linux-kernel - Re: RE: [PATCH v2 3/3] x86/resctrl: Add "*" shorthand to set minimum io

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Message-ID: <c60e32da-7935-439e-9f24-fd637512757d@amd.com>
Date: Thu, 18 Dec 2025 15:56:24 -0600
From: "Moger, Babu" <bmoger@....com>
To: "Luck, Tony" <tony.luck@...el.com>, Aaron Tomlin <atomlin@...mlin.com>,
 "Chatre, Reinette" <reinette.chatre@...el.com>,
 "Dave.Martin@....com" <Dave.Martin@....com>,
 "james.morse@....com" <james.morse@....com>,
 "babu.moger@....com" <babu.moger@....com>,
 "tglx@...utronix.de" <tglx@...utronix.de>,
 "mingo@...hat.com" <mingo@...hat.com>, "bp@...en8.de" <bp@...en8.de>,
 "dave.hansen@...ux.intel.com" <dave.hansen@...ux.intel.com>
Cc: "sean@...e.io" <sean@...e.io>,
 "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: RE: [PATCH v2 3/3] x86/resctrl: Add "*" shorthand to set minimum
 io_alloc CBM for all domains



On 12/18/2025 3:49 PM, Luck, Tony wrote:
>> +       if (id && *id == '*') {
> 
> That will accept arbitrary chars after the "*".
> 
> 	if (id && !strcmp(id, "*"))

oh.ok. Thanks

> 
>> What do you think?
> 
> Why is io_alloc special? The same simple change could apply to parse_line() to allow
> setting all domains in a resource to be set to the same value:
> 

Yes. I am fine with that approach. Treat "*" equivalent for all the 
resources not just io_alloc.

> # echo "L3:*=fff" > schemata
> 
> # echo "MB:*=50" > schemata
> 
> -Tony
> 
>