This book mainly introduces two aspects: 1. How to save system memory; 2. How to speed up the process. \"Embedded Linux Memory Usage and Performance Optimization\" mainly talks about two difficulties in embedded system development: system memory usage and system performance optimization. Regarding the system memory usage, \"Embedded Linux Memory Usage and Performance Optimization\" attempts to complete two tasks: increase the amount of free memory of the system as a whole, thereby improving the concurrency of the process; enable the system to maintain a high amount of free memory after a long period of operation. The memory usage described in \"Embedded Linux Memory Usage and Performance Optimization\" is not the memory management of the Linux kernel, but observes how the process uses memory at the user level. Regarding system performance optimization, \"Embedded Linux Memory Usage and Performance Optimization\" is different from similar books that focus on programming syntax or the practice of leveraging hardware performance. Instead, it focuses on the performance optimization practice of large software projects, clarifies the dialectical relationship between logic optimization and code optimization, and proposes the concept of software optimization level. For code optimization, it explains the realm of code optimization and points out the research direction for code optimization.
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