[CWS] Fix cgroup dentry resolution for RHEL 7

[lebauce]

What does this PR do?

Fix the cgroup path resolution on RHEL 7 based kernels.

Motivation

When using cgroup v1, we were taking the base path of the path
but cgroup.procs was already stripped from the file, thus causing
a wrong resolution of the cgroup path.

Describe how you validated your changes

Possible Drawbacks / Trade-offs

Additional Notes

[agent-platform-auto-pr]

Test changes on VM

Use this command from test-infra-definitions to manually test this PR changes on a VM:

inv create-vm --pipeline-id=50253337 --os-family=ubuntu

Note: This applies to commit bf3aa30

[cit-pr-commenter]

Regression Detector

Regression Detector Results

Metrics dashboard
Target profiles
Run ID: 08495bb5-2aa2-41ad-bad0-82b6a8a674af

Baseline: def8858
Comparison: bf3aa30
Diff

Optimization Goals: ❌ Significant changes detected

perf	experiment	goal	Δ mean %	Δ mean % CI	trials	links
✅	basic_py_check	% cpu utilization	-11.18	[-14.90, -7.47]	1	Logs

Fine details of change detection per experiment

perf	experiment	goal	Δ mean %	Δ mean % CI	trials	links
➖	quality_gate_idle_all_features	memory utilization	+1.28	[+1.15, +1.41]	1	Logs bounds checks dashboard
➖	quality_gate_logs	% cpu utilization	+1.22	[-1.75, +4.19]	1	Logs
➖	uds_dogstatsd_to_api_cpu	% cpu utilization	+0.92	[+0.19, +1.66]	1	Logs
➖	file_tree	memory utilization	+0.37	[+0.22, +0.52]	1	Logs
➖	file_to_blackhole_300ms_latency	egress throughput	+0.09	[-0.54, +0.72]	1	Logs
➖	file_to_blackhole_1000ms_latency_linear_load	egress throughput	+0.01	[-0.45, +0.47]	1	Logs
➖	uds_dogstatsd_to_api	ingress throughput	+0.01	[-0.10, +0.11]	1	Logs
➖	tcp_dd_logs_filter_exclude	ingress throughput	-0.00	[-0.01, +0.01]	1	Logs
➖	file_to_blackhole_100ms_latency	egress throughput	-0.02	[-0.73, +0.70]	1	Logs
➖	file_to_blackhole_0ms_latency	egress throughput	-0.06	[-0.85, +0.72]	1	Logs
➖	file_to_blackhole_1000ms_latency	egress throughput	-0.20	[-0.99, +0.58]	1	Logs
➖	otel_to_otel_logs	ingress throughput	-0.27	[-0.95, +0.40]	1	Logs
➖	quality_gate_idle	memory utilization	-0.36	[-0.41, -0.32]	1	Logs bounds checks dashboard
➖	file_to_blackhole_500ms_latency	egress throughput	-0.37	[-1.14, +0.39]	1	Logs
➖	tcp_syslog_to_blackhole	ingress throughput	-1.07	[-1.13, -1.01]	1	Logs
➖	pycheck_lots_of_tags	% cpu utilization	-1.50	[-5.00, +2.00]	1	Logs
✅	basic_py_check	% cpu utilization	-11.18	[-14.90, -7.47]	1	Logs

Bounds Checks: ❌ Failed

perf	experiment	bounds_check_name	replicates_passed	links
❌	file_to_blackhole_0ms_latency	lost_bytes	8/10
❌	file_to_blackhole_300ms_latency	lost_bytes	9/10
✅	file_to_blackhole_0ms_latency	memory_usage	10/10
✅	file_to_blackhole_1000ms_latency	memory_usage	10/10
✅	file_to_blackhole_1000ms_latency_linear_load	memory_usage	10/10
✅	file_to_blackhole_100ms_latency	lost_bytes	10/10
✅	file_to_blackhole_100ms_latency	memory_usage	10/10
✅	file_to_blackhole_300ms_latency	memory_usage	10/10
✅	file_to_blackhole_500ms_latency	lost_bytes	10/10
✅	file_to_blackhole_500ms_latency	memory_usage	10/10
✅	quality_gate_idle	memory_usage	10/10	bounds checks dashboard
✅	quality_gate_idle_all_features	memory_usage	10/10	bounds checks dashboard
✅	quality_gate_logs	lost_bytes	10/10
✅	quality_gate_logs	memory_usage	10/10

Explanation

Confidence level: 90.00%
Effect size tolerance: |Δ mean %| ≥ 5.00%

Performance changes are noted in the perf column of each table:

• ✅ = significantly better comparison variant performance
• ❌ = significantly worse comparison variant performance
• ➖ = no significant change in performance

A regression test is an A/B test of target performance in a repeatable rig, where "performance" is measured as "comparison variant minus baseline variant" for an optimization goal (e.g., ingress throughput). Due to intrinsic variability in measuring that goal, we can only estimate its mean value for each experiment; we report uncertainty in that value as a 90.00% confidence interval denoted "Δ mean % CI".

For each experiment, we decide whether a change in performance is a "regression" -- a change worth investigating further -- if all of the following criteria are true:

1. Its estimated |Δ mean %| ≥ 5.00%, indicating the change is big enough to merit a closer look.

2. Its 90.00% confidence interval "Δ mean % CI" does not contain zero, indicating that if our statistical model is accurate, there is at least a 90.00% chance there is a difference in performance between baseline and comparison variants.

3. Its configuration does not mark it "erratic".

CI Pass/Fail Decision

✅ Passed. All Quality Gates passed.

• quality_gate_idle, bounds check memory_usage: 10/10 replicas passed. Gate passed.
• quality_gate_idle_all_features, bounds check memory_usage: 10/10 replicas passed. Gate passed.
• quality_gate_logs, bounds check lost_bytes: 10/10 replicas passed. Gate passed.
• quality_gate_logs, bounds check memory_usage: 10/10 replicas passed. Gate passed.

[lebauce]

/merge

[dd-devflow]

Devflow running: /merge

View all feedbacks in Devflow UI.

---

2024-12-03 12:07:41 UTC ℹ️ MergeQueue: pull request added to the queue

The median merge time in main is 24m.

[agent-platform-auto-pr]

The backport to 7.61.x failed:

The process '/usr/bin/git' failed with exit code 1

To backport manually, run these commands in your terminal:

# Fetch latest updates from GitHub
git fetch
# Create a new working tree
git worktree add .worktrees/backport-7.61.x 7.61.x
# Navigate to the new working tree
cd .worktrees/backport-7.61.x
# Create a new branch
git switch --create backport-31666-to-7.61.x
# Cherry-pick the merged commit of this pull request and resolve the conflicts
git cherry-pick -x --mainline 1 d667639fb43d0e417ad9207bfbd9de78af52022e
# Push it to GitHub
git push --set-upstream origin backport-31666-to-7.61.x
# Go back to the original working tree
cd ../..
# Delete the working tree
git worktree remove .worktrees/backport-7.61.x

Then, create a pull request where the base branch is 7.61.x and the compare/head branch is backport-31666-to-7.61.x.