linux-kernel - Re: [PATCH] perf test probe_vfs_getname: Correct probe line for updated kernel code

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Message-ID: <20250519083528.GJ412060@e132581.arm.com>
Date: Mon, 19 May 2025 09:35:28 +0100
From: Leo Yan <leo.yan@....com>
To: Arnaldo Carvalho de Melo <acme@...nel.org>
Cc: 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>,
	Athira Rajeev <atrajeev@...ux.vnet.ibm.com>,
	linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] perf test probe_vfs_getname: Correct probe line for
 updated kernel code

On Fri, May 16, 2025 at 03:49:51PM -0300, Arnaldo Carvalho de Melo wrote:
> On Fri, May 16, 2025 at 10:05:32AM +0100, Leo Yan wrote:

[...]

> Well, I'd say we should add, not update, i.e. a new perf should continue
> to work on an older kernel, so please consider the following patch.

The change is fine with me. I sent patch v2 based on the idea.

Thanks a lot for suggestion!

Leo

> - Arnaldo
> 
> diff --git a/tools/perf/tests/shell/lib/probe_vfs_getname.sh b/tools/perf/tests/shell/lib/probe_vfs_getname.sh
> index 89f72a4c818c712b..aa867e28eadc46bc 100644
> --- a/tools/perf/tests/shell/lib/probe_vfs_getname.sh
> +++ b/tools/perf/tests/shell/lib/probe_vfs_getname.sh
> @@ -13,8 +13,17 @@ 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/")
> +		# Please keep the older regexps so that this will pass on older kernels as well
> +		# as in the most recent one.
> +
> +		result_initname_re="[[:space:]]+([[:digit:]]+)[[:space:]]+initname.*"
> +		line=$(perf probe -L getname_flags 2>&1 | grep -E "$result_initname_re" | sed -r "s/$result_initname_re/\1/")
> +
> +		if [ -z "$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/")