fche changed the topic of #systemtap to: http://sourceware.org/systemtap; email systemtap@sourceware.org if answers here not timely, conversations may be logged
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<lorddoskias>
how can i tell stap to only look for kernel sources + debug info in the current directory
<lorddoskias>
and pwd is a kernel build directory with vmlinux file inside of it + kernel sources
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<fche>
it should work
<fche>
stap -vvv etc. for more info about what stap's looking at
<lorddoskias>
fche: thanks i dealt with that issue :). Now I'm battling with histograms
<lorddoskias>
can I create histograms of calltraces?
<lorddoskias>
e.g. callstack[backtrace()] << 1
<lorddoskias>
and then use @hist_linear to print it (I already tried and got errors re. arity)
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<fche>
histogram buckets are by necessity based on simple integers
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<lorddoskias>
fche: so no way to achieve that
<fche>
look at the way the pf* examples do it
<fche>
not via histograms but scalar stats (counts indexed by backtrace-tuples)
<fche>
then one can report on them based on / sorted-by @count()
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<lorddoskias>
okay, thanks ;)
<lorddoskias>
btw what's the state of the ebpf backend i.e. is git HEAD ok for general usage?
<lorddoskias>
last time you said things were crazy
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<sona>
hi
<fche>
things are getting better
<fche>
we'd love for you to try it :)
<sona>
is there any way to access target variable outside probe definition
<sona>
target varaibles depend on the probe function , which is dependent on command line argument given by user
<sona>
in my case
<fche>
$vars are dependent on the context of a probe to even resolve them / make sense of them
<fche>
there is a construct @var("name") for accessing from other contexts, but that has a variety of constraints too
<fche>
consider: if you put a breakpoint into a random program at a random point, most variables won't even exist from those points (like a local variable from a function that's not currently running)
<sona>
okie
<sona>
fche, i am writing a genaralize script to probe few functions and checking value of a few target variables ( which exists at the time of probing), say a and b are functions . I want to take value of target varaible for the, say tar_var=$this (for function a) and tar_var=$inode (for function b)
<sona>
how to make this possible
<fche>
you could pass $this / $inode as parameters to a common function perhaps
<fche>
or use a common probe handler, and if (@defined($this)) { do_something_with($this) }
<sona>
fche, kool
<sona>
fche, thanks
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<sona>
are you free?
<sona>
sorry, by mistake, ignore
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<irker817>
systemtap: dsmith systemtap.git:refs/heads/master * release-3.1-66-g696a4ac / systemtap.spec: Add support for the httpd code to systemtap.spec, defaulting to "off". http://tinyurl.com/n3mtkjb
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<irker817>
systemtap: dsmith systemtap.git:refs/heads/master * release-3.1-67-g90f2c8d / systemtap.spec: Fix my typo in systemtap.spec. http://tinyurl.com/lvwrxoo