linux-kernel - Re: [PATCH 3/4] cpusets,isolcpus: add file to show isolated cpus in cpuset

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Message-ID: <20150318164745.GA21564@htj.duckdns.org>
Date:	Wed, 18 Mar 2015 12:47:45 -0400
From:	Tejun Heo <tj@...nel.org>
To:	riel@...hat.com
Cc:	linux-kernel@...r.kernel.org, cgroups@...r.kernel.org,
	lizefan@...wei.com, Peter Zijlstra <peterz@...radead.org>,
	Clark Williams <williams@...hat.com>,
	Ingo Molnar <mingo@...hat.com>,
	Luiz Capitulino <lcapitulino@...hat.com>,
	David Rientjes <rientjes@...gle.com>,
	Mike Galbraith <umgwanakikbuti@...il.com>
Subject: Re: [PATCH 3/4] cpusets,isolcpus: add file to show isolated cpus in
 cpuset

On Mon, Mar 09, 2015 at 12:12:09PM -0400, riel@...hat.com wrote:
> From: Rik van Riel <riel@...hat.com>
> 
> The previous patch makes it so the code skips over isolcpus when
> building scheduler load balancing domains. This makes it hard to
> see for a user which of the CPUs in a cpuset are participating in
> load balancing, and which ones are isolated cpus.
> 
> Add a cpuset.isolcpus file with info on which cpus in a cpuset are
> isolated CPUs.
> 
> This file is read-only for now. In the future we could extend things
> so isolcpus can be changed at run time, for the root (system wide)
> cpuset only.

Didn't Li say that this is trivially computable from userland?  I'm
not sure this knob actually belongs to cpuset.

Thanks.

-- 
tejun
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