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Subject[PATCH 14/41] perf record: Support direct --user-regs arguments
Date
From: Andi Kleen <ak@linux.intel.com>

USER_REGS can currently only collected implicitely with call graph
recording. Sometimes it is useful to see them separately, and filter
them. Add a new --user-regs option to record that is similar to
--intr-regs, but acts on user regs.

Signed-off-by: Andi Kleen <ak@linux.intel.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Link: http://lkml.kernel.org/r/20170905170029.19722-1-andi@firstfloor.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
---
tools/perf/Documentation/perf-record.txt | 2 ++
tools/perf/builtin-record.c | 3 +++
tools/perf/perf.h | 1 +
tools/perf/util/evsel.c | 7 ++++++-
4 files changed, 12 insertions(+), 1 deletion(-)

diff --git a/tools/perf/Documentation/perf-record.txt b/tools/perf/Documentation/perf-record.txt
index e397453e5a46..68a1ffb0a8a5 100644
--- a/tools/perf/Documentation/perf-record.txt
+++ b/tools/perf/Documentation/perf-record.txt
@@ -377,6 +377,8 @@ symbolic names, e.g. on x86, ax, si. To list the available registers use
--intr-regs=\?. To name registers, pass a comma separated list such as
--intr-regs=ax,bx. The list of register is architecture dependent.

+--user-regs::
+Capture user registers at sample time. Same arguments as -I.

--running-time::
Record running and enabled time for read events (:S)
diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c
index 56f8142ff97f..9b379f3a3d99 100644
--- a/tools/perf/builtin-record.c
+++ b/tools/perf/builtin-record.c
@@ -1643,6 +1643,9 @@ static struct option __record_options[] = {
OPT_CALLBACK_OPTARG('I', "intr-regs", &record.opts.sample_intr_regs, NULL, "any register",
"sample selected machine registers on interrupt,"
" use -I ? to list register names", parse_regs),
+ OPT_CALLBACK_OPTARG(0, "user-regs", &record.opts.sample_user_regs, NULL, "any register",
+ "sample selected machine registers on interrupt,"
+ " use -I ? to list register names", parse_regs),
OPT_BOOLEAN(0, "running-time", &record.opts.running_time,
"Record running/enabled time of read (:S) events"),
OPT_CALLBACK('k', "clockid", &record.opts,
diff --git a/tools/perf/perf.h b/tools/perf/perf.h
index dc442ba21bf6..fbb0a9cd0ac6 100644
--- a/tools/perf/perf.h
+++ b/tools/perf/perf.h
@@ -65,6 +65,7 @@ struct record_opts {
unsigned int user_freq;
u64 branch_stack;
u64 sample_intr_regs;
+ u64 sample_user_regs;
u64 default_interval;
u64 user_interval;
size_t auxtrace_snapshot_size;
diff --git a/tools/perf/util/evsel.c b/tools/perf/util/evsel.c
index 4bb89373eb52..7389746c0dc4 100644
--- a/tools/perf/util/evsel.c
+++ b/tools/perf/util/evsel.c
@@ -678,7 +678,7 @@ void perf_evsel__config_callchain(struct perf_evsel *evsel,
if (!function) {
perf_evsel__set_sample_bit(evsel, REGS_USER);
perf_evsel__set_sample_bit(evsel, STACK_USER);
- attr->sample_regs_user = PERF_REGS_MASK;
+ attr->sample_regs_user |= PERF_REGS_MASK;
attr->sample_stack_user = param->dump_size;
attr->exclude_callchain_user = 1;
} else {
@@ -931,6 +931,11 @@ void perf_evsel__config(struct perf_evsel *evsel, struct record_opts *opts,
perf_evsel__set_sample_bit(evsel, REGS_INTR);
}

+ if (opts->sample_user_regs) {
+ attr->sample_regs_user |= opts->sample_user_regs;
+ perf_evsel__set_sample_bit(evsel, REGS_USER);
+ }
+
if (target__has_cpu(&opts->target) || opts->sample_cpu)
perf_evsel__set_sample_bit(evsel, CPU);

--
2.13.5
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