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#! /usr/bin/env stap
global reads, writes, totals
probe begin { printf("starting probe\n") }
probe vfs.read.return {
count = returnval()
if ( count >= 0 ) {
reads[execname(),dev] <<< count # statistics array
totals[execname(),dev] <<< count
}
}
probe vfs.write.return {
count = returnval()
if (count >= 0 ) {
writes[execname(),dev] <<< count # statistics array
totals[execname(),dev] <<< count
}
}
probe end {
printf("\n%16s %8s %8s %8s %8s %8s %8s %8s\n",
"", "", "", "read", "read", "", "write", "write")
printf("%16s %8s %8s %8s %8s %8s %8s %8s\n",
"name", "device", "read", "KB tot", "B avg", "write", "KB tot", "B avg")
foreach ([name,dev] in totals @sum- limit 20) { # sort by total io
printf("%16s %3d, %4d %8d %8d %8d %8d %8d %8d\n",
name, MAJOR(dev), MINOR(dev),
@count(reads[name,dev]),
(@count(reads[name,dev]) ? @sum(reads[name,dev])>>10 : 0 ),
(@count(reads[name,dev]) ? @avg(reads[name,dev]) : 0 ),
@count(writes[name,dev]),
(@count(writes[name,dev]) ? @sum(writes[name,dev])>>10 : 0 ),
(@count(writes[name,dev]) ? @avg(writes[name,dev]) : 0 ))
}
}
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