linux-kernel - RE: [PATCH/RFC v2 0/3] Human readable platform-specific performance event support

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Message-id: <000201caa017$104aa5e0$30dff1a0$%fujak@samsung.com>
Date:	Thu, 28 Jan 2010 13:40:25 +0100
From:	Tomasz Fujak <t.fujak@...sung.com>
To:	'Peter Zijlstra' <peterz@...radead.org>
Cc:	jpihet@...sta.com, Michal Nazarewicz <m.nazarewicz@...sung.com>,
	Pawel Osciak <p.osciak@...sung.com>, jamie.iles@...ochip.com,
	will.deacon@....com, linux-kernel@...r.kernel.org, acme@...hat.com,
	kyungmin.park@...sung.com, mingo@...e.hu,
	linux-arm-kernel@...ts.infradead.org,
	Marek Szyprowski <m.szyprowski@...sung.com>
Subject: RE: [PATCH/RFC v2 0/3] Human readable platform-specific performance
 event support

Oops, I missed your statement from yesterday, that's why I posted the same
idea :s

Otherwise if the perf is meant to be closely tied to the kernel, maybe we
could use a (semi-)automated process to transform the event definitions 
(enums in a .c file) to something perf could use. Basically a replacement
for sysfs/debugfs entry in a separately distributed file.

But that does not look so straightforward to implement to me, maybe I'll
come up with something next week.

> -----Original Message-----
> From: linux-arm-kernel-bounces@...ts.infradead.org [mailto:linux-arm-
> kernel-bounces@...ts.infradead.org] On Behalf Of Peter Zijlstra
> Sent: Thursday, January 28, 2010 1:14 PM
> To: Tomasz Fujak
> Cc: jpihet@...sta.com; Michal Nazarewicz; Pawel Osciak;
> jamie.iles@...ochip.com; will.deacon@....com; linux-
> kernel@...r.kernel.org; acme@...hat.com; kyungmin.park@...sung.com;
> mingo@...e.hu; linux-arm-kernel@...ts.infradead.org; Marek Szyprowski
> Subject: RE: [PATCH/RFC v2 0/3] Human readable platform-specific
> performance event support
> 
> On Thu, 2010-01-28 at 12:57 +0100, Tomasz Fujak wrote:
> 
> please educate your MUA to wrap lines at ~80.
> 
> > Apparently I did not comprehend your attitude towards the events'
> > description being exported from the kernel.
> > There's been a lengthy discussion which ended in a conclusion that
> the
> > platform detection is a complicated task.
> 
> If its really that complicated export a pmu identifier someplace.
> 
> The fact is, the kernel simply doesn't use this list, we have perf in
> kernel so that resource scheduling and isolation can be done, for that
> we need to know how to program the hardware and we need to know about
> scheduling constraints, we do not need exhaustive lists of possible
> events, let alone descriptive text for them, in the kernel.
> 
> 
> 
> 
> _______________________________________________
> linux-arm-kernel mailing list
> linux-arm-kernel@...ts.infradead.org
> http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

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