linux-kernel - Re: [PATCH] perf stat: add branch performance counters to default

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Message-ID: <20091019112302.GB12829@elte.hu>
Date:	Mon, 19 Oct 2009 13:23:02 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Tim Blechmann <tim@...ngt.org>
Cc:	linux-kernel@...r.kernel.org, Paul Mackerras <paulus@...ba.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Subject: Re: [PATCH] perf stat: add branch performance counters to default

* Tim Blechmann <tim@...ngt.org> wrote:

> not sure, whether there is any reason, why the branch performance 
> counters are not enabled by default. personally, i would find it quite 
> useful, though

yeah, i find it useful too. The main reason is that most of the systems 
out there have like 2 freely defined events. Only Nehalem and i think 
Power7 has more.

OTOH ... maybe we should just do it, as most measurement and tuning is 
done on modern hardware. I'll try your patch in the perf tree - if too 
many people complain we will undo it.

	Ingo
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