feat: limit i/o related events #153
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- ebpf path resolution simplified - compute a hash for path during resolution - introduce path::MapKey struct to generate a unique key to be used in ebpf HashMap - better error handling in ebpf - change Path::eq implementation to be more correct - small changes in shim to access qstr hash and len members from struct
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Summary of Changes in This PR
This PR addresses the need to throttle I/O events to prevent event loss, which can disrupt Kunai's eBPF-based correlation mechanisms.
Event loss is problematic because Kunai relies on eBPF events to allocate and free structures used for correlation. Missing crucial events may lead to incomplete correlations or memory leaks.
I/O events, being among the fastest, can easily generate tens of thousands of events per second, quickly saturating the event buffer.
Implemented Filtering Strategies
To mitigate event loss, this PR introduces the following filtering mechanisms:
write_closeevents: Prevents redundant events from overwhelming the buffer.These strategies aim to maintain efficient event processing while preserving crucial correlations.