1010a961fb
- Root cause: header-based class indexing (HEADER_CLASSIDX=1) wrote a 1-byte header during allocation, but linear carve/refill and initial slab capacity still used bare class block sizes. This mismatch could overrun slab usable space and corrupt freelists, causing reproducible SEGV at ~100k iters. Changes - Superslab: compute capacity with effective stride (block_size + header for classes 0..6; class7 remains headerless) in superslab_init_slab(). Add a debug-only bound check in superslab_alloc_from_slab() to fail fast if carve would exceed usable bytes. - Refill (non-P0 and P0): use header-aware stride for all linear carving and TLS window bump operations. Ensure alignment/validation in tiny_refill_opt.h also uses stride, not raw class size. - Drain: keep existing defense-in-depth for remote sentinel and sanitize nodes before splicing into freelist (already present). Notes - This unifies the memory layout across alloc/linear-carve/refill with a single stride definition and keeps class7 (1024B) headerless as designed. - Debug builds add fail-fast checks; release builds remain lean. Next - Re-run Tiny benches (256/1024B) in debug to confirm stability, then in release. If any remaining crash persists, bisect with HAKMEM_TINY_P0_BATCH_REFILL=0 to isolate P0 batch carve, and continue reducing branch-miss as planned.
32 lines
894 B
C
32 lines
894 B
C
#ifndef HAKMEM_POOL_TLS_ARENA_H
|
|
#define HAKMEM_POOL_TLS_ARENA_H
|
|
|
|
#include <stddef.h>
|
|
|
|
// Configuration
|
|
#define POOL_SIZE_CLASSES 7
|
|
extern int g_arena_max_growth_level; // 0..N (3 => 8MB cap)
|
|
extern size_t g_arena_initial_chunk_size; // bytes (default 1MB)
|
|
|
|
// TLS Arena Chunk
|
|
typedef struct {
|
|
void* chunk_base; // mmap base address (page-aligned)
|
|
size_t chunk_size; // Current chunk size (1/2/4/8 MB)
|
|
size_t offset; // Next carve offset
|
|
int growth_level; // 0=1MB, 1=2MB, 2=4MB, 3=8MB
|
|
} PoolChunk;
|
|
|
|
// API
|
|
// Carve 'count' blocks from TLS Arena for 'class_idx'
|
|
// Returns number of blocks carved (0 on OOM)
|
|
int arena_batch_carve(int class_idx, void** out_blocks, int count);
|
|
|
|
// Thread cleanup (munmap all chunks)
|
|
void arena_cleanup_thread(void);
|
|
|
|
#ifdef POOL_TLS_ARENA_DEBUG
|
|
void arena_print_stats(void);
|
|
#endif
|
|
|
|
#endif // HAKMEM_POOL_TLS_ARENA_H
|