Cgroup scripts #423
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Cgroup scripts #423
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osandov
reviewed
Oct 1, 2024
Current implementation iterates only online csses. a) This diverges from the equivalent kernel functions that do include offlined csses b) Debugger on live system cannot ensure that an online object remains such during further processing. Convert known callers to do online filtering themselves to keep their semantics (this is still racy wrt cgroup removal/subsys disabling as the original code). Signed-off-by: Michal Koutný <[email protected]> Revert "helpers/cgroup: Allow iteration of offlined css too" use kernel-like interface instead This reverts commit 99a344c.
Prepare for additional operations on cgroups. This rework breaks previously accepted order of arguments '<cgroup> bpf' and requires specifying the intended command. (No cgroups fall back to root cgrp.) Signed-off-by: Michal Koutný <[email protected]>
Print information about cgroup_subsys_state counts associated with given cgroup. The main purpose is to show subsys structs in offline state on cgroup v2. Signed-off-by: Michal Koutný <[email protected]>
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Force pushed a change addressing the review. |
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This is based on discussion around cgroup.stat and as an exercise with drgn, I'm sharing it in the case anyone found that useful.
There is also a little change outside of
contrib/.BTW How is that with drgn and RCU protected data? Is it simply neglected and one should be ready for transient issues when dereferencing gone data (that's actually not specific to RCU) when debugging a running system?