linux-kernel - [PATCH 19/52] perf report: Support data type profiling

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Date:   Thu,  9 Nov 2023 15:59:38 -0800
From:   Namhyung Kim <namhyung@...nel.org>
To:     Arnaldo Carvalho de Melo <acme@...nel.org>,
        Jiri Olsa <jolsa@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>
Cc:     Ian Rogers <irogers@...gle.com>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Ingo Molnar <mingo@...nel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        linux-perf-users@...r.kernel.org,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Stephane Eranian <eranian@...gle.com>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Andi Kleen <ak@...ux.intel.com>,
        linux-trace-devel@...r.kernel.org, linux-toolchains@...r.kernel.org
Subject: [PATCH 19/52] perf report: Support data type profiling

Enable type annotation when the 'type' sort key is used.
It shows type of variables the samples access at the moment.
Users can see which types are accessed frequently.

  $ perf report -s dso,type --stdio
  ...
  # Overhead  Shared Object      Data Type
  # ........  .................  .........
  #
      35.47%  [kernel.kallsyms]  (unknown)
       1.62%  [kernel.kallsyms]  struct sched_entry
       1.23%  [kernel.kallsyms]  struct cfs_rq
       0.83%  [kernel.kallsyms]  struct task_struct
       0.34%  [kernel.kallsyms]  struct list_head
       0.30%  [kernel.kallsyms]  struct mem_cgroup
  ...

Signed-off-by: Namhyung Kim <namhyung@...nel.org>
---
 tools/perf/builtin-report.c | 21 ++++++++++++++++++---
 1 file changed, 18 insertions(+), 3 deletions(-)

diff --git a/tools/perf/builtin-report.c b/tools/perf/builtin-report.c
index 121a2781323c..cd2cefd1ea9a 100644
--- a/tools/perf/builtin-report.c
+++ b/tools/perf/builtin-report.c
@@ -96,6 +96,7 @@ struct report {
 	bool			stitch_lbr;
 	bool			disable_order;
 	bool			skip_empty;
+	bool			data_type;
 	int			max_stack;
 	struct perf_read_values	show_threads_values;
 	struct annotation_options annotation_opts;
@@ -171,7 +172,7 @@ static int hist_iter__report_callback(struct hist_entry_iter *iter,
 	struct mem_info *mi;
 	struct branch_info *bi;
 
-	if (!ui__has_annotation() && !rep->symbol_ipc)
+	if (!ui__has_annotation() && !rep->symbol_ipc && !rep->data_type)
 		return 0;
 
 	if (sort__mode == SORT_MODE__BRANCH) {
@@ -323,10 +324,19 @@ static int process_sample_event(struct perf_tool *tool,
 	if (al.map != NULL)
 		map__dso(al.map)->hit = 1;
 
-	if (ui__has_annotation() || rep->symbol_ipc || rep->total_cycles_mode) {
+	if (ui__has_annotation() || rep->symbol_ipc || rep->total_cycles_mode ||
+	    rep->data_type) {
 		hist__account_cycles(sample->branch_stack, &al, sample,
 				     rep->nonany_branch_mode,
 				     &rep->total_cycles);
+		if (rep->data_type) {
+			struct symbol *sym = al.sym;
+			struct annotation *notes = sym ? symbol__annotation(sym) : NULL;
+
+			/* XXX: Save annotate options here */
+			if (notes)
+				notes->options = &rep->annotation_opts;
+		}
 	}
 
 	ret = hist_entry_iter__add(&iter, &al, rep->max_stack, rep);
@@ -1622,6 +1632,11 @@ int cmd_report(int argc, const char **argv)
 			sort_order = NULL;
 	}
 
+	if (sort_order && strstr(sort_order, "type")) {
+		report.data_type = true;
+		report.annotation_opts.annotate_src = false;
+	}
+
 	if (strcmp(input_name, "-") != 0)
 		setup_browser(true);
 	else
@@ -1680,7 +1695,7 @@ int cmd_report(int argc, const char **argv)
 	 * so don't allocate extra space that won't be used in the stdio
 	 * implementation.
 	 */
-	if (ui__has_annotation() || report.symbol_ipc ||
+	if (ui__has_annotation() || report.symbol_ipc || report.data_type ||
 	    report.total_cycles_mode) {
 		ret = symbol__annotation_init();
 		if (ret < 0)
-- 
2.42.0.869.gea05f2083d-goog