From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756594AbcJWMmP (ORCPT ); Sun, 23 Oct 2016 08:42:15 -0400 Received: from mail.kernel.org ([198.145.29.136]:40208 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751963AbcJWMmM (ORCPT ); Sun, 23 Oct 2016 08:42:12 -0400 Date: Sun, 23 Oct 2016 20:41:50 +0800 From: Shawn Guo To: Frank Li Cc: mark.rutland@arm.com, peterz@infradead.org, linux-kernel@vger.kernel.org, acme@kernel.org, Zhengyu Shen , alexander.shishkin@linux.intel.com, mingo@redhat.com, jerry.zhengyu.shen@gmail.com, lznuaa@gmail.com, linux-arm-kernel@lists.infradead.org Subject: Re: [PATCH 1/1 v8] ARM: imx: Added perf functionality to mmdc driver Message-ID: <20161023124149.GS30578@tiger> References: <1474307849-7341-1-git-send-email-Frank.Li@nxp.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1474307849-7341-1-git-send-email-Frank.Li@nxp.com> User-Agent: Mutt/1.5.21 (2010-09-15) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.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.