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: releng/9.0/sys/sys/resourcevar.h 224188 2011-07-18 17:33:08Z jhb $
   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 proc slock
   51  *      k - only accessed by curthread
   52  */
   53 struct pstats {
   54 #define pstat_startzero p_cru
   55         struct  rusage p_cru;           /* Stats for reaped children. */
   56         struct  itimerval p_timer[3];   /* (j) Virtual-time timers. */
   57 #define pstat_endzero   pstat_startcopy
   58 
   59 #define pstat_startcopy p_prof
   60         struct uprof {                  /* Profile arguments. */
   61                 caddr_t pr_base;        /* (c + j) Buffer base. */
   62                 u_long  pr_size;        /* (c + j) Buffer size. */
   63                 u_long  pr_off;         /* (c + j) PC offset. */
   64                 u_long  pr_scale;       /* (c + j) PC scaling. */
   65         } p_prof;
   66 #define pstat_endcopy   p_start
   67         struct  timeval p_start;        /* (b) Starting time. */
   68 };
   69 
   70 #ifdef _KERNEL
   71 
   72 /*
   73  * Kernel shareable process resource limits.  Because this structure
   74  * is moderately large but changes infrequently, it is normally
   75  * shared copy-on-write after forks.
   76  */
   77 struct plimit {
   78         struct  rlimit pl_rlimit[RLIM_NLIMITS];
   79         int     pl_refcnt;              /* number of references */
   80 };
   81 
   82 struct racct;
   83 
   84 /*-
   85  * Per uid resource consumption.  This structure is used to track
   86  * the total resource consumption (process count, socket buffer size,
   87  * etc) for the uid and impose limits.
   88  *
   89  * Locking guide:
   90  * (a) Constant from inception
   91  * (b) Lockless, updated using atomics
   92  * (c) Locked by global uihashtbl_mtx
   93  * (d) Locked by the ui_vmsize_mtx
   94  */
   95 struct uidinfo {
   96         LIST_ENTRY(uidinfo) ui_hash;    /* (c) hash chain of uidinfos */
   97         struct mtx ui_vmsize_mtx;
   98         vm_ooffset_t ui_vmsize;         /* (d) swap reservation by uid */
   99         long    ui_sbsize;              /* (b) socket buffer space consumed */
  100         long    ui_proccnt;             /* (b) number of processes */
  101         long    ui_ptscnt;              /* (b) number of pseudo-terminals */
  102         uid_t   ui_uid;                 /* (a) uid */
  103         u_int   ui_ref;                 /* (b) reference count */
  104         struct racct *ui_racct;         /* (a) resource accounting */
  105 };
  106 
  107 #define UIDINFO_VMSIZE_LOCK(ui)         mtx_lock(&((ui)->ui_vmsize_mtx))
  108 #define UIDINFO_VMSIZE_UNLOCK(ui)       mtx_unlock(&((ui)->ui_vmsize_mtx))
  109 
  110 struct proc;
  111 struct rusage_ext;
  112 struct thread;
  113 
  114 void     addupc_intr(struct thread *td, uintfptr_t pc, u_int ticks);
  115 void     addupc_task(struct thread *td, uintfptr_t pc, u_int ticks);
  116 void     calccru(struct proc *p, struct timeval *up, struct timeval *sp);
  117 void     calcru(struct proc *p, struct timeval *up, struct timeval *sp);
  118 int      chgproccnt(struct uidinfo *uip, int diff, rlim_t maxval);
  119 int      chgsbsize(struct uidinfo *uip, u_int *hiwat, u_int to,
  120             rlim_t maxval);
  121 int      chgptscnt(struct uidinfo *uip, int diff, rlim_t maxval);
  122 int      fuswintr(void *base);
  123 struct plimit
  124         *lim_alloc(void);
  125 void     lim_copy(struct plimit *dst, struct plimit *src);
  126 rlim_t   lim_cur(struct proc *p, int which);
  127 void     lim_fork(struct proc *p1, struct proc *p2);
  128 void     lim_free(struct plimit *limp);
  129 struct plimit
  130         *lim_hold(struct plimit *limp);
  131 rlim_t   lim_max(struct proc *p, int which);
  132 void     lim_rlimit(struct proc *p, int which, struct rlimit *rlp);
  133 void     ruadd(struct rusage *ru, struct rusage_ext *rux, struct rusage *ru2,
  134             struct rusage_ext *rux2);
  135 void     rucollect(struct rusage *ru, struct rusage *ru2);
  136 void     rufetch(struct proc *p, struct rusage *ru);
  137 void     rufetchcalc(struct proc *p, struct rusage *ru, struct timeval *up,
  138             struct timeval *sp);
  139 void     rufetchtd(struct thread *td, struct rusage *ru);
  140 void     ruxagg(struct proc *p, struct thread *td);
  141 int      suswintr(void *base, int word);
  142 struct uidinfo
  143         *uifind(uid_t uid);
  144 void     uifree(struct uidinfo *uip);
  145 void     uihashinit(void);
  146 void     uihold(struct uidinfo *uip);
  147 void     ui_racct_foreach(void (*callback)(struct racct *racct,
  148             void *arg2, void *arg3), void *arg2, void *arg3);
  149 
  150 #endif /* _KERNEL */
  151 #endif /* !_SYS_RESOURCEVAR_H_ */

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