From: Ingo Molnar <mingo@elte.hu>
To: Tim Blechmann <tim@klingt.org>
Cc: linux-kernel@vger.kernel.org, Paul Mackerras <paulus@samba.org>,
Peter Zijlstra <a.p.zijlstra@chello.nl>
Subject: Re: [PATCH] perf stat: add branch performance counters to default
Date: Mon, 19 Oct 2009 13:23:02 +0200 [thread overview]
Message-ID: <20091019112302.GB12829@elte.hu> (raw)
In-Reply-To: <4ADC3975.8050109@klingt.org>
* Tim Blechmann <tim@klingt.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
next prev parent reply other threads:[~2009-10-19 11:23 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-10-19 10:03 Tim Blechmann
2009-10-19 11:23 ` Ingo Molnar [this message]
2009-10-19 11:43 ` Ingo Molnar
2009-10-19 11:47 ` [tip:perf/core] perf stat: Add branch performance events to default output tip-bot for Tim Blechmann
2009-10-19 11:47 ` [tip:perf/core] perf stat: Re-align the default_attrs[] array tip-bot for Ingo Molnar
2009-10-19 11:47 ` [tip:perf/core] perf stat: Count branches first tip-bot for Ingo Molnar
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