• Arnaldo Carvalho de Melo's avatar
    perf trace beauty: Use the autogenerated protocol family table · f3cf7fa9
    Arnaldo Carvalho de Melo authored
    That helps us not to lose new protocol families when they are
    introduced, replacing that hardcoded, dated family->string table.
    
    To recap what this allows us to do:
    
      # perf trace -e syscalls:sys_enter_socket/max-stack=10/ --filter=family==INET --max-events=1
         0.000 fetchmail/41097 syscalls:sys_enter_socket(family: INET, type: DGRAM|CLOEXEC|NONBLOCK, protocol: IP)
                                           __GI___socket (inlined)
                                           reopen (/usr/lib64/libresolv-2.31.so)
                                           send_dg (/usr/lib64/libresolv-2.31.so)
                                           __res_context_send (/usr/lib64/libresolv-2.31.so)
                                           __GI___res_context_query (inlined)
                                           __GI___res_context_search (inlined)
                                           _nss_dns_gethostbyname4_r (/usr/lib64/libnss_dns-2.31.so)
                                           gaih_inet.constprop.0 (/usr/lib64/libc-2.31.so)
                                           __GI_getaddrinfo (inlined)
                                           [0x15cb2] (/usr/bin/fetchmail)
      #
    
    More work is still needed to allow for the more natura strace-like
    syscall name usage instead of the trace event name:
    
      # perf trace -e socket/max-stack=10,family==INET/ --max-events=1
    
    I.e. to allow for modifiers to follow the syscall name and for logical
    expressions to be accepted as filters to use with that syscall, be it as
    trace event filters or BPF based ones.
    
    Using -v we can see how the trace event filter is built:
    
      # perf trace -v -e syscalls:sys_enter_socket/call-graph=dwarf/ --filter=family==INET --max-events=2
      <SNIP>
      New filter for syscalls:sys_enter_socket: (family==0x2) && (common_pid != 41384 && common_pid != 2836)
      <SNIP>
    
      $ tools/perf/trace/beauty/socket.sh | grep -w 2
    	[2] = "INET",
      $
    
    Cc: Adrian Hunter <adrian.hunter@intel.com>
    Cc: Jiri Olsa <jolsa@kernel.org>
    Cc: Namhyung Kim <namhyung@kernel.org>
    Cc: Steven Rostedt <rostedt@goodmis.org>
    Signed-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
    f3cf7fa9
Makefile.perf 36.9 KB