[LU-9431] class_process_proc_param can't handle sysfs

• Type: Bug
• Resolution: Fixed
• Priority: Major
• Fix Version/s: Lustre 2.11.0
• Affects Version/s: Lustre 2.10.0
• Labels: patch

Epic/Theme

upstream

• Severity: 3
• Assignee: James A Simmons
• Reporter: James A Simmons

Description

Lustre has the ability to tune proc values using lctl conf_param on the MGS server. Those changes are stored and distributed to all the nodes avoiding to the complex process of setting ever node. The function class_process_proc_param() is used to change the setting using the lprocfs_vars that map to the proc file. With the move to sysfs/debugfs this no longer works. A new approach has to be written to handle sysfs settings. Also we should consider dropping setting debugfs entries since they tend to contain large quantities which the user will typical not set that kind of data

Issue Links

• is related to: LU-10869 conf-sanity test 76a fails with 'error while apply max_dirty_mb'
• is related to: LU-10756 Send Uevents for interesting Lustre changes
• is related to: LU-8066 Move lustre procfs handling to sysfs and debugfs.
• is related to: LU-7004 fix "lctl set_param -P" to allow deprecation of "lctl conf_param"