Re: [PATCH v3] Added perf functionality to mmdc driver
From: Shawn Guo
Date: Tue Aug 30 2016 - 07:43:57 EST
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@xxxxxxx> 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@xxxxxxx>
> > Signed-off-by: Frank Li <frank.li@xxxxxxx>
> Shawn Guo:
> No new comments got more than 1 weeks.
> Did you plan accept it?
@Mark, how do you think of this version?