linux-kernel - Re: [PATCH v10 05/12] task_isolation: support CONFIG_TASK_ISOLATION

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Date:	Thu, 03 Mar 2016 10:34:16 -0800
From:	Andi Kleen <andi@...stfloor.org>
To:	Chris Metcalf <cmetcalf@...hip.com>
Cc:	Gilad Ben Yossef <giladb@...hip.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Ingo Molnar <mingo@...nel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"Rik van Riel" <riel@...hat.com>, Tejun Heo <tj@...nel.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Christoph Lameter <cl@...ux.com>,
	Viresh Kumar <viresh.kumar@...aro.org>,
	Catalin Marinas <catalin.marinas@....com>,
	Will Deacon <will.deacon@....com>,
	Andy Lutomirski <luto@...capital.net>,
	<linux-doc@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v10 05/12] task_isolation: support CONFIG_TASK_ISOLATION_ALL

Chris Metcalf <cmetcalf@...hip.com> writes:
>  
> +config TASK_ISOLATION_ALL
> +	bool "Provide task isolation on all CPUs by default (except CPU 0)"
> +	depends on TASK_ISOLATION
> +	help
> +	 If the user doesn't pass the task_isolation boot option to
> +	 define the range of task isolation CPUs, consider that all
> +	 CPUs in the system are task isolation by default.
> +	 Note the boot CPU will still be kept outside the range to
> +	 handle timekeeping duty, etc.

That seems like a very dangerous Kconfig option.
"CONFIG_BREAK_EVERYTHING"
If someone sets that by default they will have a lot of trouble.

I wouldn't add that, make it a run time option only.

-Andi

-- 
ak@...ux.intel.com -- Speaking for myself only