linux-kernel - Re: [RFC][PATCH 10/14] x86: generic aperf/mperf code.

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Message-Id: <200909041134.43452.trenn@suse.de>
Date:	Fri, 4 Sep 2009 11:34:42 +0200
From:	Thomas Renninger <trenn@...e.de>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Ingo Molnar <mingo@...e.hu>, linux-kernel@...r.kernel.org,
	Gautham R Shenoy <ego@...ibm.com>,
	Andreas Herrmann <andreas.herrmann3@....com>,
	Balbir Singh <balbir@...ibm.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	Venkatesh Pallipadi <venkatesh.pallipadi@...el.com>,
	Yanmin <yanmin_zhang@...ux.intel.com>,
	Dave Jones <davej@...hat.com>, Len Brown <len.brown@...el.com>,
	Yinghai Lu <yhlu.kernel@...il.com>, cpufreq@...r.kernel.org,
	Venkatesh Pallipadi <venkatesh.pallipadi@...el.com>
Subject: Re: [RFC][PATCH 10/14] x86: generic aperf/mperf code.

On Friday 04 September 2009 11:27:19 Peter Zijlstra wrote:
> On Fri, 2009-09-04 at 11:25 +0200, Peter Zijlstra wrote:
> > On Fri, 2009-09-04 at 11:19 +0200, Thomas Renninger wrote:
> > > You still use struct perf_pair split/hi/lo members in #ifdef 
__i386__ 
> > > case which you deleted above.
> > 
> > > >               shift_count = fls(h);
> > > >  
> > > > -             cur.aperf.whole >>= shift_count;
> > > > -             cur.mperf.whole >>= shift_count;
> > > > +             cur.aperf >>= shift_count;
> > > > +             cur.mperf >>= shift_count;
> > > >       }
> > > >  
> > > >       if (((unsigned long)(-1) / 100) < cur.aperf.split.lo) {
> > > Same here, possibly still elsewhere.
> > > Is this only x86_64 compile tested?
> > 
> > Of course, who still has 32bit only hardware anyway ;-)
> > 
> > Will fix, thanks for spotting that.
> 
> Hrmm, on that, does it really make sense to maintain the i386 code
> path?
> 
> How frequently is that code called and what i386 only chips support
> aperf/mperf, atom?
Venki should know best.

   Thomas
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