feat: slab allocator for fixed-size kernel objects#166
Merged
Conversation
…binfo Add bitmap-based slab allocator (SlabCache) with SlabBox<T> smart pointer for O(1) allocation/deallocation of frequently used fixed-size objects. Two slab caches serve the heaviest allocation paths in fork/exec: - fd_table: 64 slots x 12288 bytes for FdTable arrays - signal_handlers: 64 slots x 2048 bytes for SignalAction arrays SlabBox<T> transparently falls back to the global heap when slabs are full, so the system degrades gracefully under load rather than failing. Also adds /proc/slabinfo virtual file accessible via `cat /proc/slabinfo` from userspace, showing live slab utilization stats. This required adding the ProcfsFile fd type with open/read/close/fstat/poll support across both x86_64 and ARM64 syscall paths. Includes boot POST and memory integration tests for slab initialization. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
1 participant
Add this suggestion to a batch that can be applied as a single commit.This suggestion is invalid because no changes were made to the code.Suggestions cannot be applied while the pull request is closed.Suggestions cannot be applied while viewing a subset of changes.Only one suggestion per line can be applied in a batch.Add this suggestion to a batch that can be applied as a single commit.Applying suggestions on deleted lines is not supported.You must change the existing code in this line in order to create a valid suggestion.Outdated suggestions cannot be applied.This suggestion has been applied or marked resolved.Suggestions cannot be applied from pending reviews.Suggestions cannot be applied on multi-line comments.Suggestions cannot be applied while the pull request is queued to merge.Suggestion cannot be applied right now. Please check back later.
Summary
SlabCache+SlabBox<T>) for O(1) alloc/dealloc of fixed-size kernel objectsfd_table(64 slots x 12 KiB) andsignal_handlers(64 slots x 2 KiB), targeting the heaviest fork/exec allocation paths/proc/slabinfovirtual file withProcfsFilefd type, readable viacat /proc/slabinfofrom userspace shellTest plan
cat /proc/slabinfoworks from breenix shellcargo test -- memory_testspasses (slab init + procfs init tests)cargo test -- boot_post_testpasses (slab allocator POST check)🤖 Generated with Claude Code