linux-kernel - Re: [PATCH 1/2] Documentation: tracing: Documentation for ultrasoc SMB drivers

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Message-ID: <58e929cf-29a6-26ec-807f-94cca17bb708@huawei.com>
Date:   Tue, 7 Sep 2021 11:32:43 +0800
From:   "liuqi (BA)" <liuqi115@...wei.com>
To:     Mathieu Poirier <mathieu.poirier@...aro.org>,
        Linuxarm <linuxarm@...wei.com>
CC:     <suzuki.poulose@....com>, <mike.leach@...aro.org>,
        <coresight@...ts.linaro.org>, <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH 1/2] Documentation: tracing: Documentation for ultrasoc
 SMB drivers

Hi Mathieu,

On 2021/9/7 1:34, Mathieu Poirier wrote:
> On Mon, Jul 19, 2021 at 07:17:36PM +0800, Qi Liu wrote:
>> Ultrasoc trace module is a system level solution for tracing, and SMB
>> is the component in trace module to store trace message. This patch
>> brings in a documentation for ultrasoc SMB driver and simple introduces
>> how to use ultrasoc SMB by sysfs interface and perf interface.
>>
>> Signed-off-by: Qi Liu <liuqi115@...wei.com>

>> +Example usage of perf::
>> +
>> +	 $# ./perf list pmu
>> +	 cs_etm//                                    [Kernel PMU event]
>> +    $# ./perf record -e cs_etm/@...k_smb0/ -C 0 --per-thread sleep 2s
>> +    [ perf record: Woken up 2 times to write data ]
>> +    [ perf record: Captured and wrote 0.288 MB perf.data ]
>> +    $# ./perf report
> 
> This IP block works like any other sink device and as such I don't really see a
> need for this documentation - especially since it is mostly conveying the same
> information already present in coresight.rst.
> 

Yes, smb works as a sink device.
got it, I'll drop this documentation next time.

Thanks,
Qi

> Thanks,
> Mathieu
> >> --
>> 2.17.1
>>
> .
>