linux-kernel - Re: [PATCH 3/7] x86/intel_rdt: Add support for cache bit mask management

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Date:	Wed, 20 May 2015 21:02:58 +0200 (CEST)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Vikas Shivappa <vikas.shivappa@...el.com>
cc:	Vikas Shivappa <vikas.shivappa@...ux.intel.com>, x86@...nel.org,
	linux-kernel@...r.kernel.org, hpa@...or.com, mingo@...nel.org,
	tj@...nel.org, peterz@...radead.org,
	Matt Fleming <matt.fleming@...el.com>,
	"Auld, Will" <will.auld@...el.com>, peter.zijlstra@...el.com,
	h.peter.anvin@...el.com,
	"Juvva, Kanaka D" <kanaka.d.juvva@...el.com>, mtosatti@...hat.com
Subject: Re: [PATCH 3/7] x86/intel_rdt: Add support for cache bit mask
 management

On Wed, 20 May 2015, Vikas Shivappa wrote:
> On Mon, 18 May 2015, Thomas Gleixner wrote:
> 
> > On Mon, 18 May 2015, Vikas Shivappa wrote:
> > > On Fri, 15 May 2015, Thomas Gleixner wrote:
> > > > > +static inline bool intel_rdt_update_cpumask(int cpu)
> > > > > +{
> > > > > +	}
> > > > 
> > > > You must be kidding.
> > > 
> > > the rapl and cqm use similar code. You want me to keep a seperate package
> > > mask
> > > for this code which not would be that frequent at all ?
> > 
> > You find for everything a place where you copied your stuff from
> > without thinking about it, right?
> > 
> > Other people dessperately try to fix the cpu online times which are
> > more and more interesting the larger the systems become. So it might
> > be a good idea to come up with a proper fast implementation which can
> > be used everywhere instead of blindly copying code.
> 
> Ok , i can try to do this as a seperate patch after the cache allocation to

Hell no. We do preparatory patches first. I'm not believing in 'can
try' promises.

> get a support for faster implementation for traversing package and cpus in the
> packages which can be used by everyone. we would need to start from scratch
> with having packagemask_t equivalent to cpumask_t. hope that is fair ?

Yes, that's what I want to see.

Thanks,

	tglx
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