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readahead: clean up the code, update docs

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Remove dubious comments and #if 0 section.  Document new event counters,
and add one for read failures.

Signed-off-by: Zygo Blaxell <bees@furryterror.org>
This commit is contained in:
Zygo Blaxell
2025-01-22 22:28:39 -05:00
parent 48b7fbda9c
commit 30cd375d03
2 changed files with 12 additions and 10 deletions
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7
docs/event-counters.md
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@ -281,11 +281,14 @@ The `progress` event group consists of events related to progress estimation.
readahead
---------
The `readahead` event group consists of events related to calls to `posix_fadvise`.
The `readahead` event group consists of events related to data prefetching (formerly calls to `posix_fadvise` or `readahead`, but now emulated in userspace).
* `readahead_bytes`: Number of bytes prefetched.
* `readahead_count`: Number of read calls.
* `readahead_clear`: Number of times the duplicate read cache was cleared.
* `readahead_skip`: Number of times a duplicate read was identified in the cache and skipped.
* `readahead_fail`: Number of read errors during prefetch.
* `readahead_ms`: Total time spent emulating readahead in user-space (kernel readahead is not measured).
* `readahead_skip`: Number of times a duplicate read was identified in the cache and skipped.
* `readahead_unread_ms`: Total time spent running `posix_fadvise(..., POSIX_FADV_DONTNEED)`.
replacedst