path: root/tools
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authorArnaldo Carvalho de Melo <>2015-04-23 12:02:07 -0300
committerArnaldo Carvalho de Melo <>2015-04-29 10:38:04 -0300
commitd303e85a5c19eb8d913951d1aa81556fc20b20af (patch)
tree209009772af6ecee35aeeba767a7a45f18fa191d /tools
parentfa0e4ffe06f0823abdf6c401c340c08ba8977fad (diff)
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 <> Cc: Adrian Hunter <> Cc: Borislav Petkov <> Cc: Don Zickus <> Cc: Frederic Weisbecker <> Cc: Jiri Olsa <> Cc: Namhyung Kim <> Cc: Stephane Eranian <> Link: Signed-off-by: Arnaldo Carvalho de Melo <>
Diffstat (limited to 'tools')
2 files changed, 2 insertions, 3 deletions
diff --git a/tools/perf/Documentation/perf-trace.txt b/tools/perf/Documentation/perf-trace.txt
index ba03fd5d1a54..1db9c8b79880 100644
--- a/tools/perf/Documentation/perf-trace.txt
+++ b/tools/perf/Documentation/perf-trace.txt
@@ -35,7 +35,7 @@ OPTIONS
- List of events to show, currently only syscall names.
+ List of syscalls to show, currently only syscall names.
Prefixing with ! shows all syscalls but the ones specified. You may
need to escape it.
diff --git a/tools/perf/builtin-trace.c b/tools/perf/builtin-trace.c
index 23fb0818fec9..d1139b6bd534 100644
--- a/tools/perf/builtin-trace.c
+++ b/tools/perf/builtin-trace.c
@@ -2660,8 +2660,7 @@ int cmd_trace(int argc, const char **argv, const char *prefix __maybe_unused)
OPT_BOOLEAN(0, "comm", &trace.show_comm,
"show the thread COMM next to its id"),
OPT_BOOLEAN(0, "tool_stats", &trace.show_tool_stats, "show tool stats"),
- OPT_STRING('e', "expr", &ev_qualifier_str, "expr",
- "list of events to trace"),
+ OPT_STRING('e', "expr", &ev_qualifier_str, "expr", "list of syscalls to trace"),
OPT_STRING('o', "output", &output_name, "file", "output file name"),
OPT_STRING('i', "input", &input_name, "file", "Analyze events in file"),
OPT_STRING('p', "pid", &, "pid",