fche changed the topic of #systemtap to: http://sourceware.org/systemtap; email systemtap@sourceware.org if answers here not timely, conversations may be logged
pwithnall has quit [Quit: pwithnall]
jlebon has quit [Ping timeout: 246 seconds]
jlebon has joined #systemtap
pfallenop has quit [Ping timeout: 255 seconds]
ggherdov` has quit [Ping timeout: 255 seconds]
CustosLimen has quit [Ping timeout: 255 seconds]
Cust0sLimen has quit [Ping timeout: 255 seconds]
pfallenop has joined #systemtap
pfallenop has quit [Changing host]
pfallenop has joined #systemtap
mbenitez has quit [Quit: Leaving]
Cust0sLimen has joined #systemtap
higgins` has joined #systemtap
CustosLimen has joined #systemtap
higgins has quit [Quit: Leaving]
vbernat has quit [Ping timeout: 255 seconds]
jistone has quit [Excess Flood]
vbernat has joined #systemtap
jistone has joined #systemtap
sanoj has joined #systemtap
ggherdov` has joined #systemtap
irker453 has quit [Quit: transmission timeout]
humblec has joined #systemtap
humblec has quit [Read error: Connection reset by peer]
humblec has joined #systemtap
orivej has joined #systemtap
orivej has quit [Ping timeout: 240 seconds]
sanoj has quit [Ping timeout: 255 seconds]
sanoj has joined #systemtap
slowfranklin has joined #systemtap
mjw has joined #systemtap
sanoj has quit [Ping timeout: 255 seconds]
stima has joined #systemtap
<stima>
Hi all. I have question, does system tap uses soft irq for its routine and can I avoid it? Can any one help me with it?
orivej has joined #systemtap
pwithnall has joined #systemtap
pwithnall has quit [Ping timeout: 255 seconds]
sanoj has joined #systemtap
nkambo has joined #systemtap
gromero has joined #systemtap
sanoj has quit [Ping timeout: 260 seconds]
<fche>
stima, I don't think stap -causes- softirqs, except perhaps for some background timer based internal activities
<fche>
normal systemtap probes run in interrupt-disabled types of atomic contexts, so they run and get back out quickly
nkambo has quit [Read error: Connection reset by peer]
<stima>
hi fche, thanks for reply. I'm trying to measure sysjitter influence and using "probe softirq.entry" to handle softirqs and running under system tap I got additional ~100 TIMER_SOFTIRQ. The measure program is simple "while(true);" on manually set cpu. With isolcpus on same cpu
<stima>
as additional I'm using kernel based on 4.1 with some rt patches (to be correct it is RedHawk RTOS 4.1.15-rt17-RedHawk-7.2-custom_debug), they use "shield" feature to avoid any local timer interrupts (or any other interrupts, takslets, softirqs, ets) on specified cpu.
<stima>
and without system tap /proc/softirq is not incremented
<stima>
with it is
<fche>
it could be that some of the tracing output timer related activity shows up that way
<fche>
I believe there are some runtime parameters to tune that ... just a hunch try stap -DSTP_RELAY_TIMER_INTERVAL=100 ...
<fche>
try it with =10, =100, =1000 even maybe
<fche>
there's also a -DSTP_CTL_TIMER_INTERVAL=... also measured in jiffies (1/"HZ") units
<stima>
thanks, ill try
wcohen has quit [Ping timeout: 240 seconds]
mbenitez has joined #systemtap
mbenitez has quit [Changing host]
mbenitez has joined #systemtap
drsmith_away is now known as drsmith
drsmith is now known as drsmith_away
drsmith_away is now known as drsmith
wcohen has joined #systemtap
brolley has joined #systemtap
tromey has joined #systemtap
orivej has quit [Ping timeout: 255 seconds]
irker398 has joined #systemtap
<irker398>
systemtap: dsmith systemtap.git:refs/heads/master * release-3.1-306-g54c6b53 / buildrun.cxx runtime/linux/autoconf-udelay_simple.c runtime/linux/common_session_state.h runtime/linux/runtime.h: Add a PR20516 workaround by using kallsyms_lookup_name to find udelay_simple. http://tinyurl.com/ya43ted6
nkambo has joined #systemtap
nkambo has quit [Read error: Connection reset by peer]
orivej has joined #systemtap
slowfranklin has quit [Quit: slowfranklin]
orivej has quit [Ping timeout: 260 seconds]
slowfranklin has joined #systemtap
nkambo has joined #systemtap
nkambo has quit [Remote host closed the connection]
orivej has joined #systemtap
drsmith is now known as drsmith_away
tromey has quit [Quit: ERC (IRC client for Emacs 26.0.60)]