From: Arnaldo Carvalho de Melo <acme@kernel.org>
To: Hendrik Brueckner <brueckner@linux.ibm.com>
Cc: Thomas Richter <tmricht@linux.ibm.com>,
linux-kernel@vger.kernel.org, linux-perf-users@vger.kernel.org,
brueckner@linux.vnet.ibm.com, schwidefsky@de.ibm.com,
heiko.carstens@de.ibm.com
Subject: Re: [PATCH 1/3] perf auxtrace: Support for perf report -D for s390
Date: Fri, 3 Aug 2018 10:32:52 -0300 [thread overview]
Message-ID: <20180803133252.GE7996@kernel.org> (raw)
In-Reply-To: <20180803100758.GA28475@linux.ibm.com>
Em Fri, Aug 03, 2018 at 12:07:58PM +0200, Hendrik Brueckner escreveu:
> Arnaldo,
>
> On Thu, Aug 02, 2018 at 09:49:09AM -0300, Arnaldo Carvalho de Melo wrote:
> > Em Thu, Aug 02, 2018 at 09:46:20AM +0200, Thomas Richter escreveu:
> > > Add initial support for s390 auxiliary traces using the
> > > CPU-Measurement Sampling Facility.
> >
> > Could you please provide one or two paragraphs explaining what is this
> > "CPU-Measurement Sampling Facility", in which hardware this is available
> > (all s/390 hardware has it? Just the 64-bit model(s)?) and provide a
> > public URL for people interested in further reading?
>
> The CPU-Measurement Facility (CPU-MF) provides a set of functions to obtain
> performance information on the mainframe. Basically, it was introduced
> with System z10 years ago for the z/Architecture, that means, 64-bit.
> For Linux, there are two facilities of interest, counter facility and sampling
> facility. The counter facility provides hardware counters for instructions,
> cycles, crypto-activities, and many more.
>
> The sampling facility is a hardware sampler that when started will write
> samples at a particular interval into a sampling buffer. At some point,
> for example, if a sample block is full, it generates an interrupt to collect
> samples (while the sampler continues to run).
>
> Few years ago, I started to provide the a perf PMU to use the counter
> and sampling facilities. Recently, the device driver was updated to also
> "export" the sampling buffer into the AUX area. Thomas now completed the
> related perf work to interpret and process these AUX data.
>
> If people are more interested in the sampling facility, they can have a
> look into:
>
> - The Load-Program-Parameter and the CPU-Measurement Facilities, SA23-2260-05
> http://www-01.ibm.com/support/docview.wss?uid=isg26fcd1cc32246f4c8852574ce0044734a
>
> and to learn how-to use it for Linux on Z, have look at chapter 54,
> "Using the CPU-measurement facilities" in the:
>
> - Device Drivers, Features, and Commands, SC33-8411-34
> http://public.dhe.ibm.com/software/dw/linux390/docu/l416dd34.pdf
-----------------------
Thanks a lot, I added this to the first commit, people investigating
this should be able to find that when doing research about the
implementation details.
- Arnaldo
next prev parent reply other threads:[~2018-08-03 13:33 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-08-02 7:46 [PATCH 0/3] perf report: Add s390 auxiliary trace support Thomas Richter
2018-08-02 7:46 ` [PATCH 1/3] perf auxtrace: Support for perf report -D for s390 Thomas Richter
2018-08-02 12:49 ` Arnaldo Carvalho de Melo
2018-08-03 10:07 ` Hendrik Brueckner
2018-08-03 13:32 ` Arnaldo Carvalho de Melo [this message]
2018-08-18 11:22 ` [tip:perf/urgent] " tip-bot for Thomas Richter
2018-08-02 7:46 ` [PATCH 2/3] perf report: Add raw report support for s390 auxiliary trace Thomas Richter
2018-08-08 3:37 ` mpe
2018-08-08 6:39 ` Thomas-Mich Richter
2018-08-08 15:53 ` Arnaldo Carvalho de Melo
2018-08-08 15:59 ` Arnaldo Carvalho de Melo
2018-08-08 16:08 ` Arnaldo Carvalho de Melo
2018-08-08 16:14 ` Arnaldo Carvalho de Melo
2018-08-08 16:42 ` Arnaldo Carvalho de Melo
2018-08-09 4:35 ` Thomas-Mich Richter
2018-08-09 15:14 ` Arnaldo Carvalho de Melo
2018-08-10 5:41 ` Michael Ellerman
2018-08-18 11:23 ` [tip:perf/urgent] " tip-bot for Thomas Richter
2018-08-02 7:46 ` [PATCH 3/3] perf report: Add GUI " Thomas Richter
2018-08-18 11:23 ` [tip:perf/urgent] " tip-bot for Thomas Richter
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