* hwcache events and kernel/userspace event modifiers - bug?
@ 2016-06-22 14:16 Michael Petlan
0 siblings, 0 replies; only message in thread
From: Michael Petlan @ 2016-06-22 14:16 UTC (permalink / raw)
To: linux-perf-users
Hi,
when using the "k" and "u" event modifiers in order to exclude
kernel or userspace counting, the "hw" events print the modifier
along with the event names in results. When doing the same with
a "hwcache" event, the report shows events without modifiers.
$ perf stat -e cycles:u -e L1-dcache-loads:u -- true
Performance counter stats for 'true':
153,771 cycles:u
24,457 L1-dcache-loads
0.001813975 seconds time elapsed
While "cycles:u" has the ":u" modifier, "L1-dcache-loads" does
not. Despite that, the kernel/userspace excluding seem to work:
$ perf stat -e L1-dcache-loads:u -e L1-dcache-loads:k -e L1-dcache-loads:ku -- ls
Performance counter stats for 'ls':
146,714 L1-dcache-loads
305,080 L1-dcache-loads
451,794 L1-dcache-loads
0.002221714 seconds time elapsed
Where 146714 + 305080 = 451794, so k+u is equal to ku.
This happens with the Arnaldo's latest perf/core perf, the same
as with the others.
Might that be a bug?
Thanks.
Michael
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2016-06-22 14:16 hwcache events and kernel/userspace event modifiers - bug? Michael Petlan
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