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#! /usr/bin/env stap
# rwtiming.stp
#
# This is a simple example to track the amount of time
# spent doing reads and writes for the various programs running on the
# system.
probe begin { log("starting probe") }
global names, opens, reads, writes
global entry_opens, entry_reads, entry_writes
global time_opens, time_reads, time_writes
probe kernel.function("sys_open") {
t=gettimeofday_us(); p=pid(); e=execname();
names[e]=1
opens[e] ++ # plain integer
entry_opens[p] = t;
}
probe kernel.function("sys_open").return {
t=gettimeofday_us(); p=pid(); e=execname();
time_opens[e] <<< t - entry_opens[p];
}
probe kernel.function("sys_read") {
t= gettimeofday_us(); p =pid(); e=execname();
names[e]=1
reads[e] <<< $count # statistics
entry_reads[p] = t;
}
probe kernel.function("sys_read").return {
t=gettimeofday_us(); p=pid(); e=execname();
time_reads[e] <<< t - entry_reads[p];
}
probe kernel.function("sys_write") {
t=gettimeofday_us(); p=pid(); e=execname();
names[e]=1
writes[e] <<< $count # statistics
entry_writes[p] = t;
}
probe kernel.function("sys_write").return {
t = gettimeofday_us(); p = pid(); e=execname();
time_writes[e] <<< t - entry_writes[p];
}
probe end {
foreach(name+ in names) { # sort by names
printf ("process: %s\n", name)
if (opens[name]) {
printf ("opens n=%d\n", opens[name])
print (@hist_log(time_opens[name]))
}
if (@count(reads[name])) {
printf ("reads n=%d, sum=%d, avg=%d\n",
@count(reads[name]), # extracting stat results
@sum(reads[name]),
@avg(reads[name]))
print ("read timing distribution\n")
print (@hist_log(time_reads[name]))
}
if (@count(writes[name])) {
printf ("writes n=%d, sum=%d, avg=%d\n",
@count(writes[name]), # extracting stat results
@sum(writes[name]),
@avg(writes[name]))
print ("write timing distribution\n")
print (@hist_log(time_writes[name]))
}
}
}
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