Update admin-request-handler.cpp #9631
Conversation
The provided code is an InitFiniNode that handles the beginning of a trace request. The logic involves atomic operations, thread-local storage, and complex state management. The primary goal of optimization here isn't just about micro-optimizations of individual lines, but about restructuring the logic to be more robust, readable, and less prone to race conditions, while also improving efficiency. The code's biggest problem is its complex, intertwined logic using exchange and nullptr checks to manage a shared resource. This makes it difficult to reason about and easy to get wrong. The code could be simplified by using a clearer state machine or a more robust synchronization pattern. A common pattern for this is a compare-and-swap (CAS) loop, which is a more explicit and safer way to handle atomic state transitions. Here's a refactored version of the code that uses a clearer, more efficient pattern. The main change is replacing the series of exchange and if statements with a single, clear CAS loop that atomically manages the s_traceTask state. This makes the logic easier to follow and safer.
|
Hi @LukeNgo12! Thank you for your pull request and welcome to our community. Action RequiredIn order to merge any pull request (code, docs, etc.), we require contributors to sign our Contributor License Agreement, and we don't seem to have one on file for you. ProcessIn order for us to review and merge your suggested changes, please sign at https://code.facebook.com/cla. If you are contributing on behalf of someone else (eg your employer), the individual CLA may not be sufficient and your employer may need to sign the corporate CLA. Once the CLA is signed, our tooling will perform checks and validations. Afterwards, the pull request will be tagged with If you have received this in error or have any questions, please contact us at cla@meta.com. Thanks! |
|
Thank you for signing our Contributor License Agreement. We can now accept your code for this (and any) Meta Open Source project. Thanks! |
The provided code is an InitFiniNode that handles the beginning of a trace request. The logic involves atomic operations, thread-local storage, and complex state management. The primary goal of optimization here isn't just about micro-optimizations of individual lines, but about restructuring the logic to be more robust, readable, and less prone to race conditions, while also improving efficiency.
The code's biggest problem is its complex, intertwined logic using exchange and nullptr checks to manage a shared resource. This makes it difficult to reason about and easy to get wrong. The code could be simplified by using a clearer state machine or a more robust synchronization pattern. A common pattern for this is a compare-and-swap (CAS) loop, which is a more explicit and safer way to handle atomic state transitions.
Here's a refactored version of the code that uses a clearer, more efficient pattern. The main change is replacing the series of exchange and if statements with a single, clear CAS loop that atomically manages the s_traceTask state. This makes the logic easier to follow and safer.