linux-kernel - Re: [PATCH v2 22/24] selftests/resctrl: Split measure_cache

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Message-ID: <695f71ed-46f6-e287-371d-bb11f014148d@intel.com>
Date:   Fri, 21 Apr 2023 17:21:48 -0700
From:   Reinette Chatre <reinette.chatre@...el.com>
To:     Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>,
        <linux-kselftest@...r.kernel.org>,
        Fenghua Yu <fenghua.yu@...el.com>,
        "Shuah Khan" <shuah@...nel.org>, <linux-kernel@...r.kernel.org>
CC:     Shaopeng Tan <tan.shaopeng@...fujitsu.com>
Subject: Re: [PATCH v2 22/24] selftests/resctrl: Split measure_cache_vals()
 function

Hi Ilpo,

On 4/18/2023 4:45 AM, Ilpo Järvinen wrote:
> The measure_cache_vals() function does a different thing depending on
> the test case that called it:
>   - For CAT, it measures LLC perf misses 2.

What does the "2" represent?

>   - For CMT, it measures LLC occupancy through resctrl.
> 
> Split these two functionalities such that CMT test calls a new function
> called measure_llc_resctrl() to get LLC occupancy through resctrl and
> CAT test directly calls get_llc_perf().
> 

The changelog mentions 'split' but the split does not end up the same for
the two usages. Why does this split end up with one usage moving to a direct
call (get_llc_perf()) while the other usage remains with a wrapper?
Why not open code both?


Reinette