Sync internal commits 2024-09-06 #75
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If we have a cache miss, any meta in this object is invalid. Unset it so that we don't use it later.
Includes-commit: 0560e0f Replicated-from: cloudflare#356
Co-authored-by: Derek Argueta <[email protected]>
Includes-commit: 9a934bc Replicated-from: cloudflare#360
This has the effect of reducing a warning log since we are not leaving the lock dangling for the next reader.
This changes the memory ordering for the lock status load to `SeqCst` from
`Relaxed` to eliminate a potential source of panics.
Panics had the frames:
```
pingora_proxy::proxy_cache::<T>::handle_lock_status (proxy_cache.rs:748)
pingora_proxy::proxy_cache::<T>::proxy_cache::{{closure}} (proxy_cache.rs:211)
pingora_proxy::HttpProxy<T>::process_request::{{closure}} (lib.rs:509)
pingora_proxy::HttpProxy<T>::process_new_http::{{closure}} (lib.rs:727)
```
which showed we were checking on the status of the lock, after waiting on it,
and still seeing its status as waiting. The status is returned by value, so this
is not a time-of-check to time-of-use problem, this is an inconsistency in how
the lock status is managed. The change in memory order is mostly for the sake of
this programmer's attempts to understand what is happening.
This also completes a couple of TODOs to limit the wait period as well as tag
the span with the lock status.
CodSpeed Performance ReportMerging #75 will not alter performanceComparing Summary
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This pull request was created automatically by CodSpeed to track performance changes of the pull request cloudflare/pingora#375.
The original branch is upstream/ewang/2024-09-06