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

     /*-
      * Copyright (c) 1982, 1986, 1993
      *      The Regents of the University of California.  All rights reserved.
      *
      * 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.
     * 3. All advertising materials mentioning features or use of this software
     *    must display the following acknowledgement:
     *      This product includes software developed by the University of
     *      California, Berkeley and its contributors.
     * 4. Neither the name of the University nor the names of its contributors
     *    may be used to endorse or promote products derived from this software
     *    without specific prior written permission.
     *
     * THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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.
     *
     *      @(#)vmmeter.h   8.2 (Berkeley) 7/10/94
     * $FreeBSD$
     */
    
    #ifndef _SYS_VMMETER_H_
    #define _SYS_VMMETER_H_
    
    /*
     * System wide statistics counters.
     */
    struct vmmeter {
            /*
             * General system activity.
             */
            u_int v_swtch;          /* context switches */
            u_int v_trap;           /* calls to trap */
            u_int v_syscall;        /* calls to syscall() */
            u_int v_intr;           /* device interrupts */
            u_int v_soft;           /* software interrupts */
            /*
             * Virtual memory activity.
             */
            u_int v_vm_faults;      /* number of address memory faults */
            u_int v_cow_faults;     /* number of copy-on-writes */
            u_int v_cow_optim;      /* number of optimized copy-on-writes */
            u_int v_zfod;           /* pages zero filled on demand */
            u_int v_ozfod;          /* optimized zero fill pages */
            u_int v_swapin;         /* swap pager pageins */
            u_int v_swapout;        /* swap pager pageouts */
            u_int v_swappgsin;      /* swap pager pages paged in */
            u_int v_swappgsout;     /* swap pager pages paged out */
            u_int v_vnodein;        /* vnode pager pageins */
            u_int v_vnodeout;       /* vnode pager pageouts */
            u_int v_vnodepgsin;     /* vnode_pager pages paged in */
            u_int v_vnodepgsout;    /* vnode pager pages paged out */
            u_int v_intrans;        /* intransit blocking page faults */
            u_int v_reactivated;    /* number of pages reactivated from free list */
            u_int v_pdwakeups;      /* number of times daemon has awaken from sleep */
            u_int v_pdpages;        /* number of pages analyzed by daemon */
    
            u_int v_dfree;          /* pages freed by daemon */
            u_int v_pfree;          /* pages freed by exiting processes */
            u_int v_tfree;          /* total pages freed */
            /*
             * Distribution of page usages.
             */
            u_int v_page_size;      /* page size in bytes */
            u_int v_page_count;     /* total number of pages in system */
            u_int v_free_reserved;  /* number of pages reserved for deadlock */
            u_int v_free_target;    /* number of pages desired free */
            u_int v_free_min;       /* minimum number of pages desired free */
            u_int v_free_count;     /* number of pages free */
            u_int v_wire_count;     /* number of pages wired down */
            u_int v_active_count;   /* number of pages active */
            u_int v_inactive_target; /* number of pages desired inactive */
            u_int v_inactive_count; /* number of pages inactive */
            u_int v_cache_count;    /* number of pages on buffer cache queue */
            u_int v_cache_min;      /* min number of pages desired on cache queue */
            u_int v_cache_max;      /* max number of pages in cached obj */
            u_int v_pageout_free_min;   /* min number pages reserved for kernel */
            u_int v_interrupt_free_min; /* reserved number of pages for int code */
            u_int v_free_severe;    /* severe depletion of pages below this pt */
            /*
             * Fork/vfork/rfork activity.
             */
            u_int v_forks;          /* number of fork() calls */
            u_int v_vforks;         /* number of vfork() calls */
           u_int v_rforks;         /* number of rfork() calls */
           u_int v_kthreads;       /* number of fork() calls by kernel */
           u_int v_forkpages;      /* number of VM pages affected by fork() */
           u_int v_vforkpages;     /* number of VM pages affected by vfork() */
           u_int v_rforkpages;     /* number of VM pages affected by rfork() */
           u_int v_kthreadpages;   /* number of VM pages affected by fork() by kernel */
           u_int v_intrans_coll;   /* intransit map collisions (total) */
           u_int v_intrans_wait;   /* intransit map collisions which blocked */
   };
   #ifdef _KERNEL
   
   extern struct vmmeter cnt;
   
   /*
    * Return TRUE if we are under our reserved low-free-pages threshold
    */
   
   static __inline 
   int
   vm_page_count_reserved(void)
   {
       return (cnt.v_free_reserved > (cnt.v_free_count + cnt.v_cache_count));
   }
   
   /*
    * Return TRUE if we are under our severe low-free-pages threshold
    *
    * This routine is typically used at the user<->system interface to determine
    * whether we need to block in order to avoid a low memory deadlock.
    */
   
   static __inline 
   int
   vm_page_count_severe(void)
   {
       return (cnt.v_free_severe > (cnt.v_free_count + cnt.v_cache_count));
   }
   
   /*
    * Return TRUE if we are under our minimum low-free-pages threshold.
    *
    * This routine is typically used within the system to determine whether
    * we can execute potentially very expensive code in terms of memory.  It
    * is also used by the pageout daemon to calculate when to sleep, when
    * to wake waiters up, and when (after making a pass) to become more
    * desparate.
    */
   
   static __inline 
   int
   vm_page_count_min(void)
   {
       return (cnt.v_free_min > (cnt.v_free_count + cnt.v_cache_count));
   }
   
   /*
    * Return TRUE if we have not reached our free page target during
    * free page recovery operations.
    */
   
   static __inline 
   int
   vm_page_count_target(void)
   {
       return (cnt.v_free_target > (cnt.v_free_count + cnt.v_cache_count));
   }
   
   /*
    * Return the number of pages we need to free-up or cache
    * A positive number indicates that we do not have enough free pages.
    */
   
   static __inline 
   int
   vm_paging_target(void)
   {
       return (
           (cnt.v_free_target + cnt.v_cache_min) - 
           (cnt.v_free_count + cnt.v_cache_count)
       );
   }
   
   /*
    * Return a positive number if the pagedaemon needs to be woken up.
    */
   
   static __inline 
   int
   vm_paging_needed(void)
   {
       return (
           (cnt.v_free_reserved + cnt.v_cache_min) >
           (cnt.v_free_count + cnt.v_cache_count)
       );
   }
   
   #endif
   
   /* systemwide totals computed every five seconds */
   struct vmtotal
   {
           int16_t t_rq;           /* length of the run queue */
           int16_t t_dw;           /* jobs in ``disk wait'' (neg priority) */
           int16_t t_pw;           /* jobs in page wait */
           int16_t t_sl;           /* jobs sleeping in core */
           int16_t t_sw;           /* swapped out runnable/short block jobs */
           int32_t t_vm;           /* total virtual memory */
           int32_t t_avm;          /* active virtual memory */
           int32_t t_rm;           /* total real memory in use */
           int32_t t_arm;          /* active real memory */
           int32_t t_vmshr;        /* shared virtual memory */
           int32_t t_avmshr;       /* active shared virtual memory */
           int32_t t_rmshr;        /* shared real memory */
           int32_t t_armshr;       /* active shared real memory */
           int32_t t_free;         /* free memory pages */
   };
   
   /*
    * Optional instrumentation.
    */
   #ifdef PGINPROF
   
   #define NDMON   128
   #define NSMON   128
   
   #define DRES    20
   #define SRES    5
   
   #define PMONMIN 20
   #define PRES    50
   #define NPMON   64
   
   #define RMONMIN 130
   #define RRES    5
   #define NRMON   64
   
   /* data and stack size distribution counters */
   u_int   dmon[NDMON+1];
   u_int   smon[NSMON+1];
   
   /* page in time distribution counters */
   u_int   pmon[NPMON+2];
   
   /* reclaim time distribution counters */
   u_int   rmon[NRMON+2];
   
   int     pmonmin;
   int     pres;
   int     rmonmin;
   int     rres;
   
   u_int rectime;          /* accumulator for reclaim times */
   u_int pgintime;         /* accumulator for page in times */
   #endif
   
   #endif

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