Messages in this thread | | | Date | Mon, 5 Sep 2016 10:34:51 +0800 | From | Shawn Guo <> | Subject | Re: [PATCH v4] ARM: imx: Added perf functionality to mmdc driver |
| |
On Wed, Aug 31, 2016 at 12:00:29PM -0500, Zhengyu Shen 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>
I'm fine with this version, but still want a Reviewed-by tag from Mark to apply the patch.
Shawn
| |