The Design and Implementation of the FreeBSD Operating System, Second Edition
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FreeBSD/Linux Kernel Cross Reference
sys/ddb/db_ps.c

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    1 /*-
    2  * Copyright (c) 1993 The Regents of the University of California.
    3  * All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  * 1. Redistributions of source code must retain the above copyright
    9  *    notice, this list of conditions and the following disclaimer.
   10  * 2. Redistributions in binary form must reproduce the above copyright
   11  *    notice, this list of conditions and the following disclaimer in the
   12  *    documentation and/or other materials provided with the distribution.
   13  * 4. Neither the name of the University nor the names of its contributors
   14  *    may be used to endorse or promote products derived from this software
   15  *    without specific prior written permission.
   16  *
   17  * THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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 
   30 #include <sys/cdefs.h>
   31 __FBSDID("$FreeBSD: releng/11.0/sys/ddb/db_ps.c 298043 2016-04-15 09:13:01Z kib $");
   32 
   33 #include "opt_kstack_pages.h"
   34 
   35 #include <sys/param.h>
   36 #include <sys/cons.h>
   37 #include <sys/jail.h>
   38 #include <sys/kdb.h>
   39 #include <sys/kernel.h>
   40 #include <sys/proc.h>
   41 #include <sys/sysent.h>
   42 #include <sys/systm.h>
   43 #include <sys/_kstack_cache.h>
   44 #include <vm/vm.h>
   45 #include <vm/vm_param.h>
   46 #include <vm/pmap.h>
   47 
   48 #include <ddb/ddb.h>
   49 
   50 static void     dumpthread(volatile struct proc *p, volatile struct thread *td,
   51                     int all);
   52 /*
   53  * At least one non-optional show-command must be implemented using
   54  * DB_SHOW_ALL_COMMAND() so that db_show_all_cmd_set gets created.
   55  * Here is one.
   56  */
   57 DB_SHOW_ALL_COMMAND(procs, db_procs_cmd)
   58 {
   59         db_ps(addr, have_addr, count, modif);
   60 }
   61 
   62 /*
   63  * Layout:
   64  * - column counts
   65  * - header
   66  * - single-threaded process
   67  * - multi-threaded process
   68  * - thread in a MT process
   69  *
   70  *          1         2         3         4         5         6         7
   71  * 1234567890123456789012345678901234567890123456789012345678901234567890
   72  *   pid  ppid  pgrp   uid   state   wmesg     wchan    cmd
   73  * <pid> <ppi> <pgi> <uid>  <stat> < wmesg > < wchan  > <name>
   74  * <pid> <ppi> <pgi> <uid>  <stat>  (threaded)          <command>
   75  * <tid >                   <stat> < wmesg > < wchan  > <name>
   76  *
   77  * For machines with 64-bit pointers, we expand the wchan field 8 more
   78  * characters.
   79  */
   80 void
   81 db_ps(db_expr_t addr, bool hasaddr, db_expr_t count, char *modif)
   82 {
   83         volatile struct proc *p, *pp;
   84         volatile struct thread *td;
   85         struct ucred *cred;
   86         struct pgrp *pgrp;
   87         char state[9];
   88         int np, rflag, sflag, dflag, lflag, wflag;
   89 
   90         np = nprocs;
   91 
   92         if (!LIST_EMPTY(&allproc))
   93                 p = LIST_FIRST(&allproc);
   94         else
   95                 p = &proc0;
   96 
   97 #ifdef __LP64__
   98         db_printf("  pid  ppid  pgrp   uid   state   wmesg         wchan        cmd\n");
   99 #else
  100         db_printf("  pid  ppid  pgrp   uid   state   wmesg     wchan    cmd\n");
  101 #endif
  102         while (--np >= 0 && !db_pager_quit) {
  103                 if (p == NULL) {
  104                         db_printf("oops, ran out of processes early!\n");
  105                         break;
  106                 }
  107                 pp = p->p_pptr;
  108                 if (pp == NULL)
  109                         pp = p;
  110 
  111                 cred = p->p_ucred;
  112                 pgrp = p->p_pgrp;
  113                 db_printf("%5d %5d %5d %5d ", p->p_pid, pp->p_pid,
  114                     pgrp != NULL ? pgrp->pg_id : 0,
  115                     cred != NULL ? cred->cr_ruid : 0);
  116 
  117                 /* Determine our primary process state. */
  118                 switch (p->p_state) {
  119                 case PRS_NORMAL:
  120                         if (P_SHOULDSTOP(p))
  121                                 state[0] = 'T';
  122                         else {
  123                                 /*
  124                                  * One of D, L, R, S, W.  For a
  125                                  * multithreaded process we will use
  126                                  * the state of the thread with the
  127                                  * highest precedence.  The
  128                                  * precendence order from high to low
  129                                  * is R, L, D, S, W.  If no thread is
  130                                  * in a sane state we use '?' for our
  131                                  * primary state.
  132                                  */
  133                                 rflag = sflag = dflag = lflag = wflag = 0;
  134                                 FOREACH_THREAD_IN_PROC(p, td) {
  135                                         if (td->td_state == TDS_RUNNING ||
  136                                             td->td_state == TDS_RUNQ ||
  137                                             td->td_state == TDS_CAN_RUN)
  138                                                 rflag++;
  139                                         if (TD_ON_LOCK(td))
  140                                                 lflag++;
  141                                         if (TD_IS_SLEEPING(td)) {
  142                                                 if (!(td->td_flags & TDF_SINTR))
  143                                                         dflag++;
  144                                                 else
  145                                                         sflag++;
  146                                         }
  147                                         if (TD_AWAITING_INTR(td))
  148                                                 wflag++;
  149                                 }
  150                                 if (rflag)
  151                                         state[0] = 'R';
  152                                 else if (lflag)
  153                                         state[0] = 'L';
  154                                 else if (dflag)
  155                                         state[0] = 'D';
  156                                 else if (sflag)
  157                                         state[0] = 'S';
  158                                 else if (wflag)
  159                                         state[0] = 'W';
  160                                 else
  161                                         state[0] = '?';
  162                         }
  163                         break;
  164                 case PRS_NEW:
  165                         state[0] = 'N';
  166                         break;
  167                 case PRS_ZOMBIE:
  168                         state[0] = 'Z';
  169                         break;
  170                 default:
  171                         state[0] = 'U';
  172                         break;
  173                 }
  174                 state[1] = '\0';
  175 
  176                 /* Additional process state flags. */
  177                 if (!(p->p_flag & P_INMEM))
  178                         strlcat(state, "W", sizeof(state));
  179                 if (p->p_flag & P_TRACED)
  180                         strlcat(state, "X", sizeof(state));
  181                 if (p->p_flag & P_WEXIT && p->p_state != PRS_ZOMBIE)
  182                         strlcat(state, "E", sizeof(state));
  183                 if (p->p_flag & P_PPWAIT)
  184                         strlcat(state, "V", sizeof(state));
  185                 if (p->p_flag & P_SYSTEM || p->p_lock > 0)
  186                         strlcat(state, "L", sizeof(state));
  187                 if (p->p_pgrp != NULL && p->p_session != NULL &&
  188                     SESS_LEADER(p))
  189                         strlcat(state, "s", sizeof(state));
  190                 /* Cheated here and didn't compare pgid's. */
  191                 if (p->p_flag & P_CONTROLT)
  192                         strlcat(state, "+", sizeof(state));
  193                 if (cred != NULL && jailed(cred))
  194                         strlcat(state, "J", sizeof(state));
  195                 db_printf(" %-6.6s ", state);
  196                 if (p->p_flag & P_HADTHREADS) {
  197 #ifdef __LP64__
  198                         db_printf(" (threaded)                  ");
  199 #else
  200                         db_printf(" (threaded)          ");
  201 #endif
  202                         if (p->p_flag & P_SYSTEM)
  203                                 db_printf("[");
  204                         db_printf("%s", p->p_comm);
  205                         if (p->p_flag & P_SYSTEM)
  206                                 db_printf("]");
  207                         db_printf("\n");
  208                 }
  209                 FOREACH_THREAD_IN_PROC(p, td) {
  210                         dumpthread(p, td, p->p_flag & P_HADTHREADS);
  211                         if (db_pager_quit)
  212                                 break;
  213                 }
  214 
  215                 p = LIST_NEXT(p, p_list);
  216                 if (p == NULL && np > 0)
  217                         p = LIST_FIRST(&zombproc);
  218         }
  219 }
  220 
  221 static void
  222 dumpthread(volatile struct proc *p, volatile struct thread *td, int all)
  223 {
  224         char state[9], wprefix;
  225         const char *wmesg;
  226         void *wchan;
  227         
  228         if (all) {
  229                 db_printf("%6d                  ", td->td_tid);
  230                 switch (td->td_state) {
  231                 case TDS_RUNNING:
  232                         snprintf(state, sizeof(state), "Run");
  233                         break;
  234                 case TDS_RUNQ:
  235                         snprintf(state, sizeof(state), "RunQ");
  236                         break;
  237                 case TDS_CAN_RUN:
  238                         snprintf(state, sizeof(state), "CanRun");
  239                         break;
  240                 case TDS_INACTIVE:
  241                         snprintf(state, sizeof(state), "Inactv");
  242                         break;
  243                 case TDS_INHIBITED:
  244                         state[0] = '\0';
  245                         if (TD_ON_LOCK(td))
  246                                 strlcat(state, "L", sizeof(state));
  247                         if (TD_IS_SLEEPING(td)) {
  248                                 if (td->td_flags & TDF_SINTR)
  249                                         strlcat(state, "S", sizeof(state));
  250                                 else
  251                                         strlcat(state, "D", sizeof(state));
  252                         }
  253                         if (TD_IS_SWAPPED(td))
  254                                 strlcat(state, "W", sizeof(state));
  255                         if (TD_AWAITING_INTR(td))
  256                                 strlcat(state, "I", sizeof(state));
  257                         if (TD_IS_SUSPENDED(td))
  258                                 strlcat(state, "s", sizeof(state));
  259                         if (state[0] != '\0')
  260                                 break;
  261                 default:
  262                         snprintf(state, sizeof(state), "???");
  263                 }                       
  264                 db_printf(" %-6.6s ", state);
  265         }
  266         wprefix = ' ';
  267         if (TD_ON_LOCK(td)) {
  268                 wprefix = '*';
  269                 wmesg = td->td_lockname;
  270                 wchan = td->td_blocked;
  271         } else if (TD_ON_SLEEPQ(td)) {
  272                 wmesg = td->td_wmesg;
  273                 wchan = td->td_wchan;
  274         } else if (TD_IS_RUNNING(td)) {
  275                 snprintf(state, sizeof(state), "CPU %d", td->td_oncpu);
  276                 wmesg = state;
  277                 wchan = NULL;
  278         } else {
  279                 wmesg = "";
  280                 wchan = NULL;
  281         }
  282         db_printf("%c%-8.8s ", wprefix, wmesg);
  283         if (wchan == NULL)
  284 #ifdef __LP64__
  285                 db_printf("%18s ", "");
  286 #else
  287                 db_printf("%10s ", "");
  288 #endif
  289         else
  290                 db_printf("%p ", wchan);
  291         if (p->p_flag & P_SYSTEM)
  292                 db_printf("[");
  293         if (td->td_name[0] != '\0')
  294                 db_printf("%s", td->td_name);
  295         else
  296                 db_printf("%s", td->td_proc->p_comm);
  297         if (p->p_flag & P_SYSTEM)
  298                 db_printf("]");
  299         db_printf("\n");
  300 }
  301 
  302 DB_SHOW_COMMAND(thread, db_show_thread)
  303 {
  304         struct thread *td;
  305         struct lock_object *lock;
  306         bool comma;
  307         int delta;
  308 
  309         /* Determine which thread to examine. */
  310         if (have_addr)
  311                 td = db_lookup_thread(addr, false);
  312         else
  313                 td = kdb_thread;
  314         lock = (struct lock_object *)td->td_lock;
  315 
  316         db_printf("Thread %d at %p:\n", td->td_tid, td);
  317         db_printf(" proc (pid %d): %p\n", td->td_proc->p_pid, td->td_proc);
  318         if (td->td_name[0] != '\0')
  319                 db_printf(" name: %s\n", td->td_name);
  320         db_printf(" stack: %p-%p\n", (void *)td->td_kstack,
  321             (void *)(td->td_kstack + td->td_kstack_pages * PAGE_SIZE - 1));
  322         db_printf(" flags: %#x ", td->td_flags);
  323         db_printf(" pflags: %#x\n", td->td_pflags);
  324         db_printf(" state: ");
  325         switch (td->td_state) {
  326         case TDS_INACTIVE:
  327                 db_printf("INACTIVE\n");
  328                 break;
  329         case TDS_CAN_RUN:
  330                 db_printf("CAN RUN\n");
  331                 break;
  332         case TDS_RUNQ:
  333                 db_printf("RUNQ\n");
  334                 break;
  335         case TDS_RUNNING:
  336                 db_printf("RUNNING (CPU %d)\n", td->td_oncpu);
  337                 break;
  338         case TDS_INHIBITED:
  339                 db_printf("INHIBITED: {");
  340                 comma = false;
  341                 if (TD_IS_SLEEPING(td)) {
  342                         db_printf("SLEEPING");
  343                         comma = true;
  344                 }
  345                 if (TD_IS_SUSPENDED(td)) {
  346                         if (comma)
  347                                 db_printf(", ");
  348                         db_printf("SUSPENDED");
  349                         comma = true;
  350                 }
  351                 if (TD_IS_SWAPPED(td)) {
  352                         if (comma)
  353                                 db_printf(", ");
  354                         db_printf("SWAPPED");
  355                         comma = true;
  356                 }
  357                 if (TD_ON_LOCK(td)) {
  358                         if (comma)
  359                                 db_printf(", ");
  360                         db_printf("LOCK");
  361                         comma = true;
  362                 }
  363                 if (TD_AWAITING_INTR(td)) {
  364                         if (comma)
  365                                 db_printf(", ");
  366                         db_printf("IWAIT");
  367                 }
  368                 db_printf("}\n");
  369                 break;
  370         default:
  371                 db_printf("??? (%#x)\n", td->td_state);
  372                 break;
  373         }
  374         if (TD_ON_LOCK(td))
  375                 db_printf(" lock: %s  turnstile: %p\n", td->td_lockname,
  376                     td->td_blocked);
  377         if (TD_ON_SLEEPQ(td))
  378                 db_printf(" wmesg: %s  wchan: %p\n", td->td_wmesg,
  379                     td->td_wchan);
  380         db_printf(" priority: %d\n", td->td_priority);
  381         db_printf(" container lock: %s (%p)\n", lock->lo_name, lock);
  382         if (td->td_swvoltick != 0) {
  383                 delta = (u_int)ticks - (u_int)td->td_swvoltick;
  384                 db_printf(" last voluntary switch: %d ms ago\n",
  385                     1000 * delta / hz);
  386         }
  387         if (td->td_swinvoltick != 0) {
  388                 delta = (u_int)ticks - (u_int)td->td_swinvoltick;
  389                 db_printf(" last involuntary switch: %d ms ago\n",
  390                     1000 * delta / hz);
  391         }
  392 }
  393 
  394 DB_SHOW_COMMAND(proc, db_show_proc)
  395 {
  396         struct thread *td;
  397         struct proc *p;
  398         int i;
  399 
  400         /* Determine which process to examine. */
  401         if (have_addr)
  402                 p = db_lookup_proc(addr);
  403         else
  404                 p = kdb_thread->td_proc;
  405 
  406         db_printf("Process %d (%s) at %p:\n", p->p_pid, p->p_comm, p);
  407         db_printf(" state: ");
  408         switch (p->p_state) {
  409         case PRS_NEW:
  410                 db_printf("NEW\n");
  411                 break;
  412         case PRS_NORMAL:
  413                 db_printf("NORMAL\n");
  414                 break;
  415         case PRS_ZOMBIE:
  416                 db_printf("ZOMBIE\n");
  417                 break;
  418         default:
  419                 db_printf("??? (%#x)\n", p->p_state);
  420         }
  421         if (p->p_ucred != NULL) {
  422                 db_printf(" uid: %d  gids: ", p->p_ucred->cr_uid);
  423                 for (i = 0; i < p->p_ucred->cr_ngroups; i++) {
  424                         db_printf("%d", p->p_ucred->cr_groups[i]);
  425                         if (i < (p->p_ucred->cr_ngroups - 1))
  426                                 db_printf(", ");
  427                 }
  428                 db_printf("\n");
  429         }
  430         if (p->p_pptr != NULL)
  431                 db_printf(" parent: pid %d at %p\n", p->p_pptr->p_pid,
  432                     p->p_pptr);
  433         if (p->p_leader != NULL && p->p_leader != p)
  434                 db_printf(" leader: pid %d at %p\n", p->p_leader->p_pid,
  435                     p->p_leader);
  436         if (p->p_sysent != NULL)
  437                 db_printf(" ABI: %s\n", p->p_sysent->sv_name);
  438         if (p->p_args != NULL)
  439                 db_printf(" arguments: %.*s\n", (int)p->p_args->ar_length,
  440                     p->p_args->ar_args);
  441         db_printf(" threads: %d\n", p->p_numthreads);
  442         FOREACH_THREAD_IN_PROC(p, td) {
  443                 dumpthread(p, td, 1);
  444                 if (db_pager_quit)
  445                         break;
  446         }
  447 }
  448 
  449 void
  450 db_findstack_cmd(db_expr_t addr, bool have_addr, db_expr_t dummy3 __unused,
  451     char *dummy4 __unused)
  452 {
  453         struct proc *p;
  454         struct thread *td;
  455         struct kstack_cache_entry *ks_ce;
  456         vm_offset_t saddr;
  457 
  458         if (have_addr)
  459                 saddr = addr;
  460         else {
  461                 db_printf("Usage: findstack <address>\n");
  462                 return;
  463         }
  464 
  465         FOREACH_PROC_IN_SYSTEM(p) {
  466                 FOREACH_THREAD_IN_PROC(p, td) {
  467                         if (td->td_kstack <= saddr && saddr < td->td_kstack +
  468                             PAGE_SIZE * td->td_kstack_pages) {
  469                                 db_printf("Thread %p\n", td);
  470                                 return;
  471                         }
  472                 }
  473         }
  474 
  475         for (ks_ce = kstack_cache; ks_ce != NULL;
  476              ks_ce = ks_ce->next_ks_entry) {
  477                 if ((vm_offset_t)ks_ce <= saddr && saddr < (vm_offset_t)ks_ce +
  478                     PAGE_SIZE * kstack_pages) {
  479                         db_printf("Cached stack %p\n", ks_ce);
  480                         return;
  481                 }
  482         }
  483 }

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