optimize: reduce unnecessary function calls#5048
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haytok
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Jul 7, 2026
Signed-off-by: ningmingxiao <[email protected]>
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Pull request overview
This PR targets the startup-time regression reported in #5047 by reducing repeated container label lookups during healthcheck setup and avoiding unnecessary task.Wait() work in detach mode.
Changes:
- Extend healthcheck timer APIs (
CreateTimer/StartTimer) to accept an already-fetched labels map, and update extraction logic to reuse it. - Update container start/run/unpause paths to pass cached labels and skip healthcheck setup when no healthcheck label is present.
- Adjust
nerdctl runflow to avoid callingtask.Wait()in detach mode (but currently introduces a wait/start ordering risk for non-detach).
Reviewed changes
Copilot reviewed 6 out of 6 changed files in this pull request and generated 2 comments.
Show a summary per file
| File | Description |
|---|---|
| pkg/healthcheck/healthcheck_manager_linux.go | Reuses caller-provided labels to avoid repeated container.Labels() calls during healthcheck timer setup. |
| pkg/healthcheck/healthcheck_manager_windows.go | Updates stub signatures to match new healthcheck API. |
| pkg/healthcheck/healthcheck_manager_freebsd.go | Updates stub signatures to match new healthcheck API. |
| pkg/healthcheck/healthcheck_manager_darwin.go | Updates stub signatures to match new healthcheck API. |
| pkg/containerutil/containerutil.go | Passes cached labels into healthcheck setup and skips healthcheck work when not configured. |
| cmd/nerdctl/container/container_run.go | Skips task.Wait() for detach runs and passes cached labels into healthcheck setup. |
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| if hcStr, ok := lab[labels.HealthCheck]; ok && hcStr != "" { | ||
| // If container has health checks configured, create and start systemd timer/service files. | ||
| if err := healthcheck.CreateTimer(ctx, container, cfg, nerdctlCmd, nerdctlArgs, lab); err != nil { | ||
| return fmt.Errorf("failed to create healthcheck timer: %w", err) | ||
| } |
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| statusC, err := task.Wait(ctx) | ||
| if err != nil { | ||
| return err | ||
| } |
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you can see
https://github.com/containerd/containerd/blob/v2.3.3/cmd/ctr/commands/run/run.go#L249
@haytok
here we don't need to wait container exited
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reduce about 100ms
ref:#5047