[XPTI][INFRA] Fixes race issues with Emhash under contention #19600
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tovinkere
commented
Jul 25, 2025
tovinkere
commented
- Under severe concurrent access, rehash in Emhash was being called during insert and this is documented as a problem in Emhash Readme. Rehash for the Emhash containers will not have to be called now as enough space for handling streams is reserved.
- xptiCheckTraceEnabled() is now thread-safe
- Emhash containers now have sizes reserved to accommodate the entries and all second level hash maps that were Emhash in the past have been replaced with parallel hashmap.
- xptiCheckTraceEnabled() is now thread-safe - Emash can have issues when rehash is called during insertion. So, all Emhash containers now have sizes reserved to accommodate the entries and all second level hash maps use parallel hashmap. - Under severe concurrent access, rehash in Emhash was being called during insert. Rehash for the Emhash containers will not have to be called now. Signed-off-by: Vasanth Tovinkere <[email protected]>
Signed-off-by: Vasanth Tovinkere <[email protected]>
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Looks reasonable, but I'm not familiar with the code. @KseniyaTikhomirova , FYI, maybe for a post-commit review?
xptifw/src/xpti_trace_framework.cpp
Outdated
| @@ -1562,12 +1565,14 @@ class Notifications { | |||
| } | |||
| } | |||
| #endif | |||
| { | |||
| std::unique_lock<std::shared_mutex> Lock(MFlagsLock); | |||
| auto &TraceFlags = MStreamFlags[StreamID]; // Get the trace flags for the | |||
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Signed-off-by: Vasanth Tovinkere <[email protected]>
aelovikov-intel
approved these changes
Jul 25, 2025
sarnex
approved these changes
Jul 25, 2025
Signed-off-by: Vasanth Tovinkere <[email protected]>
|
Fail seems to be covered by #15207. |
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