How much memory could vm use

From the Linux kernel documentation: max_map_count: This file contains the maximum number of memory map areas a process may have. Memory map areas are used as a side-effect of calling malloc, directly by mmap and mprotect, and also when loading shared libraries. While most applications need less than a thousand maps, certain programs, particularly malloc … Read more

How can Docker run distros with different kernels?

Docker never uses a different kernel: the kernel is always your host kernel. If your host kernel is “compatible enough” with the software in the container you want to run it will work; otherwise, it won’t. “Containers” Are Just Process Configuration The key thing to understand is that a Docker container is not a virtual … Read more

Image vs zImage vs uImage

What is the difference between them? Image: the generic Linux kernel binary image file. zImage: a compressed version of the Linux kernel image that is self-extracting. uImage: an image file that has a U-Boot wrapper (installed by the mkimage utility) that includes the OS type and loader information. A very common practice (e.g. the typical … Read more

What is the difference between the kernel space and the user space?

The really simplified answer is that the kernel runs in kernel space, and normal programs run in user space. User space is basically a form of sand-boxing — it restricts user programs so they can’t mess with memory (and other resources) owned by other programs or by the OS kernel. This limits (but usually doesn’t … Read more

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