perf tools: Add support for PERF_RECORD_TEXT_POKE

Add processing for PERF_RECORD_TEXT_POKE events. When a text poke event
is processed, then the kernel dso data cache is updated with the poked
bytes.

Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Borislav Petkov <bp@alien8.de>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Leo Yan <leo.yan@linaro.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Mathieu Poirier <mathieu.poirier@linaro.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Steven Rostedt (VMware) <rostedt@goodmis.org>
Cc: x86@kernel.org
Link: http://lore.kernel.org/lkml/20200512121922.8997-12-adrian.hunter@intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

1 files changed, 45 insertions, 0 deletions

diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c
index bf1f18366726..b6bdccd875bc 100644
--- a/tools/perf/builtin-record.c
+++ b/tools/perf/builtin-record.c
@@ -765,6 +765,43 @@ static int record__auxtrace_init(struct record *rec __maybe_unused)
 
 #endif
 
+static int record__config_text_poke(struct evlist *evlist)
+{
+	struct evsel *evsel;
+	int err;
+
+	/* Nothing to do if text poke is already configured */
+	evlist__for_each_entry(evlist, evsel) {
+		if (evsel->core.attr.text_poke)
+			return 0;
+	}
+
+	err = parse_events(evlist, "dummy:u", NULL);
+	if (err)
+		return err;
+
+	evsel = evlist__last(evlist);
+
+	evsel->core.attr.freq = 0;
+	evsel->core.attr.sample_period = 1;
+	evsel->core.attr.text_poke = 1;
+	evsel->core.attr.ksymbol = 1;
+
+	evsel->core.system_wide = true;
+	evsel->no_aux_samples = true;
+	evsel->immediate = true;
+
+	/* Text poke must be collected on all CPUs */
+	perf_cpu_map__put(evsel->core.own_cpus);
+	evsel->core.own_cpus = perf_cpu_map__new(NULL);
+	perf_cpu_map__put(evsel->core.cpus);
+	evsel->core.cpus = perf_cpu_map__get(evsel->core.own_cpus);
+
+	evsel__set_sample_bit(evsel, TIME);
+
+	return 0;
+}
+
 static bool record__kcore_readable(struct machine *machine)
 {
 	char kcore[PATH_MAX];
@@ -2766,6 +2803,14 @@ int cmd_record(int argc, const char **argv)
 	if (rec->opts.full_auxtrace)
 		rec->buildid_all = true;
 
+	if (rec->opts.text_poke) {
+		err = record__config_text_poke(rec->evlist);
+		if (err) {
+			pr_err("record__config_text_poke failed, error %d\n", err);
+			goto out;
+		}
+	}
+
 	if (record_opts__config(&rec->opts)) {
 		err = -EINVAL;
 		goto out;