[lttng-dev] Lttng add-context perf commands gives me error

[Mathieu Desnoyers]

Hi, 

Passing raw pmc identifiers is not supported at the moment. This is a feature we 
would like to add to lttng next year. 

Thanks, 

Mathieu 

----- On Nov 19, 2015, at 10:37 AM, Hani Nemati <hani_nemati at yahoo.com> wrote: 

> Hi Mathieu ,
> LCC is last level cache and it is shared between CPU cores. Also, I was running
> several VMs in background. That's why I used sleep command.
> Based on Intel's manual r0109 is raw identifier for LCC-load-misses,
> The question is how can I fix the problem since Lttng is using perf symbolic
> name.

> Thanks,
> Hani

> On Wednesday, November 18, 2015 3:19 PM, Hani Nemati <hani_nemati at yahoo.com>
> wrote:

> There is no PERF symbolic name for LLC-load-misses but I can use raw identifier
> to find out Number of code read, data read that miss the LLC. Here is the
> command that I used.

> #perf stat -e r0109 sleep 2
> Performance counter stats for 'sleep 2':

> 117 r0109

> Do you have any idea why I don't have the symbolic name? Is there any way to
> give raw identifier instead of perf:cpu:LLC-load-misses?

> On Wednesday, November 18, 2015 9:45 AM, Mathieu Desnoyers
> <mathieu.desnoyers at efficios.com> wrote:

> ----- On Nov 17, 2015, at 4:46 PM, Hani Nemati <hani_nemati at yahoo.com> wrote:

>> Hi,
>> I am trying to count last level cache misses by using lttng add-context command.
>> I use add-context to add perf:cpu:LLC-load-misses to my channel but I see an
>> error. There is no error for other perf events. Just two perf events including
>> perf:cpu:LLC-load-misses and perf:cpu:LLC-store-misses give me the following
>> error:
>> Error: perf:cpu:LLC-load-misses: Add kernel context failed
>> Warning: Some command(s) went wrong

>> Here is result of "uname -a" on my computer:
>> Linux nemati 3.16.0-51-generic #69~14.04.1-Ubuntu SMP Wed Oct 7 15:32:41 UTC
>> 2015 x86_64 x86_64 x86_64 GNU/Linux

>> Here is the command that I used:
>> #lttng enable-channel -k test
>> #Kernel channel test enabled for session hh
>> #lttng add-context -k -t perf:cpu:LLC-load-misses -c test
>> Error: perf:cpu:LLC-load-misses: Add kernel context failed
>> Warning: Some command(s) went wrong

>> I also tried it on other machines.

> It is possible that your architecture does not expose this counter to perf.
> Did you try using this PMC with the perf tool ?

> Thanks,

> Mathieu

>> <<<<<<<
>> /-/ /\ /\/ / /\/ E /\/\ /\ T
>> / >>>>>>>>

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> --
> Mathieu Desnoyers
> EfficiOS Inc.
> http://www.efficios.com

-- 
Mathieu Desnoyers 
EfficiOS Inc. 
http://www.efficios.com 
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