(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 Changes in V2 ------------- (1) Updated the comment section of the code (2) Removed the informational print (3) Updated the commit section of the first patch Changes in V3 ------------- (1) Fixed the compilation warning problem after removing the unused variable 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 | 13 ++++--------- 2 files changed, 8 insertions(+), 10 deletions(-) -- 1.7.11.7 _______________________________________________ Linuxppc-dev mailing list Linuxppc-dev@lists.ozlabs.org https://lists.ozlabs.org/listinfo/linuxppc-dev
