linux-kernel - Re: [RFD] CAT user space interface revisited

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Message-ID: <20151119084422.5f80250c@redhat.com>
Date:	Thu, 19 Nov 2015 08:44:22 -0500
From:	Luiz Capitulino <lcapitulino@...hat.com>
To:	Thomas Gleixner <tglx@...utronix.de>
Cc:	Marcelo Tosatti <mtosatti@...hat.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Peter Zijlstra <peterz@...radead.org>, x86@...nel.org,
	Vikas Shivappa <vikas.shivappa@...el.com>,
	Tejun Heo <tj@...nel.org>, Yu Fenghua <fenghua.yu@...el.com>
Subject: Re: [RFD] CAT user space interface revisited

On Thu, 19 Nov 2015 09:35:34 +0100 (CET)
Thomas Gleixner <tglx@...utronix.de> wrote:

> > Well any work on behalf of the important task, should have its cache
> > protected as well (example irq handling threads). 
> 
> Right, but that's nothing you can do automatically and certainly not
> from a random application.

Right and that's not a problem. For the use-cases CAT is intended to,
manual and per-workload system setup is very common. Things like
thread pinning, hugepages reservation, CPU isolation, nohz_full, etc
require manual setup too.
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