From: Andi Kleen <ak@linux.intel.com>
To: Mark Rutland <mark.rutland@arm.com>
Cc: "kan.liang@intel.com" <kan.liang@intel.com>,
"a.p.zijlstra@chello.nl" <a.p.zijlstra@chello.nl>,
"mingo@redhat.com" <mingo@redhat.com>,
"acme@kernel.org" <acme@kernel.org>,
"eranian@google.com" <eranian@google.com>,
"adrian.hunter@intel.com" <adrian.hunter@intel.com>,
"dsahern@gmail.com" <dsahern@gmail.com>,
"jolsa@kernel.org" <jolsa@kernel.org>,
"namhyung@kernel.org" <namhyung@kernel.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH 4/9] perf/x86: special case per-cpu core misc PMU events
Date: Fri, 17 Jul 2015 13:17:47 -0700 [thread overview]
Message-ID: <20150717201747.GF7380@tassilo.jf.intel.com> (raw)
In-Reply-To: <20150717122105.GD26091@leverpostej>
> As with my earlier comments, I don't think these can be grouped with
> events (not even from the same PMU given their free-running nature).
Mark, we already went through this last time. There is nothing
stopping handling free running counters as part of other groups.
A perf event logically has a 64bit counter that accumulates counts from
a less wide hardware counter. A free running counter just has
to be sampled at the beginning and at the end of the measurement
period, and the difference between the two values added to the perf
counter. To handle CPU switches the counter is just sampled, and
accumulated into the software counter, before switching to another CPU.
Then you start the next measurement period with a sample from the
new CPU etc.
-Andi
next prev parent reply other threads:[~2015-07-17 20:17 UTC|newest]
Thread overview: 33+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-07-16 20:33 [PATCH 0/9] Intel core misc PMUs support kan.liang
2015-07-16 20:33 ` [PATCH 1/9] perf/x86: Add " kan.liang
2015-07-16 20:33 ` [PATCH 2/9] perf/x86: core_misc PMU disable and enable support kan.liang
2015-07-17 12:11 ` Mark Rutland
2015-07-17 13:46 ` Peter Zijlstra
2015-07-17 13:51 ` Peter Zijlstra
2015-07-17 15:35 ` Liang, Kan
2015-07-17 17:01 ` Andy Lutomirski
2015-07-17 17:52 ` Liang, Kan
2015-07-17 17:58 ` Andy Lutomirski
2015-07-17 18:15 ` Liang, Kan
2015-07-17 18:56 ` Andy Lutomirski
2015-07-17 21:11 ` Peter Zijlstra
2015-07-16 20:33 ` [PATCH 3/9] perf/x86: Add is_hardware_event kan.liang
2015-07-17 10:48 ` Mark Rutland
2015-07-17 15:03 ` Liang, Kan
2015-07-17 15:47 ` Mark Rutland
2015-07-17 16:11 ` Mark Rutland
2015-07-16 20:33 ` [PATCH 4/9] perf/x86: special case per-cpu core misc PMU events kan.liang
2015-07-17 12:21 ` Mark Rutland
2015-07-17 12:55 ` Peter Zijlstra
2015-07-17 18:11 ` Stephane Eranian
2015-07-17 20:17 ` Andi Kleen [this message]
2015-07-20 16:12 ` Mark Rutland
2015-07-16 20:33 ` [PATCH 5/9] perf,tools: open event with it's own cpus and threads kan.liang
2015-07-16 20:33 ` [PATCH 6/9] perf,tools: Dump per-sample freq in report -D kan.liang
2015-07-16 20:33 ` [PATCH 7/9] perf,tools: save APERF/MPERF/TSC in struct perf_sample kan.liang
2015-07-16 20:33 ` [PATCH 8/9] perf,tools: caculate and save tsc/avg/bzy freq in he_stat kan.liang
2015-07-17 20:25 ` Andi Kleen
2015-07-17 20:57 ` Liang, Kan
2015-07-17 21:27 ` Andi Kleen
2015-07-16 20:33 ` [PATCH 9/9] perf,tools: Show freq in perf report --stdio kan.liang
2015-07-17 11:39 ` [PATCH 0/9] Intel core misc PMUs support Ingo Molnar
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