From: shawnguo@kernel.org (Shawn Guo)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH 1/1 v8] ARM: imx: Added perf functionality to mmdc driver
Date: Sun, 23 Oct 2016 20:41:50 +0800 [thread overview]
Message-ID: <20161023124149.GS30578@tiger> (raw)
In-Reply-To: <1474307849-7341-1-git-send-email-Frank.Li@nxp.com>
On Mon, Sep 19, 2016 at 12:57:29PM -0500, Frank Li wrote:
> From: Zhengyu Shen <zhengyu.shen@nxp.com>
>
> 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>
Applied, thanks.
prev parent reply other threads:[~2016-10-23 12:41 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-09-19 17:57 [PATCH 1/1 v8] ARM: imx: Added perf functionality to mmdc driver Frank Li
2016-09-26 16:40 ` Zhi Li
2016-10-10 20:17 ` Zhi Li
2016-10-13 12:49 ` Shawn Guo
2016-10-23 12:41 ` Shawn Guo [this message]
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