linux-kernel - Re: [PATCH 1/1 v8] ARM: imx: Added perf functionality to mmdc driver

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Message-ID: <20161013124904.GA25183@tiger>
Date:   Thu, 13 Oct 2016 20:49:04 +0800
From:   Shawn Guo <shawnguo@...nel.org>
To:     Zhi Li <lznuaa@...il.com>, Mark Rutland <mark.rutland@....com>
Cc:     Frank Li <Frank.Li@....com>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        kernel list <linux-kernel@...r.kernel.org>,
        peterz@...radead.org, mingo@...hat.com, acme@...nel.org,
        alexander.shishkin@...ux.intel.com,
        jerry shen <jerry.zhengyu.shen@...il.com>,
        Zhengyu Shen <zhengyu.shen@....com>
Subject: Re: [PATCH 1/1 v8] ARM: imx: Added perf functionality to mmdc driver

On Mon, Oct 10, 2016 at 03:17:36PM -0500, Zhi Li wrote:
> On Mon, Sep 26, 2016 at 11:40 AM, Zhi Li <lznuaa@...il.com> wrote:
> > On Mon, Sep 19, 2016 at 12:57 PM, Frank Li <Frank.Li@....com> wrote:
> >> From: Zhengyu Shen <zhengyu.shen@....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@....com>
> >> Signed-off-by: Frank Li <frank.li@....com>
> >> ---
> >
> > Mark:
> >         Any additional comments for this version?
> >
> 
> Shawn:
>            No any new comment for more than 2 weeks.
>            Did you plan accept this patch?

We normally do not apply patches in the middle of a merge window.  I
plan to apply it when 4.9-rc1 comes out.  But I still would like to get
a Reviewed-by tag from Mark before doing that.

@Mark,

Are you happy with this version?

Shawn