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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

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