linux-kernel - [PATCH v1] perf inject: Inject build ids for entire call chain

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Message-Id: <20240801031249.176913-1-irogers@google.com>
Date: Wed, 31 Jul 2024 20:12:49 -0700
From: Ian Rogers <irogers@...gle.com>
To: Peter Zijlstra <peterz@...radead.org>, Ingo Molnar <mingo@...hat.com>, 
	Arnaldo Carvalho de Melo <acme@...nel.org>, Namhyung Kim <namhyung@...nel.org>, 
	Mark Rutland <mark.rutland@....com>, 
	Alexander Shishkin <alexander.shishkin@...ux.intel.com>, Jiri Olsa <jolsa@...nel.org>, 
	Ian Rogers <irogers@...gle.com>, Adrian Hunter <adrian.hunter@...el.com>, 
	Kan Liang <kan.liang@...ux.intel.com>, Colin Ian King <colin.i.king@...il.com>, 
	Casey Chen <cachen@...estorage.com>, Tom Zanussi <tzanussi@...il.com>, 
	linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH v1] perf inject: Inject build ids for entire call chain

The DSO build id is injected when the dso is first encountered but the
checking for first encountered only looks at the sample->ip not the
entire callchain. Use the callchain logic to ensure all build ids are
inserted.

Add a for_each callback style API to callchain with
sample__for_each_callchain_node. Possibly in the future such an API
can avoid the overhead of constructing the call chain list.

Fixes: 454c407ec17a ("perf: add perf-inject builtin")
Signed-off-by: Ian Rogers <irogers@...gle.com>
---
 tools/perf/builtin-inject.c | 31 +++++++++++++++++++++++++++++++
 tools/perf/util/callchain.c | 35 +++++++++++++++++++++++++++++++++++
 tools/perf/util/callchain.h |  6 ++++++
 3 files changed, 72 insertions(+)

diff --git a/tools/perf/builtin-inject.c b/tools/perf/builtin-inject.c
index 7b4a5d56d279..ea5f1d57e7e1 100644
--- a/tools/perf/builtin-inject.c
+++ b/tools/perf/builtin-inject.c
@@ -743,6 +743,29 @@ static int dso__inject_build_id(struct dso *dso, struct perf_tool *tool,
 	return 0;
 }
 
+struct mark_dso_hit_args {
+	struct perf_tool *tool;
+	struct machine *machine;
+	u8 cpumode;
+};
+
+static int mark_dso_hit_callback(struct callchain_cursor_node *node, void *data)
+{
+	struct mark_dso_hit_args *args = data;
+	struct map *map = node->ms.map;
+
+	if (map) {
+		struct dso *dso = map__dso(map);
+
+		if (dso && !dso__hit(dso)) {
+			dso__set_hit(dso);
+			dso__inject_build_id(dso, args->tool, args->machine,
+					     args->cpumode, map__flags(map));
+		}
+	}
+	return 0;
+}
+
 int perf_event__inject_buildid(struct perf_tool *tool, union perf_event *event,
 			       struct perf_sample *sample,
 			       struct evsel *evsel __maybe_unused,
@@ -750,6 +773,11 @@ int perf_event__inject_buildid(struct perf_tool *tool, union perf_event *event,
 {
 	struct addr_location al;
 	struct thread *thread;
+	struct mark_dso_hit_args args = {
+		.tool = tool,
+		.machine = machine,
+		.cpumode = sample->cpumode,
+	};
 
 	addr_location__init(&al);
 	thread = machine__findnew_thread(machine, sample->pid, sample->tid);
@@ -769,6 +797,9 @@ int perf_event__inject_buildid(struct perf_tool *tool, union perf_event *event,
 		}
 	}
 
+	sample__for_each_callchain_node(thread, evsel, sample, PERF_MAX_STACK_DEPTH,
+					mark_dso_hit_callback, &args);
+
 	thread__put(thread);
 repipe:
 	perf_event__repipe(tool, event, sample, machine);
diff --git a/tools/perf/util/callchain.c b/tools/perf/util/callchain.c
index 6d075648d2cc..0d608e875fe9 100644
--- a/tools/perf/util/callchain.c
+++ b/tools/perf/util/callchain.c
@@ -1797,3 +1797,38 @@ s64 callchain_avg_cycles(struct callchain_node *cnode)
 
 	return cycles;
 }
+
+int sample__for_each_callchain_node(struct thread *thread, struct evsel *evsel,
+				    struct perf_sample *sample, int max_stack,
+				    callchain_iter_fn cb, void *data)
+{
+	struct callchain_cursor *cursor = get_tls_callchain_cursor();
+	int ret;
+
+	if (!cursor)
+		return -ENOMEM;
+
+	/* Fill in the callchain. */
+	ret = thread__resolve_callchain(thread, cursor, evsel, sample,
+					/*parent=*/NULL, /*root_al=*/NULL,
+					max_stack);
+	if (ret)
+		return ret;
+
+	/* Switch from writing the callchain to reading it. */
+	callchain_cursor_commit(cursor);
+
+	while (1) {
+		struct callchain_cursor_node *node = callchain_cursor_current(cursor);
+
+		if (!node)
+			break;
+
+		ret = cb(node, data);
+		if (ret)
+			return ret;
+
+		callchain_cursor_advance(cursor);
+	}
+	return 0;
+}
diff --git a/tools/perf/util/callchain.h b/tools/perf/util/callchain.h
index d5c66345ae31..76891f8e2373 100644
--- a/tools/perf/util/callchain.h
+++ b/tools/perf/util/callchain.h
@@ -311,4 +311,10 @@ u64 callchain_total_hits(struct hists *hists);
 
 s64 callchain_avg_cycles(struct callchain_node *cnode);
 
+typedef int (*callchain_iter_fn)(struct callchain_cursor_node *node, void *data);
+
+int sample__for_each_callchain_node(struct thread *thread, struct evsel *evsel,
+				    struct perf_sample *sample, int max_stack,
+				    callchain_iter_fn cb, void *data);
+
 #endif	/* __PERF_CALLCHAIN_H */
-- 
2.46.0.rc2.264.g509ed76dc8-goog