linux-kernel - Re: [PATCH] nohz: Revert "nohz: Set isolcpus when nohz

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Message-ID: <20151012175027.GC1113@lerouge>
Date:	Mon, 12 Oct 2015 19:50:29 +0200
From:	Frederic Weisbecker <fweisbec@...il.com>
To:	Christoph Lameter <cl@...ux.com>
Cc:	Chris Metcalf <cmetcalf@...hip.com>, paulmck@...ux.vnet.ibm.com,
	Ingo Molnar <mingo@...nel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Mike Galbraith <umgwanakikbuti@...il.com>,
	Dave Jones <davej@...hat.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Oleg Nesterov <oleg@...hat.com>,
	Alexey Dobriyan <adobriyan@...il.com>,
	Rik van Riel <riel@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH] nohz: Revert "nohz: Set isolcpus when nohz_full is set"

On Mon, Oct 12, 2015 at 12:45:08PM -0500, Christoph Lameter wrote:
> On Mon, 12 Oct 2015, Frederic Weisbecker wrote:
> 
> > But yeah if you guys want to create a new parameter that gathers nohz
> > and isolcpus I think we can.
> 
> Could we also add the rcu settings?

Yeah, those are implied by nohz_full anyway.

Now nohz_full shouldn't imply anything else than nohz but I'm not sure
I can change that. Kernel parameters are ABIs of some sort.

Ideally we should have something like cpu_isolation= which implies everything.

> 
> > task_isolation is really just about tasks so it should be another name.
> 
> no_os_cpus?
>
> os_free_cpus?

No, we can still do syscalls :-)

But noise_free_cpus= ?
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