linux-kernel - Re: [patch 6/6] x86, perf, cqm: Add storage for closid and cleanup struct intel_pqr

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Date:	Tue, 19 May 2015 14:59:18 +0200 (CEST)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Matt Fleming <matt@...eblueprint.co.uk>
cc:	LKML <linux-kernel@...r.kernel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Vikas Shivappa <vikas.shivappa@...ux.intel.com>,
	x86@...nel.org, Matt Fleming <matt.fleming@...el.com>,
	Will Auld <will.auld@...el.com>,
	Kanaka Juvva <kanaka.d.juvva@...el.com>
Subject: Re: [patch 6/6] x86, perf, cqm: Add storage for closid and cleanup
 struct intel_pqr_state

On Tue, 19 May 2015, Matt Fleming wrote:
> On Tue, 19 May, at 12:00:58AM, Thomas Gleixner wrote:
> > closid (CLass Of Service ID) is used for the Class based Cache
> > Allocation Technology (CAT). Add explicit storage to the per cpu cache
> > for it, so it can be used later with the CAT support (requires to move
> > the per cpu data).
> > 
> > While at it:
> > 
> >  - Rename the structure to intel_pqr_state which reflects the actual
> >    purpose of the struct: Cache values which go into the PQR MSR
> > 
> >  - Rename 'cnt' to rmid_usecnt which reflects the actual purpose of
> >    the counter.
> > 
> >  - Document the structure and the struct members.
> > 
> > Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
> > ---
> >  arch/x86/kernel/cpu/perf_event_intel_cqm.c |   50 +++++++++++++++--------------
> >  1 file changed, 27 insertions(+), 23 deletions(-)
> > 
> > Index: linux/arch/x86/kernel/cpu/perf_event_intel_cqm.c
> > ===================================================================
> > --- linux.orig/arch/x86/kernel/cpu/perf_event_intel_cqm.c
> > +++ linux/arch/x86/kernel/cpu/perf_event_intel_cqm.c
> > @@ -16,18 +16,32 @@
> >  static unsigned int cqm_max_rmid = -1;
> >  static unsigned int cqm_l3_scale; /* supposedly cacheline size */
> >  
> > -struct intel_cqm_state {
> > +/**
> > + * struct intel_pqr_state - State cache for the PQR MSR
> > + * @rmid:	The cached Resource Monitoring ID
> > + * @closid:	The cached Class Of Service ID
> > + * @usecnt:	The usage counter for rmid
> > + *
> 
> Typo? Should be @rmid_usecnt.

Indeed.
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