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report: add cgroup metrics in a separate varlink service (#41489)

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Add CpuUsage, MemoryUsage, IOReadBytes, IOReadOperations, and
TasksCurrent in a standalone socket-activated varlink service. These
metrics are gathered from the kernel via cgroup files and PID1's only
role is mapping unit names to cgroup paths — a separate process can
query PID1 once for that mapping and then read the cgroup files
directly, minimizing PID1 involvement.

The new systemd-report-cgroup-metrics service listens at
/run/systemd/report/io.systemd.CGroup and exposes:
  - io.systemd.CGroup.CpuUsage
  - io.systemd.CGroup.IOReadBytes
  - io.systemd.CGroup.IOReadOperations
  - io.systemd.CGroup.MemoryUsage (with type=current/available/peak)
  - io.systemd.CGroup.TasksCurrent

This is spun out of #41078 and based on top of it. Will rebase once
that's merged.
This commit is contained in:
Lennart Poettering
2026-04-10 12:10:06 +02:00
committed by GitHub
parent dd80e5a348 8c65fe4fa1
commit 554ba32d30
13 changed files with 760 additions and 35 deletions
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test/units/TEST-74-AUX-UTILS.report.sh
+7
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@@ -30,6 +30,13 @@ REPORT=/usr/lib/systemd/systemd-report
"$REPORT" describe-metrics io.systemd piff
"$REPORT" describe-metrics piff
# test io.systemd.CGroup Metrics
systemctl start systemd-report-cgroup.socket
varlinkctl info /run/systemd/report/io.systemd.CGroup
varlinkctl list-methods /run/systemd/report/io.systemd.CGroup
varlinkctl --more call /run/systemd/report/io.systemd.CGroup io.systemd.Metrics.List {}
varlinkctl --more call /run/systemd/report/io.systemd.CGroup io.systemd.Metrics.Describe {}
# test io.systemd.Network Metrics
varlinkctl info /run/systemd/report/io.systemd.Network
varlinkctl list-methods /run/systemd/report/io.systemd.Network