From: Shawn Guo <shawnguo@kernel.org>
To: Zhi Li <lznuaa@gmail.com>, Mark Rutland <mark.rutland@arm.com>
Cc: Zhengyu Shen <zhengyu.shen@nxp.com>, Frank Li <frank.li@nxp.com>,
"linux-arm-kernel@lists.infradead.org"
<linux-arm-kernel@lists.infradead.org>,
kernel list <linux-kernel@vger.kernel.org>,
peterz@infradead.org, mingo@redhat.com, acme@kernel.org,
alexander.shishkin@linux.intel.com
Subject: Re: [PATCH v3] Added perf functionality to mmdc driver
Date: Tue, 30 Aug 2016 19:43:29 +0800 [thread overview]
Message-ID: <20160830114329.GB8366@tiger> (raw)
In-Reply-To: <CAHrpEqTtCnEU1v1sEuN8yJGPudDRZ5A79=Wn5Bp4SgTxDiNTQQ@mail.gmail.com>
On Mon, Aug 29, 2016 at 11:06:44AM -0500, Zhi Li wrote:
> On Wed, Aug 17, 2016 at 2:42 PM, Zhengyu Shen <zhengyu.shen@nxp.com> wrote:
> > MMDC is a multi-mode DDR controller that supports DDR3/DDR3L x16/x32/x64
> > and LPDDR2 two channel x16/x32 memory types. MMDC is configurable, high
> > performance, and optimized. MMDC is present on i.MX6 Quad and i.MX6
> > QuadPlus devices, but this driver only supports i.MX6 Quad at the moment.
> > MMDC provides registers for performance counters which read via this
> > driver to help debug memory throughput and similar issues.
> >
> > $ perf stat -a -e mmdc/busy-cycles/,mmdc/read-accesses/,mmdc/read-bytes/,mmdc/total-cycles/,mmdc/write-accesses/,mmdc/write-bytes/ dd if=/dev/zero of=/dev/null bs=1M count=5000
> > Performance counter stats for 'dd if=/dev/zero of=/dev/null bs=1M count=5000':
> >
> > 898021787 mmdc/busy-cycles/
> > 14819600 mmdc/read-accesses/
> > 471.30 MB mmdc/read-bytes/
> > 2815419216 mmdc/total-cycles/
> > 13367354 mmdc/write-accesses/
> > 427.76 MB mmdc/write-bytes/
> >
> > 5.334757334 seconds time elapsed
> >
> > Signed-off-by: Zhengyu Shen <zhengyu.shen@nxp.com>
> > Signed-off-by: Frank Li <frank.li@nxp.com>
>
> Shawn Guo:
>
> No new comments got more than 1 weeks.
> Did you plan accept it?
@Mark, how do you think of this version?
Shawn
next prev parent reply other threads:[~2016-08-30 11:43 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-08-17 19:42 [PATCH v3] Added perf functionality to mmdc driver Zhengyu Shen
2016-08-29 16:06 ` Zhi Li
2016-08-30 11:43 ` Shawn Guo [this message]
2016-08-30 12:54 ` Mark Rutland
2016-08-30 20:01 ` Zhengyu Shen
2016-08-31 10:30 ` Mark Rutland
2016-08-31 13:46 ` Zhengyu Shen
2016-08-30 14:06 ` Shawn Guo
2016-08-31 13:08 ` Suzuki K Poulose
2016-08-31 16:20 ` Suzuki K Poulose
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