Dropping eBPF CPU Cost by About 90% with Memoization (Not AI Gen)

Automated excerpt

We then reconstruct the path, walk up parent dentries, and check whether the file or any ancestor directory has a matching policy. Our cache key has three fields: the mount namespace ID, the mount ID, and the inode number. We can’t cache the inode by itself because inode numbers are unique to a specific mount tree (so if a policy covers multiple mount trees, inodes could overlap). The mount namespace ID also prevents us from using cached entries in a different namespace. The cache value has two parts: an access_index and a cache state.

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