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  * 3. All advertising materials mentioning features or use of this software
   14  *    must display the following acknowledgement:
   15  *      This product includes software developed by the University of
   16  *      California, Berkeley and its contributors.
   17  * 4. Neither the name of the University nor the names of its contributors
   18  *    may be used to endorse or promote products derived from this software
   19  *    without specific prior written permission.
   20  *
   21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   31  * SUCH DAMAGE.
   32  *
   33  *      @(#)vmmeter.h   8.2 (Berkeley) 7/10/94
   34  * $FreeBSD: src/sys/sys/vmmeter.h,v 1.24 2003/02/02 07:16:39 alc Exp $
   35  */
   36 
   37 #ifndef _SYS_VMMETER_H_
   38 #define _SYS_VMMETER_H_
   39 
   40 /*
   41  * System wide statistics counters.
   42  */
   43 struct vmmeter {
   44         /*
   45          * General system activity.
   46          */
   47         u_int v_swtch;          /* context switches */
   48         u_int v_trap;           /* calls to trap */
   49         u_int v_syscall;        /* calls to syscall() */
   50         u_int v_intr;           /* device interrupts */
   51         u_int v_soft;           /* software interrupts */
   52         /*
   53          * Virtual memory activity.
   54          */
   55         u_int v_vm_faults;      /* number of address memory faults */
   56         u_int v_cow_faults;     /* number of copy-on-writes */
   57         u_int v_cow_optim;      /* number of optimized copy-on-writes */
   58         u_int v_zfod;           /* pages zero filled on demand */
   59         u_int v_ozfod;          /* optimized zero fill pages */
   60         u_int v_swapin;         /* swap pager pageins */
   61         u_int v_swapout;        /* swap pager pageouts */
   62         u_int v_swappgsin;      /* swap pager pages paged in */
   63         u_int v_swappgsout;     /* swap pager pages paged out */
   64         u_int v_vnodein;        /* vnode pager pageins */
   65         u_int v_vnodeout;       /* vnode pager pageouts */
   66         u_int v_vnodepgsin;     /* vnode_pager pages paged in */
   67         u_int v_vnodepgsout;    /* vnode pager pages paged out */
   68         u_int v_intrans;        /* intransit blocking page faults */
   69         u_int v_reactivated;    /* number of pages reactivated from free list */
   70         u_int v_pdwakeups;      /* number of times daemon has awaken from sleep */
   71         u_int v_pdpages;        /* number of pages analyzed by daemon */
   72 
   73         u_int v_dfree;          /* pages freed by daemon */
   74         u_int v_pfree;          /* pages freed by exiting processes */
   75         u_int v_tfree;          /* total pages freed */
   76         /*
   77          * Distribution of page usages.
   78          */
   79         u_int v_page_size;      /* page size in bytes */
   80         u_int v_page_count;     /* total number of pages in system */
   81         u_int v_free_reserved;  /* number of pages reserved for deadlock */
   82         u_int v_free_target;    /* number of pages desired free */
   83         u_int v_free_min;       /* minimum number of pages desired free */
   84         u_int v_free_count;     /* number of pages free */
   85         u_int v_wire_count;     /* number of pages wired down */
   86         u_int v_active_count;   /* number of pages active */
   87         u_int v_inactive_target; /* number of pages desired inactive */
   88         u_int v_inactive_count; /* number of pages inactive */
   89         u_int v_cache_count;    /* number of pages on buffer cache queue */
   90         u_int v_cache_min;      /* min number of pages desired on cache queue */
   91         u_int v_cache_max;      /* max number of pages in cached obj */
   92         u_int v_pageout_free_min;   /* min number pages reserved for kernel */
   93         u_int v_interrupt_free_min; /* reserved number of pages for int code */
   94         u_int v_free_severe;    /* severe depletion of pages below this pt */
   95         /*
   96          * Fork/vfork/rfork activity.
   97          */
   98         u_int v_forks;          /* number of fork() calls */
   99         u_int v_vforks;         /* number of vfork() calls */
  100         u_int v_rforks;         /* number of rfork() calls */
  101         u_int v_kthreads;       /* number of fork() calls by kernel */
  102         u_int v_forkpages;      /* number of VM pages affected by fork() */
  103         u_int v_vforkpages;     /* number of VM pages affected by vfork() */
  104         u_int v_rforkpages;     /* number of VM pages affected by rfork() */
  105         u_int v_kthreadpages;   /* number of VM pages affected by fork() by kernel */
  106 };
  107 #ifdef _KERNEL
  108 
  109 extern struct vmmeter cnt;
  110 
  111 /*
  112  * Return TRUE if we are under our reserved low-free-pages threshold
  113  */
  114 
  115 static __inline 
  116 int
  117 vm_page_count_reserved(void)
  118 {
  119     return (cnt.v_free_reserved > (cnt.v_free_count + cnt.v_cache_count));
  120 }
  121 
  122 /*
  123  * Return TRUE if we are under our severe low-free-pages threshold
  124  *
  125  * This routine is typically used at the user<->system interface to determine
  126  * whether we need to block in order to avoid a low memory deadlock.
  127  */
  128 
  129 static __inline 
  130 int
  131 vm_page_count_severe(void)
  132 {
  133     return (cnt.v_free_severe > (cnt.v_free_count + cnt.v_cache_count));
  134 }
  135 
  136 /*
  137  * Return TRUE if we are under our minimum low-free-pages threshold.
  138  *
  139  * This routine is typically used within the system to determine whether
  140  * we can execute potentially very expensive code in terms of memory.  It
  141  * is also used by the pageout daemon to calculate when to sleep, when
  142  * to wake waiters up, and when (after making a pass) to become more
  143  * desparate.
  144  */
  145 
  146 static __inline 
  147 int
  148 vm_page_count_min(void)
  149 {
  150     return (cnt.v_free_min > (cnt.v_free_count + cnt.v_cache_count));
  151 }
  152 
  153 /*
  154  * Return TRUE if we have not reached our free page target during
  155  * free page recovery operations.
  156  */
  157 
  158 static __inline 
  159 int
  160 vm_page_count_target(void)
  161 {
  162     return (cnt.v_free_target > (cnt.v_free_count + cnt.v_cache_count));
  163 }
  164 
  165 /*
  166  * Return the number of pages we need to free-up or cache
  167  * A positive number indicates that we do not have enough free pages.
  168  */
  169 
  170 static __inline 
  171 int
  172 vm_paging_target(void)
  173 {
  174     return (
  175         (cnt.v_free_target + cnt.v_cache_min) - 
  176         (cnt.v_free_count + cnt.v_cache_count)
  177     );
  178 }
  179 
  180 /*
  181  * Returns TRUE if the pagedaemon needs to be woken up.
  182  */
  183 
  184 static __inline 
  185 int
  186 vm_paging_needed(void)
  187 {
  188     return (
  189         (cnt.v_free_reserved + cnt.v_cache_min) >
  190         (cnt.v_free_count + cnt.v_cache_count)
  191     );
  192 }
  193 
  194 #endif
  195 
  196 /* systemwide totals computed every five seconds */
  197 struct vmtotal {
  198         int16_t t_rq;           /* length of the run queue */
  199         int16_t t_dw;           /* jobs in ``disk wait'' (neg priority) */
  200         int16_t t_pw;           /* jobs in page wait */
  201         int16_t t_sl;           /* jobs sleeping in core */
  202         int16_t t_sw;           /* swapped out runnable/short block jobs */
  203         int32_t t_vm;           /* total virtual memory */
  204         int32_t t_avm;          /* active virtual memory */
  205         int32_t t_rm;           /* total real memory in use */
  206         int32_t t_arm;          /* active real memory */
  207         int32_t t_vmshr;        /* shared virtual memory */
  208         int32_t t_avmshr;       /* active shared virtual memory */
  209         int32_t t_rmshr;        /* shared real memory */
  210         int32_t t_armshr;       /* active shared real memory */
  211         int32_t t_free;         /* free memory pages */
  212 };
  213 
  214 /*
  215  * Optional instrumentation.
  216  */
  217 #ifdef PGINPROF
  218 
  219 #define NDMON   128
  220 #define NSMON   128
  221 
  222 #define DRES    20
  223 #define SRES    5
  224 
  225 #define PMONMIN 20
  226 #define PRES    50
  227 #define NPMON   64
  228 
  229 #define RMONMIN 130
  230 #define RRES    5
  231 #define NRMON   64
  232 
  233 /* data and stack size distribution counters */
  234 u_int   dmon[NDMON+1];
  235 u_int   smon[NSMON+1];
  236 
  237 /* page in time distribution counters */
  238 u_int   pmon[NPMON+2];
  239 
  240 /* reclaim time distribution counters */
  241 u_int   rmon[NRMON+2];
  242 
  243 int     pmonmin;
  244 int     pres;
  245 int     rmonmin;
  246 int     rres;
  247 
  248 u_int rectime;          /* accumulator for reclaim times */
  249 u_int pgintime;         /* accumulator for page in times */
  250 #endif
  251 
  252 #endif

Cache object: 593591b60c3a6f9224db6f1b7ee778f9


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