linux-kernel - Re: [PATCH v7 20/24] x86/resctrl: Introduce the interface to switch between monitor modes

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]

Message-ID: <b38c93bf-4650-45d1-9aca-8b4c4d425886@intel.com>
Date: Fri, 27 Sep 2024 08:07:26 -0700
From: Reinette Chatre <reinette.chatre@...el.com>
To: <babu.moger@....com>, <corbet@....net>, <fenghua.yu@...el.com>,
	<tglx@...utronix.de>, <mingo@...hat.com>, <bp@...en8.de>,
	<dave.hansen@...ux.intel.com>
CC: <x86@...nel.org>, <hpa@...or.com>, <paulmck@...nel.org>,
	<rdunlap@...radead.org>, <tj@...nel.org>, <peterz@...radead.org>,
	<yanjiewtw@...il.com>, <kim.phillips@....com>, <lukas.bulwahn@...il.com>,
	<seanjc@...gle.com>, <jmattson@...gle.com>, <leitao@...ian.org>,
	<jpoimboe@...nel.org>, <rick.p.edgecombe@...el.com>,
	<kirill.shutemov@...ux.intel.com>, <jithu.joseph@...el.com>,
	<kai.huang@...el.com>, <kan.liang@...ux.intel.com>,
	<daniel.sneddon@...ux.intel.com>, <pbonzini@...hat.com>,
	<sandipan.das@....com>, <ilpo.jarvinen@...ux.intel.com>,
	<peternewman@...gle.com>, <maciej.wieczor-retman@...el.com>,
	<linux-doc@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<eranian@...gle.com>, <james.morse@....com>
Subject: Re: [PATCH v7 20/24] x86/resctrl: Introduce the interface to switch
 between monitor modes

Hi Babu,

On 9/27/24 6:26 AM, Moger, Babu wrote:
> Hi Reinette,
> 
> On 9/26/2024 8:51 PM, Reinette Chatre wrote:
>> Hi Babu,
>>
>> On 9/26/24 12:39 PM, Moger, Babu wrote:
>>> On 9/19/24 12:38, Reinette Chatre wrote:
>>>> On 9/4/24 3:21 PM, Babu Moger wrote:
>>
>>>>> +      ::
>>>>> +
>>>>> +        # echo  "default" > /sys/fs/resctrl/info/L3_MON/mbm_assign_mode
>>>>> +
>>>>> +    The MBM event counters will reset when mbm_assign_mode is changed. Moving to
>>>>
>>>> "will reset" -> "may reset"? Please also be clear on what is meant with "MBM event counter".
>>>
>>> It "will reset".
>>>
>>
>> I understand that this is true for the ABMC implementation. My goal with making this vague is
>> to not have this reset set in stone if some other implementation behaves differently.
> 
> ok.
>>
>>>> Note that "counter" has a very specific meaning in this work and after considering that
>>>> it is not clear if "MBM event counter will reset" means that the counters are no longer
>>>> assigned or if it means that the counts associated with events will be reset.
>>>
>>> How about
>>>
>>> "The MBM event counters(mbm_total_bytes and mbm_local_bytes) associated
>>> with the event will reset when mbm_assign_mode is changed."
>>
>> In the docs "mbm_total_bytes" and "mbm_local_bytes" are termed "events" ... maybe
>> "The MBM events (mbm_total_bytes and/or mbm_local_bytes) associated
>> counters may reset when mbm_assign_mode is changed."?
> 
> Sure.
> 

Please do not just copy the text because I made a mistake with the grammar.
"The MBM events (mbm_total_bytes and/or mbm_local_bytes) associated with
counters may reset when mbm_assign_mode is changed."?

Reinette