Optimising ID Allocation for low-memory devices

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Matthew Wilcox

https://2019.linux.conf.au/schedule/presentation/126/

The Linux kernel needs to allocate small identifying numbers for many things (e.g. file descriptors, process IDs, SCSI devices, USB ports, network devices). The implementation of this crucial functionality was surprisingly memory-hungry and so it needed to be rewritten.

This case study shows
– How implementing functionality in the Linux kernel (or any project of sufficient
complexity) requires being aware of…


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