realtime:rtl:all_topics
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realtime:rtl:all_topics [2017/10/05 20:25] tglx Update to current state of affairs |
realtime:rtl:all_topics [2025/01/07 11:19] (current) bigeasy All initial items are covered. Some rework is outstanding. |
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| ===== Changes to current kernel functionality ===== | ===== Changes to current kernel functionality ===== | ||
| - | * The CPU hotplug code needs an overhaul in general - Mostly done | + | * The CPU hotplug code needs an overhaul in general - Done |
| - | * Some of the existing timer infrastructure needs to be rewritten - Initial problems solved, still work in progress | + | * Some of the existing timer infrastructure needs to be rewritten - Mostly done. |
| * Pagefault disable/enable handling (the kernel pagefault disable/enable mechanism is not RT compatible. Rework it to fit RT) - Done | * Pagefault disable/enable handling (the kernel pagefault disable/enable mechanism is not RT compatible. Rework it to fit RT) - Done | ||
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| ===== Extensions to current kernel functionality ===== | ===== Extensions to current kernel functionality ===== | ||
| - | * kmap infrastructure – adaption to make it RT compatible - Open item, no real benefit for mainline so it's postponed to the 'RT only section' | + | * kmap infrastructure – adaption to make it RT compatible - Done |
| - | * Additional annotation mechanisms are necessary which allow RT to substitute functionality. (Such annotations are useful in general even for non-RT as they add value by making the code clearer and the scope of functionality documented) - Work in progress | + | * Additional annotation mechanisms are necessary which allow RT to substitute functionality. (Such annotations are useful in general even for non-RT as they add value by making the code clearer and the scope of functionality documented) - Done. |
| - | * Extending debug infrastructure, e.g. lockdep to handle the new lock types. - Open item, partial issues solved | + | * Extending debug infrastructure, e.g. lockdep to handle the new lock types. - Mostly done. |
| ===== Redesigning RT components ===== | ===== Redesigning RT components ===== | ||
| * Make use of the new annotation mechanisms | * Make use of the new annotation mechanisms | ||
| - | * Soft interrupt handling – structure must be adopted to be RT compatible | + | * Soft interrupt handling – structure must be adopted to be RT compatible. Work is done. A fain grain locking is work in progress. |
| - | * Reader/writer lock handling - they are not scalable on RT. Find a scalable solution - Replacement exists but might need to be revisited | + | * Reader/writer lock handling - they are not scalable on RT. Find a scalable solution. A rework is done with multiple reader. Only the writer gets a PI boost. |
| * Hotplug interaction – find a proper solution able to be compatible with RT requirements - Solved | * Hotplug interaction – find a proper solution able to be compatible with RT requirements - Solved | ||
| - | * Timer interaction – rework the kernel architecture to be compatible with RT requirements - Partially solved, work in progress | + | * Timer interaction – rework the kernel architecture to be compatible with RT requirements - Done. |
| - | * More palatable approach to RT friendly memory management - develop an upstream acceptable solution for the RT requirements - work in progress | + | * More palatable approach to RT friendly memory management - develop an upstream acceptable solution for the RT requirements. Done. |
| Various details which do not fit into any of the above categories, but need to be addressed to make RT upstream acceptable | Various details which do not fit into any of the above categories, but need to be addressed to make RT upstream acceptable | ||
realtime/rtl/all_topics.1507235157.txt.gz · Last modified: 2017/10/05 20:25 by tglx
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