Commits
Arnaldo Carvalho de Melo committed acb9f2d4755
perf evsel: Provide meaningful warning when trying to use 'aux_output' on older kernels
Just like we do with the 'write_backwards' feature:
Before:
# perf record -e {intel_pt/branch=0/,cycles/aux-output/ppp} uname
Error:
The sys_perf_event_open() syscall returned with 22 (Invalid argument) for event (cycles/aux-output/ppp).
/bin/dmesg | grep -i perf may provide additional information.
#
After:
# perf record -e {intel_pt/branch=0/,cycles/aux-output/ppp} uname
Error:
The 'aux_output' feature is not supported, update the kernel.
#
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Kan Liang <kan.liang@linux.intel.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: https://lkml.kernel.org/n/tip-wgjsjroe1e150c0metgwmqwd@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>