sys/sys/resourcevar.h

   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. 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: src/sys/sys/resourcevar.h,v 1.16.2.1 2000/09/07 19:13:55 truckman Exp $
  31  * $DragonFly: src/sys/sys/resourcevar.h,v 1.16 2008/05/08 01:26:01 dillon Exp $
  32  */
  33
  34 #ifndef _SYS_RESOURCEVAR_H_
  35 #define _SYS_RESOURCEVAR_H_
  36
  37 #ifndef _SYS_TYPES_H_
  38 #include <sys/types.h>
  39 #endif
  40 #ifndef _SYS_RESOURCE_H_
  41 #include <sys/resource.h>
  42 #endif
  43 #ifndef _SYS_QUEUE_H_
  44 #include <sys/queue.h>
  45 #endif
  46 #ifndef _SYS_VARSYM_H_
  47 #include <sys/varsym.h>
  48 #endif
  49 #ifndef _SYS_TIME_H_
  50 #include <sys/time.h>
  51 #endif
  52 #ifndef _SYS_SPINLOCK_H_
  53 #include <sys/spinlock.h>
  54 #endif
  55
  56 struct uprof {                  /* profile arguments */
  57         caddr_t pr_base;        /* buffer base */
  58         u_long  pr_size;        /* buffer size */
  59         u_long  pr_off;         /* pc offset */
  60         u_long  pr_scale;       /* pc scaling */
  61         u_long  pr_addr;        /* temp storage for addr until AST */
  62         u_long  pr_ticks;       /* temp storage for ticks until AST */
  63 };
  64
  65 #if defined(_KERNEL) || defined(_KERNEL_STRUCTURES)
  66
  67 /*
  68  * For krateprintf()
  69  */
  70 struct krate {
  71         int freq;
  72         int ticks;
  73         int count;
  74 };
  75
  76 /*
  77  * Kernel shareable process resource limits.  Because this structure
  78  * is moderately large but changes infrequently, it is normally
  79  * shared copy-on-write after forks.
  80  *
  81  * Threaded programs cache p_limit in the thread structure, allowing
  82  * lockless read access.
  83  *
  84  * p_refcnt can change often, don't force cache mastership changes for
  85  * the rest of the (usually read only) data structure.  Place p_refcnt
  86  * in its own cache line.  The rest of the structure is stable as long
  87  * as the caller has a ref.
  88  */
  89 struct plimit {
  90         struct  rlimit pl_rlimit[RLIM_NLIMITS];
  91         rlim_t  p_cpulimit;             /* current cpu limit in usec */
  92         struct {
  93                 struct spinlock p_spin; /* protect modifications */
  94                 uint32_t p_refcnt;      /* refs & exclusivity */
  95         } __cachealign;
  96 } __cachealign;
  97
  98 #define PLIMITF_EXCLUSIVE       0x80000000U
  99 #define PLIMITF_MASK            0x7FFFFFFFU
 100
 101 #define PLIMIT_TESTCPU_OK       0
 102 #define PLIMIT_TESTCPU_XCPU     1
 103 #define PLIMIT_TESTCPU_KILL     2
 104
 105 /*
 106  * Per-cpu tracking structure attached to uidinfo.  These counts are only
 107  * synchronized with the uidinfo rollup fields at +/-32.  Resource limits
 108  * only check against the ui_posixlocks and ui_openfiles so some slop
 109  * is possible (checking against the pcpu structures would be cause cache
 110  * line ping-ponging)
 111  */
 112 struct uidcount {
 113         int     pu_posixlocks;
 114         int     pu_openfiles;
 115 } __cachealign;
 116
 117 #define PUP_LIMIT       32      /* +/-32 rollup */
 118
 119 /*
 120  * Per uid resource consumption
 121  */
 122 struct uidinfo {
 123         /*
 124          * Protects access to ui_sbsize, ui_proccnt, ui_posixlocks
 125          */
 126         struct spinlock ui_lock;        /* not currently used (FUTURE) */
 127         LIST_ENTRY(uidinfo) ui_hash;
 128         rlim_t  ui_sbsize;              /* socket buffer space consumed */
 129         long    ui_proccnt;             /* number of processes */
 130         uid_t   ui_uid;                 /* uid */
 131         int     ui_ref;                 /* reference count */
 132         int     ui_posixlocks;          /* (rollup) number of POSIX locks */
 133         int     ui_openfiles;           /* (rollup) number of open files */
 134         struct varsymset ui_varsymset;  /* variant symlinks */
 135         struct uidcount *ui_pcpu;
 136 };
 137
 138 #endif
 139
 140 #ifdef _KERNEL
 141
 142 struct proc;
 143 struct lwp;
 144
 145 void    addupc_intr (struct proc *p, u_long pc, u_int ticks);
 146 void    addupc_task (struct proc *p, u_long pc, u_int ticks);
 147 void    calcru (struct lwp *lp, struct timeval *up, struct timeval *sp);
 148 void    calcru_proc (struct proc *p, struct rusage *ru);
 149 int     chgproccnt (struct uidinfo *uip, int diff, int max);
 150 int     chgsbsize (struct uidinfo *uip, u_long *hiwat, u_long to, rlim_t max);
 151 void    ruadd (struct rusage *ru, struct rusage *ru2);
 152 struct uidinfo *uifind (uid_t uid);
 153 struct uidinfo *uicreate(uid_t uid);
 154 void    uihold (struct uidinfo *uip);
 155 void    uidrop (struct uidinfo *uip);
 156 void    uireplace (struct uidinfo **puip, struct uidinfo *nuip);
 157 void    uihashinit (void);
 158
 159 void plimit_init0(struct plimit *);
 160 struct plimit *plimit_fork(struct proc *);
 161 u_int64_t plimit_getadjvalue(int i);
 162 void plimit_lwp_fork(struct proc *);
 163 int plimit_testcpulimit(struct proc *, u_int64_t);
 164 void plimit_modify(struct proc *, int, struct rlimit *);
 165 void plimit_free(struct plimit *);
 166
 167 #endif
 168
 169 #endif  /* !_SYS_RESOURCEVAR_H_ */