numa
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What happens if numa=off is provided in kernel parameter?
If “numa=off” is in kernel boot parameter, it will mark ‘numa_off’ global variable which will be checked during initialization function which is ‘x86_numa_init()’ in x86_64. This will make it not call ‘numa_init’ if numa_off is 1. static __init int numa_setup(char *opt) { if (!opt) return -EINVAL; if (!strncmp(opt, “off”, 3)) numa_off = 1; #ifdef CONFIG_NUMA_EMU… Continue reading
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Personal memo for ‘Automatic NUMA Balancing’
Automatic NUMA Balancing It is described in Documentation/sysctl/kernel.txt numa_balancing Enables/disables automatic page fault based NUMA memory balancing. Memory is moved automatically to nodes that access it often. Enables/disables automatic NUMA memory balancing. On NUMA machines, there is a performance penalty if remote memory is accessed by a CPU. When this feature is enabled the kernel… Continue reading
About Me
A software engineer who loves any technologies that makes life easier. That’s why I love Linux and Mac at the same time.
Recent Posts
- How to find the actual memory usage by each process
- How to check memory usage in Linux – part 1.2 – Per-process level memory usage check
- How to check memory usage in Linux – part 1.1 – System level memory usage check
- How to check memory usage in Linux – part 1. User space
- How to track SLAB usage using slub_debug=U
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