linux-kernel - Re: [PATCH v5 1/2] scsi: ufs: Introduce hba performance monitor sysfs nodes

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Message-ID: <638d9eb678db15e95317c16f2313ea19@codeaurora.org>
Date:   Thu, 13 May 2021 09:15:09 +0800
From:   Can Guo <cang@...eaurora.org>
To:     Bean Huo <huobean@...il.com>
Cc:     asutoshd@...eaurora.org, nguyenb@...eaurora.org,
        hongwus@...eaurora.org, linux-scsi@...r.kernel.org,
        kernel-team@...roid.com, Alim Akhtar <alim.akhtar@...sung.com>,
        Avri Altman <avri.altman@....com>,
        "James E.J. Bottomley" <jejb@...ux.ibm.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        Stanley Chu <stanley.chu@...iatek.com>,
        Bean Huo <beanhuo@...ron.com>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Jaegeuk Kim <jaegeuk@...nel.org>,
        Kiwoong Kim <kwmad.kim@...sung.com>,
        Satya Tangirala <satyat@...gle.com>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v5 1/2] scsi: ufs: Introduce hba performance monitor sysfs
 nodes

On 2021-05-13 04:21, Bean Huo wrote:
> On Wed, 2021-04-21 at 19:28 -0700, Can Guo wrote:
>> +
>> 
>> +static DEVICE_ATTR_RW(monitor_enable);
>> 
>> +static DEVICE_ATTR_RW(monitor_chunk_size);
>> 
>> +static DEVICE_ATTR_RO(read_total_sectors);
>> 
>> +static DEVICE_ATTR_RO(read_total_busy);
>> 
>> +static DEVICE_ATTR_RO(read_nr_requests);
>> 
>> +static DEVICE_ATTR_RO(read_req_latency_avg);
>> 
>> +static DEVICE_ATTR_RO(read_req_latency_max);
>> 
>> +static DEVICE_ATTR_RO(read_req_latency_min);
>> 
>> +static DEVICE_ATTR_RO(read_req_latency_sum);
>> 
>> +static DEVICE_ATTR_RO(write_total_sectors);
>> 
>> +static DEVICE_ATTR_RO(write_total_busy);
>> 
>> +static DEVICE_ATTR_RO(write_nr_requests);
>> 
>> +static DEVICE_ATTR_RO(write_req_latency_avg);
>> 
>> +static DEVICE_ATTR_RO(write_req_latency_max);
>> 
>> +static DEVICE_ATTR_RO(write_req_latency_min);
>> 
>> +static DEVICE_ATTR_RO(write_req_latency_sum);
> 
> Can,
> 
> I like this series of patches, which can help me monitor UFS
> performance online. I have a suggestion,  how do you think that we add
> this to ufs-debugfs. Then we don't need to poll each parameter one by
> one, just one interface.
> 
> Bean

Hi Bean,

Thanks for your suggestion, put it into debugfs is also an option.
But on Android, debugfs is not mounted by default (the requirement
from Google). So it is convenient to have it in sysfs, and one can
use below cmd (as I listed in the cover letter) to poll all parameters
at once : "grep ^ /dev/null *".

Thanks,
Can Guo.