linux-kernel - Re: [PATCH] arm: perf: Add event descriptions

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Message-ID: <20150826165148.GF30466@arm.com>
Date:	Wed, 26 Aug 2015 17:51:49 +0100
From:	Will Deacon <will.deacon@....com>
To:	Drew Richardson <drew.richardson@....com>
Cc:	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Ingo Molnar <mingo@...hat.com>,
	Arnaldo Carvalho de Melo <acme@...nel.org>,
	Russell King <linux@....linux.org.uk>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	Wade Cherry <Wade.Cherry@....com>
Subject: Re: [PATCH] arm: perf: Add event descriptions

On Mon, Aug 17, 2015 at 09:58:09PM +0100, Drew Richardson wrote:
> On Tue, Aug 04, 2015 at 01:15:23AM +0100, Drew Richardson wrote:
> > Add additional information about hardware events to make counters self
> > describing. This makes the hardware PMUs easier to use as perf list
> > contains the possible events instead of users having to refer to
> > documentation like the ARM TRMs. This could also allow tools like
> > oprofile to support PMUs without requiring an update.
> > 
> > Signed-off-by: Drew Richardson <drew.richardson@....com>
> > ---
> >  arch/arm/kernel/perf_event.c    |   1 +
> >  arch/arm/kernel/perf_event_v7.c | 617 ++++++++++++++++++++++++++++++++++++++++
> >  2 files changed, 618 insertions(+)
> 
> Any concerns with merging this?

We should revisit this after the merge window (since the ARM perf code is
moving out to drivers/), but I do have reservations about putting all these
strings into the kernel. Why can't we put this into something like libpfm
instead?

Will
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