Hey Jonathan, On the machine with zeroes in results for perf counters, there is no lttng modules. Is it proper behavior then?
On Fri, Jul 25, 2014 at 11:33 PM, Evgeniy Ivanov <i...@eivanov.com> wrote: > Hey Jonathan, > > Thanks a lot for help! I think I've found the reason of invalid context > messages: I reran root's lttng-sessiond, but didn't check sessions for my > user (since I've done 'destroy -a'). Today again I got issue with invalid > context and noticed, that there are two pairs of lttng-sessiond > and lttng-consumerd: from old version and from new version according dates. > Old one is from July 7, which is surprising, since I often do "destroy -a". > After killing everything seems to work. Btw, it's Oracle linux 6.5 with > linux 3.8. > > I'll check that zeros after weekend: I don't have own access to that > machine. > > > > > On Fri, Jul 25, 2014 at 1:07 AM, Jonathan Rajotte-Julien < > jonathan.rajotte-jul...@ericsson.com> wrote: > >> >> >> On 07/24/2014 04:46 PM, Jonathan Rajotte-Julien wrote: >> > >> > Hey Evgeniy, >> > >> > >> >> Jonathan, sorry, I've copied wrong output, original command was with >> perf:thread:cpu-cycles: >> >> >> >>> lttng add-context -u -t vpid -t perf:thread:cpu-cycles -t >> perf:thread:instructions -t perf:thread:cache-misses >> >> Session auto-20140724-091524 created. >> >> Traces will be written in >> /export/home/eiva/lttng-traces/auto-20140724-091524 >> >> UST context vpid added to all channels >> >> Error: perf:thread:cpu-cycles: UST invalid context >> >> Error: perf:thread:instructions: UST invalid context >> >> Error: perf:thread:cache-misses: UST invalid context >> >> Warning: Some command(s) went wrong >> >> UST event eiva_test:* created in channel channel0 >> > >> > Weird, it works on my side (c&p) with latest version witch is 2.5 >> stable :P. >> >> I just tested a fresh install from stable ppa ( >> https://launchpad.net/~lttng/+archive/ubuntu/ppa). >> >> and everything seems to work fine. Cycle,cache etc. >> >> Well, keep us up to date. >> >> Cheers >> Jonathan >> >> > >> >> >> >>> lttng --version >> >> lttng (LTTng Trace Control) 2.5.0 - Fumisterie >> > >> > From this output I guess you are working with the lttng package and not >> the source from git. I don't think packaging is the problem here but let >> just keep that in mind. >> > What dist are you on ? >> > >> > I'm sure you already done it a thousand time but could you just run >> these and send the output ? >> > >> > First make sure no lttng-sessiond is running then launch: >> > >> > lttng-sessiond -vvv >> > >> > In a separate terminal: >> > >> > lttng destroy -a // Just in case >> > lttng -vvv create test >> > >> > lttng -vvv add-context -u -t vpid -t perf:thread:cpu-cycles -t >> perf:thread:instructions -t perf:thread:cache-misses >> > >> > If this work, you could test if you get the data or zero. >> > >> > lttng enable-event -u -a -s test >> > >> > lttng start >> > // Run the program >> > >> > lttng stop >> > >> > Make sure to send the output from lttng-sessiond -vvv. >> > >> > >> > Cheers, >> > Jonathan >> > >> >> >> >> Later I've tried cpu-cycles separately and then accidentally switched >> to perf:cpu. Now everything started to work, but nothing changed since >> then. Though didn't check if we still get zeroes on another machine. >> >> >> >> >> >> On Thu, Jul 24, 2014 at 7:01 PM, Jonathan Rajotte-Julien < >> jonathan.rajotte-jul...@ericsson.com <mailto: >> jonathan.rajotte-jul...@ericsson.com>> wrote: >> >> >> >> Hi! >> >> >> >> > Hi! >> >> > >> >> > I use lttng-2.5.0 (tools, modules, …) and linux-3.8.13. When I >> try to add context for performance counters I get the following error: >> >> > >> >> >> lttng add-context -u -t perf:cpu:cpu-cycles >> >> > Error: perf:cpu:cpu-cycles: UST invalid context >> >> > Warning: Some command(s) went wrong >> >> >> >> Well i think we will both agree that the help page does not help >> very much.(Should fix that) >> >> >> >> If we go deep down into the code we get the supported context for >> UST domain. :) >> >> >> >> Ust domain support 6 type of context: >> >> LTTNG_EVENT_CONTEXT_VTID >> >> LTTNG_EVENT_CONTEXT_VPID >> >> LTTNG_UST_CONTEXT_VPID >> >> LTTNG_EVENT_CONTEXT_PTHREAD_ID >> >> LTTNG_EVENT_CONTEXT_PROCNAME >> >> LTTNG_EVENT_CONTEXT_IP >> >> LTTNG_EVENT_CONTEXT_PERF_THREAD_COUNTER >> >> >> >> Well this does help a little ... If we dig a little deeper and >> search around we get more info and see that an enum from >> "./lttng-tools/include/lttng/event.h" lttng_event_context_t maps to another >> one in the lttng-tool side ( context_type in add_context.c) >> >> >> >> *Important Part* >> >> So if we decrypt the macros and functions in add-context.c, we get >> that the following contexts are supported for UST: >> >> >> >> vpid >> >> vtid >> >> pthread_id >> >> procname >> >> ip >> >> >> >> perf:thread:cpu-cycles >> >> perf:thread:cycles >> >> perf:thread:stalled-cycles-frontend >> >> perf:thread:idle-cycles-frontend >> >> perf:thread:stalled-cycles-backend >> >> perf:thread:idle-cycles-backend >> >> perf:thread:instructions >> >> perf:thread:cache-references >> >> perf:thread:cache-misses >> >> perf:thread:branch-instructions >> >> perf:thread:branches >> >> perf:thread:branch-misses >> >> perf:thread:bus-cycles >> >> >> >> perf:thread:L1-dcache >> >> perf:thread:L1-icache >> >> perf:thread:LLC >> >> perf:thread:dTLB >> >> perf:thread:iTLB-loads >> >> perf:thread:iTLB-load-misses >> >> perf:thread:branch-loads >> >> perf:thread:branch-load-misses >> >> >> >> perf:thread:cpu-clock >> >> perf:thread:task-clock >> >> perf:thread:page-fault >> >> perf:thread:faults >> >> perf:thread:major-faults >> >> perf:thread:minor-faults >> >> perf:thread:context-switches >> >> perf:thread:cs >> >> perf:thread:cpu-migrations >> >> perf:thread:migrations >> >> perf:thread:alignment-faults >> >> perf:thread:emulation-faults >> >> >> >> **(TL;DR : perf:cpu:cpu-cycles is not in the list)** >> >> >> >> If you want perf:cpu:cpu-cycles you will need a kernel tracing >> domain. >> >> >> >> Even if it make sense that a ust tracing session cannot touch >> hardware stuff it won’t hurt to be more explicit about it. :). >> >> >> >> > >> >> > We have another machine with 2.5.0 (modules are not installed >> though) and adding perf:cpu:cpu-cycles works fine, but it is always zero in >> results. >> >> >> >> As for this, I cannot explain why lttng-tool does not complain on >> adding the context. >> >> You can open a bug here http://bugs.lttng.org/projects/lttng-tools >> (you will need to create an account and sign in) >> >> >> >> Cheers, >> >> Jonathan >> >> >> >> > >> >> > -- >> >> > Cheers, >> >> > Evgeniy >> >> > >> >> > >> >> > _______________________________________________ >> >> > lttng-dev mailing list >> >> > lttng-dev@lists.lttng.org <mailto:lttng-dev@lists.lttng.org> >> >> > http://lists.lttng.org/cgi-bin/mailman/listinfo/lttng-dev >> >> > >> >> >> >> >> >> >> >> >> >> -- >> >> Cheers, >> >> Evgeniy >> > >> > >> > _______________________________________________ >> > lttng-dev mailing list >> > lttng-dev@lists.lttng.org >> > http://lists.lttng.org/cgi-bin/mailman/listinfo/lttng-dev >> > >> >> >> _______________________________________________ >> lttng-dev mailing list >> lttng-dev@lists.lttng.org >> http://lists.lttng.org/cgi-bin/mailman/listinfo/lttng-dev >> > > > > -- > Cheers, > Evgeniy > -- Cheers, Evgeniy
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