linux-kernel - Re: [PATCH v6 12/21] selftests/resctrl: Check for resctrl mount point only if resctrl FS is supported

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Message-ID: <b25fa4eb-803c-dc44-421a-080668c54aff@linuxfoundation.org>
Date:   Fri, 2 Apr 2021 13:48:04 -0600
From:   Shuah Khan <skhan@...uxfoundation.org>
To:     Fenghua Yu <fenghua.yu@...el.com>, Shuah Khan <shuah@...nel.org>,
        Tony Luck <tony.luck@...el.com>,
        Reinette Chatre <reinette.chatre@...el.com>,
        Babu Moger <babu.moger@....com>,
        Ravi V Shankar <ravi.v.shankar@...el.com>,
        Shuah Khan <skhan@...uxfoundation.org>
Cc:     linux-kselftest <linux-kselftest@...r.kernel.org>,
        linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v6 12/21] selftests/resctrl: Check for resctrl mount point
 only if resctrl FS is supported

On 3/16/21 8:22 PM, Fenghua Yu wrote:
> check_resctrlfs_support() does the following
> 1. Checks if the platform supports resctrl file system or not by looking
>     for resctrl in /proc/filesystems
> 2. Calls opendir() on default resctrl file system path
>     (i.e. /sys/fs/resctrl)
> 3. Checks if resctrl file system is mounted or not by looking at
>     /proc/mounts
> 
> Steps 2 and 3 will fail if the platform does not support resctrl file
> system. So, there is no need to check for them if step 1 fails.
> 
> Fix this by returning immediately if the platform does not support
> resctrl file system.
> 
> Tested-by: Babu Moger <babu.moger@....com>
> Signed-off-by: Fenghua Yu <fenghua.yu@...el.com>
> ---
>   tools/testing/selftests/resctrl/resctrlfs.c | 3 +++
>   1 file changed, 3 insertions(+)
> 
> diff --git a/tools/testing/selftests/resctrl/resctrlfs.c b/tools/testing/selftests/resctrl/resctrlfs.c
> index 6b22a186790a..87195eb78356 100644
> --- a/tools/testing/selftests/resctrl/resctrlfs.c
> +++ b/tools/testing/selftests/resctrl/resctrlfs.c
> @@ -570,6 +570,9 @@ bool check_resctrlfs_support(void)
>   	ksft_print_msg("%s kernel supports resctrl filesystem\n",
>   		       ret ? "Pass:" : "Fail:");
>   

This message is a bit confusing. Please change this to read
and send a follow-on patch on top of linux-kselftest next

"Check kernel support for resctrl filesystem"

thanks,
-- Shuah