2)因为buddy allocator每次分配必须是2order 个page同时分配,这样当实际需要内存大小小于2order 时,就会造成内存浪费,所以Linux为了解决buddy allocator造成的内部碎片问题,后面会引入slab分配器。 3.伙伴分配器的分配释放流程 伙伴分配器分配和释放物理页的数量单位为阶。分配n阶页块的过程如下: 1)查看是否有空闲的n阶页块,
unsigned long max_freeable; unsigned long node_allocs; unsigned long node_frees; unsigned long node_overflow; atomic_t allochit; atomic_t allocmiss; atomic_t freehit; atomic_t freemiss; /* * If debugging is enabled, then the allocator can add additional * fields and/or padding to every...
slitter是由 Backtrace Labs 团队设计实现并用于 C 后端服务器的 slab 分配器,采用 Rust 编写。 在实际生产的两个月中,该团队使用 slitter 来: 检测错误的分配类别 避免使用任何带内元数据(in-band metadata) 保证类型稳定分配 允许每个分配类指定如何映射它的备份内存 Slitter: a slab allocator that trusts, but...
* If debugging is enabled, then the allocator can add additional * fields and/or padding to every object. buffer_size contains the total * object size including these internal fields, the following two * variables contain the offset to the user object and its size. */ int obj_offset; int...
The three main structures that are used to manage caches in theSLAB allocatorare: struct kmem_cache(“/include/linux/slab_def.h”). struct kmem_cache_node(“/mm/slab.h”). struct array_cache(“/mm/slab.c”). I have already showed thatstruct kmem_cacheis exposed to the programmer in ...
// "linux/page_alloc.c" void free_pages(unsigned long addr, unsigned int order); 1. 2. 3. 4. 5. 6. 7. 8. 9. Both functions take the order as the parameter to see which queue to look for. If the queue is empty, the buddy allocator will search for queues in the bigger “or...
Slitter: a slab allocator that trusts, but verifies (in Rust, for C): https://engineering.backtrace.io/2021-08-04-slitter-a-slab-allocator-that-trusts-but-verifies/ GitHub: https:///backtrace-labs/slitter Crates.io: https://crates.io/crates/slitter ...
#3 0x00007f11c423268b in slab_allocator_free_chunk (chunk_size=chunk_size@entry=16, mem=mem@entry=0x7f11cd6202d0) at gslice.c:1321 #4 0x00007f11c4232946 in magazine_cache_push_magazine (allocator=0x7f11c4504260 <allocator>, stamp=<optimized out>, ix=<optimized out>) at gslice.c:...
The array of pages is positioned as an on-heap slab of at least 200 GB in a garbage collector managed area of a virtual machine memory.GREG LUCKCHRISTOPH ENGELBERT
* for the slab allocator to be able to lookup the cache and slab of a * virtual address for kfree, ksize, and slab debugging. */ static void slab_map_pages(struct kmem_cache *cache, struct slab *slab, struct page *page) static void slab_map_pages(struct kmem_cache *cache, struct ...