linux-kernel - Re: [PATCH 2/2] show nohz

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Message-ID: <1427516297.2447.59.camel@gmail.com>
Date:	Sat, 28 Mar 2015 05:18:17 +0100
From:	Mike Galbraith <umgwanakikbuti@...il.com>
To:	riel@...hat.com
Cc:	linux-kernel@...r.kernel.org, lizefan@...wei.com, tj@...nel.org,
	gregkh@...uxfoundation.org
Subject: Re: [PATCH 2/2] show nohz_full cpus in sysfs

On Fri, 2015-03-27 at 17:50 -0400, riel@...hat.com wrote:
> From: Rik van Riel <riel@...hat.com>
> 
> Currently there is no way to query which CPUs are in nohz_full
> mode from userspace.

Hm, they're both (as of your last set) invariant.  Is this so an HPC app
can automatically bind itself or something?  You can't have more than
one such app, or rather if you did, they'd need more than which CPUs are
HPC capable, they'd need occupancy too, so the query mechanism seems
kinda useless.  Box driver has to allocate CPUs, and presumably knows
the configuration of the box (those who don't become ex box drivers).

	-Mike

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