vm_statistics.man

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    1 .\" 
    2 .\" Mach Operating System
    3 .\" Copyright (c) 1991,1990 Carnegie Mellon University
    4 .\" All Rights Reserved.
    5 .\" 
    6 .\" Permission to use, copy, modify and distribute this software and its
    7 .\" documentation is hereby granted, provided that both the copyright
    8 .\" notice and this permission notice appear in all copies of the
    9 .\" software, derivative works or modified versions, and any portions
   10 .\" thereof, and that both notices appear in supporting documentation.
   11 .\" 
   12 .\" CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
   13 .\" CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
   14 .\" ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
   15 .\" 
   16 .\" Carnegie Mellon requests users of this software to return to
   17 .\" 
   18 .\"  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
   19 .\"  School of Computer Science
   20 .\"  Carnegie Mellon University
   21 .\"  Pittsburgh PA 15213-3890
   22 .\" 
   23 .\" any improvements or extensions that they make and grant Carnegie Mellon
   24 .\" the rights to redistribute these changes.
   25 .\" 
   26 .\" 
   27 .\" HISTORY
   28 .\" $Log:       vm_statistics.man,v $
   29 .\" Revision 2.5  93/03/18  15:17:07  mrt
   30 .\"     corrected types
   31 .\"     [93/03/12  16:55:44  lli]
   32 .\" 
   33 .\" Revision 2.4  91/05/14  17:16:37  mrt
   34 .\"     Correcting copyright
   35 .\" 
   36 .\" Revision 2.3  91/02/14  14:16:45  mrt
   37 .\"     Changed to new Mach copyright
   38 .\"     [91/02/12  18:17:45  mrt]
   39 .\" 
   40 .\" Revision 2.2  90/08/07  18:48:18  rpd
   41 .\"     Created.
   42 .\" 
   43 .TH vm_statistics 2 9/19/86
   44 .CM 4
   45 .SH NAME
   46 .nf
   47 vm_statistics  \-  returns virtual memory statistics for the system
   48 .SH SYNOPSIS
   49 .nf
   50 .ft B
   51 #include <mach.h>
   52 
   53 struct vm_statistics {
   54         long    pagesize;               /* page size in bytes */
   55         long    free_count;             /* # of pages free */
   56         long    active_count;           /* # of pages active */
   57         long    inactive_count;         /* # of pages inactive */
   58         long    wire_count;             /* # of pages wired down */
   59         long    zero_fill_count;        /* # of zero fill pages */
   60         long    reactivations;          /* # of pages reactivated */
   61         long    pageins;                /* # of pageins */
   62         long    pageouts;               /* # of pageouts */
   63         long    faults;                 /* # of faults */
   64         long    cow_faults;             /* # of copy-on-writes */
   65         long    lookups;                /* object cache lookups */
   66         long    hits;                   /* object cache hits */
   67 };
   68 
   69 typedef struct vm_statistics    vm_statistics_data_t; 
   70 
   71 .nf
   72 .ft B
   73 kern_return_t   vm_statistics(target_task, vm_stats)
   74         mach_port_t             target_task;
   75         vm_statistics_data_t    *vm_stats;      /* out */
   76 
   77 
   78 .fi
   79 .ft P
   80 .SH ARGUMENTS
   81 .TP 15
   82 .B
   83 target_task
   84 Task which is requesting statistics.
   85 .TP 15
   86 .B
   87 vm_stats
   88 The structure that will receive the statistics.
   89 
   90 .SH DESCRIPTION
   91 .B vm_statistics
   92 returns the statistics about the kernel's use of virtual memory
   93 since the kernel was booted.
   94 .B pagesize
   95 can also be found as a global variable 
   96 .B vm_page_size
   97 which
   98 is set at task initialization and remains constant for the life of the task.
   99 
  100 .SH DIAGNOSTICS
  101 .TP 25
  102 KERN_SUCCESS
  103

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