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proc genload {} {
# if 'genload' from the ltp exists, use it to create a real load
set genload {/usr/local/ltp/testcases/bin/genload}
if [file executable $genload] {
exec $genload -c 10 -i 10 -m 10 -t 10
# ^^^^^ run for 10 seconds
# ^^^^^ 10 procs spinning on malloc
# ^^^^^ 10 procs spinning on sync
# ^^^^^ 10 procs spinning on sqrt
} else {
# sleep for a bit
after 10000
}
return 0
}
proc probe_ok {probepoint} {
set cmd {exec stap -p2 -e}
lappend cmd "probe $probepoint {}"
return [expr ![catch $cmd]]
}
set systemtap_script {
global stat
probe %s {
stat[probefunc()] <<< 1
}
probe begin { log ("systemtap starting probe") }
probe end {
log ("systemtap ending probe")
foreach (func in stat limit 5) # don't overflow expect buffer
printf("%%d %%s\n", @count(stat[func]), func)
}
}
set letters [split {abcdefghijklmnopqrstuvwxyz_ABCDEFGHIJKLMNOPQRSTUVWXYZ} {}]
set output_string "(\\d+ \\w+\\r\\n)*(WARNING.*skipped.*)?"
# Because this test is known to expose system crashes, it is not enabled
# by default. Change the line below to 'if 1' to enable it.
if 0 {
foreach start $letters {
set probepoint "kernel.function(\"$start*\")"
set prefix "all_kernel_functions:"
if [probe_ok $probepoint] {
set script [format $systemtap_script $probepoint]
stap_run $prefix$probepoint genload $output_string -e $script
} else {
unsupported "$prefix no match for $probepoint"
}
}
} else {
untested "all_kernel_functions is disabled"
}
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