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

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Message-ID: <SJ1PR11MB6083CCA2A7904E459B1AA35DFCA8A@SJ1PR11MB6083.namprd11.prod.outlook.com>
Date: Thu, 18 Dec 2025 21:49:23 +0000
From: "Luck, Tony" <tony.luck@...el.com>
To: "Moger, Babu" <bmoger@....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: [PATCH v2 3/3] x86/resctrl: Add "*" shorthand to set minimum
 io_alloc CBM for all domains

> +       if (id && *id == '*') {

That will accept arbitrary chars after the "*".

	if (id && !strcmp(id, "*"))

> 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:

# echo "L3:*=fff" > schemata

# echo "MB:*=50" > schemata

-Tony