"Fossies" - the Fresh Open Source Software Archive

Member "xosview-1.23/linux/pagemeter.cc" (11 Jul 2020, 3220 Bytes) of package /linux/misc/xosview-1.23.tar.gz:

    1 //
    2 //  Copyright (c) 1996, 2004 by Massimiliano Ghilardi ( ghilardi@cibs.sns.it )
    3 //
    4 //  This file may be distributed under terms of the GPL
    5 //
    6 
    7 #include "pagemeter.h"
    8 #include <stdlib.h>
    9 #include <sys/types.h>
   10 #include <sys/stat.h>
   11 #include <string.h>
   12 #include <fstream>
   13 #include <iostream>
   14 
   15 #define MAX_PROCSTAT_LENGTH 4096
   16 
   17 
   18 PageMeter::PageMeter( XOSView *parent, float max )
   19   : FieldMeterGraph( parent, 3, "PAGE", "IN/OUT/IDLE" ),
   20   _vmstat(false), _statFileName("/proc/stat"){
   21   for ( int i = 0 ; i < 2 ; i++ )
   22     for ( int j = 0 ; j < 2 ; j++ )
   23       pageinfo_[j][i] = 0;
   24 
   25   maxspeed_ = max;
   26   pageindex_ = 0;
   27 
   28   struct stat buf;
   29   if (stat("/proc/vmstat", &buf) == 0
   30     && buf.st_mode & S_IFREG)
   31       {
   32       _vmstat = true;
   33       _statFileName = "/proc/vmstat";
   34       }
   35 }
   36 
   37 PageMeter::~PageMeter( void ){
   38 }
   39 
   40 void PageMeter::checkResources( void ){
   41   FieldMeterGraph::checkResources();
   42 
   43   setfieldcolor( 0, parent_->getResource( "pageInColor" ) );
   44   setfieldcolor( 1, parent_->getResource( "pageOutColor" ) );
   45   setfieldcolor( 2, parent_->getResource( "pageIdleColor" ) );
   46   priority_ = atoi (parent_->getResource( "pagePriority" ) );
   47   maxspeed_ *= priority_ / 10.0;
   48   dodecay_ = parent_->isResourceTrue( "pageDecay" );
   49   useGraph_ = parent_->isResourceTrue( "pageGraph" );
   50   SetUsedFormat (parent_->getResource("pageUsedFormat"));
   51 }
   52 
   53 void PageMeter::checkevent( void ){
   54  if (_vmstat)
   55      getvmpageinfo();
   56  else
   57      getpageinfo();
   58  drawfields();
   59 }
   60 
   61 void PageMeter::updateinfo(void)
   62     {
   63     int oldindex = (pageindex_+1)%2;
   64     for ( int i = 0; i < 2; i++ )
   65         {
   66         if ( pageinfo_[oldindex][i] == 0 )
   67             pageinfo_[oldindex][i] = pageinfo_[pageindex_][i];
   68 
   69         fields_[i] = pageinfo_[pageindex_][i] - pageinfo_[oldindex][i];
   70         total_ += fields_[i];
   71         }
   72 
   73     if ( total_ > maxspeed_ )
   74         fields_[2] = 0.0;
   75     else
   76         {
   77         fields_[2] = maxspeed_ - total_;
   78         total_ = maxspeed_;
   79         }
   80 
   81     setUsed (total_ - fields_[2], maxspeed_);
   82     pageindex_ = (pageindex_ + 1) % 2;
   83     }
   84 
   85 void PageMeter::getvmpageinfo(void)
   86     {
   87     total_ = 0;
   88     char buf[MAX_PROCSTAT_LENGTH];
   89     bool found_in = false, found_out = false;
   90     std::ifstream stats(_statFileName);
   91     if (!stats)
   92         {
   93         std::cerr <<"Cannot open file : " << _statFileName << std::endl;
   94         exit(1);
   95         }
   96     while (!stats.eof() && !(found_in && found_out))
   97         {
   98         stats.getline(buf, MAX_PROCSTAT_LENGTH);
   99         if (!strncmp(buf, "pswpin", 6))
  100             {
  101             pageinfo_[pageindex_][0] = strtoul(buf+7, NULL, 10);
  102             found_in = true;
  103             }
  104         if (!strncmp(buf, "pswpout", 7))
  105             {
  106             pageinfo_[pageindex_][1] = strtoul(buf+8, NULL, 10);
  107             found_out = true;
  108             }
  109         }
  110     updateinfo();
  111     }
  112 
  113 void PageMeter::getpageinfo( void ){
  114   total_ = 0;
  115   char buf[MAX_PROCSTAT_LENGTH];
  116   std::ifstream stats(_statFileName);
  117 
  118   if ( !stats ){
  119     std::cerr <<"Cannot open file : " << _statFileName << std::endl;
  120     exit( 1 );
  121   }
  122 
  123   do {
  124     stats >>buf;
  125   } while (!stats.eof() && strncasecmp(buf, "swap", 5));
  126 
  127   stats >>pageinfo_[pageindex_][0] >>pageinfo_[pageindex_][1];
  128 
  129   updateinfo();
  130 }