[LU-8541] change lru_max_age to units of ms

• Type: Bug
• Resolution: Fixed
• Priority: Minor
• Fix Version/s: Lustre 2.11.0, Lustre 2.10.2
• Severity: 3
• Assignee: Niu Yawei (Inactive)
• Reporter: Andreas Dilger

Description

Currently the ldlm.namespaces.*.lru_max_age parameter is printed in units of HZ, but that is not a useful unit of measure. Instead this should be exported to userspace in units of ms (which matches the HZ=1000 used by default on RHEL systems, so it won't be a user-visible change). The parameter read/written should be translated into units of HZ in lprocfs.

It would actually be better to have this in units of seconds, but I don't think it is possible to change lru_max_age in a compatible way. Instead, a second parameter could be added like lru_max_seconds that converts from seconds to HZ to set the same parameter, but that is not very critical compared to having constant units between clients.

Issue Links

• is related to: LU-9019 Migrate lustre to standard 64 bit time kernel API