fix: decrement HashmapPidPageToMappingInfo metric on processPIDExit#1400
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Co-authored-by: Christos Kalkanis <christos.kalkanis@elastic.co>
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…open-telemetry#1400) Co-authored-by: Christos Kalkanis <christos.kalkanis@elastic.co>
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…open-telemetry#1400) (#79) Co-authored-by: Christos Kalkanis <christos.kalkanis@elastic.co>
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Summary
Recently, we observed some unusual behavior regarding the
HashmapPidPageToMappingInfometric.According to the graph, we reached 163M entries in the eBPF map at one point, which seems way too high. When inspecting the actual map with:
$ bpftool -j map show id 31184 {"id":11696,"type":"lpm_trie","name":"pid_page_to_map","flags":1,"bytes_key":16,"bytes_value":16,"max_entries":1048576,"bytes_memlock":2120920,"frozen":0,"btf_id":99410}We are supposed to have a maximum of ~1M entries, so this value is definitely off.
Validating the changes
I tested by running both the unpatched and patched versions on separate nodes with identical workloads.
Without fix
With fix