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Philipp Oppermann
2020-01-15 17:17:27 +01:00
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blog/content/second-edition/posts/11-allocator-designs/index.md
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@@ -1126,8 +1126,25 @@ many_boxes... [ok]
many_boxes_long_lived... [ok] many_boxes_long_lived... [ok]
``` ```
Our new allocator seems to work!
### Discussion ### Discussion
While the fixed-size block approach has a much better performance than the linked list approach, it wastes up to half of the memory when using powers of 2 as block sizes. Whether this tradeoff is worth it heavily depends on the application type. For an operating system kernel
+ Better performance
- Memory waste
+ Only half of memory in worst case, quarter of memory in average case
+ Fallback allocator makes implementation simple
- Performance not fully predictable
+ Fixed-block approach used in Redox
- Implementation only permits power-of-2 block sizes
#### Variations
- Buddy allocator
- Slab allocator
## Summary ## Summary
## What's next? ## What's next?