linux-kernel - [PATCH v2] perf test probe_vfs_getname: Add regex for searching probe line

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Message-Id: <20250519082755.1669187-1-leo.yan@arm.com>
Date: Mon, 19 May 2025 09:27:55 +0100
From: Leo Yan <leo.yan@....com>
To: Arnaldo Carvalho de Melo <acme@...nel.org>,
	Namhyung Kim <namhyung@...nel.org>,
	Jiri Olsa <jolsa@...nel.org>,
	Ian Rogers <irogers@...gle.com>,
	Adrian Hunter <adrian.hunter@...el.com>,
	"Liang, Kan" <kan.liang@...ux.intel.com>,
	Jakub Brnak <jbrnak@...hat.com>,
	linux-perf-users@...r.kernel.org,
	linux-kernel@...r.kernel.org
Cc: Leo Yan <leo.yan@....com>
Subject: [PATCH v2] perf test probe_vfs_getname: Add regex for searching probe line

Since commit 611851010c74 ("fs: dedup handling of struct filename init
and refcounts bumps"), the kernel has been refactored to use a new
inline function initname(), moving name initialization into it.

As a result, the perf probe test can no longer find the source line that
matches the defined regular expressions. This causes the script to fail
when attempting to add probes.

Add a regular expression to search for the call site of initname(). This
provides a valid source line number for adding the probe. Keeps the
older regular expressions for passing test on older kernels.

Suggested-by: Arnaldo Carvalho de Melo <acme@...nel.org>
Fixes: 611851010c74 ("fs: dedup handling of struct filename init and refcounts bumps")
Signed-off-by: Leo Yan <leo.yan@....com>
---

Changes from v1:
- Keep old regexps to be compatible with older kernels (Arnaldo)

 tools/perf/tests/shell/lib/probe_vfs_getname.sh | 12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)

diff --git a/tools/perf/tests/shell/lib/probe_vfs_getname.sh b/tools/perf/tests/shell/lib/probe_vfs_getname.sh
index 89f72a4c818c..58debce9ab42 100644
--- a/tools/perf/tests/shell/lib/probe_vfs_getname.sh
+++ b/tools/perf/tests/shell/lib/probe_vfs_getname.sh
@@ -13,8 +13,16 @@ cleanup_probe_vfs_getname() {
 add_probe_vfs_getname() {
 	add_probe_verbose=$1
 	if [ $had_vfs_getname -eq 1 ] ; then
-		result_filename_re="[[:space:]]+([[:digit:]]+)[[:space:]]+result->uptr.*"
-		line=$(perf probe -L getname_flags 2>&1 | grep -E "$result_filename_re" | sed -r "s/$result_filename_re/\1/")
+		result_initname_re="[[:space:]]+([[:digit:]]+)[[:space:]]+initname.*"
+		line=$(perf probe -L getname_flags 2>&1 | grep -E "$result_initname_re" | sed -r "s/$result_initname_re/\1/")
+
+		# Search the old regular expressions so that this will
+		# pass on older kernels as well.
+		if [ -z "$line" ] ; then
+			result_filename_re="[[:space:]]+([[:digit:]]+)[[:space:]]+result->uptr.*"
+			line=$(perf probe -L getname_flags 2>&1 | grep -E "$result_filename_re" | sed -r "s/$result_filename_re/\1/")
+		fi
+
 		if [ -z "$line" ] ; then
 			result_aname_re="[[:space:]]+([[:digit:]]+)[[:space:]]+result->aname = NULL;"
 			line=$(perf probe -L getname_flags 2>&1 | grep -E "$result_aname_re" | sed -r "s/$result_aname_re/\1/")
-- 
2.34.1