linux-kernel - Re: 'perf upgrade' (was: Re: [PATCH v9 00/11] Add support for JSON event files.)

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Date:	Wed, 15 Apr 2015 08:53:24 +1000
From:	Michael Ellerman <mpe@...erman.id.au>
To:	Ingo Molnar <mingo@...nel.org>
Cc:	Sukadev Bhattiprolu <sukadev@...ux.vnet.ibm.com>, mingo@...hat.com,
	ak@...ux.intel.com, Jiri Olsa <jolsa@...hat.com>,
	Arnaldo Carvalho de Melo <acme@...nel.org>,
	peterz@...radead.org, namhyung@...nel.org,
	linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org,
	Pekka Enberg <penberg@....fi>,
	Arnaldo Carvalho de Melo <acme@...radead.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Thomas Gleixner <tglx@...utronix.de>,
	Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: 'perf upgrade' (was: Re: [PATCH v9 00/11] Add support for JSON
 event files.)

On Tue, 2015-04-14 at 14:58 +0200, Ingo Molnar wrote:
> * Michael Ellerman <mpe@...erman.id.au> wrote:
> 
> > On Tue, 2015-04-14 at 10:55 +0200, Ingo Molnar wrote:
> > > * Sukadev Bhattiprolu <sukadev@...ux.vnet.ibm.com> wrote:
> > > 
> > > > This is another attempt to resurrect Andi Kleen's patchset so users
> > > > can specify perf events by their event names rather than raw codes.
> > > > 
> > > > This is a rebase of Andi Kleen's patchset from Jul 30, 2014[1] to 4.0.
> > > > (I fixed minor and not so minor conflicts).
> > > 
> > > So this series shows some progress, but instead of this limited 
> > > checkout ability I'd still prefer it if 'perf download' downloaded 
> > > the latest perf code itself and built it - it shouldn't be limited 
> > > to just a small subset of the perf source code!
> > 
> > Ingo, can you please stop blocking this? It's getting ridiculous.
> > 
> > We've been waiting over 8 months for this to go in.
> 
> We just merged a patch series that was first sent in 2013. Some things 
> take time to get right.

The first attempt to get symbolic event name support into perf was sent in
2010, that's FIVE years ago [1].

And what complicated feature are we asking for? The ability to map a human
readable name to a hex code, it has the complexity of a first year programming
assignment.

Variations have been submitted by IBM [1], by Facebook [2], now by Intel, and
Google have just given up and carry the libpfm4 patch in their perf tool [3].

Can we please just get this merged.

If you *then* want to add support for perf auto-updating that's fine, but don't
conflate the two.
 
cheers


[1]: https://lkml.org/lkml/2010/3/11/146
[2]: http://article.gmane.org/gmane.comp.linux.perfmon2.devel/2912
[3]: https://github.com/David-Levinthal/gooda/blob/master/gooda-analyzer/perf-patches/linux-v3.17/0001-perf-tools-add-support-for-libpfm4.patch


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