#systemtap on 2017-05-03 — irc logs at freenode.irclog.whitequark.org

2015-11-12 23:18 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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14:46 <yoppa> hi! is there a direct way (beside walking task struct list) to get a list of currently alive PIDs when the stap script starts e.g. in probe begin? I'd like to probe every new process, yet I want to exclude some procs that could enter the forking set

14:47 <yoppa> for example I launch a program via ssh but I want to exclude the tracing of sshd itself and so on. thanks!

14:47 <fche> a couple of questions - how do you want to probe those new processes?

14:49 <yoppa> for now I'm using a 3 level filtering system. I filter by a specifid uid, than I check if execname belongs to a list (including for example sshd, stapio, systemd ....) and finally I check if the process is in the forked set

14:49 <fche> - is the process.begin probe (which implicitly enumerates preexisting processes) good enoguh?

14:50 <fche> % sudo stap -e 'probe process.begin { println(pid(), " ", execname()) } ' -T 1

14:50 <yoppa> and yes, by probing I mean I'm tracking all the syscalls with probe nd_syscall.* and nd_syscall.*.return

14:50 <fche> --- enumerates current processes

14:50 <fche> ok, so probing the kernel, but filtering based on the calling process

14:50 <yoppa> exactly, sorry

14:51 <yoppa> the problem is that checking if execname is one of the avoided names is not flexible. I prefer to get the pids of those names at runtime

14:52 <fche> you can catch forks & exec's, and track pids and/or execnames as they change, if you like

14:52 <yoppa> but for now I'm only thinking of walking the task structs to get the pids

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14:52 <fche> again probe process.begin { } will walk that stuff for you and call once per existing process

14:52 <fche> will fix the docs to spell this out

14:53 <yoppa> mmhh ok. I was sure process.begin is a one-time call fired when the stap script starts

14:53 <fche> no, that's 'begin'

14:55 <yoppa> ouh damn my mistake. I confused the two.

14:55 <fche> 's ok

14:55 <yoppa> really thanks fche. always ready and available to help

14:56 <yoppa> that seems to be what I was looking for

14:56 <fche> heh not always but we try! :)

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14:59 <irker031> systemtap: fche systemtap.git:refs/heads/master * release-3.1-62-gd082e17 / man/stapprobes.3stap: man stapprobes: mention that process.begin enumerates http://tinyurl.com/lbvec5y

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16:35 <irker031> systemtap: csanting systemtap.git:refs/heads/master * release-3.1-63-g87c1224 / tapset/ansi.stp tapset/linux/conversions.stp tapset/linux/proc_mem.stp tapset/linux/task_time.stp tapset/uconversions.stp: Remove duplication in deprecated tapset functions http://tinyurl.com/lk2m28k

16:35 <fche> thanks cody

16:35 <csanting> np

16:35 <csanting> the os updates resolved all issue I was having

16:36 <fche> very good

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17:50 <irker031> systemtap: rth systemtap.git:refs/heads/master * release-3.1-64-gceac2b1 / dwflpp.cxx dwflpp.h staptree.h: Fix some errors in the loc2stap rewrite http://tinyurl.com/lrhkpvz

17:50 <irker031> systemtap: rth systemtap.git:refs/heads/master * release-3.1-65-g02a3ce2 / translate.cxx: Emit deref_fault labels http://tinyurl.com/mbmgqvv

17:50 <fche> thanks richard

17:53 <rth> np

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