From mboxrd@z Thu Jan 1 00:00:00 1970 From: shawnguo@kernel.org (Shawn Guo) Date: Sun, 23 Oct 2016 20:41:50 +0800 Subject: [PATCH 1/1 v8] ARM: imx: Added perf functionality to mmdc driver In-Reply-To: <1474307849-7341-1-git-send-email-Frank.Li@nxp.com> References: <1474307849-7341-1-git-send-email-Frank.Li@nxp.com> Message-ID: <20161023124149.GS30578@tiger> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org On Mon, Sep 19, 2016 at 12:57:29PM -0500, Frank Li wrote: > From: Zhengyu Shen > > 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 > Signed-off-by: Frank Li Applied, thanks.