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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
38 lines
1013 B
Bash
38 lines
1013 B
Bash
#!/bin/bash
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#
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# Copyright (C) 2023-present ScyllaDB
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#
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#
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# SPDX-License-Identifier: AGPL-3.0-or-later
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#
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version_ge() {
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[ "$2" = "`echo -e "$1\n$2" | sort -V | head -n1`" ]
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}
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KERNEL_VER=$(uname -r)
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if ! version_ge $KERNEL_VER 5.8; then
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# On older kernel environment, we have to relax perf_event_paranoid setting
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# since there is no CAP_PERFMON.
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PERF_EVENT_PARANOID=1
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elif [ $(cat /proc/sys/kernel/perf_event_paranoid) -ge 3 ]; then
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# On Debian/Ubuntu, it deny access from non-root even with CAP_PERFMON
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# It requires to set perf_event_paranoid=2 to use CAP_PERFMON with non-root
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PERF_EVENT_PARANOID=2
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fi
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if [ -n "$PERF_EVENT_PARANOID" ]; then
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cat << EOS > /etc/sysctl.d/99-scylla-perfevent.conf
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kernel.perf_event_paranoid = $PERF_EVENT_PARANOID
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EOS
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sysctl -p /etc/sysctl.d/99-scylla-perfevent.conf
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fi
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if [ ! -d /run/systemd/system ]; then
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exit 0
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fi
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systemctl --system daemon-reload >/dev/null || true
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systemctl --system enable --now scylla-tune-sched.service || true
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