linux-kernel - Re: [PATCH v2 5/6] selftests/resctrl: Fix feature checks

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Date:   Tue, 26 Sep 2023 14:41:24 -0700
From:   Reinette Chatre <reinette.chatre@...el.com>
To:     Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>,
        Shuah Khan <shuah@...nel.org>,
        Shuah Khan <skhan@...uxfoundation.org>,
        <linux-kselftest@...r.kernel.org>,
        Maciej Wieczór-Retman 
        <maciej.wieczor-retman@...el.com>
CC:     LKML <linux-kernel@...r.kernel.org>,
        Shaopeng Tan <tan.shaopeng@...fujitsu.com>,
        <stable@...r.kernel.org>
Subject: Re: [PATCH v2 5/6] selftests/resctrl: Fix feature checks

Hi Ilpo,

On 9/15/2023 8:44 AM, Ilpo Järvinen wrote:
> The MBA and CMT tests expect support of other features to be able to
> run.
> 
> When platform only supports MBA but not MBM, MBA test will fail with:
> Failed to open total bw file: No such file or directory
> 
> When platform only supports CMT but not CAT, CMT test will fail with:
> Failed to open bit mask file '/sys/fs/resctrl/info/L3/cbm_mask': No such file or directory
> 
> Extend feature checks to cover these two conditions.

It may be helpful to expand on this more to justify why this is
stable material. At this point it sounds as though (from user space
perspective) one error is replaced by another. Perhaps just a snippet
that states that this fix will cause the test to be skipped on these
platforms.

> 
> Fixes: ee0415681eb6 ("selftests/resctrl: Use resctrl/info for feature detection")
> Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
> Cc: <stable@...r.kernel.org> # selftests/resctrl: Refactor feature check to use resource and feature name

Thank you.

Reviewed-by: Reinette Chatre <reinette.chatre@...el.com>

Reinette