linux-kernel - Re: [PATCH v4 00/29] selftests/resctrl: CAT test improvements & generalized test framework

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Message-ID: <a110877e-2b5c-40c6-9128-2f4d6e205f39@intel.com>
Date: Fri, 15 Dec 2023 15:45:14 -0800
From: Reinette Chatre <reinette.chatre@...el.com>
To: Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>,
	<linux-kselftest@...r.kernel.org>, Shuah Khan <shuah@...nel.org>, "Shaopeng
 Tan" <tan.shaopeng@...fujitsu.com>, Maciej Wieczór-Retman
	<maciej.wieczor-retman@...el.com>, Fenghua Yu <fenghua.yu@...el.com>
CC: <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v4 00/29] selftests/resctrl: CAT test improvements &
 generalized test framework



On 12/15/2023 9:45 AM, Reinette Chatre wrote:
> Hi Ilpo and Shuah,
> 
> On 12/15/2023 7:04 AM, Ilpo Järvinen wrote:
>> Here's v4 series to improve resctrl selftests with generalized test
>> framework and rewritten CAT test.
>>
>> The series contains following improvements:
>>
>> - Excludes shareable bits from CAT test allocation to avoid interference
>> - Replaces file "sink" with a volatile variable
>> - Alters read pattern to defeat HW prefetcher optimizations
>> - Rewrites CAT test to make the CAT test reliable and truly measure
>>   if CAT is working or not
>> - Introduces generalized test framework making easier to add new tests
>> - Lots of other cleanups & refactoring
>>
>> This series has been tested across a large number of systems from
>> different generations.
> 
> Ilpo, thank you very much for this great cleanup and a creating a
> reliable CAT test. This work is focused on kernel health and greatly
> appreciated.
> 
> All patches in this series should have my reviewed-by tag. For
> confirmation, for this whole series:
> Reviewed-by: Reinette Chatre <reinette.chatre@...el.com>
> 
> Shuah, could you please consider this series for inclusion at
> your convenience?

Just in case somebody tries this series out against kernel v6.7-rc5 ...

A problematic perf patch made it into v6.7-rc5 (v6.7-rc4 and before are fine).
When testing this series against kernel v6.7-rc5 the splat reported at [1]
is triggered. A perf fix [2] is already queued up so all will be fine when testing
this series against a kernel with [2] merged.

Reinette


[1] https://lore.kernel.org/lkml/20231214000620.3081018-1-lucas.demarchi@intel.com/
[2] https://lore.kernel.org/lkml/20231215112450.3972309-1-mark.rutland@arm.com/