[codex] raise Treeland service resource priority

[deepin-wm]

Raise Treeland DDM-mode systemd service to highest normal CPU, I/O, and OOM-protection priorities. Move dde-seatd socket environment ownership to treeland.service.

Changes:

• Add Environment=SEATD_SOCK=/run/dde-seatd.sock to own the seatd socket configuration
• Change OOMScoreAdjust=-300 to OOMScoreAdjust=-1000 (maximum protection)
• Change Nice=-15 to Nice=-20 (highest nice priority)
• Add CPUWeight=10000 (high CPU weight)
• Add CPUSchedulingPolicy=rr (round-robin realtime scheduling)
• Add CPUSchedulingPriority=20 (realtime priority level)
• Add IOWeight=10000 (high I/O weight)
• Add IOSchedulingClass=realtime (realtime I/O scheduling)
• Add IOSchedulingPriority=0 (highest I/O priority)

This PR replaces closed PR #932 which was targeting the old/master branch.

Summary by Sourcery

Increase Treeland systemd service runtime priority and assume ownership of seatd socket configuration.

Enhancements:

• Raise Treeland service CPU, I/O, and OOM-protection priorities to highest normal levels in its systemd unit.
• Configure the Treeland service to own the SEATD_SOCK environment for the dde-seatd socket.

[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

This PR updates the Treeland systemd unit to run with maximum normal CPU, I/O, and OOM protection priorities, and moves ownership of the dde-seatd socket environment into treeland.service itself.

File-Level Changes

Change	Details	Files
Elevate Treeland systemd service runtime priorities and own the seatd socket configuration.	Add SEATD_SOCK environment variable to the service to own the dde-seatd socket configuration. Increase OOM protection by changing OOMScoreAdjust from -300 to -1000. Increase CPU scheduling priority by changing Nice from -15 to -20. Add CPUWeight=10000 to give the service maximum CPU weight. Enable realtime CPU scheduling via CPUSchedulingPolicy=rr with CPUSchedulingPriority=20. Add IOWeight=10000 to give the service maximum I/O weight. Enable realtime I/O scheduling via IOSchedulingClass=realtime with IOSchedulingPriority=0.	misc/systemd/treeland.service.in

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[github-actions]

CLA Assistant Lite bot All contributors have signed the CLA ✍️ ✅

[sourcery-ai]

Hey - I've left some high level feedback:

• Consider whether using realtime CPU and I/O scheduling (CPUSchedulingPolicy=rr, CPUSchedulingPriority=20, IOSchedulingClass=realtime) is strictly necessary, as this can starve other system services; if it is, it may be safer to gate these settings behind a separate unit or drop-in so distributions can opt-in.
• Hardcoding SEATD_SOCK to /run/dde-seatd.sock in the main service unit may make it harder for downstreams with different seatd setups; consider making this path configurable via a drop-in or using a more generic environment reference.
• With both Nice=-20 and CPUWeight=10000 set, the intent for CPU prioritization may not be obvious to future maintainers; adding a brief comment in the unit file explaining why both mechanisms are used and how they’re expected to interact could clarify the design.

Prompt for AI Agents

Please address the comments from this code review:

## Overall Comments
- Consider whether using realtime CPU and I/O scheduling (CPUSchedulingPolicy=rr, CPUSchedulingPriority=20, IOSchedulingClass=realtime) is strictly necessary, as this can starve other system services; if it is, it may be safer to gate these settings behind a separate unit or drop-in so distributions can opt-in.
- Hardcoding SEATD_SOCK to /run/dde-seatd.sock in the main service unit may make it harder for downstreams with different seatd setups; consider making this path configurable via a drop-in or using a more generic environment reference.
- With both Nice=-20 and CPUWeight=10000 set, the intent for CPU prioritization may not be obvious to future maintainers; adding a brief comment in the unit file explaining why both mechanisms are used and how they’re expected to interact could clarify the design.

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[deepin-wm]

I have read the CLA Document and I hereby sign the CLA.