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f90c10260f
Add CAP_PERFMON to AmbientCapabilities in capabilities.conf, to enable perf_event based stall detector in Seastar. However, on Debian/Ubuntu CAP_PERFMON with non-root user does not work because it sets kernel.perf_event_paranoid=4 which disallow all non-root user access. (On Debian it kernel.perf_event_paranoid=3) So we need to configure kernel.perf_event_paranoid=2 on these distros. see: https://askubuntu.com/questions/1400874/what-does-perf-paranoia-level-four-do Also, CAP_PERFMON is only available on linux-5.8+, older kernel does not have this capability. To enable older kernel environment such as CentOS7, we need to configure kernel.perf_event_paranoid=1 to allow non-root user access even without the capability. Fixes #15743 Closes scylladb/scylladb#16070