Difference between revisions of "Real-time Linux on RISC-V"
From iis-projects
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Currently, mainline Linux is not suitable for real-time workloads which require a deterministic and predictable behavior. Many design decision rather focus on throughput. There have been various approaches trying to address problem such as RTLinux[4], Xenomai[5] and PREEMPT_RT [2]. This work will focus on PREEMPT_RT. | Currently, mainline Linux is not suitable for real-time workloads which require a deterministic and predictable behavior. Many design decision rather focus on throughput. There have been various approaches trying to address problem such as RTLinux[4], Xenomai[5] and PREEMPT_RT [2]. This work will focus on PREEMPT_RT. | ||
| − | PREEMPT_RT is a set of patches for Linux to turn into a kernel that is more suitable for real-time applications. These changes try to ''minimize the amount of kernel code that is non-preemptible'' which translates directly into a more reactive system. | + | PREEMPT_RT is a set of patches for Linux to turn into a kernel that is more suitable for real-time applications. These changes try to ''minimize the amount of kernel code that is non-preemptible'' which translates directly into a more reactive system. The core algorithms and data structures that are changed are the timer, interrupt handlers, RCU, mutexes and spinlocks[3][6]. |
| − | + | As a development platform we will use Cheshire[7], an open-source SoC from our group that features a 64-bit RISC-V core and various peripherals such as UART, SPI, I2C, VGA and more. | |
| − | Cheshire | ||
= Project = | = Project = | ||
| − | The goal of this project is to port PREEMPT_RT Linux to run on 64-bit RISC-V Linux. | + | The goal of this project is to port PREEMPT_RT Linux to run on 64-bit RISC-V Linux, evaluate performance compare to baseline Linux and propose modifications. As development environment you will run Cheshire on a FPGA. |
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| + | * Port PREEMPT_RT Linux to Cheshire | ||
| + | * Evaluate Performance compare to other configuration such as baseline Linux, Sel4 and Hypervisor configurations (Bao[8], Sel4 VMM[9]). You can start from e.g. just running cyclitest[10]. | ||
| + | * Propose modifications to Hardware and Software. This will depend on the scope of the thesis (SA or MA). | ||
== Character == | == Character == | ||
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[4] https://www.yodaiken.com/papers/rtlmanifesto.pdf | [4] https://www.yodaiken.com/papers/rtlmanifesto.pdf | ||
[5] https://source.denx.de/Xenomai/xenomai/-/wikis/home | [5] https://source.denx.de/Xenomai/xenomai/-/wikis/home | ||
| + | [6] https://wiki.linuxfoundation.org/realtime/documentation/technical_details/start | ||
| + | [7] https://github.com/pulp-platform/cheshire | ||
| + | [8] https://github.com/bao-project/bao-hypervisor | ||
| + | [9] https://sel4.systems/ | ||
| + | [10] https://wiki.linuxfoundation.org/realtime/documentation/howto/tools/cyclictest/start | ||
Revision as of 18:17, 7 July 2023
Contents
Overview
Status: Available
- Type: Semester Thesis or Master Thesis
- Professor: Prof. Dr. L. Benini
- Supervisors:
Introduction
Linux[1] is a monolithic, modular, Unix-like, open-source general-purpose kernel running on servers, workstations, mobile devices and embedded systems.
Currently, mainline Linux is not suitable for real-time workloads which require a deterministic and predictable behavior. Many design decision rather focus on throughput. There have been various approaches trying to address problem such as RTLinux[4], Xenomai[5] and PREEMPT_RT [2]. This work will focus on PREEMPT_RT.
PREEMPT_RT is a set of patches for Linux to turn into a kernel that is more suitable for real-time applications. These changes try to minimize the amount of kernel code that is non-preemptible which translates directly into a more reactive system. The core algorithms and data structures that are changed are the timer, interrupt handlers, RCU, mutexes and spinlocks[3][6].
As a development platform we will use Cheshire[7], an open-source SoC from our group that features a 64-bit RISC-V core and various peripherals such as UART, SPI, I2C, VGA and more.
Project
The goal of this project is to port PREEMPT_RT Linux to run on 64-bit RISC-V Linux, evaluate performance compare to baseline Linux and propose modifications. As development environment you will run Cheshire on a FPGA.
- Port PREEMPT_RT Linux to Cheshire
- Evaluate Performance compare to other configuration such as baseline Linux, Sel4 and Hypervisor configurations (Bao[8], Sel4 VMM[9]). You can start from e.g. just running cyclitest[10].
- Propose modifications to Hardware and Software. This will depend on the scope of the thesis (SA or MA).
Character
- 15% Literature / architecture review
- 65% C programming
- 20% Evaluation
Prerequisites
- Experience with digital design in SystemVerilog as taught in VLSI I
- Basic knowledge of operating systems
- Knowledge of C programming language and UNIX tooling as from previous bachelor/master courses
References
[1] https://www.kernel.org/ [2] https://wiki.linuxfoundation.org/realtime/start [3] https://lwn.net/Articles/146861/ [4] https://www.yodaiken.com/papers/rtlmanifesto.pdf [5] https://source.denx.de/Xenomai/xenomai/-/wikis/home [6] https://wiki.linuxfoundation.org/realtime/documentation/technical_details/start [7] https://github.com/pulp-platform/cheshire [8] https://github.com/bao-project/bao-hypervisor [9] https://sel4.systems/ [10] https://wiki.linuxfoundation.org/realtime/documentation/howto/tools/cyclictest/start
