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/9.0/sys/sys/vmmeter.h 217192 2011-01-09 12:50:44Z kib $
   31  */
   32 
   33 #ifndef _SYS_VMMETER_H_
   34 #define _SYS_VMMETER_H_
   35 
   36 /*
   37  * This value is used by ps(1) to change sleep state flag from 'S' to
   38  * 'I' and by the sched process to set the alarm clock.
   39  */
   40 #define MAXSLP                  20
   41 
   42 /*
   43  * System wide statistics counters.
   44  * Locking:
   45  *      a - locked by atomic operations
   46  *      c - constant after initialization
   47  *      f - locked by vm_page_queue_free_mtx
   48  *      p - locked by being in the PCPU and atomicity respect to interrupts
   49  *      q - locked by vm_page_queue_mtx
   50  */
   51 struct vmmeter {
   52         /*
   53          * General system activity.
   54          */
   55         u_int v_swtch;          /* (p) context switches */
   56         u_int v_trap;           /* (p) calls to trap */
   57         u_int v_syscall;        /* (p) calls to syscall() */
   58         u_int v_intr;           /* (p) device interrupts */
   59         u_int v_soft;           /* (p) software interrupts */
   60         /*
   61          * Virtual memory activity.
   62          */
   63         u_int v_vm_faults;      /* (p) address memory faults */
   64         u_int v_cow_faults;     /* (p) copy-on-writes faults */
   65         u_int v_cow_optim;      /* (p) optimized copy-on-writes faults */
   66         u_int v_zfod;           /* (p) pages zero filled on demand */
   67         u_int v_ozfod;          /* (p) optimized zero fill pages */
   68         u_int v_swapin;         /* (p) swap pager pageins */
   69         u_int v_swapout;        /* (p) swap pager pageouts */
   70         u_int v_swappgsin;      /* (p) swap pager pages paged in */
   71         u_int v_swappgsout;     /* (p) swap pager pages paged out */
   72         u_int v_vnodein;        /* (p) vnode pager pageins */
   73         u_int v_vnodeout;       /* (p) vnode pager pageouts */
   74         u_int v_vnodepgsin;     /* (p) vnode_pager pages paged in */
   75         u_int v_vnodepgsout;    /* (p) vnode pager pages paged out */
   76         u_int v_intrans;        /* (p) intransit blocking page faults */
   77         u_int v_reactivated;    /* (f) pages reactivated from free list */
   78         u_int v_pdwakeups;      /* (f) times daemon has awaken from sleep */
   79         u_int v_pdpages;        /* (q) pages analyzed by daemon */
   80 
   81         u_int v_tcached;        /* (p) total pages cached */
   82         u_int v_dfree;          /* (q) pages freed by daemon */
   83         u_int v_pfree;          /* (p) pages freed by exiting processes */
   84         u_int v_tfree;          /* (p) total pages freed */
   85         /*
   86          * Distribution of page usages.
   87          */
   88         u_int v_page_size;      /* (c) page size in bytes */
   89         u_int v_page_count;     /* (c) total number of pages in system */
   90         u_int v_free_reserved;  /* (c) pages reserved for deadlock */
   91         u_int v_free_target;    /* (c) pages desired free */
   92         u_int v_free_min;       /* (c) pages desired free */
   93         u_int v_free_count;     /* (f) pages free */
   94         u_int v_wire_count;     /* (a) pages wired down */
   95         u_int v_active_count;   /* (q) pages active */
   96         u_int v_inactive_target; /* (c) pages desired inactive */
   97         u_int v_inactive_count; /* (q) pages inactive */
   98         u_int v_cache_count;    /* (f) pages on cache queue */
   99         u_int v_cache_min;      /* (c) min pages desired on cache queue */
  100         u_int v_cache_max;      /* (c) max pages in cached obj */
  101         u_int v_pageout_free_min;   /* (c) min pages reserved for kernel */
  102         u_int v_interrupt_free_min; /* (c) reserved pages for int code */
  103         u_int v_free_severe;    /* (c) severe page depletion point */
  104         /*
  105          * Fork/vfork/rfork activity.
  106          */
  107         u_int v_forks;          /* (p) fork() calls */
  108         u_int v_vforks;         /* (p) vfork() calls */
  109         u_int v_rforks;         /* (p) rfork() calls */
  110         u_int v_kthreads;       /* (p) fork() calls by kernel */
  111         u_int v_forkpages;      /* (p) VM pages affected by fork() */
  112         u_int v_vforkpages;     /* (p) VM pages affected by vfork() */
  113         u_int v_rforkpages;     /* (p) VM pages affected by rfork() */
  114         u_int v_kthreadpages;   /* (p) VM pages affected by fork() by kernel */
  115 };
  116 #ifdef _KERNEL
  117 
  118 extern struct vmmeter cnt;
  119 
  120 /*
  121  * Return TRUE if we are under our severe low-free-pages threshold
  122  *
  123  * This routine is typically used at the user<->system interface to determine
  124  * whether we need to block in order to avoid a low memory deadlock.
  125  */
  126 
  127 static __inline 
  128 int
  129 vm_page_count_severe(void)
  130 {
  131     return (cnt.v_free_severe > (cnt.v_free_count + cnt.v_cache_count));
  132 }
  133 
  134 /*
  135  * Return TRUE if we are under our minimum low-free-pages threshold.
  136  *
  137  * This routine is typically used within the system to determine whether
  138  * we can execute potentially very expensive code in terms of memory.  It
  139  * is also used by the pageout daemon to calculate when to sleep, when
  140  * to wake waiters up, and when (after making a pass) to become more
  141  * desparate.
  142  */
  143 
  144 static __inline 
  145 int
  146 vm_page_count_min(void)
  147 {
  148     return (cnt.v_free_min > (cnt.v_free_count + cnt.v_cache_count));
  149 }
  150 
  151 /*
  152  * Return TRUE if we have not reached our free page target during
  153  * free page recovery operations.
  154  */
  155 
  156 static __inline 
  157 int
  158 vm_page_count_target(void)
  159 {
  160     return (cnt.v_free_target > (cnt.v_free_count + cnt.v_cache_count));
  161 }
  162 
  163 /*
  164  * Return the number of pages we need to free-up or cache
  165  * A positive number indicates that we do not have enough free pages.
  166  */
  167 
  168 static __inline 
  169 int
  170 vm_paging_target(void)
  171 {
  172     return (
  173         (cnt.v_free_target + cnt.v_cache_min) -
  174         (cnt.v_free_count + cnt.v_cache_count)
  175     );
  176 }
  177 
  178 /*
  179  * Returns TRUE if the pagedaemon needs to be woken up.
  180  */
  181 
  182 static __inline 
  183 int
  184 vm_paging_needed(void)
  185 {
  186     return (
  187         (cnt.v_free_reserved + cnt.v_cache_min) >
  188         (cnt.v_free_count + cnt.v_cache_count)
  189     );
  190 }
  191 
  192 #endif
  193 
  194 /* systemwide totals computed every five seconds */
  195 struct vmtotal {
  196         int16_t t_rq;           /* length of the run queue */
  197         int16_t t_dw;           /* jobs in ``disk wait'' (neg priority) */
  198         int16_t t_pw;           /* jobs in page wait */
  199         int16_t t_sl;           /* jobs sleeping in core */
  200         int16_t t_sw;           /* swapped out runnable/short block jobs */
  201         int32_t t_vm;           /* total virtual memory */
  202         int32_t t_avm;          /* active virtual memory */
  203         int32_t t_rm;           /* total real memory in use */
  204         int32_t t_arm;          /* active real memory */
  205         int32_t t_vmshr;        /* shared virtual memory */
  206         int32_t t_avmshr;       /* active shared virtual memory */
  207         int32_t t_rmshr;        /* shared real memory */
  208         int32_t t_armshr;       /* active shared real memory */
  209         int32_t t_free;         /* free memory pages */
  210 };
  211 
  212 #endif

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