From: Peter Zijlstra <peterz@infradead.org>
To: Andi Kleen <ak@linux.intel.com>
Cc: Andi Kleen <andi@firstfloor.org>,
linux-kernel@vger.kernel.org, Ingo Molnar <mingo@kernel.org>,
Thomas Gleixner <tglx@linutronix.de>
Subject: Re: [PATCH] x86, perf: Use INST_RETIRED.PREC_DIST for cycles:pp on Skylake
Date: Wed, 21 Oct 2015 18:52:52 +0200 [thread overview]
Message-ID: <20151021165252.GJ3604@twins.programming.kicks-ass.net> (raw)
In-Reply-To: <20151021152608.GG15102@tassilo.jf.intel.com>
On Wed, Oct 21, 2015 at 08:26:08AM -0700, Andi Kleen wrote:
> So it turns out that UOPS_RETIRED.ALL+pebs only works by accident
> on Skylake. It's not in the specification.
Accident or not, it works and you've tested it. Might as well keep it.
Specs can be updated.
Also, even with the SNB 'hickup' they still haven't got the memo that
cycles is important for PEBS ?
next prev parent reply other threads:[~2015-10-21 16:53 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-10-19 22:58 [PATCH] x86, perf: Use INST_RETIRED.PREC_DIST for cycles:pp on Skylake Andi Kleen
2015-10-20 11:36 ` Peter Zijlstra
2015-10-20 22:28 ` Andi Kleen
2015-10-21 8:09 ` Peter Zijlstra
2015-10-21 15:26 ` Andi Kleen
2015-10-21 16:52 ` Peter Zijlstra [this message]
2015-10-21 16:55 ` Andi Kleen
2015-10-21 18:57 ` Peter Zijlstra
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