On Fri, 15 Jan 2021 15:09:29 +0800 Huazhong Tan wrote:
From: Guangbin Huang huangguangbin2@huawei.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:
- echo dump priority 0 > tm
- 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.