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# -*-Perl-*-
# instances allowed: one
# (single instance modules would be silly to use more than one of
# anyway, so we use package local storage. This is faster and places
# less artificial load on the machine than doing everything through
# the object hash)
# todo: go back to using disk id numbers as reported rather than
# trying to make a contiguous numbering
package MGMmodule::diskstat;
use vars qw($xpath @rsectors @wsectors @prevr @prevw $widget $graph
$numdisks $lastmod $kernel);
# class init
sub module_init{
my$this=shift;
my$toplevel=$this->{"toplevel"};
my$xclass=$this->{"xclass"};
# how many disks? Call read once to init
$numdisks=0;
# 2.0 and 2.2
if(defined($MGMmodule::helperST::proc{"disk_rblk"})){
$kernel=0;$this->read_proc;
}
# 2.4
if(defined($MGMmodule::helperST::proc{"disk_io:"})){
$kernel=4;$this->read_proc;
}
map{$numdisks++ if ($rsectors[$_] || $wsectors[$_])}(0..$#rsectors);
if(!$numdisks){
$toplevel->optionAdd("$xclass.active",'false',21);
}
$toplevel->optionAdd("$xclass.order",10,21);
$this;
}
# instance init
sub module_instance{
my$this=shift;
my$toplevel=$this->{"toplevel"};
return undef if(defined($xpath));
$xpath=$this->{"xpath"};
# modify defaults
for(my$i=0;$i<$numdisks;$i++){
$toplevel->optionAdd("$xpath.bar.".($i*2).".label",
"disk$i read",21);
$toplevel->optionAdd("$xpath.bar.".($i*2+1).".label",
"disk$i write",21);
$toplevel->optionAdd("$xpath.bar.".($i*2).".litbackground",
'#e7ad74',21);
$toplevel->optionAdd("$xpath.bar.".($i*2+1).".litbackground",
'#ade774',21);
}
$toplevel->optionAdd("$xpath.scalewidadj", 160*$numdisks,21); # narrower
$toplevel->optionAdd("$xpath.scalereturn", 120,21);
# this relies on the above defaults
my($minx,$miny)=MGM::Graph::calcxysize($this,1024*1024*512,
' sect/s',$numdisks*2);
$toplevel->optionAdd("$xpath.minx", $minx,21);
$toplevel->optionAdd("$xpath.miny", $miny,21);
$this;
}
# instance widget build
sub module_run{
my$this=shift;
$graph=MGM::Graph->new($this,num=>$numdisks*2,
prompt=>' sect/s',
minscale=>128);
$lastmod=-1;
$widget=$graph->{"widget"}; # must return the widget
}
sub read_proc{
# now uses the 00helper to save on opens
if($kernel==4){
my $disk;
my@disks=split ' ',$MGMmodule::helperST::proc{"disk_io:"};
my$i=0;
undef @rsectors;
undef @wsectors;
foreach $disk (@disks){
$disk=~m/\(\d+,\d+\):\(\d+,\d+,(\d+),\d+,(\d+)\)/;
$rsectors[$i]=$1;
$wsectors[$i]=$2;
$i++;
}
}else{
@rsectors=split ' ',$MGMmodule::helperST::proc{"disk_rblk"};
@wsectors=split ' ',$MGMmodule::helperST::proc{"disk_wblk"};
}
}
sub module_update{
my$this=shift;
# don't update unless the helper has
if($lastmod!=$MGMmodule::helperST::lastmod){
my$time=$MGMmodule::helperST::lastmod;
$this->read_proc;
return &reconfig if($numdisks-1 != $#rsectors);
if(defined(@prevr)){
my @vals;
for(my$i=0;$i<=$#rsectors;$i++){
if ($rsectors[$i] or $wsectors[$i]){
my$r=($rsectors[$i]-$prevr[$i])/($time-$lastmod)*100;
my$w=($wsectors[$i]-$prevw[$i])/($time-$lastmod)*100;
push @vals, $r, $w;
}
}
# don't be clever and only call set if values change; set must
# be called each refresh period or the graph will get
# confused.
$graph->set(@vals);
}
@prevr=@rsectors;
@prevw=@wsectors;
$lastmod=$time;
}
}
sub reconfig{
$numdisks= $#rsectors+1;
@prevr=@rsectors;
@prevw=@wsectors;
&main::reinstance() if($widget->optionGet("reconfig","") eq 'true');
}
sub destroy{
undef $xpath;
}
bless {};
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