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

     /*-
      * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
      *
      * Copyright (c) 2010 The FreeBSD Foundation
      *
      * This software was developed by Edward Tomasz Napierala under sponsorship
      * from the FreeBSD Foundation.
      *
      * Redistribution and use in source and binary forms, with or without
     * modification, are permitted provided that the following conditions
     * are met:
     * 1. Redistributions of source code must retain the above copyright
     *    notice, this list of conditions and the following disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     *
     * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
     * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
     * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     * SUCH DAMAGE.
     *
     * $FreeBSD$
     */
    
    /*
     * Resource accounting.
     */
    
    #ifndef _RACCT_H_
    #define _RACCT_H_
    
    #include <sys/cdefs.h>
    #include <sys/types.h>
    #include <sys/queue.h>
    #include <sys/stdint.h>
    #include <sys/sysctl.h>
    
    struct buf;
    struct proc;
    struct rctl_rule_link;
    struct ucred;
    
    /*
     * Resources.
     */
    #define RACCT_UNDEFINED         -1
    #define RACCT_CPU               0
    #define RACCT_DATA              1
    #define RACCT_STACK             2
    #define RACCT_CORE              3
    #define RACCT_RSS               4
    #define RACCT_MEMLOCK           5
    #define RACCT_NPROC             6
    #define RACCT_NOFILE            7
    #define RACCT_VMEM              8
    #define RACCT_NPTS              9
    #define RACCT_SWAP              10
    #define RACCT_NTHR              11
    #define RACCT_MSGQQUEUED        12
    #define RACCT_MSGQSIZE          13
    #define RACCT_NMSGQ             14
    #define RACCT_NSEM              15
    #define RACCT_NSEMOP            16
    #define RACCT_NSHM              17
    #define RACCT_SHMSIZE           18
    #define RACCT_WALLCLOCK         19
    #define RACCT_PCTCPU            20
    #define RACCT_READBPS           21
    #define RACCT_WRITEBPS          22
    #define RACCT_READIOPS          23
    #define RACCT_WRITEIOPS         24
    #define RACCT_MAX               RACCT_WRITEIOPS
    
    /*
     * Resource properties.
     */
    #define RACCT_IN_MILLIONS       0x01
    #define RACCT_RECLAIMABLE       0x02
    #define RACCT_INHERITABLE       0x04
    #define RACCT_DENIABLE          0x08
    #define RACCT_SLOPPY            0x10
    #define RACCT_DECAYING          0x20
    
    extern int racct_types[];
    extern bool racct_enable;
    
    #define ASSERT_RACCT_ENABLED()  KASSERT(racct_enable, \
                                        ("%s called with !racct_enable", __func__))
    
    /*
     * Amount stored in c_resources[] is 10**6 times bigger than what's
    * visible to the userland.  It gets fixed up when retrieving resource
    * usage or adding rules.
    */
   #define RACCT_IS_IN_MILLIONS(X) \
       ((X) != RACCT_UNDEFINED && (racct_types[(X)] & RACCT_IN_MILLIONS) != 0)
   
   /*
    * Resource usage can drop, as opposed to only grow.  When the process
    * terminates, its resource usage is subtracted from the respective
    * per-credential racct containers.
    */
   #define RACCT_IS_RECLAIMABLE(X) (racct_types[X] & RACCT_RECLAIMABLE)
   
   /*
    * Children inherit resource usage.
    */
   #define RACCT_IS_INHERITABLE(X) (racct_types[X] & RACCT_INHERITABLE)
   
   /*
    * racct_{add,set}(9) can actually return an error and not update resource
    * usage counters.  Note that even when resource is not deniable, allocating
    * resource might cause signals to be sent by RCTL code.
    */
   #define RACCT_IS_DENIABLE(X)            (racct_types[X] & RACCT_DENIABLE)
   
   /*
    * Per-process resource usage information makes no sense, but per-credential
    * one does.  This kind of resources are usually allocated for process, but
    * freed using credentials.
    */
   #define RACCT_IS_SLOPPY(X)              (racct_types[X] & RACCT_SLOPPY)
   
   /*
    * When a process terminates, its resource usage is not automatically
    * subtracted from per-credential racct containers.  Instead, the resource
    * usage of per-credential racct containers decays in time.
    * Resource usage can also drop for such resource.
    */
   #define RACCT_IS_DECAYING(X)            (racct_types[X] & RACCT_DECAYING)
   
   /*
    * Resource usage can drop, as opposed to only grow.
    */
   #define RACCT_CAN_DROP(X)               (RACCT_IS_RECLAIMABLE(X) | RACCT_IS_DECAYING(X))
   
   /*
    * The 'racct' structure defines resource consumption for a particular
    * subject, such as process or jail.
    *
    * This structure must be filled with zeroes initially.
    */
   struct racct {
           int64_t                         r_resources[RACCT_MAX + 1];
           LIST_HEAD(, rctl_rule_link)     r_rule_links;
   };
   
   SYSCTL_DECL(_kern_racct);
   
   #ifdef RACCT
   
   extern struct mtx racct_lock;
   
   #define RACCT_LOCK()            mtx_lock(&racct_lock)
   #define RACCT_UNLOCK()          mtx_unlock(&racct_lock)
   #define RACCT_LOCK_ASSERT()     mtx_assert(&racct_lock, MA_OWNED)
   
   #define RACCT_ENABLED()         __predict_false(racct_enable)
   
   #define RACCT_PROC_LOCK(p)      do {            \
           if (RACCT_ENABLED())                    \
                   PROC_LOCK(p);                   \
   } while (0)
   #define RACCT_PROC_UNLOCK(p)    do {            \
           if (RACCT_ENABLED())                    \
                   PROC_UNLOCK(p);                 \
   } while (0)
   
   int     racct_add(struct proc *p, int resource, uint64_t amount);
   void    racct_add_cred(struct ucred *cred, int resource, uint64_t amount);
   void    racct_add_force(struct proc *p, int resource, uint64_t amount);
   void    racct_add_buf(struct proc *p, const struct buf *bufp, int is_write);
   int     racct_set(struct proc *p, int resource, uint64_t amount);
   int     racct_set_unlocked(struct proc *p, int resource, uint64_t amount);
   void    racct_set_force(struct proc *p, int resource, uint64_t amount);
   void    racct_sub(struct proc *p, int resource, uint64_t amount);
   void    racct_sub_cred(struct ucred *cred, int resource, uint64_t amount);
   uint64_t        racct_get_limit(struct proc *p, int resource);
   uint64_t        racct_get_available(struct proc *p, int resource);
   
   void    racct_create(struct racct **racctp);
   void    racct_destroy(struct racct **racctp);
   
   int     racct_proc_fork(struct proc *parent, struct proc *child);
   void    racct_proc_fork_done(struct proc *child);
   void    racct_proc_exit(struct proc *p);
   
   void    racct_proc_ucred_changed(struct proc *p, struct ucred *oldcred,
               struct ucred *newcred);
   void    racct_move(struct racct *dest, struct racct *src);
   void    racct_proc_throttle(struct proc *p, int timeout);
   
   #else
   
   #define RACCT_PROC_LOCK(p)      do { } while (0)
   #define RACCT_PROC_UNLOCK(p)    do { } while (0)
   
   static inline int
   racct_add(struct proc *p, int resource, uint64_t amount)
   {
   
           return (0);
   }
   
   static inline void
   racct_add_cred(struct ucred *cred, int resource, uint64_t amount)
   {
   }
   
   static inline void
   racct_add_force(struct proc *p, int resource, uint64_t amount)
   {
   }
   
   static inline int
   racct_set(struct proc *p, int resource, uint64_t amount)
   {
   
           return (0);
   }
   
   static inline void
   racct_set_force(struct proc *p, int resource, uint64_t amount)
   {
   }
   
   static inline void
   racct_sub(struct proc *p, int resource, uint64_t amount)
   {
   }
   
   static inline void
   racct_sub_cred(struct ucred *cred, int resource, uint64_t amount)
   {
   }
   
   static inline uint64_t
   racct_get_limit(struct proc *p, int resource)
   {
   
           return (UINT64_MAX);
   }
   
   static inline uint64_t
   racct_get_available(struct proc *p, int resource)
   {
   
           return (UINT64_MAX);
   }
   
   #define racct_create(x)
   #define racct_destroy(x)
   
   static inline int
   racct_proc_fork(struct proc *parent, struct proc *child)
   {
   
           return (0);
   }
   
   static inline void
   racct_proc_fork_done(struct proc *child)
   {
   }
   
   static inline void
   racct_proc_exit(struct proc *p)
   {
   }
   
   #endif
   
   #endif /* !_RACCT_H_ */

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