Commit-ID: 726f3234dd125633438922a07a80f933f13daf82
Gitweb: http://git.kernel.org/tip/726f3234dd125633438922a07a80f933f13daf82
Author: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
AuthorDate: Fri, 6 Feb 2015 10:16:45 +0100
Committer: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
CommitDate: Fri, 13 Feb 2015 17:30:29 -0300
perf trace: Support --events foo:bar --no-syscalls
I.e. support tracing just tracepoints, without strace like
raw_syscalls:*.
[acme@ssdandy linux]$ trace --no-sys --ev sched:*exec,sched:*switch,sched:*exit usleep 1
0.048 ( ): sched:sched_process_exec:filename=/usr/bin/usleep pid=27298 old_pid=27298)
0.369 ( ): sched:sched_switch:usleep:27298 [120] S ==> swapper/5:0 [120])
0.452 ( ): sched:sched_process_exit:comm=usleep pid=27298 prio=120)
[acme@ssdandy linux]$
TODO: remove that (...) thing when --no-syscalls is specified.
Cc: Adrian Hunter <adrian.hunter@xxxxxxxxx>
Cc: Borislav Petkov <bp@xxxxxxx>
Cc: David Ahern <dsahern@xxxxxxxxx>
Cc: Don Zickus <dzickus@xxxxxxxxxx>
Cc: Frederic Weisbecker <fweisbec@xxxxxxxxx>
Cc: Jiri Olsa <jolsa@xxxxxxxxxx>
Cc: Mike Galbraith <efault@xxxxxx>
Cc: Namhyung Kim <namhyung@xxxxxxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Cc: Stephane Eranian <eranian@xxxxxxxxxx>
Link: http://lkml.kernel.org/n/tip-vn0hsixsbhm31b2rpj97r96k@xxxxxxxxxxxxxx
Signed-off-by: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
---
tools/perf/builtin-trace.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/tools/perf/builtin-trace.c b/tools/perf/builtin-trace.c
index a44ac93..b1c1df9 100644
--- a/tools/perf/builtin-trace.c
+++ b/tools/perf/builtin-trace.c
@@ -2625,7 +2625,8 @@ int cmd_trace(int argc, const char **argv, const char *prefix __maybe_unused)
if (trace.summary_only)
trace.summary = trace.summary_only;
- if (!trace.trace_syscalls && !trace.trace_pgfaults) {
+ if (!trace.trace_syscalls && !trace.trace_pgfaults &&
+ trace.evlist->nr_entries == 0 /* Was --events used? */) {
pr_err("Please specify something to trace.\n");
return -1;
}
--
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