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05 April 2024, 19:05:47 UTC
Revision 7689bdcab1dca061c4c91f0e1703cef1b7b67e71 authored by Anshuman Khandual on 10 June 2013, 05:53:28 UTC, committed by Benjamin Herrenschmidt on 24 July 2013, 04:42:31 UTC 
powerpc/perf: Ignore separate BHRB privilege state filter request
 
Completely ignore BHRB privilege state filter request as we are
already configuring that with privilege state filtering attribute
for the accompanying PMU event. This would help achieve cleaner
user space interaction for BHRB.

This patch fixes a situation like this

Before patch:-
------------
./perf record -j any -e branch-misses:k ls
Error:
The sys_perf_event_open() syscall returned with 95 (Operation not
supported) for event (branch-misses:k).
/bin/dmesg may provide additional information.
No CONFIG_PERF_EVENTS=y kernel support configured?

Here 'perf record' actually copies over ':k' filter request into BHRB
privilege state filter config and our previous check in kernel would
fail that.

After patch:-
-------------
./perf record -j any -e branch-misses:k ls
perf  perf.data  perf.data.old  test-mmap-ring
[ perf record: Woken up 1 times to write data ]
[ perf record: Captured and wrote 0.002 MB perf.data (~102 samples)]

Signed-off-by: Anshuman Khandual <khandual@linux.vnet.ibm.com>
Acked-by: Michael Neuling <mikey@neuling.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
1 parent 6797500
History
Tip revision: 7689bdcab1dca061c4c91f0e1703cef1b7b67e71 authored by Anshuman Khandual on 10 June 2013, 05:53:28 UTC
powerpc/perf: Ignore separate BHRB privilege state filter request
Tip revision: 7689bdc
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