Hi, this patch series refactors the reftable backend to reuse reftable iterators when reading random references. This removes the overhead of having to recreate the iterator on every read and thus leads to better performance and less allocation churn. It also gives us the ability to further optimize reads by optimizing re-seeking iterators in the future. Overall this leads to a 7% speedup when creating many refs in a transaction, which performs many random reads. But this change also positively impacts other usecases. Thanks! Patrick Patrick Steinhardt (8): refs/reftable: encapsulate reftable stack refs/reftable: handle reloading stacks in the reftable backend refs/reftable: read references via `struct reftable_backend` refs/reftable: refactor reading symbolic refs to use reftable backend refs/reftable: refactor reflog expiry to use reftable backend reftable/stack: add mechanism to notify callers on reload reftable/merged: drain priority queue on reseek refs/reftable: reuse iterators when reading refs refs/reftable-backend.c | 356 ++++++++++++++++++------------- reftable/merged.c | 2 + reftable/reftable-stack.h | 3 + reftable/reftable-writer.h | 9 + reftable/stack.c | 9 + t/unit-tests/t-reftable-merged.c | 73 +++++++ 6 files changed, 308 insertions(+), 144 deletions(-) -- 2.47.0.229.g8f8d6eee53.dirty
