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Optimising ID Allocation for low-memory devices
--client
lca
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lca2019
--room c3 14545 --force
Next: 13 Improving Graphics Interactivity - It's All in the Timing.
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Marks
Author(s):
Matthew Wilcox
Location
C3
Date
jan Wed 23
Days Raw Files
Start
16:45
First Raw Start
16:36
Duration
0:45:0
Offset
0:08:20
End
17:30
Last Raw End
17:23
Chapters
00:00
0:21:43
Total cuts_time
34 min.
https://2019.linux.conf.au/schedule/presentation/126/
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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 implementation details of other parts of the project. - The perils of half-complete migrations. - How easy it is to overlook hundreds of kilobytes of memory leaking when you have gigabytes of memory in your system. - The importance of API design.
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