linux-kernel - Re: [PATCH v10 1/2] perf/amlogic: Add support for Amlogic meson G12 SoC DDR PMU driver

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Date:   Wed, 16 Nov 2022 17:49:43 +0800
From:   Jiucheng Xu <jiucheng.xu@...ogic.com>
To:     Bagas Sanjaya <bagasdotme@...il.com>
CC:     <linux-doc@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linux-amlogic@...ts.infradead.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        Jonathan Corbet <corbet@....net>,
        Will Deacon <will@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Neil Armstrong <neil.armstrong@...aro.org>,
        Kevin Hilman <khilman@...libre.com>,
        Jerome Brunet <jbrunet@...libre.com>,
        Martin Blumenstingl <martin.blumenstingl@...glemail.com>,
        Shuai Xue <xueshuai@...ux.alibaba.com>,
        John Garry <john.garry@...wei.com>,
        Wan Jiabing <wanjiabing@...o.com>,
        Chris Healy <cphealy@...il.com>,
        Jianxin Pan <jianxin.pan@...ogic.com>,
        Kelvin Zhang <kelvin.zhang@...ogic.com>,
        Chris Healy <healych@...on.com>
Subject: Re: [PATCH v10 1/2] perf/amlogic: Add support for Amlogic meson G12
 SoC DDR PMU driver


> What about this description below?
>
> ```
> Add support for Amlogic Meson G12 Series SOC - DDR bandwidth PMU driver
> framework and interfaces. The PMU can not only monitor the total DDR
> bandwidth, but also individual IP module bandwidth.
> ```
Thanks, Your description looks like much better. I agree with you.
>> Example usage:
>>
>>   $ perf stat -a -e meson_ddr_bw/total_rw_bytes/ -I 1000 sleep 10
>>
>> - or -
>>
>>   $ perf stat -a -e \
>>     meson_ddr_bw/total_rw_bytes/,\
>>     meson_ddr_bw/chan_1_rw_bytes,arm=1/ -I 1000 \
>>     sleep 10
>>
>> g12 SoC support 4 channels to monitor DDR bandwidth
>> simultaneously. Each channel can monitor up to 4 IP modules
>> simultaneously.
>>
>> For Instance, If you want to get the sum of DDR bandwidth
>> from CPU, GPU, USB3.0 and VDEC. You can use the following
>> command parameters to display.
>>
>>   $ perf stat -a -e \
>>     meson_ddr_bw/chan_2_rw_bytes,arm=1,gpu=1,usb3_0=1,nna=1/ -I 1000 \
>>     sleep 10
>>
>> Other events are supported, and advertised via perf list.
> The demo example should have been outside the patch description, though
> (more appropriate documentation as in patch [2/2]).
>
> Thanks.
Okay, I will modify it in the next version.

-- 
Thanks,
Jiucheng