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

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Message-ID: <20151016095022.GP3816@twins.programming.kicks-ass.net>
Date:	Fri, 16 Oct 2015 11:50:22 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Marcelo Tosatti <mtosatti@...hat.com>
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	Fenghua Yu <fenghua.yu@...el.com>,
	H Peter Anvin <hpa@...or.com>,
	Ingo Molnar <mingo@...hat.com>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	x86 <x86@...nel.org>,
	Vikas Shivappa <vikas.shivappa@...ux.intel.com>
Subject: Re: [PATCH V15 00/11] x86: Intel Cache Allocation Technology Support

On Thu, Oct 15, 2015 at 11:28:52PM -0300, Marcelo Tosatti wrote:
> On Thu, Oct 15, 2015 at 01:36:14PM +0200, Peter Zijlstra wrote:
> > On Tue, Oct 13, 2015 at 06:31:27PM -0300, Marcelo Tosatti wrote:
> > > I am rewriting the interface with ioctls, with commands similar to the
> > > syscall interface proposed.
> > 
> > Which is horrible for other use cases. I really don't see the problem
> > with the cgroup stuff.
> 
> Can you detail what "horrible" means? 

Say an RT scenario; you set up your machine with cgroups. You create a
cpuset with is disjoint from the others, you frob around with the cpu
cgroup, etc..

So once you're all done, you start your RT app into a cgroup.

But oh, fail, now you have to go muck about with ioctl()s to get the
cache allocation cruft to work.
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