use glibc buildimage for custom clang #35617
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brycekahle
added
changelog/no-changelog
team/ebpf-platform
qa/done
github-actions
bot
added
component/system-probe
medium review
spencergilbert
approved these changes
Mar 28, 2025
This PR doesn't use the new built clang yet. I'll do that in a future PR, so I'll make sure it has that change and doesn't break. |
ofek
approved these changes
Mar 28, 2025
Gitlab CI Configuration Changes
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| Removed | Modified | Added | Renamed |
|---|---|---|---|
| 0 | 22 | 0 | 0 |
ℹ️ Diff available in the job log.
Uncompressed package size comparisonComparison with ancestor Diff per package
Decision✅ Passed |
Regression DetectorRegression Detector ResultsMetrics dashboard Baseline: 38b97cb Optimization Goals: ✅ No significant changes detected
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| perf | experiment | goal | Δ mean % | Δ mean % CI | trials | links |
|---|---|---|---|---|---|---|
| ➖ | uds_dogstatsd_to_api_cpu | % cpu utilization | +2.57 | [+1.68, +3.45] | 1 | Logs |
| ➖ | otlp_ingest_traces | memory utilization | +2.15 | [+1.76, +2.54] | 1 | Logs |
| ➖ | tcp_syslog_to_blackhole | ingress throughput | +1.10 | [+1.03, +1.16] | 1 | Logs |
| ➖ | quality_gate_logs | % cpu utilization | +0.49 | [-2.30, +3.28] | 1 | Logs |
| ➖ | quality_gate_idle | memory utilization | +0.10 | [+0.02, +0.18] | 1 | Logs bounds checks dashboard |
| ➖ | file_to_blackhole_300ms_latency | egress throughput | +0.03 | [-0.60, +0.66] | 1 | Logs |
| ➖ | tcp_dd_logs_filter_exclude | ingress throughput | +0.00 | [-0.01, +0.02] | 1 | Logs |
| ➖ | uds_dogstatsd_to_api | ingress throughput | -0.00 | [-0.28, +0.28] | 1 | Logs |
| ➖ | file_to_blackhole_0ms_latency_http2 | egress throughput | -0.01 | [-0.75, +0.73] | 1 | Logs |
| ➖ | file_to_blackhole_0ms_latency_http1 | egress throughput | -0.02 | [-0.81, +0.77] | 1 | Logs |
| ➖ | file_to_blackhole_0ms_latency | egress throughput | -0.03 | [-0.76, +0.71] | 1 | Logs |
| ➖ | file_to_blackhole_100ms_latency | egress throughput | -0.05 | [-0.76, +0.67] | 1 | Logs |
| ➖ | file_to_blackhole_1000ms_latency | egress throughput | -0.08 | [-0.84, +0.68] | 1 | Logs |
| ➖ | file_to_blackhole_500ms_latency | egress throughput | -0.13 | [-0.92, +0.67] | 1 | Logs |
| ➖ | file_to_blackhole_1000ms_latency_linear_load | egress throughput | -0.23 | [-0.70, +0.24] | 1 | Logs |
| ➖ | file_tree | memory utilization | -0.24 | [-0.46, -0.02] | 1 | Logs |
| ➖ | otlp_ingest_logs | memory utilization | -0.27 | [-0.43, -0.11] | 1 | Logs |
| ➖ | quality_gate_idle_all_features | memory utilization | -0.37 | [-0.50, -0.25] | 1 | Logs bounds checks dashboard |
| ➖ | uds_dogstatsd_20mb_12k_contexts_20_senders | memory utilization | -0.50 | [-0.56, -0.44] | 1 | Logs |
| ➖ | otlp_ingest_metrics | memory utilization | -0.55 | [-0.70, -0.40] | 1 | Logs |
Bounds Checks: ✅ Passed
| perf | experiment | bounds_check_name | replicates_passed | links |
|---|---|---|---|---|
| ✅ | file_to_blackhole_0ms_latency | lost_bytes | 10/10 | |
| ✅ | file_to_blackhole_0ms_latency | memory_usage | 10/10 | |
| ✅ | file_to_blackhole_0ms_latency_http1 | lost_bytes | 10/10 | |
| ✅ | file_to_blackhole_0ms_latency_http1 | memory_usage | 10/10 | |
| ✅ | file_to_blackhole_0ms_latency_http2 | lost_bytes | 10/10 | |
| ✅ | file_to_blackhole_0ms_latency_http2 | 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 | lost_bytes | 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 | intake_connections | 10/10 | bounds checks dashboard |
| ✅ | quality_gate_idle | memory_usage | 10/10 | bounds checks dashboard |
| ✅ | quality_gate_idle_all_features | intake_connections | 10/10 | bounds checks dashboard |
| ✅ | quality_gate_idle_all_features | memory_usage | 10/10 | bounds checks dashboard |
| ✅ | quality_gate_logs | intake_connections | 10/10 | |
| ✅ | 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:
-
Its estimated |Δ mean %| ≥ 5.00%, indicating the change is big enough to merit a closer look.
-
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.
-
Its configuration does not mark it "erratic".
CI Pass/Fail Decision
✅ Passed. All Quality Gates passed.
- quality_gate_logs, bounds check lost_bytes: 10/10 replicas passed. Gate passed.
- quality_gate_logs, bounds check intake_connections: 10/10 replicas passed. Gate passed.
- quality_gate_logs, bounds check memory_usage: 10/10 replicas passed. Gate passed.
- quality_gate_idle_all_features, bounds check intake_connections: 10/10 replicas passed. Gate passed.
- quality_gate_idle_all_features, bounds check memory_usage: 10/10 replicas passed. Gate passed.
- quality_gate_idle, bounds check intake_connections: 10/10 replicas passed. Gate passed.
- quality_gate_idle, bounds check memory_usage: 10/10 replicas passed. Gate passed.
Static quality checks ✅Please find below the results from static quality gates Successful checksInfo
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/merge |
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What does this PR do?
Uses the glibc buildimages to build the custom version of clang we use for ebpf compilation
Motivation
Standardizing on a buildimage
Describe how you validated your changes
Ran pipelines of full KMT suite using this new built version of clang.
Possible Drawbacks / Trade-offs
Additional Notes
Added versioning to the built clang, so we don't accidentally clobber anything. Currently doesn't force a
.separator, so that it is backwards compatible with the current filenames. A future PR will update to using only the versioned files.