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docs: add readahead_ event group

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readahead and unreadahead have new event counters.  Document them.

Signed-off-by: Zygo Blaxell <bees@furryterror.org>
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Zygo Blaxell 2021-10-04 20:38:32 -04:00
parent a353d8cc6e
commit b436f8483b
1 changed files with 8 additions and 0 deletions
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docs/event-counters.md
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@ -258,6 +258,14 @@ The `pairforward` event group consists of events related to extending matching b
* `pairforward_try`: Started extending a pair of matching block ranges forward.
* `pairforward_zero`: A pair of matching block ranges could not be extended backward by one block because the src block contained all zeros and was not compressed.
readahead
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The `readahead` event group consists of events related to calls to `posix_fadvise`.
* `readahead_ms`: Total time spent running `posix_fadvise(..., POSIX_FADV_WILLNEED)` aka `readahead()`.
* `readahead_unread_ms`: Total time spent running `posix_fadvise(..., POSIX_FADV_DONTNEED)`.
replacedst
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