[PATCH RFC 2/3] perf/record: add options --off-cpu-kernel

[Ajay Kaher]

--off-cpu-kernel to collect off cpu samples using on/off cpu time.

Signed-off-by: Ajay Kaher <ajay.kaher@xxxxxxxxxxxx>

---
 tools/perf/builtin-record.c | 2 ++
 tools/perf/util/evsel.c     | 2 ++
 tools/perf/util/record.h    | 1 +
 3 files changed, 5 insertions(+)

diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c
index 0a8ba1323d64..5be172537330 100644
--- a/tools/perf/builtin-record.c
+++ b/tools/perf/builtin-record.c
@@ -3571,6 +3571,8 @@ static struct option __record_options[] = {
 			    "write collected trace data into several data files using parallel threads",
 			    record__parse_threads),
 	OPT_BOOLEAN(0, "off-cpu", &record.off_cpu, "Enable off-cpu analysis"),
+	OPT_BOOLEAN(0, "off-cpu-kernel", &record.opts.off_cpu_kernel,
+		    "Enable kernel based off-cpu analysis"),
 	OPT_END()
 };
 
diff --git a/tools/perf/util/evsel.c b/tools/perf/util/evsel.c
index 4f818ab6b662..8ba890a5ac6e 100644
--- a/tools/perf/util/evsel.c
+++ b/tools/perf/util/evsel.c
@@ -862,6 +862,8 @@ static void __evsel__config_callchain(struct evsel *evsel, struct record_opts *o
 		attr->exclude_callchain_user = 1;
 	if (opts->user_callchains)
 		attr->exclude_callchain_kernel = 1;
+	if (opts->off_cpu_kernel)
+		attr->off_cpu = 1;
 	if (param->record_mode == CALLCHAIN_LBR) {
 		if (!opts->branch_stack) {
 			if (attr->exclude_user) {
diff --git a/tools/perf/util/record.h b/tools/perf/util/record.h
index a6566134e09e..cfa5e34b78ad 100644
--- a/tools/perf/util/record.h
+++ b/tools/perf/util/record.h
@@ -52,6 +52,7 @@ struct record_opts {
 	bool	      kcore;
 	bool	      text_poke;
 	bool	      build_id;
+	bool	      off_cpu_kernel;
 	unsigned int  freq;
 	unsigned int  mmap_pages;
 	unsigned int  auxtrace_mmap_pages;
-- 
2.39.0