bpf,datapath: read jiffies from /proc/schedstat #25795
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The Cilium agent has been throwing the 'Auto-disabling "enable-bpf-clock-probe" feature since kernel doesn't expose /proc/timer_list' warning for a while now. Since /proc/timer_list is not available under the default k8s SecurityContext and Docker also masks the file by default, read it from /proc/schedstat instead. Reuse the existing parsing code from probes.KernelHZ to obtain the value. Signed-off-by: Timo Beckers <timo@isovalent.com>
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rgo3
approved these changes
May 31, 2023
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Probably should have asked that back when we introduced the probe that relies on /proc/schedstat: Should we add CONFIG_SCHEDSTATS=y as a system requirement (for certain features) somewhere? I just realized that it's not set on my kernel and I'm missing /proc/schedstat.
borkmann
approved these changes
May 31, 2023
I think we should document it at https://docs.cilium.io/en/stable/operations/system_requirements/#linux-kernel. |
This was referenced Jun 13, 2023
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The Cilium agent has been throwing the 'Auto-disabling "enable-bpf-clock-probe" feature since kernel doesn't expose /proc/timer_list' warning for a while now.
Since /proc/timer_list is not available under the default k8s SecurityContext and Docker also masks the file by default, read it from /proc/schedstat instead.
Reuse the existing parsing code from probes.KernelHZ to obtain the value.
Fixes: #25463
Backporting to 1.13 only since 1.12 doesn't have the new /proc/schedstat reader infra yet.