[PATCH 0/2] Improvement and fixes for BHRB

[Anshuman Khandual]

(1) The first 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) ]

(2) The second patch fixes context migration for BHRB filter configuration

Anshuman Khandual (2):
  powerpc, perf: Ignore separate BHRB privilege state filter request
  powerpc, perf: BHRB filter configuration should follow the task

 arch/powerpc/perf/core-book3s.c |  5 ++++-
 arch/powerpc/perf/power8-pmu.c  | 17 +++++++++--------
 2 files changed, 13 insertions(+), 9 deletions(-)

-- 
1.7.11.7

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/