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authorAyush Ranjan <ayushranjan@google.com>2021-05-01 12:36:09 -0700
committergVisor bot <gvisor-bot@google.com>2021-05-01 12:37:49 -0700
commit7cafac9f42a8355e7192b57fcc8d41e31d836c53 (patch)
tree8911b4dc0d124eb00a797cf203ba200080293173 /test/syscalls
parentcde8e8b7a905ce53fe72a1a71b86e9ef352bbc3a (diff)
[perf] Check caching on IncRef'd dentries before the others.
When a child is added to a parent (directory) dentry, both child and parent are queued for checkCachingLocked(). Make sure that the parent is queued first because the parent gained a ref and so could be removed from the LRU cache hence making space for the new child. This could prevent an LRU cache eviction. In practice, this did seem to help. ~800 RPCs were reduced while building //absl/... (ABSL build benchmark). Evictions hurt in 2 ways - create renameMu contention and destroy a possibly useful dentry which will have to be re-walked and re-opened later. Follow up fix for #5859. PiperOrigin-RevId: 371509392
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