nikon/tuned
1
0
Fork 0
Code Activity Actions

jhutar@redhat.com: scomes now watches also forked sub-processes

Browse source 
KNOWN BUG: Scomes ends when main process ends. So if there is some forked process in the background which lasts longer, some part of it will be missed.
This commit is contained in:
Petr Lautrbach 2009-08-27 13:19:40 +02:00
parent b596ac9f1f
commit e5c73033ae
1 changed files with 22 additions and 17 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

39
contrib/scomes Normal file → Executable file
View file

@ -3,12 +3,17 @@
# ===================================================================
# Do this when we have started
global report_period = 0
# For watch_forked variable:
# 0 = watch only main thread
# 1 = watch forked with same execname as well
# 2 = watch all forked processes
global watch_forked = 2
probe begin {
if ($# == 1) {
report_period = $1
}
PIDS[target()] = 1 # initialise list of watched pids
print("Collecting data...\n")
printf("... for pid %d - %s\n", target(), pid2execname(target()))
}
# ===================================================================
@ -19,7 +24,8 @@ function compute_score() {
}
function print_status() {
printf("-----------------------------------\n")
printf("Monitored execname: %s\n", pid2execname(target()))
###target_set_report()
printf("Monitored process: %d (%s)\n", target(), pid2execname(target()))
printf("Number of syscalls: %d\n", syscalls)
printf("Kernel/Userspace ticks: %d/%d (%d)\n", kticks, uticks, kticks+uticks)
printf("Read/Written bytes: %d/%d (%d)\n", reads, writes, reads+writes)
@ -32,9 +38,9 @@ function print_status() {
# Define helper function for comparing if this is relevant pid
# and for watching if our watched pid forked
# ... from http://sourceware.org/systemtap/wiki/systemtapstarters
global PIDS
global PIDS = 1 # as target() is already running
function is_watched(p) {
if (p == target() || p in PIDS) {
if ( (watch_forked == 0 && p == target()) || (watch_forked == 1 && target_set_pid(p) && pid2execname(target()) == pid2execname(p)) || (watch_forked == 2 && target_set_pid(p)) ) {
#printf("Process %d is relevant to process %d\n", p, target())
return 1 # yes, we are watching this pid
} else {
@ -43,26 +49,22 @@ function is_watched(p) {
}
# Add a relevant forked process to the list of watched processes
probe kernel.function("do_fork") {
if (is_watched(ppid()) && pexecname() == execname()) { # we do not care about forked processes with different name (e.g. when cron lunches something)
#printf("Proces forked with %d(%d)->%d as %s->%s - adding\n", ppid(), target(), pid(), pexecname(), execname())
PIDS[pid()] = 1
#foreach (p in PIDS) {
# println(p, PIDS[p])
#}
#printf("Fork of %d (%s) detected\n", pid(), execname())
if (is_watched(pid())) {
#printf("Proces %d forked\n", pid())
PIDS = PIDS + 1
#printf("Currently watching %d pids (1 just added)\n", PIDS)
}
}
# Remove pid from the list of watched pids and print report when
# all relevant processes ends
probe syscall.exit {
if (pid() in PIDS) {
if (is_watched(pid())) {
#printf("Removing process %d\n", pid())
delete PIDS[pid()]
PIDS = PIDS - 1
}
count = 0
foreach (p in PIDS) {
count++
}
if (count == 0) {
#printf("Currently watching %d pids (1 just removed)\n", PIDS)
if (PIDS == 0) {
printf("-----------------------------------\n")
printf("LAST RESULTS:\n")
print_status()
@ -187,6 +189,9 @@ probe timer.s(1) {
# ===================================================================
# Print quit message
probe end {
printf("-----------------------------------\n")
printf("LAST RESULTS:\n")
print_status()
printf("-----------------------------------\n")
printf("QUITTING\n")
printf("-----------------------------------\n")