[LU-20285] replaces an indirect heuristic (vui_ra_valid flag) with a direct check of the I/O type (CIT_FAULT)

• Type: Bug
• Resolution: Unresolved
• Priority: Medium
• Labels: patch

Epic/Theme

patch

• Severity: 3
• Assignee: WC Triage
• Reporter: Xiyang Wang

Description

The patch replaces an indirect heuristic (vui_ra_valid flag)
with a direct check of the I/O type (CIT_FAULT),
which represents a page fault handling operation
(typically triggered by mmap'd page access).

CIT_FAULT explicitly indicates the I/O is happening
due to a page fault from a memory-mapped region,
rather than inferring from readahead validity.