• J
    perf tools: Add parse_events_error interface · b39b8393
    Jiri Olsa 提交于
    Adding support to return error information from parse_events function.
    Following struct will be populated by parse_events function on return:
    
      struct parse_events_error {
        int   idx;
        char *str;
        char *help;
      };
    
    where 'idx' is the position in the string where the parsing failed,
    'str' contains dynamically allocated error string describing the error
    and 'help' is optional help string.
    
    The change contains reporting function, which currently does not display
    anything. The code changes to supply error data for specific event types
    are coming in next patches. However this is what the expected output is:
    
      $ sudo perf record -e 'sched:krava' ls
      event syntax error: 'sched:krava'
                           \___ unknown tracepoint
      ...
    
      $ perf record -e 'cpu/even=0x1/' ls
      event syntax error: 'cpu/even=0x1/'
                               \___ unknown term
    
      valid terms: pc,any,inv,edge,cmask,event,in_tx,ldlat,umask,in_tx_cp,offcore_rsp,config,config1,config2,name,period,branch_type
      ...
    
      $ perf record -e cycles,cache-mises ls
      event syntax error: '..es,cache-mises'
                                     \___ parser error
      ...
    
    The output functions cut the beginning of the event string so the error
    starts up to 10th character and cut the end of the string of it crosses
    the terminal width.
    Signed-off-by: NJiri Olsa <jolsa@kernel.org>
    Cc: David Ahern <dsahern@gmail.com>
    Cc: Namhyung Kim <namhyung@kernel.org>
    Cc: Paul Mackerras <paulus@samba.org>
    Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
    Link: http://lkml.kernel.org/r/1429729824-13932-2-git-send-email-jolsa@kernel.org
    [ Renamed 'error' variables to 'err', not to clash with util.h error() ]
    Signed-off-by: NArnaldo Carvalho de Melo <acme@redhat.com>
    b39b8393
parse-events.c 35.9 KB