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  * 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  *      @(#)resourcevar.h       8.4 (Berkeley) 1/9/95
   30  * $FreeBSD$
   31  */
   32 
   33 #ifndef _SYS_RESOURCEVAR_H_
   34 #define _SYS_RESOURCEVAR_H_
   35 
   36 #include <sys/resource.h>
   37 #include <sys/queue.h>
   38 #ifdef _KERNEL
   39 #include <sys/_lock.h>
   40 #include <sys/_mutex.h>
   41 #endif
   42 
   43 /*
   44  * Kernel per-process accounting / statistics
   45  * (not necessarily resident except when running).
   46  *
   47  * Locking key:
   48  *      b - created at fork, never changes
   49  *      c - locked by proc mtx
   50  *      j - locked by sched_lock mtx
   51  *      k - only accessed by curthread
   52  */
   53 struct pstats {
   54 #define pstat_startzero p_ru
   55         struct  rusage p_ru;            /* Stats for this process. */
   56         struct  rusage p_cru;           /* Stats for reaped children. */
   57         struct  itimerval p_timer[3];   /* (j) Virtual-time timers. */
   58 #define pstat_endzero   pstat_startcopy
   59 
   60 #define pstat_startcopy p_prof
   61         struct uprof {                  /* Profile arguments. */
   62                 caddr_t pr_base;        /* (c + j) Buffer base. */
   63                 u_long  pr_size;        /* (c + j) Buffer size. */
   64                 u_long  pr_off;         /* (c + j) PC offset. */
   65                 u_long  pr_scale;       /* (c + j) PC scaling. */
   66         } p_prof;
   67 #define pstat_endcopy   p_start
   68         struct  timeval p_start;        /* (b) Starting time. */
   69 };
   70 
   71 #ifdef _KERNEL
   72 
   73 /*
   74  * Kernel shareable process resource limits.  Because this structure
   75  * is moderately large but changes infrequently, it is normally
   76  * shared copy-on-write after forks.
   77  */
   78 struct plimit {
   79         struct  rlimit pl_rlimit[RLIM_NLIMITS];
   80         int     pl_refcnt;              /* number of references */
   81         struct  mtx *pl_mtx;
   82 };
   83 
   84 #define LIM_LOCK(lim)           mtx_lock((lim)->pl_mtx)
   85 #define LIM_UNLOCK(lim)         mtx_unlock((lim)->pl_mtx)
   86 #define LIM_LOCK_ASSERT(lim, f) mtx_assert((lim)->pl_mtx, (f))
   87 
   88 /*-
   89  * Per uid resource consumption
   90  *
   91  * Locking guide:
   92  * (a) Constant from inception
   93  * (b) Locked by ui_mtxp
   94  * (c) Locked by global uihashtbl_mtx
   95  */
   96 struct uidinfo {
   97         LIST_ENTRY(uidinfo) ui_hash;    /* (c) hash chain of uidinfos */
   98         rlim_t  ui_sbsize;              /* (b) socket buffer space consumed */
   99         long    ui_proccnt;             /* (b) number of processes */
  100         uid_t   ui_uid;                 /* (a) uid */
  101         u_int   ui_ref;                 /* (b) reference count */
  102         struct mtx *ui_mtxp;            /* protect all counts/limits */
  103 };
  104 
  105 #define UIDINFO_LOCK(ui)        mtx_lock((ui)->ui_mtxp)
  106 #define UIDINFO_UNLOCK(ui)      mtx_unlock((ui)->ui_mtxp)
  107 
  108 struct proc;
  109 struct thread;
  110 
  111 void     addupc_intr(struct thread *td, uintptr_t pc, u_int ticks);
  112 void     addupc_task(struct thread *td, uintptr_t pc, u_int ticks);
  113 void     calcru(struct proc *p, struct timeval *up, struct timeval *sp,
  114             struct timeval *ip);
  115 int      chgproccnt(struct uidinfo *uip, int diff, int maxval);
  116 int      chgsbsize(struct uidinfo *uip, u_int *hiwat, u_int to,
  117             rlim_t maxval);
  118 int      fuswintr(void *base);
  119 struct plimit
  120         *lim_alloc(void);
  121 void     lim_copy(struct plimit *dst, struct plimit *src);
  122 rlim_t   lim_cur(struct proc *p, int which);
  123 void     lim_free(struct plimit *limp);
  124 struct plimit
  125         *lim_hold(struct plimit *limp);
  126 rlim_t   lim_max(struct proc *p, int which);
  127 void     lim_rlimit(struct proc *p, int which, struct rlimit *rlp);
  128 void     ruadd(struct rusage *ru, struct rusage *ru2);
  129 int      suswintr(void *base, int word);
  130 struct uidinfo
  131         *uifind(uid_t uid);
  132 void     uifree(struct uidinfo *uip);
  133 void     uihashinit(void);
  134 void     uihold(struct uidinfo *uip);
  135 
  136 #endif /* _KERNEL */
  137 #endif /* !_SYS_RESOURCEVAR_H_ */

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