Remove usage of weak-value-source for smart-open-scope references #58212
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dibarbet
approved these changes
Dec 9, 2021
sharwell
reviewed
Dec 9, 2021
| @@ -32,7 +29,7 @@ public IWorkspaceService CreateService(HostWorkspaceServices workspaceServices) | |||
| if (_singleton == null) | |||
| { | |||
| var temporaryStorage = workspaceServices.GetService<ITemporaryStorageService>(); | |||
| Interlocked.CompareExchange(ref _singleton, new VisualStudioMetadataReferenceManager(workspaceServices.Workspace, _serviceProvider, temporaryStorage), null); | |||
| Interlocked.CompareExchange(ref _singleton, new VisualStudioMetadataReferenceManager(_serviceProvider, temporaryStorage), null); | |||
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❗ This incorrectly provides a VisualStudioMetadataReferenceManager using the ITemporaryStorageService from an unrelated workspace. The cache field needs to be removed.
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This bug isn't introduced by this pull request, but if you aren't fixing it here please file a bug for the 17.1 release.
ghost
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A/B testing (2000 people in each group) revealed no interesting change from just turning this off. My theory here is that for projecs that reference dlls from standard runtime locations, there is very little removal of said dlls, and the compiler ends up rooting all these assemblies anyways through any metadata symbols we have.
Also, because we are using the open-scope-system, the platform effectively does hteir memory mapping once and keeps that memory around forever (in case other components need it, or roslyn needs it again). So that is also effectively a fixed cost that won't ever be given back.