
  284         [82] = FSCALE * 0.01657267540176124754,
  285         [83] = FSCALE * 0.01576441648485449082,
  286         [84] = FSCALE * 0.01499557682047770621,
  287         [85] = FSCALE * 0.01426423390899925527,
  288         [86] = FSCALE * 0.01356855901220093175,
  289         [87] = FSCALE * 0.01290681258047986886,
  290         [88] = FSCALE * 0.01227733990306844117,
  291         [89] = FSCALE * 0.01167856697039544521,
  292         [90] = FSCALE * 0.01110899653824230649,
  293         [91] = FSCALE * 0.01056720438385265337,
  294         [92] = FSCALE * 0.01005183574463358164,
  295         [93] = FSCALE * 0.00956160193054350793,
  296         [94] = FSCALE * 0.00909527710169581709,
  297         [95] = FSCALE * 0.00865169520312063417,
  298         [96] = FSCALE * 0.00822974704902002884,
  299         [97] = FSCALE * 0.00782837754922577143,
  300         [98] = FSCALE * 0.00744658307092434051,
  301         [99] = FSCALE * 0.00708340892905212004,
  302         [100] = FSCALE * 0.00673794699908546709,
  303         [101] = FSCALE * 0.00640933344625638184,
  304         [102] = FSCALE * 0.00609674656551563610,
  305         [103] = FSCALE * 0.00579940472684214321,
  306         [104] = FSCALE * 0.00551656442076077241,
  307         [105] = FSCALE * 0.00524751839918138427,
  308         [106] = FSCALE * 0.00499159390691021621,
  309         [107] = FSCALE * 0.00474815099941147558,
  310         [108] = FSCALE * 0.00451658094261266798,
  311         [109] = FSCALE * 0.00429630469075234057,
  312         [110] = FSCALE * 0.00408677143846406699,
  313 };
  314 #endif
  315 
  316 #define CCPU_EXP_MAX    110
  317 
  318 /*
  319  * This function is analogical to the getpcpu() function in the ps(1) command.
  320  * They should both calculate in the same way so that the racct %cpu
  321  * calculations are consistent with the values showed by the ps(1) tool.
  322  * The calculations are more complex in the 4BSD scheduler because of the value
  323  * of the ccpu variable.  In ULE it is defined to be zero which saves us some
  324  * work.
  325  */
  326 static uint64_t
  327 racct_getpcpu(struct proc *p, u_int pcpu)
  328 {
  329         u_int swtime;
  330 #ifdef SCHED_4BSD
  331         fixpt_t pctcpu, pctcpu_next;
  332 #endif
  333 #ifdef SMP
  334         struct pcpu *pc;
  335         int found;
  336 #endif
  337         fixpt_t p_pctcpu;
  338         struct thread *td;
  339 
  340         ASSERT_RACCT_ENABLED();
  341 
  342         /*
  343          * If the process is swapped out, we count its %cpu usage as zero.
  344          * This behaviour is consistent with the userland ps(1) tool.
  345          */
  346         if ((p->p_flag & P_INMEM) == 0)
  347                 return (0);
  348         swtime = (ticks - p->p_swtick) / hz;
  349 
  350         /*
  351          * For short-lived processes, the sched_pctcpu() returns small
  352          * values even for cpu intensive processes.  Therefore we use
  353          * our own estimate in this case.
  354          */
  355         if (swtime < RACCT_PCPU_SECS)
  356                 return (pcpu);
  357 
  358         p_pctcpu = 0;
  359         FOREACH_THREAD_IN_PROC(p, td) {
  360                 if (td == PCPU_GET(idlethread))
  361                         continue;
  362 #ifdef SMP
  363                 found = 0;
  364                 STAILQ_FOREACH(pc, &cpuhead, pc_allcpu) {
  365                         if (td == pc->pc_idlethread) {
  366                                 found = 1;
  367                                 break;
  368                         }
  369                 }
  370                 if (found)
  371                         continue;
  372 #endif
  373                 thread_lock(td);
  374 #ifdef SCHED_4BSD
  375                 pctcpu = sched_pctcpu(td);
  376                 /* Count also the yet unfinished second. */
  377                 pctcpu_next = (pctcpu * ccpu_exp[1]) >> FSHIFT;
  378                 pctcpu_next += sched_pctcpu_delta(td);
  379                 p_pctcpu += max(pctcpu, pctcpu_next);
  380 #else
  381                 /*
  382                  * In ULE the %cpu statistics are updated on every
  383                  * sched_pctcpu() call.  So special calculations to
  384                  * account for the latest (unfinished) second are
  385                  * not needed.
  386                  */
  387                 p_pctcpu += sched_pctcpu(td);
  388 #endif
  389                 thread_unlock(td);
  390         }
  391 
  392 #ifdef SCHED_4BSD
  393         if (swtime <= CCPU_EXP_MAX)
  394                 return ((100 * (uint64_t)p_pctcpu * 1000000) /
  395                     (FSCALE - ccpu_exp[swtime]));
  396 #endif
  397 
  398         return ((100 * (uint64_t)p_pctcpu * 1000000) / FSCALE);
  399 }
  400 
  401 static void
  402 racct_add_racct(struct racct *dest, const struct racct *src)
  403 {
  404         int i;
  405 
  406         ASSERT_RACCT_ENABLED();
  407         RACCT_LOCK_ASSERT();
  408 
  409         /*
  410          * Update resource usage in dest.
  411          */
  412         for (i = 0; i <= RACCT_MAX; i++) {
  413                 KASSERT(dest->r_resources[i] >= 0,
  414                     ("%s: resource %d propagation meltdown: dest < 0",
  415                     __func__, i));
  416                 KASSERT(src->r_resources[i] >= 0,
  417                     ("%s: resource %d propagation meltdown: src < 0",
  418                     __func__, i));
  419                 dest->r_resources[i] += src->r_resources[i];
  420         }
  421 }
  422 
  423 static void
  424 racct_sub_racct(struct racct *dest, const struct racct *src)
  425 {
  426         int i;
  427 
  428         ASSERT_RACCT_ENABLED();
  429         RACCT_LOCK_ASSERT();
  430 
  431         /*
  432          * Update resource usage in dest.
  433          */
  434         for (i = 0; i <= RACCT_MAX; i++) {
  435                 if (!RACCT_IS_SLOPPY(i) && !RACCT_IS_DECAYING(i)) {
  436                         KASSERT(dest->r_resources[i] >= 0,
  437                             ("%s: resource %d propagation meltdown: dest < 0",
  438                             __func__, i));
  439                         KASSERT(src->r_resources[i] >= 0,
  440                             ("%s: resource %d propagation meltdown: src < 0",
  441                             __func__, i));
  442                         KASSERT(src->r_resources[i] <= dest->r_resources[i],
  443                             ("%s: resource %d propagation meltdown: src > dest",
  444                             __func__, i));
  445                 }
  446                 if (RACCT_CAN_DROP(i)) {
  447                         dest->r_resources[i] -= src->r_resources[i];
  448                         if (dest->r_resources[i] < 0)
  449                                 dest->r_resources[i] = 0;
  450                 }
  451         }
  452 }
  453 
  454 void
  455 racct_create(struct racct **racctp)
  456 {
  457 
  458         if (!racct_enable)
  459                 return;
  460 
  461         SDT_PROBE1(racct, , racct, create, racctp);
  462 
  463         KASSERT(*racctp == NULL, ("racct already allocated"));
  464 
  465         *racctp = uma_zalloc(racct_zone, M_WAITOK | M_ZERO);
  466 }
  467 
  468 static void
  469 racct_destroy_locked(struct racct **racctp)
  470 {
  471         struct racct *racct;
  472         int i;
  473 
  474         ASSERT_RACCT_ENABLED();
  475 
  476         SDT_PROBE1(racct, , racct, destroy, racctp);
  477 
  478         RACCT_LOCK_ASSERT();
  479         KASSERT(racctp != NULL, ("NULL racctp"));
  480         KASSERT(*racctp != NULL, ("NULL racct"));
  481 
  482         racct = *racctp;
  483 
  484         for (i = 0; i <= RACCT_MAX; i++) {
  485                 if (RACCT_IS_SLOPPY(i))
  486                         continue;
  487                 if (!RACCT_IS_RECLAIMABLE(i))
  488                         continue;
  489                 KASSERT(racct->r_resources[i] == 0,
  490                     ("destroying non-empty racct: "
  491                     "%ju allocated for resource %d\n",
  492                     racct->r_resources[i], i));
  493         }
  494         uma_zfree(racct_zone, racct);
  495         *racctp = NULL;
  496 }
  497 
  498 void
  499 racct_destroy(struct racct **racct)
  500 {
  501 
  502         if (!racct_enable)
  503                 return;
  504 
  505         RACCT_LOCK();
  506         racct_destroy_locked(racct);
  507         RACCT_UNLOCK();
  508 }
  509 
  510 /*
  511  * Increase consumption of 'resource' by 'amount' for 'racct',
  512  * but not its parents.  Differently from other cases, 'amount' here
  513  * may be less than zero.
  514  */
  515 static void
  516 racct_adjust_resource(struct racct *racct, int resource,
  517     int64_t amount)
  518 {
  519 
  520         ASSERT_RACCT_ENABLED();
  521         RACCT_LOCK_ASSERT();
  522         KASSERT(racct != NULL, ("NULL racct"));
  523 
  524         racct->r_resources[resource] += amount;
  525         if (racct->r_resources[resource] < 0) {
  526                 KASSERT(RACCT_IS_SLOPPY(resource) || RACCT_IS_DECAYING(resource),
  527                     ("%s: resource %d usage < 0", __func__, resource));
  528                 racct->r_resources[resource] = 0;
  529         }
  530 
  531         /*
  532          * There are some cases where the racct %cpu resource would grow
  533          * beyond 100% per core.  For example in racct_proc_exit() we add
  534          * the process %cpu usage to the ucred racct containers.  If too
  535          * many processes terminated in a short time span, the ucred %cpu
  536          * resource could grow too much.  Also, the 4BSD scheduler sometimes
  537          * returns for a thread more than 100% cpu usage. So we set a sane
  538          * boundary here to 100% * the maxumum number of CPUs.
  539          */
  540         if ((resource == RACCT_PCTCPU) &&
  541             (racct->r_resources[RACCT_PCTCPU] > 100 * 1000000 * (int64_t)MAXCPU))
  542                 racct->r_resources[RACCT_PCTCPU] = 100 * 1000000 * (int64_t)MAXCPU;
  543 }
  544 
  545 static int
  546 racct_add_locked(struct proc *p, int resource, uint64_t amount, int force)
  547 {
  548 #ifdef RCTL
  549         int error;
  550 #endif
  551 
  552         ASSERT_RACCT_ENABLED();
  553 
  554         /*
  555          * We need proc lock to dereference p->p_ucred.
  556          */
  557         PROC_LOCK_ASSERT(p, MA_OWNED);
  558 
  559 #ifdef RCTL
  560         error = rctl_enforce(p, resource, amount);
  561         if (error && !force && RACCT_IS_DENIABLE(resource)) {
  562                 SDT_PROBE3(racct, , rusage, add__failure, p, resource, amount);
  563                 return (error);
  564         }
  565 #endif
  566         racct_adjust_resource(p->p_racct, resource, amount);
  567         racct_add_cred_locked(p->p_ucred, resource, amount);
  568 
  569         return (0);
  570 }
  571 
  572 /*
  573  * Increase allocation of 'resource' by 'amount' for process 'p'.
  574  * Return 0 if it's below limits, or errno, if it's not.
  575  */
  576 int
  577 racct_add(struct proc *p, int resource, uint64_t amount)
  578 {
  579         int error;
  580 
  581         if (!racct_enable)
  582                 return (0);
  583 
  584         SDT_PROBE3(racct, , rusage, add, p, resource, amount);
  585 
  586         RACCT_LOCK();
  587         error = racct_add_locked(p, resource, amount, 0);
  588         RACCT_UNLOCK();
  589         return (error);
  590 }
  591 
  592 /*
  593  * Increase allocation of 'resource' by 'amount' for process 'p'.
  594  * Doesn't check for limits and never fails.
  595  */
  596 void
  597 racct_add_force(struct proc *p, int resource, uint64_t amount)
  598 {
  599 
  600         if (!racct_enable)
  601                 return;
  602 
  603         SDT_PROBE3(racct, , rusage, add__force, p, resource, amount);
  604 
  605         RACCT_LOCK();
  606         racct_add_locked(p, resource, amount, 1);
  607         RACCT_UNLOCK();
  608 }
  609 
  610 static void
  611 racct_add_cred_locked(struct ucred *cred, int resource, uint64_t amount)
  612 {
  613         struct prison *pr;
  614 
  615         ASSERT_RACCT_ENABLED();
  616 
  617         racct_adjust_resource(cred->cr_ruidinfo->ui_racct, resource, amount);
  618         for (pr = cred->cr_prison; pr != NULL; pr = pr->pr_parent)
  619                 racct_adjust_resource(pr->pr_prison_racct->prr_racct, resource,
  620                     amount);
  621         racct_adjust_resource(cred->cr_loginclass->lc_racct, resource, amount);
  622 }
  623 
  624 /*
  625  * Increase allocation of 'resource' by 'amount' for credential 'cred'.
  626  * Doesn't check for limits and never fails.
  627  */
  628 void
  629 racct_add_cred(struct ucred *cred, int resource, uint64_t amount)
  630 {
  631 
  632         if (!racct_enable)
  633                 return;
  634 
  635         SDT_PROBE3(racct, , rusage, add__cred, cred, resource, amount);
  636 
  637         RACCT_LOCK();
  638         racct_add_cred_locked(cred, resource, amount);
  639         RACCT_UNLOCK();
  640 }
  641 
  642 /*
  643  * Account for disk IO resource consumption.  Checks for limits,
  644  * but never fails, due to disk limits being undeniable.
  645  */
  646 void
  647 racct_add_buf(struct proc *p, const struct buf *bp, int is_write)
  648 {
  649 
  650         ASSERT_RACCT_ENABLED();
  651         PROC_LOCK_ASSERT(p, MA_OWNED);
  652 
  653         SDT_PROBE3(racct, , rusage, add__buf, p, bp, is_write);
  654 
  655         RACCT_LOCK();
  656         if (is_write) {
  657                 racct_add_locked(curproc, RACCT_WRITEBPS, bp->b_bcount, 1);
  658                 racct_add_locked(curproc, RACCT_WRITEIOPS, 1, 1);
  659         } else {
  660                 racct_add_locked(curproc, RACCT_READBPS, bp->b_bcount, 1);
  661                 racct_add_locked(curproc, RACCT_READIOPS, 1, 1);
  662         }
  663         RACCT_UNLOCK();
  664 }
  665 
  666 static int
  667 racct_set_locked(struct proc *p, int resource, uint64_t amount, int force)
  668 {
  669         int64_t old_amount, decayed_amount, diff_proc, diff_cred;
  670 #ifdef RCTL
  671         int error;
  672 #endif
  673 
  674         ASSERT_RACCT_ENABLED();
  675 
  676         /*
  677          * We need proc lock to dereference p->p_ucred.
  678          */
  679         PROC_LOCK_ASSERT(p, MA_OWNED);
  680 
  681         old_amount = p->p_racct->r_resources[resource];
  682         /*
  683          * The diffs may be negative.
  684          */
  685         diff_proc = amount - old_amount;
  686         if (resource == RACCT_PCTCPU) {
  687                 /*
  688                  * Resources in per-credential racct containers may decay.
  689                  * If this is the case, we need to calculate the difference
  690                  * between the new amount and the proportional value of the
  691                  * old amount that has decayed in the ucred racct containers.
  692                  */
  693                 decayed_amount = old_amount * RACCT_DECAY_FACTOR / FSCALE;
  694                 diff_cred = amount - decayed_amount;
  695         } else
  696                 diff_cred = diff_proc;
  697 #ifdef notyet
  698         KASSERT(diff_proc >= 0 || RACCT_CAN_DROP(resource),
  699             ("%s: usage of non-droppable resource %d dropping", __func__,
  700              resource));
  701 #endif
  702 #ifdef RCTL
  703         if (diff_proc > 0) {
  704                 error = rctl_enforce(p, resource, diff_proc);
  705                 if (error && !force && RACCT_IS_DENIABLE(resource)) {
  706                         SDT_PROBE3(racct, , rusage, set__failure, p, resource,
  707                             amount);
  708                         return (error);
  709                 }
  710         }
  711 #endif
  712         racct_adjust_resource(p->p_racct, resource, diff_proc);
  713         if (diff_cred > 0)
  714                 racct_add_cred_locked(p->p_ucred, resource, diff_cred);
  715         else if (diff_cred < 0)
  716                 racct_sub_cred_locked(p->p_ucred, resource, -diff_cred);
  717 
  718         return (0);
  719 }
  720 
  721 /*
  722  * Set allocation of 'resource' to 'amount' for process 'p'.
  723  * Return 0 if it's below limits, or errno, if it's not.
  724  *
  725  * Note that decreasing the allocation always returns 0,
  726  * even if it's above the limit.
  727  */
  728 int
  729 racct_set_unlocked(struct proc *p, int resource, uint64_t amount)
  730 {
  731         int error;
  732 
  733         ASSERT_RACCT_ENABLED();
  734         PROC_LOCK(p);
  735         error = racct_set(p, resource, amount);
  736         PROC_UNLOCK(p);
  737         return (error);
  738 }
  739 
  740 int
  741 racct_set(struct proc *p, int resource, uint64_t amount)
  742 {
  743         int error;
  744 
  745         if (!racct_enable)
  746                 return (0);
  747 
  748         SDT_PROBE3(racct, , rusage, set__force, p, resource, amount);
  749 
  750         RACCT_LOCK();
  751         error = racct_set_locked(p, resource, amount, 0);
  752         RACCT_UNLOCK();
  753         return (error);
  754 }
  755 
  756 void
  757 racct_set_force(struct proc *p, int resource, uint64_t amount)
  758 {
  759 
  760         if (!racct_enable)
  761                 return;
  762 
  763         SDT_PROBE3(racct, , rusage, set, p, resource, amount);
  764 
  765         RACCT_LOCK();
  766         racct_set_locked(p, resource, amount, 1);
  767         RACCT_UNLOCK();
  768 }
  769 
  770 /*
  771  * Returns amount of 'resource' the process 'p' can keep allocated.
  772  * Allocating more than that would be denied, unless the resource
  773  * is marked undeniable.  Amount of already allocated resource does
  774  * not matter.
  775  */
  776 uint64_t
  777 racct_get_limit(struct proc *p, int resource)
  778 {
  779 #ifdef RCTL
  780         uint64_t available;
  781 
  782         if (!racct_enable)
  783                 return (UINT64_MAX);
  784 
  785         RACCT_LOCK();
  786         available = rctl_get_limit(p, resource);
  787         RACCT_UNLOCK();
  788 
  789         return (available);
  790 #else
  791 
  792         return (UINT64_MAX);
  793 #endif
  794 }
  795 
  796 /*
  797  * Returns amount of 'resource' the process 'p' can keep allocated.
  798  * Allocating more than that would be denied, unless the resource
  799  * is marked undeniable.  Amount of already allocated resource does
  800  * matter.
  801  */
  802 uint64_t
  803 racct_get_available(struct proc *p, int resource)
  804 {
  805 #ifdef RCTL
  806         uint64_t available;
  807 
  808         if (!racct_enable)
  809                 return (UINT64_MAX);
  810 
  811         RACCT_LOCK();
  812         available = rctl_get_available(p, resource);
  813         RACCT_UNLOCK();
  814 
  815         return (available);
  816 #else
  817 
  818         return (UINT64_MAX);
  819 #endif
  820 }
  821 
  822 /*
  823  * Returns amount of the %cpu resource that process 'p' can add to its %cpu
  824  * utilization.  Adding more than that would lead to the process being
  825  * throttled.
  826  */
  827 static int64_t
  828 racct_pcpu_available(struct proc *p)
  829 {
  830 #ifdef RCTL
  831         uint64_t available;
  832 
  833         ASSERT_RACCT_ENABLED();
  834 
  835         RACCT_LOCK();
  836         available = rctl_pcpu_available(p);
  837         RACCT_UNLOCK();
  838 
  839         return (available);
  840 #else
  841 
  842         return (INT64_MAX);
  843 #endif
  844 }
  845 
  846 /*
  847  * Decrease allocation of 'resource' by 'amount' for process 'p'.
  848  */
  849 void
  850 racct_sub(struct proc *p, int resource, uint64_t amount)
  851 {
  852 
  853         if (!racct_enable)
  854                 return;
  855 
  856         SDT_PROBE3(racct, , rusage, sub, p, resource, amount);
  857 
  858         /*
  859          * We need proc lock to dereference p->p_ucred.
  860          */
  861         PROC_LOCK_ASSERT(p, MA_OWNED);
  862         KASSERT(RACCT_CAN_DROP(resource),
  863             ("%s: called for non-droppable resource %d", __func__, resource));
  864 
  865         RACCT_LOCK();
  866         KASSERT(amount <= p->p_racct->r_resources[resource],
  867             ("%s: freeing %ju of resource %d, which is more "
  868              "than allocated %jd for %s (pid %d)", __func__, amount, resource,
  869             (intmax_t)p->p_racct->r_resources[resource], p->p_comm, p->p_pid));
  870 
  871         racct_adjust_resource(p->p_racct, resource, -amount);
  872         racct_sub_cred_locked(p->p_ucred, resource, amount);
  873         RACCT_UNLOCK();
  874 }
  875 
  876 static void
  877 racct_sub_cred_locked(struct ucred *cred, int resource, uint64_t amount)
  878 {
  879         struct prison *pr;
  880 
  881         ASSERT_RACCT_ENABLED();
  882 
  883         racct_adjust_resource(cred->cr_ruidinfo->ui_racct, resource, -amount);
  884         for (pr = cred->cr_prison; pr != NULL; pr = pr->pr_parent)
  885                 racct_adjust_resource(pr->pr_prison_racct->prr_racct, resource,
  886                     -amount);
  887         racct_adjust_resource(cred->cr_loginclass->lc_racct, resource, -amount);
  888 }
  889 
  890 /*
  891  * Decrease allocation of 'resource' by 'amount' for credential 'cred'.
  892  */
  893 void
  894 racct_sub_cred(struct ucred *cred, int resource, uint64_t amount)
  895 {
  896 
  897         if (!racct_enable)
  898                 return;
  899 
  900         SDT_PROBE3(racct, , rusage, sub__cred, cred, resource, amount);
  901 
  902 #ifdef notyet
  903         KASSERT(RACCT_CAN_DROP(resource),
  904             ("%s: called for resource %d which can not drop", __func__,
  905              resource));
  906 #endif
  907 
  908         RACCT_LOCK();
  909         racct_sub_cred_locked(cred, resource, amount);
  910         RACCT_UNLOCK();
  911 }
  912 
  913 /*
  914  * Inherit resource usage information from the parent process.
  915  */
  916 int
  917 racct_proc_fork(struct proc *parent, struct proc *child)
  918 {
  919         int i, error = 0;
  920 
  921         if (!racct_enable)
  922                 return (0);
  923 
  924         /*
  925          * Create racct for the child process.
  926          */
  927         racct_create(&child->p_racct);
  928 
  929         PROC_LOCK(parent);
  930         PROC_LOCK(child);
  931         RACCT_LOCK();
  932 
  933 #ifdef RCTL
  934         error = rctl_proc_fork(parent, child);
  935         if (error != 0)
  936                 goto out;
  937 #endif
  938 
  939         /* Init process cpu time. */
  940         child->p_prev_runtime = 0;
  941         child->p_throttled = 0;
  942 
  943         /*
  944          * Inherit resource usage.
  945          */
  946         for (i = 0; i <= RACCT_MAX; i++) {
  947                 if (parent->p_racct->r_resources[i] == 0 ||
  948                     !RACCT_IS_INHERITABLE(i))
  949                         continue;
  950 
  951                 error = racct_set_locked(child, i,
  952                     parent->p_racct->r_resources[i], 0);
  953                 if (error != 0)
  954                         goto out;
  955         }
  956 
  957         error = racct_add_locked(child, RACCT_NPROC, 1, 0);
  958         error += racct_add_locked(child, RACCT_NTHR, 1, 0);
  959 
  960 out:
  961         RACCT_UNLOCK();
  962         PROC_UNLOCK(child);
  963         PROC_UNLOCK(parent);
  964 
  965         if (error != 0)
  966                 racct_proc_exit(child);
  967 
  968         return (error);
  969 }
  970 
  971 /*
  972  * Called at the end of fork1(), to handle rules that require the process
  973  * to be fully initialized.
  974  */
  975 void
  976 racct_proc_fork_done(struct proc *child)
  977 {
  978 
  979         if (!racct_enable)
  980                 return;
  981 
  982 #ifdef RCTL
  983         PROC_LOCK(child);
  984         RACCT_LOCK();
  985         rctl_enforce(child, RACCT_NPROC, 0);
  986         rctl_enforce(child, RACCT_NTHR, 0);
  987         RACCT_UNLOCK();
  988         PROC_UNLOCK(child);
  989 #endif
  990 }
  991 
  992 void
  993 racct_proc_exit(struct proc *p)
  994 {
  995         struct timeval wallclock;
  996         uint64_t pct_estimate, pct, runtime;
  997         int i;
  998 
  999         if (!racct_enable)
 1000                 return;
 1001 
 1002         PROC_LOCK(p);
 1003         /*
 1004          * We don't need to calculate rux, proc_reap() has already done this.
 1005          */
 1006         runtime = cputick2usec(p->p_rux.rux_runtime);
 1007 #ifdef notyet
 1008         KASSERT(runtime >= p->p_prev_runtime, ("runtime < p_prev_runtime"));
 1009 #else
 1010         if (runtime < p->p_prev_runtime)
 1011                 runtime = p->p_prev_runtime;
 1012 #endif
 1013         microuptime(&wallclock);
 1014         timevalsub(&wallclock, &p->p_stats->p_start);
 1015         if (wallclock.tv_sec > 0 || wallclock.tv_usec > 0) {
 1016                 pct_estimate = (1000000 * runtime * 100) /
 1017                     ((uint64_t)wallclock.tv_sec * 1000000 +
 1018                     wallclock.tv_usec);
 1019         } else
 1020                 pct_estimate = 0;
 1021         pct = racct_getpcpu(p, pct_estimate);
 1022 
 1023         RACCT_LOCK();
 1024         racct_set_locked(p, RACCT_CPU, runtime, 0);
 1025         racct_add_cred_locked(p->p_ucred, RACCT_PCTCPU, pct);
 1026 
 1027         KASSERT(p->p_racct->r_resources[RACCT_RSS] == 0,
 1028             ("process reaped with %ju allocated for RSS\n",
 1029             p->p_racct->r_resources[RACCT_RSS]));
 1030         for (i = 0; i <= RACCT_MAX; i++) {
 1031                 if (p->p_racct->r_resources[i] == 0)
 1032                         continue;
 1033                 if (!RACCT_IS_RECLAIMABLE(i))
 1034                         continue;
 1035                 racct_set_locked(p, i, 0, 0);
 1036         }
 1037 
 1038 #ifdef RCTL
 1039         rctl_racct_release(p->p_racct);
 1040 #endif
 1041         racct_destroy_locked(&p->p_racct);
 1042         RACCT_UNLOCK();
 1043         PROC_UNLOCK(p);
 1044 }
 1045 
 1046 /*
 1047  * Called after credentials change, to move resource utilisation
 1048  * between raccts.
 1049  */
 1050 void
 1051 racct_proc_ucred_changed(struct proc *p, struct ucred *oldcred,
 1052     struct ucred *newcred)
 1053 {
 1054         struct uidinfo *olduip, *newuip;
 1055         struct loginclass *oldlc, *newlc;
 1056         struct prison *oldpr, *newpr, *pr;
 1057 
 1058         if (!racct_enable)
 1059                 return;
 1060 
 1061         PROC_LOCK_ASSERT(p, MA_OWNED);
 1062 
 1063         newuip = newcred->cr_ruidinfo;
 1064         olduip = oldcred->cr_ruidinfo;
 1065         newlc = newcred->cr_loginclass;
 1066         oldlc = oldcred->cr_loginclass;
 1067         newpr = newcred->cr_prison;
 1068         oldpr = oldcred->cr_prison;
 1069 
 1070         RACCT_LOCK();
 1071         if (newuip != olduip) {
 1072                 racct_sub_racct(olduip->ui_racct, p->p_racct);
 1073                 racct_add_racct(newuip->ui_racct, p->p_racct);
 1074         }
 1075         if (newlc != oldlc) {
 1076                 racct_sub_racct(oldlc->lc_racct, p->p_racct);
 1077                 racct_add_racct(newlc->lc_racct, p->p_racct);
 1078         }
 1079         if (newpr != oldpr) {
 1080                 for (pr = oldpr; pr != NULL; pr = pr->pr_parent)
 1081                         racct_sub_racct(pr->pr_prison_racct->prr_racct,
 1082                             p->p_racct);
 1083                 for (pr = newpr; pr != NULL; pr = pr->pr_parent)
 1084                         racct_add_racct(pr->pr_prison_racct->prr_racct,
 1085                             p->p_racct);
 1086         }
 1087         RACCT_UNLOCK();
 1088 }
 1089 
 1090 void
 1091 racct_move(struct racct *dest, struct racct *src)
 1092 {
 1093 
 1094         ASSERT_RACCT_ENABLED();
 1095 
 1096         RACCT_LOCK();
 1097         racct_add_racct(dest, src);
 1098         racct_sub_racct(src, src);
 1099         RACCT_UNLOCK();
 1100 }
 1101 
 1102 void
 1103 racct_proc_throttled(struct proc *p)
 1104 {
 1105 
 1106         ASSERT_RACCT_ENABLED();
 1107 
 1108         PROC_LOCK(p);
 1109         while (p->p_throttled != 0) {
 1110                 msleep(p->p_racct, &p->p_mtx, 0, "racct",
 1111                     p->p_throttled < 0 ? 0 : p->p_throttled);
 1112                 if (p->p_throttled > 0)
 1113                         p->p_throttled = 0;
 1114         }
 1115         PROC_UNLOCK(p);
 1116 }
 1117 
 1118 /*
 1119  * Make the process sleep in userret() for 'timeout' ticks.  Setting
 1120  * timeout to -1 makes it sleep until woken up by racct_proc_wakeup().
 1121  */
 1122 void
 1123 racct_proc_throttle(struct proc *p, int timeout)
 1124 {
 1125         struct thread *td;
 1126 #ifdef SMP
 1127         int cpuid;
 1128 #endif
 1129 
 1130         KASSERT(timeout != 0, ("timeout %d", timeout));
 1131         ASSERT_RACCT_ENABLED();
 1132         PROC_LOCK_ASSERT(p, MA_OWNED);
 1133 
 1134         /*
 1135          * Do not block kernel processes.  Also do not block processes with
 1136          * low %cpu utilization to improve interactivity.
 1137          */
 1138         if ((p->p_flag & (P_SYSTEM | P_KPROC)) != 0)
 1139                 return;
 1140 
 1141         if (p->p_throttled < 0 || (timeout > 0 && p->p_throttled > timeout))
 1142                 return;
 1143 
 1144         p->p_throttled = timeout;
 1145 
 1146         FOREACH_THREAD_IN_PROC(p, td) {
 1147                 thread_lock(td);
 1148                 td->td_flags |= TDF_ASTPENDING;
 1149 
 1150                 switch (td->td_state) {
 1151                 case TDS_RUNQ:
 1152                         /*
 1153                          * If the thread is on the scheduler run-queue, we can
 1154                          * not just remove it from there.  So we set the flag
 1155                          * TDF_NEEDRESCHED for the thread, so that once it is
 1156                          * running, it is taken off the cpu as soon as possible.
 1157                          */
 1158                         td->td_flags |= TDF_NEEDRESCHED;
 1159                         break;
 1160                 case TDS_RUNNING:
 1161                         /*
 1162                          * If the thread is running, we request a context
 1163                          * switch for it by setting the TDF_NEEDRESCHED flag.
 1164                          */
 1165                         td->td_flags |= TDF_NEEDRESCHED;
 1166 #ifdef SMP
 1167                         cpuid = td->td_oncpu;
 1168                         if ((cpuid != NOCPU) && (td != curthread))
 1169                                 ipi_cpu(cpuid, IPI_AST);
 1170 #endif
 1171                         break;
 1172                 default:
 1173                         break;
 1174                 }
 1175                 thread_unlock(td);
 1176         }
 1177 }
 1178 
 1179 static void
 1180 racct_proc_wakeup(struct proc *p)
 1181 {
 1182 
 1183         ASSERT_RACCT_ENABLED();
 1184 
 1185         PROC_LOCK_ASSERT(p, MA_OWNED);
 1186 
 1187         if (p->p_throttled != 0) {
 1188                 p->p_throttled = 0;
 1189                 wakeup(p->p_racct);
 1190         }
 1191 }
 1192 
 1193 static void
 1194 racct_decay_callback(struct racct *racct, void *dummy1, void *dummy2)
 1195 {
 1196         int64_t r_old, r_new;
 1197 
 1198         ASSERT_RACCT_ENABLED();
 1199         RACCT_LOCK_ASSERT();
 1200 
 1201 #ifdef RCTL
 1202         rctl_throttle_decay(racct, RACCT_READBPS);
 1203         rctl_throttle_decay(racct, RACCT_WRITEBPS);
 1204         rctl_throttle_decay(racct, RACCT_READIOPS);
 1205         rctl_throttle_decay(racct, RACCT_WRITEIOPS);
 1206 #endif
 1207 
 1208         r_old = racct->r_resources[RACCT_PCTCPU];
 1209 
 1210         /* If there is nothing to decay, just exit. */
 1211         if (r_old <= 0)
 1212                 return;
 1213 
 1214         r_new = r_old * RACCT_DECAY_FACTOR / FSCALE;
 1215         racct->r_resources[RACCT_PCTCPU] = r_new;
 1216 }
 1217 
 1218 static void
 1219 racct_decay_pre(void)
 1220 {
 1221 
 1222         RACCT_LOCK();
 1223 }
 1224 
 1225 static void
 1226 racct_decay_post(void)
 1227 {
 1228 
 1229         RACCT_UNLOCK();
 1230 }
 1231 
 1232 static void
 1233 racct_decay(void)
 1234 {
 1235 
 1236         ASSERT_RACCT_ENABLED();
 1237 
 1238         ui_racct_foreach(racct_decay_callback, racct_decay_pre,
 1239             racct_decay_post, NULL, NULL);
 1240         loginclass_racct_foreach(racct_decay_callback, racct_decay_pre,
 1241             racct_decay_post, NULL, NULL);
 1242         prison_racct_foreach(racct_decay_callback, racct_decay_pre,
 1243             racct_decay_post, NULL, NULL);
 1244 }
 1245 
 1246 static void
 1247 racctd(void)
 1248 {
 1249         struct thread *td;
 1250         struct proc *p;
 1251         struct timeval wallclock;
 1252         uint64_t pct, pct_estimate, runtime;
 1253 
 1254         ASSERT_RACCT_ENABLED();
 1255 
 1256         for (;;) {
 1257                 racct_decay();
 1258 
 1259                 sx_slock(&allproc_lock);
 1260 
 1261                 FOREACH_PROC_IN_SYSTEM(p) {
 1262                         PROC_LOCK(p);
 1263                         if (p->p_state != PRS_NORMAL) {
 1264                                 if (p->p_state == PRS_ZOMBIE)
 1265                                         racct_set(p, RACCT_PCTCPU, 0);
 1266                                 PROC_UNLOCK(p);
 1267                                 continue;
 1268                         }
 1269 
 1270                         microuptime(&wallclock);
 1271                         timevalsub(&wallclock, &p->p_stats->p_start);
 1272                         PROC_STATLOCK(p);
 1273                         FOREACH_THREAD_IN_PROC(p, td)
 1274                                 ruxagg(p, td);
 1275                         runtime = cputick2usec(p->p_rux.rux_runtime);
 1276                         PROC_STATUNLOCK(p);
 1277 #ifdef notyet
 1278                         KASSERT(runtime >= p->p_prev_runtime,
 1279                             ("runtime < p_prev_runtime"));
 1280 #else
 1281                         if (runtime < p->p_prev_runtime)
 1282                                 runtime = p->p_prev_runtime;
 1283 #endif
 1284                         p->p_prev_runtime = runtime;
 1285                         if (wallclock.tv_sec > 0 || wallclock.tv_usec > 0) {
 1286                                 pct_estimate = (1000000 * runtime * 100) /
 1287                                     ((uint64_t)wallclock.tv_sec * 1000000 +
 1288                                     wallclock.tv_usec);
 1289                         } else
 1290                                 pct_estimate = 0;
 1291                         pct = racct_getpcpu(p, pct_estimate);
 1292                         RACCT_LOCK();
 1293 #ifdef RCTL
 1294                         rctl_throttle_decay(p->p_racct, RACCT_READBPS);
 1295                         rctl_throttle_decay(p->p_racct, RACCT_WRITEBPS);
 1296                         rctl_throttle_decay(p->p_racct, RACCT_READIOPS);
 1297                         rctl_throttle_decay(p->p_racct, RACCT_WRITEIOPS);
 1298 #endif
 1299                         racct_set_locked(p, RACCT_PCTCPU, pct, 1);
 1300                         racct_set_locked(p, RACCT_CPU, runtime, 0);
 1301                         racct_set_locked(p, RACCT_WALLCLOCK,
 1302                             (uint64_t)wallclock.tv_sec * 1000000 +
 1303                             wallclock.tv_usec, 0);
 1304                         RACCT_UNLOCK();
 1305                         PROC_UNLOCK(p);
 1306                 }
 1307 
 1308                 /*
 1309                  * To ensure that processes are throttled in a fair way, we need
 1310                  * to iterate over all processes again and check the limits
 1311                  * for %cpu resource only after ucred racct containers have been
 1312                  * properly filled.
 1313                  */
 1314                 FOREACH_PROC_IN_SYSTEM(p) {
 1315                         PROC_LOCK(p);
 1316                         if (p->p_state != PRS_NORMAL) {
 1317                                 PROC_UNLOCK(p);
 1318                                 continue;
 1319                         }
 1320 
 1321                         if (racct_pcpu_available(p) <= 0) {
 1322                                 if (p->p_racct->r_resources[RACCT_PCTCPU] >
 1323                                     pcpu_threshold)
 1324                                         racct_proc_throttle(p, -1);
 1325                         } else if (p->p_throttled == -1) {
 1326                                 racct_proc_wakeup(p);
 1327                         }
 1328                         PROC_UNLOCK(p);
 1329                 }
 1330                 sx_sunlock(&allproc_lock);
 1331                 pause("-", hz);
 1332         }
 1333 }
 1334 
 1335 static struct kproc_desc racctd_kp = {
 1336         "racctd",
 1337         racctd,
 1338         NULL
 1339 };
 1340 
 1341 static void
 1342 racctd_init(void)
 1343 {
 1344         if (!racct_enable)
 1345                 return;
 1346 
 1347         kproc_start(&racctd_kp);
 1348 }
 1349 SYSINIT(racctd, SI_SUB_RACCTD, SI_ORDER_FIRST, racctd_init, NULL);
 1350 
 1351 static void
 1352 racct_init(void)
 1353 {
 1354         if (!racct_enable)
 1355                 return;
 1356 
 1357         racct_zone = uma_zcreate("racct", sizeof(struct racct),
 1358             NULL, NULL, NULL, NULL, UMA_ALIGN_PTR, 0);
 1359         /*
 1360          * XXX: Move this somewhere.
 1361          */
 1362         prison0.pr_prison_racct = prison_racct_find("");
 1363 }
 1364 SYSINIT(racct, SI_SUB_RACCT, SI_ORDER_FIRST, racct_init, NULL);
 1365 
 1366 #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
