linux-kernel - [PATCH v6 7/8] perf: disasm: prefer debugging files in build-id cache

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Message-ID: <20240725021549.880167-8-changbin.du@huawei.com>
Date: Thu, 25 Jul 2024 10:15:48 +0800
From: Changbin Du <changbin.du@...wei.com>
To: Peter Zijlstra <peterz@...radead.org>, Ingo Molnar <mingo@...hat.com>,
	Arnaldo Carvalho de Melo <acme@...nel.org>, Namhyung Kim
	<namhyung@...nel.org>, Nathan Chancellor <nathan@...nel.org>
CC: 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>, "Liang,
 Kan" <kan.liang@...ux.intel.com>, Nick Desaulniers <ndesaulniers@...gle.com>,
	Bill Wendling <morbo@...gle.com>, Justin Stitt <justinstitt@...gle.com>,
	<linux-perf-users@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<llvm@...ts.linux.dev>, Hui Wang <hw.huiwang@...wei.com>, Changbin Du
	<changbin.du@...wei.com>
Subject: [PATCH v6 7/8] perf: disasm: prefer debugging files in build-id cache

The build-id cache might have both debugging and non-debugging files. Here
we prefer the debugging version for annotation.

Cc: Adrian Hunter <adrian.hunter@...el.com>
Signed-off-by: Changbin Du <changbin.du@...wei.com>
---
 tools/perf/util/disasm.c | 29 ++++++++++++++++++-----------
 1 file changed, 18 insertions(+), 11 deletions(-)

diff --git a/tools/perf/util/disasm.c b/tools/perf/util/disasm.c
index 6af9fbec3a95..5f66b3632770 100644
--- a/tools/perf/util/disasm.c
+++ b/tools/perf/util/disasm.c
@@ -1162,18 +1162,25 @@ static int dso__disassemble_filename(struct dso *dso, char *filename, size_t fil
 	    !dso__is_kcore(dso))
 		return SYMBOL_ANNOTATE_ERRNO__NO_VMLINUX;
 
-	build_id_filename = dso__build_id_filename(dso, NULL, 0, false);
-	if (build_id_filename) {
-		__symbol__join_symfs(filename, filename_size, build_id_filename);
-		free(build_id_filename);
-	} else {
-		if (dso__has_build_id(dso))
-			return ENOMEM;
-		return fallback_filename(dso, filename, filename_size);
-	}
+	/* Prefer debugging file if exists, otherwise non-debugging one is used. */
+	for (int i = 0; i < 2; i++) {
+		build_id_filename = dso__build_id_filename(dso, NULL, 0, !i);
+		if (build_id_filename) {
+			__symbol__join_symfs(filename, filename_size, build_id_filename);
+			free(build_id_filename);
+		} else {
+			if (dso__has_build_id(dso))
+				return ENOMEM;
+			return fallback_filename(dso, filename, filename_size);
+		}
 
-	if (access(filename, R_OK))
-		return fallback_filename(dso, filename, filename_size);
+		if (!access(filename, R_OK))
+			break;
+		else if (i != 0) {
+			/* nor debugging or non-debugging is found */
+			return fallback_filename(dso, filename, filename_size);
+		}
+	}
 
 	if (dso__is_kcore(dso) || dso__is_vdso(dso))
 		goto fallback;
-- 
2.34.1