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perf trace: Clarify that -e is about syscalls, not perf events in general
This comes from the desire of having -e/--expr to have the same meaning as for 'strace', while other perf tools use it for --event, which 'trace' honours, i.e. all perf tools have --event in common, but trace uses -e for strace's --expr. Clarify it in the --help output. Reported-by: David Ahern <dsahern@gmail.com> Cc: Adrian Hunter <adrian.hunter@intel.com> Cc: Borislav Petkov <bp@suse.de> Cc: Don Zickus <dzickus@redhat.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Jiri Olsa <jolsa@redhat.com> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Stephane Eranian <eranian@google.com> Link: http://lkml.kernel.org/n/tip-5j94bcsdmcbeu2xthnzsj60d@git.kernel.org Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
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@ -35,7 +35,7 @@ OPTIONS
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-e::
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--expr::
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List of events to show, currently only syscall names.
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List of syscalls to show, currently only syscall names.
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Prefixing with ! shows all syscalls but the ones specified. You may
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need to escape it.
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@ -2660,8 +2660,7 @@ int cmd_trace(int argc, const char **argv, const char *prefix __maybe_unused)
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OPT_BOOLEAN(0, "comm", &trace.show_comm,
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"show the thread COMM next to its id"),
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OPT_BOOLEAN(0, "tool_stats", &trace.show_tool_stats, "show tool stats"),
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OPT_STRING('e', "expr", &ev_qualifier_str, "expr",
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"list of events to trace"),
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OPT_STRING('e', "expr", &ev_qualifier_str, "expr", "list of syscalls to trace"),
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OPT_STRING('o', "output", &output_name, "file", "output file name"),
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OPT_STRING('i', "input", &input_name, "file", "Analyze events in file"),
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OPT_STRING('p', "pid", &trace.opts.target.pid, "pid",
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