linux-kernel - Re: [PATCH 2/7] perf: New helper function for pmu name

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Message-ID: <20101006155704.GB10220@linux-sh.org>
Date:	Thu, 7 Oct 2010 00:57:04 +0900
From:	Paul Mundt <lethal@...ux-sh.org>
To:	Robert Richter <robert.richter@....com>
Cc:	Peter Zijlstra <peterz@...radead.org>,
	Matt Fleming <matt@...sole-pimps.org>,
	Will Deacon <will.deacon@....com>,
	Russell King <linux@....linux.org.uk>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-sh@...r.kernel.org" <linux-sh@...r.kernel.org>,
	Ingo Molnar <mingo@...e.hu>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	"linux-arch@...r.kernel.org" <linux-arch@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Deng-Cheng Zhu <dengcheng.zhu@...il.com>,
	Grant Likely <grant.likely@...retlab.ca>
Subject: Re: [PATCH 2/7] perf: New helper function for pmu name

On Wed, Oct 06, 2010 at 05:50:26PM +0200, Robert Richter wrote:
> On 06.10.10 09:30:41, Paul Mundt wrote:
> > On Wed, Oct 06, 2010 at 03:18:25PM +0200, Robert Richter wrote:
> > > So, I am also fine with implementing a generic perf_pmu_name() for sh
> > > and then derive the oprofile cpu_type string from it in the oprofile
> > > code.
> > > 
> > Again, this is unacceptable.
> 
> Paul,
> 
> maybe I misunderstood you, but isn't this you preferred solution? We
> make perf_pmu_name() part of the generic i/f and then derive the
> oprofile name from the pmu name provided by perf.
> 
Perhaps we've misunderstood each other. I thought what you meant is that
we would carry a special API deviation in the architecture code or expose
the sh_pmu structure to generic code, both of which I have no interest
in. My preferred solution is that we provide a perf_pmu_name() in the
generic perf code as a __weak and then override it in the sh code, where
we have sh_pmu visibility. This way we aren't providing any special APIs
and sh_pmu remains constrained to the sh perf events code.
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