From: Peter Zijlstra <peterz@infradead.org>
To: Ingo Molnar <mingo@kernel.org>
Cc: vincent.weaver@maine.edu, jolsa@redhat.com,
torvalds@linux-foundation.org, eranian@google.com,
tglx@linutronix.de, acme@redhat.com, ak@linux.intel.com,
linux-kernel@vger.kernel.org, hpa@zytor.com,
linux-tip-commits@vger.kernel.org
Subject: Re: [tip:perf/core] perf/x86: Use INST_RETIRED.PREC_DIST for cycles: ppp
Date: Sun, 6 Dec 2015 23:06:51 +0100 [thread overview]
Message-ID: <20151206220651.GM17308@twins.programming.kicks-ass.net> (raw)
In-Reply-To: <20151206131102.GA12167@gmail.com>
On Sun, Dec 06, 2015 at 02:11:02PM +0100, Ingo Molnar wrote:
> Also, I'm not convinced we need a new 'ppp' qualifier for any of this, why not
> just replace 'pp' with this event - 'pp' is meant to be our most precise event.
I requested this because the PREC_DIST events can only be scheduled on a
single counter, whereas the existing :pp events can be had on all 4.
This mean you can have 2 concurrent :pp users (without RR), but not :ppp.
next prev parent reply other threads:[~2015-12-06 22:07 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-12-01 0:28 [PATCH 1/2] perf, x86: Use INST_RETIRED.TOTAL_CYCLES_PS for cycles:pp for Skylake Andi Kleen
2015-12-01 0:28 ` [PATCH 2/2] x86, perf: Use INST_RETIRED.PREC_DIST for cycles:ppp Andi Kleen
2015-12-01 13:41 ` Peter Zijlstra
2015-12-01 14:54 ` Andi Kleen
2015-12-01 14:55 ` Peter Zijlstra
2015-12-04 11:50 ` [tip:perf/core] perf/x86: Use INST_RETIRED.PREC_DIST for cycles: ppp tip-bot for Andi Kleen
2015-12-06 13:11 ` Ingo Molnar
2015-12-06 22:06 ` Peter Zijlstra [this message]
2015-12-07 6:48 ` Ingo Molnar
2015-12-07 10:26 ` Peter Zijlstra
2015-12-07 14:02 ` Arnaldo Carvalho de Melo
2015-12-07 14:12 ` Peter Zijlstra
2015-12-07 13:51 ` Peter Zijlstra
2015-12-08 5:36 ` Ingo Molnar
2015-12-08 8:50 ` Peter Zijlstra
2015-12-08 8:57 ` Peter Zijlstra
2015-12-08 13:27 ` Peter Zijlstra
2015-12-09 8:29 ` Ingo Molnar
2016-01-06 18:51 ` tip-bot for Andi Kleen
2015-12-01 13:19 ` [PATCH 1/2] perf, x86: Use INST_RETIRED.TOTAL_CYCLES_PS for cycles:pp for Skylake Peter Zijlstra
2015-12-04 11:50 ` [tip:perf/core] perf/x86: " tip-bot for Andi Kleen
2016-01-06 18:51 ` tip-bot for Andi Kleen
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