Arm Architecture: Cache [Author's Direct Lecture Part 3-4]

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1. 30% discount coupon issued when 300 people sign up

To celebrate reaching 300 students (Part 1 and 2), we are issuing a 30% discount coupon. Thank you. It is for the first 200 people.

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2. Roadmap Guide 🎯

This lecture is a roadmap 'Arm - advanced course for system software developers ' This lecture is included in .

If you want to learn Arm architecture (Armv8-A, Armv7-A) systematically , it is recommended to use the roadmap ( 30% discount on all lectures ). For reference, the Arm architecture roadmap (all author lectures) is Basic Course and Advanced Course It consists of two parts.

In the latest system software
The most important Arm architecture

The Arm processors used in smartphones, AI SoC system semiconductors, electric vehicles (autonomous driving, infotainment), cloud servers, and MacBooks are all Armv8-A based 64-bit Cortex-A processors (Cortex-A53, Cortex-A57, Cortex-A72, etc.). The Armv8-A architecture can be seen as the most needed basic knowledge in the current system software industry.

The first step to becoming an advanced system SW developer!
Understanding how cache works 🙋‍♂

However, in order to become an advanced system software developer, you need to have a good understanding of how to manage memory, which is one of the main functions that make up the Arm architecture. The core of how to manage memory is the 'virtual memory system', ' cache operation principles ', and 'memory model and barrier'.

So why do we need to know ‘how cache works’?

1⃣ First, in the memory hierarchy, the cache is located between the CPU core and the main memory. Since the cache can have a significant impact on the performance of the system , the basic structure of the cache, the structure of the multi-level cache, and the cache lookup are basic knowledge for improving the performance of the system.

2⃣ Second, if you know the structure of the cache well, you can write cache-friendly code that takes advantage of cache hits . For example, frequently used routines can be designed to run only on specific CPU cores. As a result, cache misses can be reduced, allowing you to program for optimized performance.

3⃣ Third, the operating principle of the cache is the basic knowledge that can be used to debug crash issues well . When working on a real project, the cache may be broken or an error may occur in the 'Cache Line Fill' operation. The basic knowledge that can be used to debug such cache-related issues well is the structure and operation of the cache.

4⃣ Fourth, if you know a lot about cache, you can do well in technical interviews. In particular, questions about cache are asked a lot in technical interviews at fabless companies (system semiconductors).

Learn about these things

It explains the basic concepts of cache in an easy and detailed manner and introduces the structure of CPU cache.

We explain multi-level caches applied in most CPUs and analyze the flow of cache processing in the memory system in a big picture.

Describes the components of the cache in detail and explains cache information (cache lines and additional information) with the TRACE32 debugging program.

Provides an easy-to-understand and detailed explanation of the cache policies (write-back, write-through) applied to multi-level caches.

Introduces cache-related terminology used in the Arm architecture and explains how cache-related APIs are used in real-world projects.

Based on my experience writing books and giving lectures
More in-depth and detailed than anyone else!

The author of the unprecedented 'Arm Architecture (Armv8-A, Armv7-A)' and 'Linux Kernel' books in the domestic system software field. He is also a working developer who knows the latest system software trends (electric vehicles, system semiconductors - system software) the best, and an educator who is most active in spreading knowledge in the system software field.

• Author of 'Structure and Principles of Arm Architecture for System Software Development' ( 2024, Korean Academy of Sciences Outstanding Book Award )

• Author of 'Learning the Structure and Principles of the Linux Kernel through Debugging' ( 2021, Korean Academy of Sciences Outstanding Book Award )

• 'Programmers Dev Course: Linux System and Kernel Expert' Main Instructor

• June 2022, Korea Computer Conference (KCC2022) - Tutorial presentation [Conquering the Linux Kernel using ftrace]

• LG Electronics 'Linux Kernel' and 'Armv8 Architecture' In-house Instructor ( including domestic and overseas developers ) - (2020~2024)

I can confidently say that I am the educator who can explain the key features of the Arm architecture (Armv8-A, Armv7-A) better than anyone else in Korea.

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<Structure and Principles of Arm Architecture for System Software Development - Part 1/2 Author's Lecture>

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