netdev - Re: [PATCH net-next] net: hns3: debugfs add dump tm info of nodes, priority and qset

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Date:   Sat, 16 Jan 2021 18:23:06 -0800
From:   Jakub Kicinski <kuba@...nel.org>
To:     Huazhong Tan <tanhuazhong@...wei.com>
Cc:     <davem@...emloft.net>, <netdev@...r.kernel.org>,
        <salil.mehta@...wei.com>, <yisen.zhuang@...wei.com>,
        <huangdaode@...wei.com>, <linuxarm@...neuler.org>,
        Guangbin Huang <huangguangbin2@...wei.com>
Subject: Re: [PATCH net-next] net: hns3: debugfs add dump tm info of nodes,
 priority and qset

On Fri, 15 Jan 2021 15:09:29 +0800 Huazhong Tan wrote:
> From: Guangbin Huang <huangguangbin2@...wei.com>
> 
> To increase methods to dump more tm info, adds three debugfs commands
> to dump tm info of nodes, priority and qset. And a new tm file of debugfs
> is created for only dumping tm info.
> 
> Unlike previous debugfs commands, to dump each tm information, user needs
> to enter two commands now. The first command writes parameters to tm and
> the second command reads info from tm. For examples, to dump tm info of
> priority 0, user needs to enter follow two commands:
> 1. echo dump priority 0 > tm
> 2. cat tm
> 
> The reason for adding new tm file is because we accepted Jakub Kicinski's
> opinion as link https://lkml.org/lkml/2020/9/29/2101. And in order to
> avoid generating too many files, we implement write ops to allow user to
> input parameters.

Why are you trying to avoid generating too many files? How many files
would it be? What's the size of each dump/file?

> However, If there are two or more users concurrently write parameters to
> tm, parameters of the latest command will overwrite previous commands,
> this concurrency problem will confuse users, but now there is no good
> method to fix it.