linux-kernel - Re: [PATCH RFC] ioctl based CAT interface

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Date:	Mon, 16 Nov 2015 17:52:19 -0200
From:	Marcelo Tosatti <mtosatti@...hat.com>
To:	Thomas Gleixner <tglx@...utronix.de>
Cc:	Peter Zijlstra <peterz@...radead.org>,
	Luiz Capitulino <lcapitulino@...hat.com>,
	Vikas Shivappa <vikas.shivappa@...el.com>,
	Tejun Heo <tj@...nel.org>, Yu Fenghua <fenghua.yu@...el.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH RFC] ioctl based CAT interface

On Mon, Nov 16, 2015 at 03:42:08PM +0100, Thomas Gleixner wrote:
> On Mon, 16 Nov 2015, Marcelo Tosatti wrote:
> > You need a task to be part of two cgroups at one time, 
> > to support the following configuration:
> > 
> > Task-A: 70% of cache reserved exclusively (reservation-0).
> >         20% of cache reserved (reservation-1).
> > 
> > Task-B: 20% of cache reserved (reservation-1).
> 
> Why would such a configuration be desired?
> 
> Thanks,
> 
> 	tglx

The HW supports cache sharing, its a HW feature.

Makes sense to share reserved cache between threads of an application
that for example share a library.

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