The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/sys/resourcevar.h

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    1 /*
    2  * Copyright (c) 1991, 1993
    3  *      The Regents of the University of California.  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  * 3. All advertising materials mentioning features or use of this software
   14  *    must display the following acknowledgement:
   15  *      This product includes software developed by the University of
   16  *      California, Berkeley and its contributors.
   17  * 4. Neither the name of the University nor the names of its contributors
   18  *    may be used to endorse or promote products derived from this software
   19  *    without specific prior written permission.
   20  *
   21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   31  * SUCH DAMAGE.
   32  *
   33  *      @(#)resourcevar.h       8.4 (Berkeley) 1/9/95
   34  * $FreeBSD: src/sys/sys/resourcevar.h,v 1.16.2.1 2000/09/07 19:13:55 truckman Exp $
   35  * $DragonFly: src/sys/sys/resourcevar.h,v 1.16 2008/05/08 01:26:01 dillon Exp $
   36  */
   37 
   38 #ifndef _SYS_RESOURCEVAR_H_
   39 #define _SYS_RESOURCEVAR_H_
   40 
   41 #ifndef _SYS_TYPES_H_
   42 #include <sys/types.h>
   43 #endif
   44 #ifndef _SYS_RESOURCE_H_
   45 #include <sys/resource.h>
   46 #endif
   47 #ifndef _SYS_QUEUE_H_
   48 #include <sys/queue.h>
   49 #endif
   50 #ifndef _SYS_VARSYM_H_
   51 #include <sys/varsym.h>
   52 #endif
   53 #ifndef _SYS_TIME_H_
   54 #include <sys/time.h>
   55 #endif
   56 #ifndef _SYS_SPINLOCK_H_
   57 #include <sys/spinlock.h>
   58 #endif
   59 
   60 struct uprof {                  /* profile arguments */
   61         caddr_t pr_base;        /* buffer base */
   62         u_long  pr_size;        /* buffer size */
   63         u_long  pr_off;         /* pc offset */
   64         u_long  pr_scale;       /* pc scaling */
   65         u_long  pr_addr;        /* temp storage for addr until AST */
   66         u_long  pr_ticks;       /* temp storage for ticks until AST */
   67 };
   68 
   69 #if defined(_KERNEL) || defined(_KERNEL_STRUCTURES)
   70 
   71 /*
   72  * For krateprintf()
   73  */
   74 struct krate {
   75         int freq;
   76         int ticks;
   77         int count;
   78 };
   79 
   80 /*
   81  * Kernel shareable process resource limits.  Because this structure
   82  * is moderately large but changes infrequently, it is normally
   83  * shared copy-on-write after forks.
   84  *
   85  * Threaded programs force p_exclusive (set it to 2) to prevent the
   86  * proc->p_limit pointer from changing out from under threaded access.
   87  */
   88 struct plimit {
   89         struct  rlimit pl_rlimit[RLIM_NLIMITS];
   90         int     p_refcnt;               /* number of references */
   91         int     p_exclusive;            /* exclusive to proc due to lwp's */
   92         rlim_t  p_cpulimit;             /* current cpu limit in usec */
   93         struct spinlock p_spin;
   94 };
   95 
   96 #define PLIMIT_TESTCPU_OK       0
   97 #define PLIMIT_TESTCPU_XCPU     1
   98 #define PLIMIT_TESTCPU_KILL     2
   99 
  100 /*
  101  * Per uid resource consumption
  102  */
  103 struct uidinfo {
  104         /*
  105          * Protects access to ui_sbsize, ui_proccnt, ui_posixlocks
  106          */
  107         struct spinlock ui_lock;
  108         LIST_ENTRY(uidinfo) ui_hash;
  109         rlim_t  ui_sbsize;              /* socket buffer space consumed */
  110         long    ui_proccnt;             /* number of processes */
  111         uid_t   ui_uid;                 /* uid */
  112         int     ui_ref;                 /* reference count */
  113         int     ui_posixlocks;          /* number of POSIX locks */
  114         int     ui_openfiles;           /* number of open files */
  115         struct varsymset ui_varsymset;  /* variant symlinks */
  116 };
  117 
  118 #endif
  119 
  120 #ifdef _KERNEL
  121 
  122 struct proc;
  123 struct lwp;
  124 
  125 void    addupc_intr (struct proc *p, u_long pc, u_int ticks);
  126 void    addupc_task (struct proc *p, u_long pc, u_int ticks);
  127 void    calcru (struct lwp *lp, struct timeval *up, struct timeval *sp);
  128 void    calcru_proc (struct proc *p, struct rusage *ru);
  129 int     chgproccnt (struct uidinfo *uip, int diff, int max);
  130 int     chgsbsize (struct uidinfo *uip, u_long *hiwat, u_long to, rlim_t max);
  131 void    ruadd (struct rusage *ru, struct rusage *ru2);
  132 struct uidinfo *uifind (uid_t uid);
  133 void    uihold (struct uidinfo *uip);
  134 void    uidrop (struct uidinfo *uip);
  135 void    uireplace (struct uidinfo **puip, struct uidinfo *nuip);
  136 void    uihashinit (void);
  137 
  138 void plimit_init0(struct plimit *);
  139 struct plimit *plimit_fork(struct proc *);
  140 void plimit_lwp_fork(struct proc *);
  141 int plimit_testcpulimit(struct plimit *, u_int64_t);
  142 void plimit_modify(struct proc *, int, struct rlimit *);
  143 void plimit_free(struct proc *);
  144 
  145 #endif
  146 
  147 #endif  /* !_SYS_RESOURCEVAR_H_ */

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