From: Will Deacon <will.deacon@arm.com>
To: Amit Tomer <amittomer25@gmail.com>
Cc: "linux-perf-users@vger.kernel.org" <linux-perf-users@vger.kernel.org>
Subject: Re: Perf support for stalled-cycles-frontend and stalled-cycles-backend event
Date: Thu, 7 Nov 2013 17:23:50 +0000 [thread overview]
Message-ID: <20131107172349.GJ13139@mudshark.cambridge.arm.com> (raw)
In-Reply-To: <CABHD4K9uYYx3ga=joDid71YUWT7o93Cg8hDSQgX=dDy156vAsQ@mail.gmail.com>
On Wed, Nov 06, 2013 at 01:33:23PM +0000, Amit Tomer wrote:
> We recently installed Perf tool on our platform based on Cortex A-15 cores and Linux kerenl 3.4.8.
>
> We enabled the Hardware Performance counter(PMU) and can see below message in dmeg log .
>
> [ 2.292157] hw perfevents: enabled with ARMv7 Cortex-A15 PMU driver, 7 counters available
>
> This message suggests there are 7 counter avaiable here.
>
> But when we run the below command ,we find two counters named stalled-cycles-frontend and stalled-cycles-backend are not suported
Take a look at the Cortex-A15 TRM. I couldn't see anything in there which
matched my understanding of stalled-cycles-frontend or
stalled-cycles-backend, so I decided to leave them as UNSUPPORTED.
Do you have a suggestion for which event to use?
Will
prev parent reply other threads:[~2013-11-07 17:23 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <CABHD4K9uYYx3ga=joDid71YUWT7o93Cg8hDSQgX=dDy156vAsQ@mail.gmail.com>
2013-11-06 13:45 ` Fwd: Perf support for stalled-cycles-frontend and stalled-cycles-backend event Amit Tomer
2013-11-07 17:23 ` Will Deacon [this message]
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