linux-kernel - Re: [PATCH] perf test: Silence perf check subcommand when not supported

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Message-ID: <f74e73b6-fa0a-4533-a9de-3c5dbc4399f3@linaro.org>
Date: Wed, 11 Sep 2024 14:34:27 +0100
From: James Clark <james.clark@...aro.org>
To: Thomas Richter <tmricht@...ux.ibm.com>, linux-kernel@...r.kernel.org,
 linux-perf-users@...r.kernel.org, acme@...nel.org
Cc: agordeev@...ux.ibm.com, gor@...ux.ibm.com, sumanthk@...ux.ibm.com,
 hca@...ux.ibm.com
Subject: Re: [PATCH] perf test: Silence perf check subcommand when not
 supported



On 11/09/2024 13:28, Thomas Richter wrote:
> Perf subcommand check might not be supported and prints an
> error message when used:

Only in verbose mode though. Personally I don't like all the piping to 
/dev/null in the tests because I have to go and remove them every time a 
test fails, rather than just doing "-v". But as it's pretty much the 
pattern used I suppose we should continue.

> 
>   # perf check feature -q libtraceevent
>   perf: 'check' is not a perf-command. See 'perf --help'.
> 
>   Did you mean one of these?
>          c2c
>          sched
>   #
> 
> Drop this error message, the return code is sufficient.
> 
> Signed-off-by: Thomas Richter <tmricht@...ux.ibm.com>
> ---
>   tools/perf/tests/shell/lib/probe_vfs_getname.sh | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/tools/perf/tests/shell/lib/probe_vfs_getname.sh b/tools/perf/tests/shell/lib/probe_vfs_getname.sh
> index 5c33ec7a5a63..697fbe296a62 100644
> --- a/tools/perf/tests/shell/lib/probe_vfs_getname.sh
> +++ b/tools/perf/tests/shell/lib/probe_vfs_getname.sh
> @@ -32,7 +32,7 @@ skip_if_no_debuginfo() {
>   # check if perf is compiled with libtraceevent support
>   skip_no_probe_record_support() {
>   	if [ $had_vfs_getname -eq 1 ] ; then
> -		perf check feature -q libtraceevent && return 1
> +		perf check feature -q libtraceevent >/dev/null 2>&1 && return 1

There's another of the same in tools/perf/tests/shell/test_task_analyzer.sh

With that:

Reviewed-by: James Clark <james.clark@...aro.org>