linux-kernel - Re: [PATCH 1/2] f2fs: add sysfs nodes to get discard information

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Message-ID: <af34f9cd-8972-583b-bae2-f11fe9058e63@kernel.org>
Date:   Mon, 16 Aug 2021 12:15:16 +0800
From:   Chao Yu <chao@...nel.org>
To:     李扬韬 <frank.li@...o.com>
Cc:     jaegeuk@...nel.org, linux-f2fs-devel@...ts.sourceforge.net,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] f2fs: add sysfs nodes to get discard information

On 2021/8/16 10:42, 李扬韬 wrote:
>>> I've added new sysfs nodes to show discard stat since mount, which
>>> will help us analyze whether the performance problem is related to
>>> discard.
>>>
>>> issued_discard  - Shows the number of issued discard
>>> queued_discard  - Shows the number of cached discard cmd count
>>> discard_cmd_cnt - Shows the number of cached discard cmd count
>>> undiscard_blks  - Shows the number of undiscard blocks
>>
>> We have exported them in debugfs, can you use that?
>>
>> Thanks,
> 
> But now Android is forbidden to open debugfs, and in fact we have not
> opened this configuration for a long time.

Weren't them be used for debug purpose? can you please explain more about
your use case?

Thanks,

> 
> Thx,
> Yangtao
> 
> 
>