• David Ahern's avatar
    perf stat: handle ENXIO error for perf_event_open · 979987a5
    David Ahern authored
    perf stat on PPC currently fails to run:
    
    $ perf stat -- sleep 1
      Error: open_counter returned with 6 (No such device or address). /bin/dmesg may provide additional information.
    
      Fatal: Not all events could be opened.
    
    The problem is that until 2.6.37 (behavior changed with commit b0a873eb)
    perf on PPC returns ENXIO when hw_perf_event_init() fails. With this
    patch we get the expected behavior:
    
    $ perf stat -v -- sleep 1
    cycles event is not supported by the kernel.
    stalled-cycles-frontend event is not supported by the kernel.
    stalled-cycles-backend event is not supported by the kernel.
    instructions event is not supported by the kernel.
    branches event is not supported by the kernel.
    branch-misses event is not supported by the kernel.
    
    ...
    Signed-off-by: default avatarDavid Ahern <dsahern@gmail.com>
    Cc: Peter Zijlstra <peterz@infradead.org>
    Link: http://lkml.kernel.org/r/1336490956-57145-1-git-send-email-dsahern@gmail.comSigned-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
    979987a5
builtin-stat.c 33.1 KB