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As some comments point out that this code might not be production ready, can anyone recommend other solutions that are able to manage a given block of memory? M

As some comments point out that this code might not be production ready, can anyone recommend other solutions that are able to manage a given block of memory? My understanding of libraries like jemalloc is that they are replacing malloc (using system calls brk and mmap [0]) but I can't hand it an already allocated block of memory to manage, right? Something like memory_manager m(some_buffer); allocation a = m.allocate(512); would be nice. :-) [0] https://medium.com/iskakaushik/eli5-jemalloc-e9bd412abd70 https://medium.com/iskakaushik/eli5-jemalloc-e9bd412abd70

lfy_google 8y ago
https://android.googlesource.com/platform/external/qemu/+/emu-master-dev/android/android-emu/android/base/SubAllocator.h https://android.googlesource.com/platform/external/qemu/+/em... https://android.googlesource.com/platform/external/qemu/+/emu-master-dev/android/android-emu/android/base/SubAllocator.cpp https://android.googlesource.com/platform/external/qemu/+/em... https://android.googlesource.com/platform/external/qemu/+/emu-master-dev/android/android-emu/android/base/address_space.h https://android.googlesource.com/platform/external/qemu/+/em... These 3 files should be a fairly self contained, minimal way to allocate into existing buffers. No attempt is made at thread safety though (we assume the user synchronizes that themselves)
ksherlock 8y ago
SQLite memory system 5: https://www.sqlite.org/src/artifact/9bf955937b07f8c3 https://www.sqlite.org/src/artifact/9bf955937b07f8c3
dividuum 8y ago
This TLSF implementation should be able to do that: https://github.com/mattconte/tlsf https://github.com/mattconte/tlsf
nuclx 8y ago
FreeRTOS features sone nice and simple allocators on fixed buffers [0]. I have used heap4 to implement memory management for a fully portable test suite requiring malloc. Really any toy allocator would have done the job for that use-case, since performance wasn't critical, but heap4 was fairly easy to integrate. [0] https://www.freertos.org/a00111.html https://www.freertos.org/a00111.html
davidtgoldblatt 8y ago
Depending on what exactly you mean by "hand it a block of memory to manage", you can do this with jemalloc's extent hook functionality. Though that's meant for "I have some long-lived data structures, I want all their memory stored on hugepages" more than "I have this small-ish data structure, I want to batch its allocations together".

lfy_google 8y ago

https://android.googlesource.com/platform/external/qemu/+/emu-master-dev/android/android-emu/android/base/SubAllocator.h https://android.googlesource.com/platform/external/qemu/+/em... https://android.googlesource.com/platform/external/qemu/+/emu-master-dev/android/android-emu/android/base/SubAllocator.cpp https://android.googlesource.com/platform/external/qemu/+/em... https://android.googlesource.com/platform/external/qemu/+/emu-master-dev/android/android-emu/android/base/address_space.h https://android.googlesource.com/platform/external/qemu/+/em... These 3 files should be a fairly self contained, minimal way to allocate into existing buffers. No attempt is made at thread safety though (we assume the user synchronizes that themselves)

ksherlock 8y ago

SQLite memory system 5: https://www.sqlite.org/src/artifact/9bf955937b07f8c3 https://www.sqlite.org/src/artifact/9bf955937b07f8c3

dividuum 8y ago

This TLSF implementation should be able to do that: https://github.com/mattconte/tlsf https://github.com/mattconte/tlsf

nuclx 8y ago

FreeRTOS features sone nice and simple allocators on fixed buffers [0]. I have used heap4 to implement memory management for a fully portable test suite requiring malloc. Really any toy allocator would have done the job for that use-case, since performance wasn't critical, but heap4 was fairly easy to integrate. [0] https://www.freertos.org/a00111.html https://www.freertos.org/a00111.html

davidtgoldblatt 8y ago

Depending on what exactly you mean by "hand it a block of memory to manage", you can do this with jemalloc's extent hook functionality. Though that's meant for "I have some long-lived data structures, I want all their memory stored on hugepages" more than "I have this small-ish data structure, I want to batch its allocations together".