[LU-9906] Allow Lustre page dropping to use pagevec_release

• Type: Bug
• Resolution: Fixed
• Priority: Minor
• Fix Version/s: Lustre 2.12.0, Lustre 2.10.7
• Labels: performance
• Severity: 3
• Assignee: Patrick Farrell
• Reporter: Patrick Farrell

Description

When Lustre releases a lot of cached pages at once, it still calls page_release, instead of pagevec_release. When clearing OST ldlm lock lrus, the ldlm_bl threads end up spending much of their time contending for the zone lock taken by page_release.

With many namespaces and parallel lru clearing (as Cray does at the end of each job), this can be a significant time sink. Using pagevec release is much better. Patch coming shortly.

Issue Links

• is related to: LU-9920 Use pagevec for marking pages dirty