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perf trace: Warn the user when not available

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When the audit-libs devel package is not found at build time we disable
the 'trace' command, as we are not able to map syscall numbers to
strings, but then the message the user is presented is cryptic:

  [root@zoo linux]# trace ls
  perf: 'ls' is not a perf-command. See 'perf --help'.

Fix it by presenting a more helpful message:

  [root@zoo linux]# trace l
  trace command not available: missing audit-libs devel package at build time.

Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Don Zickus <dzickus@redhat.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Link: http://lkml.kernel.org/n/tip-uxeunqetd0sgxyibusapen9a@git.kernel.org
Signed-off-by: Jiri Olsa <jolsa@kernel.org>
This commit is contained in:
Arnaldo Carvalho de Melo 2014-05-26 16:02:29 -03:00 committed by Jiri Olsa
parent 9b261365dd
commit 1b5726220f
1 changed files with 6 additions and 2 deletions
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8
tools/perf/perf.c
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@ -481,14 +481,18 @@ int main(int argc, const char **argv)
fprintf(stderr, "cannot handle %s internally", cmd);
goto out;
}
#ifdef HAVE_LIBAUDIT_SUPPORT
if (!prefixcmp(cmd, "trace")) {
#ifdef HAVE_LIBAUDIT_SUPPORT
set_buildid_dir();
setup_path();
argv[0] = "trace";
return cmd_trace(argc, argv, NULL);
}
#else
fprintf(stderr,
"trace command not available: missing audit-libs devel package at build time.\n");
goto out;
#endif
}
/* Look for flags.. */
argv++;
argc--;