linux-kernel - RE: [PATCH 2/2] x86/resctrl: Don't workqueue local event counter reads

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Message-ID: <SJ1PR11MB6083EA70CB81A8E9B602F3BCFC562@SJ1PR11MB6083.namprd11.prod.outlook.com>
Date: Fri, 1 Nov 2024 18:35:25 +0000
From: "Luck, Tony" <tony.luck@...el.com>
To: Peter Newman <peternewman@...gle.com>, "Yu, Fenghua"
	<fenghua.yu@...el.com>, "Chatre, Reinette" <reinette.chatre@...el.com>
CC: Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...hat.com>,
	Borislav Petkov <bp@...en8.de>, Dave Hansen <dave.hansen@...ux.intel.com>,
	"x86@...nel.org" <x86@...nel.org>, "H . Peter Anvin" <hpa@...or.com>, "Babu
 Moger" <babu.moger@....com>, James Morse <james.morse@....com>, "Martin
 Kletzander" <nert.pinx@...il.com>, Shaopeng Tan <tan.shaopeng@...itsu.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>, "Eranian,
 Stephane" <eranian@...gle.com>
Subject: RE: [PATCH 2/2] x86/resctrl: Don't workqueue local event counter
 reads

>  Add a fast-path to ensure that requests bound to within the monitoring
> domain are read using a simple function call into mon_event_count()
> regardless of whether all CPUs in the target domain are using nohz_full.
...
> Fixes: 09909e098113 ("x86/resctrl: Queue mon_event_read() instead of sending an IPI")
>
> Signed-off-by: Peter Newman <peternewman@...gle.com>

Reviewed-by: Tony Luck <tony.luck@...el.com>

-Tony