[SharedCache] Cache references to type libraries#6195
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`SharedCache::FindSymbolAtAddrAndApplyToAddr` significantly impacts loading and analysis of DSC libraries. Its a hot path and the main cause of its slow execution time is the loading of a type library by name. By caching references to type libraries this function spends 90%+ less time executing. The cache is a global because `SharedCache` gets destoryed and re-created alot so I think this is the best place to store cached references. The downside to this is it'll cause a memory leak as I map entries using the view session ID. Entries won't be removed once the view is closed as I'm unsure how to do this. That said I think the performance benefits far outway the potential memory leak which will likely have no noticeable affect on the user experience of BN memory consumption.
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I was thinking about this after you mentioned it was a bottleneck on bdash#2. I noticed that the way that some of the current view-specific state, including the mutexes, are accessed has a data race. I ended up implementing a very similar change (#6196) that fixes those data races and is able to free memory when the shared cache is closed. |
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Closed in favour of #6196 |
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SharedCache::FindSymbolAtAddrAndApplyToAddrsignificantly impacts loading and analysis of DSC libraries. Its a hot path and the main cause of its slow execution time is the loading of a type library by name. By caching references to type libraries this function spends 90%+ less time executing.The cache is a global because
SharedCachegets destroyed and re-created alot so I think this is the best place to store cached references. The downside to this is it'll cause a memory leak as I map entries using the view session ID. Entries won't be removed once the view is closed as I'm unsure how to do this. That said I think the performance benefits far outway the potential memory leak which will likely have no noticeable affect on the user experience or BN memory consumption.