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
<[email protected]> 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
<[email protected]> wrote:
----- On Nov 17, 2015, at 4:46 PM, Hani Nemati <[email protected]> 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 / >>>>>>>>
_______________________________________________
lttng-dev mailing list
[email protected]
http://lists.lttng.org/cgi-bin/mailman/listinfo/lttng-dev
--
Mathieu Desnoyers
EfficiOS Inc.
http://www.efficios.com
_______________________________________________
lttng-dev mailing list
[email protected]
http://lists.lttng.org/cgi-bin/mailman/listinfo/lttng-dev
