realtime:rtl:all_topics
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realtime:rtl:all_topics [2017/02/08 11:14] anna-maria Add a backlink to RTL project main page |
realtime:rtl:all_topics [2017/10/05 20:25] (current) tglx Update to current state of affairs |
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| PREEMPT_RT mainlined since the RTL collaborative project started. The | PREEMPT_RT mainlined since the RTL collaborative project started. The | ||
| main reason for these changes is to simplify RT interaction and | main reason for these changes is to simplify RT interaction and | ||
| - | integration. The topics are split into different types and are listed | + | integration. The topics are split into different types. In addition |
| - | in the planned order. In addition to the topics listed, testing, | + | to the topics listed, testing, documentation, and LTS kernel support for |
| - | documentation, and LTS kernel support for the PREEMPT_RT patch have to | + | the PREEMPT_RT patch have to be done continuously. |
| - | be done continuously. | + | |
| ===== Changes to current kernel functionality ===== | ===== Changes to current kernel functionality ===== | ||
| - | * The CPU hotplug code needs an overhaul in general | + | * The CPU hotplug code needs an overhaul in general - Mostly done |
| - | * Some of the existing timer infrastructure needs to be rewritten | + | * Some of the existing timer infrastructure needs to be rewritten - Initial problems solved, still work in progress |
| - | * Pagefault disable/enable handling (the kernel pagefault disable/enable mechanism is not RT compatible. Rework it to fit RT) | + | * Pagefault disable/enable handling (the kernel pagefault disable/enable mechanism is not RT compatible. Rework it to fit RT) - Done |
| ===== Extensions to current kernel functionality ===== | ===== Extensions to current kernel functionality ===== | ||
| - | * kmap infrastructure – adaption to make it RT compatible | + | * kmap infrastructure – adaption to make it RT compatible - Open item, no real benefit for mainline so it's postponed to the 'RT only section' |
| - | * 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) | + | * 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 |
| - | * Extending debug infrastructure, e.g. lockdep to handle the new lock types. | + | * Extending debug infrastructure, e.g. lockdep to handle the new lock types. - Open item, partial issues solved |
| ===== Redesigning RT components ===== | ===== Redesigning RT components ===== | ||
| Line 26: | Line 24: | ||
| * 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 | ||
| - | * Reader/writer lock handling - they are not scalable on RT. Find a scalable solution | + | * Reader/writer lock handling - they are not scalable on RT. Find a scalable solution - Replacement exists but might need to be revisited |
| - | * Hotplug interaction – find a proper solution able to be compatible with RT requirements | + | * 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 | + | * Timer interaction – rework the kernel architecture to be compatible with RT requirements - Partially solved, work in progress |
| + | * More palatable approach to RT friendly memory management - develop an upstream acceptable solution for the RT requirements - work in progress | ||
| + | Various details which do not fit into any of the above categories, but need to be addressed to make RT upstream acceptable | ||
| - | ===== Redesigning components & Documentation ===== | + | ===== Documentation ===== |
| - | * More palatable approach to RT friendly memory management - develop an upstream acceptable solution for the RT requirements | ||
| * Required to make mainline developers comfortable with it | * Required to make mainline developers comfortable with it | ||
| * Required for driver developers | * Required for driver developers | ||
| - | * Various details which do not fit into any of the above categories, but need to be addressed to make RT upstream acceptable | ||
| - | |||
| ---- | ---- | ||
| <WRAP rightalign>Go back to [[realtime:rtl:start|RTL Project Main Page]]</WRAP> | <WRAP rightalign>Go back to [[realtime:rtl:start|RTL Project Main Page]]</WRAP> | ||
realtime/rtl/all_topics.1486552469.txt.gz · Last modified: 2017/02/08 11:14 by anna-maria
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