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  * SPDX-License-Identifier: BSD-3-Clause
    3  *
    4  * Copyright (c) 1982, 1986, 1993
    5  *      The Regents of the University of California.  All rights reserved.
    6  *
    7  * Redistribution and use in source and binary forms, with or without
    8  * modification, are permitted provided that the following conditions
    9  * are met:
   10  * 1. Redistributions of source code must retain the above copyright
   11  *    notice, this list of conditions and the following disclaimer.
   12  * 2. Redistributions in binary form must reproduce the above copyright
   13  *    notice, this list of conditions and the following disclaimer in the
   14  *    documentation and/or other materials provided with the distribution.
   15  * 3. Neither the name of the University nor the names of its contributors
   16  *    may be used to endorse or promote products derived from this software
   17  *    without specific prior written permission.
   18  *
   19  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   29  * SUCH DAMAGE.
   30  *
   31  *      @(#)vmmeter.h   8.2 (Berkeley) 7/10/94
   32  * $FreeBSD: stable/12/sys/sys/vmmeter.h 338919 2018-09-24 19:24:17Z markj $
   33  */
   34 
   35 #ifndef _SYS_VMMETER_H_
   36 #define _SYS_VMMETER_H_
   37 
   38 /*
   39  * This value is used by ps(1) to change sleep state flag from 'S' to
   40  * 'I' and by the sched process to set the alarm clock.
   41  */
   42 #define MAXSLP                  20
   43 
   44 struct vmtotal {
   45         uint64_t        t_vm;           /* total virtual memory */
   46         uint64_t        t_avm;          /* active virtual memory */
   47         uint64_t        t_rm;           /* total real memory in use */
   48         uint64_t        t_arm;          /* active real memory */
   49         uint64_t        t_vmshr;        /* shared virtual memory */
   50         uint64_t        t_avmshr;       /* active shared virtual memory */
   51         uint64_t        t_rmshr;        /* shared real memory */
   52         uint64_t        t_armshr;       /* active shared real memory */
   53         uint64_t        t_free;         /* free memory pages */
   54         int16_t         t_rq;           /* length of the run queue */
   55         int16_t         t_dw;           /* threads in ``disk wait'' (neg
   56                                            priority) */
   57         int16_t         t_pw;           /* threads in page wait */
   58         int16_t         t_sl;           /* threads sleeping in core */
   59         int16_t         t_sw;           /* swapped out runnable/short
   60                                            block threads */
   61         uint16_t        t_pad[3];
   62 };
   63 
   64 #if defined(_KERNEL) || defined(_WANT_VMMETER)
   65 #include <sys/counter.h>
   66 
   67 #ifdef _KERNEL
   68 #define VMMETER_ALIGNED __aligned(CACHE_LINE_SIZE)
   69 #else
   70 #define VMMETER_ALIGNED
   71 #endif
   72 
   73 /*
   74  * System wide statistics counters.
   75  * Locking:
   76  *      c - constant after initialization
   77  *      p - uses counter(9)
   78  */
   79 struct vmmeter {
   80         /*
   81          * General system activity.
   82          */
   83         counter_u64_t v_swtch;          /* (p) context switches */
   84         counter_u64_t v_trap;           /* (p) calls to trap */
   85         counter_u64_t v_syscall;        /* (p) calls to syscall() */
   86         counter_u64_t v_intr;           /* (p) device interrupts */
   87         counter_u64_t v_soft;           /* (p) software interrupts */
   88         /*
   89          * Virtual memory activity.
   90          */
   91         counter_u64_t v_vm_faults;      /* (p) address memory faults */
   92         counter_u64_t v_io_faults;      /* (p) page faults requiring I/O */
   93         counter_u64_t v_cow_faults;     /* (p) copy-on-writes faults */
   94         counter_u64_t v_cow_optim;      /* (p) optimized COW faults */
   95         counter_u64_t v_zfod;           /* (p) pages zero filled on demand */
   96         counter_u64_t v_ozfod;          /* (p) optimized zero fill pages */
   97         counter_u64_t v_swapin;         /* (p) swap pager pageins */
   98         counter_u64_t v_swapout;        /* (p) swap pager pageouts */
   99         counter_u64_t v_swappgsin;      /* (p) swap pager pages paged in */
  100         counter_u64_t v_swappgsout;     /* (p) swap pager pages paged out */
  101         counter_u64_t v_vnodein;        /* (p) vnode pager pageins */
  102         counter_u64_t v_vnodeout;       /* (p) vnode pager pageouts */
  103         counter_u64_t v_vnodepgsin;     /* (p) vnode_pager pages paged in */
  104         counter_u64_t v_vnodepgsout;    /* (p) vnode pager pages paged out */
  105         counter_u64_t v_intrans;        /* (p) intransit blocking page faults */
  106         counter_u64_t v_reactivated;    /* (p) reactivated by the pagedaemon */
  107         counter_u64_t v_pdwakeups;      /* (p) times daemon has awaken */
  108         counter_u64_t v_pdpages;        /* (p) pages analyzed by daemon */
  109         counter_u64_t v_pdshortfalls;   /* (p) page reclamation shortfalls */
  110 
  111         counter_u64_t v_dfree;          /* (p) pages freed by daemon */
  112         counter_u64_t v_pfree;          /* (p) pages freed by processes */
  113         counter_u64_t v_tfree;          /* (p) total pages freed */
  114         /*
  115          * Fork/vfork/rfork activity.
  116          */
  117         counter_u64_t v_forks;          /* (p) fork() calls */
  118         counter_u64_t v_vforks;         /* (p) vfork() calls */
  119         counter_u64_t v_rforks;         /* (p) rfork() calls */
  120         counter_u64_t v_kthreads;       /* (p) fork() calls by kernel */
  121         counter_u64_t v_forkpages;      /* (p) pages affected by fork() */
  122         counter_u64_t v_vforkpages;     /* (p) pages affected by vfork() */
  123         counter_u64_t v_rforkpages;     /* (p) pages affected by rfork() */
  124         counter_u64_t v_kthreadpages;   /* (p) ... and by kernel fork() */
  125         counter_u64_t v_wire_count;     /* (p) pages wired down */
  126 #define VM_METER_NCOUNTERS      \
  127         (offsetof(struct vmmeter, v_page_size) / sizeof(counter_u64_t))
  128         /*
  129          * Distribution of page usages.
  130          */
  131         u_int v_page_size;      /* (c) page size in bytes */
  132         u_int v_page_count;     /* (c) total number of pages in system */
  133         u_int v_free_reserved;  /* (c) pages reserved for deadlock */
  134         u_int v_free_target;    /* (c) pages desired free */
  135         u_int v_free_min;       /* (c) pages desired free */
  136         u_int v_inactive_target; /* (c) pages desired inactive */
  137         u_int v_pageout_free_min;   /* (c) min pages reserved for kernel */
  138         u_int v_interrupt_free_min; /* (c) reserved pages for int code */
  139         u_int v_free_severe;    /* (c) severe page depletion point */
  140 };
  141 #endif /* _KERNEL || _WANT_VMMETER */
  142 
  143 #ifdef _KERNEL
  144 
  145 #include <sys/domainset.h>
  146 
  147 extern struct vmmeter vm_cnt;
  148 extern domainset_t all_domains;
  149 extern domainset_t vm_min_domains;
  150 extern domainset_t vm_severe_domains;
  151 
  152 #define VM_CNT_ADD(var, x)      counter_u64_add(vm_cnt.var, x)
  153 #define VM_CNT_INC(var)         VM_CNT_ADD(var, 1)
  154 #define VM_CNT_FETCH(var)       counter_u64_fetch(vm_cnt.var)
  155 
  156 static inline void
  157 vm_wire_add(int cnt)
  158 {
  159 
  160         VM_CNT_ADD(v_wire_count, cnt);
  161 }
  162 
  163 static inline void
  164 vm_wire_sub(int cnt)
  165 {
  166 
  167         VM_CNT_ADD(v_wire_count, -cnt);
  168 }
  169 
  170 u_int vm_free_count(void);
  171 static inline u_int
  172 vm_wire_count(void)
  173 {
  174 
  175         return (VM_CNT_FETCH(v_wire_count));
  176 }
  177 
  178 /*
  179  * Return TRUE if we are under our severe low-free-pages threshold
  180  *
  181  * These routines are typically used at the user<->system interface to determine
  182  * whether we need to block in order to avoid a low memory deadlock.
  183  */
  184 static inline int
  185 vm_page_count_severe(void)
  186 {
  187 
  188         return (!DOMAINSET_EMPTY(&vm_severe_domains));
  189 }
  190 
  191 static inline int
  192 vm_page_count_severe_domain(int domain)
  193 {
  194 
  195         return (DOMAINSET_ISSET(domain, &vm_severe_domains));
  196 }
  197 
  198 static inline int
  199 vm_page_count_severe_set(const domainset_t *mask)
  200 {
  201 
  202         return (DOMAINSET_SUBSET(&vm_severe_domains, mask));
  203 }
  204 
  205 /*
  206  * Return TRUE if we are under our minimum low-free-pages threshold.
  207  *
  208  * These routines are typically used within the system to determine whether
  209  * we can execute potentially very expensive code in terms of memory.  It
  210  * is also used by the pageout daemon to calculate when to sleep, when
  211  * to wake waiters up, and when (after making a pass) to become more
  212  * desperate.
  213  */
  214 static inline int
  215 vm_page_count_min(void)
  216 {
  217 
  218         return (!DOMAINSET_EMPTY(&vm_min_domains));
  219 }
  220 
  221 static inline int
  222 vm_page_count_min_domain(int domain)
  223 {
  224 
  225         return (DOMAINSET_ISSET(domain, &vm_min_domains));
  226 }
  227 
  228 static inline int
  229 vm_page_count_min_set(const domainset_t *mask)
  230 {
  231 
  232         return (DOMAINSET_SUBSET(&vm_min_domains, mask));
  233 }
  234 
  235 #endif  /* _KERNEL */
  236 #endif  /* _SYS_VMMETER_H_ */

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