linux-kernel - Re: [PATCH V15 00/11] x86: Intel Cache Allocation Technology Support

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Date:	Wed, 4 Nov 2015 10:35:42 -0500
From:	Luiz Capitulino <lcapitulino@...hat.com>
To:	Thomas Gleixner <tglx@...utronix.de>
Cc:	Fenghua Yu <fenghua.yu@...el.com>, H Peter Anvin <hpa@...or.com>,
	Ingo Molnar <mingo@...hat.com>,
	Peter Zijlstra <peterz@...radead.org>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	x86 <x86@...nel.org>,
	Vikas Shivappa <vikas.shivappa@...ux.intel.com>,
	Marcelo Tosatti <mtosatti@...hat.com>, tj@...nel.org,
	riel@...hat.com
Subject: Re: [PATCH V15 00/11] x86: Intel Cache Allocation Technology
 Support

On Wed, 4 Nov 2015 16:28:04 +0100 (CET)
Thomas Gleixner <tglx@...utronix.de> wrote:

> On Wed, 4 Nov 2015, Luiz Capitulino wrote:
> > On Wed, 4 Nov 2015 15:57:41 +0100 (CET)
> > Thomas Gleixner <tglx@...utronix.de> wrote:
> > 
> > > On Wed, 4 Nov 2015, Luiz Capitulino wrote:
> > > 
> > > > On Thu,  1 Oct 2015 23:09:34 -0700
> > > > Fenghua Yu <fenghua.yu@...el.com> wrote:
> > > > 
> > > > > This series has some preparatory patches and Intel cache allocation
> > > > > support.
> > > > 
> > > > Ping? What's the status of this series?
> > > 
> > > We still need to agree on the user space interface which is the
> > > hardest part of it....
> > 
> > My understanding is that two interfaces have been proposed: the cgroups
> > one and an API based on syscalls or ioctls.
> > 
> > Are those proposals mutual exclusive? What about having the cgroups one
> > merged IFF it's useful, and having the syscall API later if really
> > needed?
> > 
> > I don't want to make the wrong decision, but the cgroups interface is
> > here. Holding it while we discuss a perfect interface that doesn't
> > even exist will just do a bad service for users.
> 
> Well, no. We do not just introduce a random user space ABI simply
> because we have to support it forever.

I don't think it's random, it's in discussion for a long time and
Peter seems to be in favor of it.

But I'm all for progress here whatever route we take. In that regard,
what's your opinion on the best way to move forward?
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