0750107074
Previously, FileSet would cache the last *File found by a lookup, using a full (exclusive) mutex within FileSet.File, turning a logical read operation into an update. This was one of the largest sources of contention in gopls. This change uses atomic load/store on the 'last' field without a mutex. Also, in FileSet.AddFile, allocate the File outside the critical section; all the other operations are typically cheap. Fixes #53507 Change-Id: Ice8641650d8495b25b0428e9b9320837ff2ca7e1 Reviewed-on: https://go-review.googlesource.com/c/go/+/411909 Reviewed-by: Robert Findley <rfindley@google.com> Reviewed-by: Robert Griesemer <gri@google.com> TryBot-Result: Gopher Robot <gobot@golang.org> |
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