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Chris LuandGitHub
216b52c13a
* perf(mount): add graduated write backpressure before buffer cap Introduce soft (80%) and hard (95%) throttling thresholds in WriteBufferAccountant. When write buffer usage approaches the cap, Reserve() inserts brief sleeps to slow writers gradually rather than blocking them completely at the cap. This smooths out write latency under sustained load. * fix(mount): address review feedback for graduated backpressure - Use projected usage (used + n) for threshold checks so a single reservation crossing a threshold is throttled immediately. - Widen no-throttle test timing tolerance to softThrottleDelay to avoid CI flakes from scheduling jitter. - Replace fragile timing upper-bound in recovery test with counter-based invariant (hardThrottleCount stays at 1). * docs(mount): clarify single-shot throttle design in WriteBufferAccountant Add a comment explaining why graduated throttling runs once per Reserve call rather than inside the blocking loop: once at the cap, the evictor + cond.Wait mechanism frees actual capacity, which time-based sleeps cannot do.