Module observation 

Optional, process-wide diagnostic work counters. Process-wide counters for an explicit diagnostic capture. Never reset them.

Structs

BarrierAudit

Records which file or directory each barrier attempt reached, for as long as it lives: an exact inventory of barriers per inode. The counters above say how many barriers ran; this says on what. Barriers on every thread of the process are recorded, so it is meant for single-purpose processes and tests that serialize their measurements. The log grows by one entry per barrier.

BarrierLog

Everything an audit recorded.

BarrierRecord

One barrier attempt: the inode it reached and whether that is a directory. A filesystem reuses the inode number of a deleted file, and its creation time repeats within a coarse timer tick, so neither says which file a barrier reached. The inode’s generation number, which the filesystem changes every time it reuses the inode, does.

Observation

Keeps instrumented process counters active, including on worker threads.

Traits

ObservedSync

File barriers with the same I/O behavior and optional diagnostic accounting.

Functions

active

Whether an explicit capture is active anywhere in this process.

fsync_directory_calls

Cumulative barrier attempts on directories, a subset of the calls fsync_totals counts. The rest are barriers on files.

fsync_totals

Cumulative successful and failed barrier attempts, and their elapsed time.