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/vmmeter.h

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    1 /*-
    2  * Copyright (c) 1982, 1986, 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  *      @(#)vmmeter.h   8.2 (Berkeley) 7/10/94
   30  * $FreeBSD: releng/8.1/sys/sys/vmmeter.h 199583 2009-11-20 15:27:52Z jhb $
   31  */
   32 
   33 #ifndef _SYS_VMMETER_H_
   34 #define _SYS_VMMETER_H_
   35 
   36 /*
   37  * System wide statistics counters.
   38  * Locking:
   39  *      a - locked by atomic operations
   40  *      c - constant after initialization
   41  *      f - locked by vm_page_queue_free_mtx
   42  *      p - locked by being in the PCPU and atomicity respect to interrupts
   43  *      q - locked by vm_page_queue_mtx
   44  */
   45 struct vmmeter {
   46         /*
   47          * General system activity.
   48          */
   49         u_int v_swtch;          /* (p) context switches */
   50         u_int v_trap;           /* (p) calls to trap */
   51         u_int v_syscall;        /* (p) calls to syscall() */
   52         u_int v_intr;           /* (p) device interrupts */
   53         u_int v_soft;           /* (p) software interrupts */
   54         /*
   55          * Virtual memory activity.
   56          */
   57         u_int v_vm_faults;      /* (p) address memory faults */
   58         u_int v_cow_faults;     /* (p) copy-on-writes faults */
   59         u_int v_cow_optim;      /* (p) optimized copy-on-writes faults */
   60         u_int v_zfod;           /* (p) pages zero filled on demand */
   61         u_int v_ozfod;          /* (p) optimized zero fill pages */
   62         u_int v_swapin;         /* (p) swap pager pageins */
   63         u_int v_swapout;        /* (p) swap pager pageouts */
   64         u_int v_swappgsin;      /* (p) swap pager pages paged in */
   65         u_int v_swappgsout;     /* (p) swap pager pages paged out */
   66         u_int v_vnodein;        /* (p) vnode pager pageins */
   67         u_int v_vnodeout;       /* (p) vnode pager pageouts */
   68         u_int v_vnodepgsin;     /* (p) vnode_pager pages paged in */
   69         u_int v_vnodepgsout;    /* (p) vnode pager pages paged out */
   70         u_int v_intrans;        /* (p) intransit blocking page faults */
   71         u_int v_reactivated;    /* (f) pages reactivated from free list */
   72         u_int v_pdwakeups;      /* (f) times daemon has awaken from sleep */
   73         u_int v_pdpages;        /* (q) pages analyzed by daemon */
   74 
   75         u_int v_tcached;        /* (q) total pages cached */
   76         u_int v_dfree;          /* (q) pages freed by daemon */
   77         u_int v_pfree;          /* (q) pages freed by exiting processes */
   78         u_int v_tfree;          /* (p) total pages freed */
   79         /*
   80          * Distribution of page usages.
   81          */
   82         u_int v_page_size;      /* (c) page size in bytes */
   83         u_int v_page_count;     /* (c) total number of pages in system */
   84         u_int v_free_reserved;  /* (c) pages reserved for deadlock */
   85         u_int v_free_target;    /* (c) pages desired free */
   86         u_int v_free_min;       /* (c) pages desired free */
   87         u_int v_free_count;     /* (f) pages free */
   88         u_int v_wire_count;     /* (a) pages wired down */
   89         u_int v_active_count;   /* (q) pages active */
   90         u_int v_inactive_target; /* (c) pages desired inactive */
   91         u_int v_inactive_count; /* (q) pages inactive */
   92         u_int v_cache_count;    /* (f) pages on cache queue */
   93         u_int v_cache_min;      /* (c) min pages desired on cache queue */
   94         u_int v_cache_max;      /* (c) max pages in cached obj */
   95         u_int v_pageout_free_min;   /* (c) min pages reserved for kernel */
   96         u_int v_interrupt_free_min; /* (c) reserved pages for int code */
   97         u_int v_free_severe;    /* (c) severe page depletion point */
   98         /*
   99          * Fork/vfork/rfork activity.
  100          */
  101         u_int v_forks;          /* (p) fork() calls */
  102         u_int v_vforks;         /* (p) vfork() calls */
  103         u_int v_rforks;         /* (p) rfork() calls */
  104         u_int v_kthreads;       /* (p) fork() calls by kernel */
  105         u_int v_forkpages;      /* (p) VM pages affected by fork() */
  106         u_int v_vforkpages;     /* (p) VM pages affected by vfork() */
  107         u_int v_rforkpages;     /* (p) VM pages affected by rfork() */
  108         u_int v_kthreadpages;   /* (p) VM pages affected by fork() by kernel */
  109 };
  110 #ifdef _KERNEL
  111 
  112 extern struct vmmeter cnt;
  113 
  114 /*
  115  * Return TRUE if we are under our severe low-free-pages threshold
  116  *
  117  * This routine is typically used at the user<->system interface to determine
  118  * whether we need to block in order to avoid a low memory deadlock.
  119  */
  120 
  121 static __inline 
  122 int
  123 vm_page_count_severe(void)
  124 {
  125     return (cnt.v_free_severe > (cnt.v_free_count + cnt.v_cache_count));
  126 }
  127 
  128 /*
  129  * Return TRUE if we are under our minimum low-free-pages threshold.
  130  *
  131  * This routine is typically used within the system to determine whether
  132  * we can execute potentially very expensive code in terms of memory.  It
  133  * is also used by the pageout daemon to calculate when to sleep, when
  134  * to wake waiters up, and when (after making a pass) to become more
  135  * desparate.
  136  */
  137 
  138 static __inline 
  139 int
  140 vm_page_count_min(void)
  141 {
  142     return (cnt.v_free_min > (cnt.v_free_count + cnt.v_cache_count));
  143 }
  144 
  145 /*
  146  * Return TRUE if we have not reached our free page target during
  147  * free page recovery operations.
  148  */
  149 
  150 static __inline 
  151 int
  152 vm_page_count_target(void)
  153 {
  154     return (cnt.v_free_target > (cnt.v_free_count + cnt.v_cache_count));
  155 }
  156 
  157 /*
  158  * Return the number of pages we need to free-up or cache
  159  * A positive number indicates that we do not have enough free pages.
  160  */
  161 
  162 static __inline 
  163 int
  164 vm_paging_target(void)
  165 {
  166     return (
  167         (cnt.v_free_target + cnt.v_cache_min) -
  168         (cnt.v_free_count + cnt.v_cache_count)
  169     );
  170 }
  171 
  172 /*
  173  * Returns TRUE if the pagedaemon needs to be woken up.
  174  */
  175 
  176 static __inline 
  177 int
  178 vm_paging_needed(void)
  179 {
  180     return (
  181         (cnt.v_free_reserved + cnt.v_cache_min) >
  182         (cnt.v_free_count + cnt.v_cache_count)
  183     );
  184 }
  185 
  186 #endif
  187 
  188 /* systemwide totals computed every five seconds */
  189 struct vmtotal {
  190         int16_t t_rq;           /* length of the run queue */
  191         int16_t t_dw;           /* jobs in ``disk wait'' (neg priority) */
  192         int16_t t_pw;           /* jobs in page wait */
  193         int16_t t_sl;           /* jobs sleeping in core */
  194         int16_t t_sw;           /* swapped out runnable/short block jobs */
  195         int32_t t_vm;           /* total virtual memory */
  196         int32_t t_avm;          /* active virtual memory */
  197         int32_t t_rm;           /* total real memory in use */
  198         int32_t t_arm;          /* active real memory */
  199         int32_t t_vmshr;        /* shared virtual memory */
  200         int32_t t_avmshr;       /* active shared virtual memory */
  201         int32_t t_rmshr;        /* shared real memory */
  202         int32_t t_armshr;       /* active shared real memory */
  203         int32_t t_free;         /* free memory pages */
  204 };
  205 
  206 #endif

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