linux-kernel - Re: [PATCH] x86/intel_rdt: Implement "update" mode when writing schemata file

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Date:   Fri, 31 Mar 2017 19:49:16 +0200 (CEST)
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Shivappa Vikas <vikas.shivappa@...el.com>
cc:     "Luck, Tony" <tony.luck@...el.com>,
        Fenghua Yu <fenghua.yu@...el.com>, x86@...nel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] x86/intel_rdt: Implement "update" mode when writing
 schemata file

On Fri, 31 Mar 2017, Shivappa Vikas wrote:
> On Fri, 31 Mar 2017, Thomas Gleixner wrote:
> 
> > On Fri, 24 Mar 2017, Luck, Tony wrote:
> > > +Reading/writing the schemata file
> > > +---------------------------------
> > > +Reading the schemata file will show the state of all resources
> > > +on all domains. When writing you only need to specify those values
> > > +which you wish to change.  E.g.
> > > +
> > > +# cat schemata
> > > +L3DATA:0=fffff;1=fffff;2=fffff;3=fffff
> > > +L3CODE:0=fffff;1=fffff;2=fffff;3=fffff
> > > +# echo "L3DATA:2=3c0;" > schemata
> > > +# cat schemata
> > > +L3DATA:0=fffff;1=fffff;2=3c0;3=fffff
> > > +L3CODE:0=fffff;1=fffff;2=fffff;3=fffff
> > 
> > It would be nice if the output would cover the mask width, i.e:
> > 
> > L3DATA:0=fffff;1=fffff;2=003c0;3=fffff
> > L3CODE:0=fffff;1=fffff;2=fffff;3=fffff
> > 
> > because that makes it tabular and simpler to read.
> 
> Will add this.
> 
> A sample with MBA:
> 
>   L3DATA:0=fffff;1=fffff;2=003c0;3=fffff
>   L3CODE:0=fffff;1=fffff;2=fffff;3=fffff
>       MB:0=   10;1=   20;2=  100;3=  100

Well done, the widest group sets the width for all others!

Thanks,

	tglx