linux-kernel - Re: [PATCH v4 2/2] cpusets,isolcpus: add file to show isolated cpus in cpuset

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Date:	Mon, 2 Mar 2015 14:15:39 +0800
From:	Zefan Li <lizefan@...wei.com>
To:	Rik van Riel <riel@...hat.com>
CC:	<linux-kernel@...r.kernel.org>,
	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>,
	<cgroups@...r.kernel.org>
Subject: Re: [PATCH v4 2/2] cpusets,isolcpus: add file to show isolated cpus
 in cpuset

Hi Rik,

> Subject: cpusets,isolcpus: add file to show isolated cpus in cpuset
> 
> 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.
> 

One Question, why not add a /sys/devices/system/cpu/isolated instead?

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