linux-kernel - Re: [RFC][PATCH] perf: Add a few generic stalled-cycles events

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Date:	Fri, 19 Oct 2012 10:05:39 -0700
From:	Sukadev Bhattiprolu <sukadev@...ux.vnet.ibm.com>
To:	Stephane Eranian <eranian@...gle.com>
Cc:	Robert Richter <robert.richter@....com>,
	Peter Zijlstra <peterz@...radead.org>,
	Anton Blanchard <anton@....ibm.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	linuxppc-dev@...abs.org, Paul Mackerras <paulus@...ba.org>,
	mpjohn@...ibm.com, Ingo Molnar <mingo@...nel.org>,
	Arun Sharma <asharma@...com>
Subject: Re: [RFC][PATCH] perf: Add a few generic stalled-cycles events

Stephane Eranian [eranian@...gle.com] wrote:
| So all in all, I think this is not a very good idea. You have to put
| this into the tool or a library that auto-detects the
| host CPU and programs the right set of events.
| 
| We've had that discussion many times. Just reiterating my personal
| opinion on this.

Yes that would work too. One drawback is that the hardware events
will be in the tool, while the software/tracepoint events in the
kernel sysfs representation.

Or is that the reason we want all events in one place (sysfs) ?

Sukadev

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