* ggml : add `alloc_buffer_n` to buffer type interface
Add alloc_buffer_n method to ggml_backend_buffer_type_i
interface, with a public API ggml_backend_buft_alloc_buffer_n.
- Default implementation in ggml-backend.cpp handles multi-buffer
splitting and tensor allocation via ggml_tallocr
- Meta buffer type provides custom implementation that creates
per-device sub-contexts and delegates to simple buffer types
- ggml_backend_alloc_ctx_tensors_from_buft now collects tensors
into a list and delegates to the new API
- Remove temporary ggml_backend_meta_alloc_ctx_tensors_from_buft
- Add NULL alloc_buffer_n to all existing buffer type
interfaces (cpu, metal, openvino, hexagon, webgpu, zdnn, virtgpu, repack)
Assisted-by: llama.cpp:local pi
* cont : fix `cur_buf_size` init after flushing a buffer
* ggml : add TODO tag for shared buffer split logic
Assisted-by: pi:llama.cpp/DeepSeek-V4-Flash-Vision-Exp
* tests : add alloc_buffer_n coverage
Assisted-by: pi:llama.cpp/DeepSeek-V4-Flash-Vision-Exp
* cont : fix compile warnings
* tests : add descriptions for alloc_buffer_n tests
Assisted-by: pi:llama.cpp/Qwen3.8-27B
* ggml : address review comments on alloc_buffer_n
- restore GGML_LOG_ERROR on buffer alloc / tensor init failure in the
default impl (name the failing tensor)
- check the malloc result and drop the _impl indirection in
ggml_backend_alloc_ctx_tensors_from_buft
- remove comments that restate the code
- fix the TAG_ALLOC_SHARED_BUFFER_SPLIT typo
Assisted-by: pi:llama.cpp/Qwen3.8-27B
* ggml : add get_alloc_size_n to buffer type interface
- Add ggml_backend_buft_get_alloc_size_n public API
- Add optional get_alloc_size_n callback to ggml_backend_buffer_type_i
- Share tensor->buffer planning between alloc_buffer_n default and get_alloc_size_n default
- Replace unchecked realloc with std::vector in alloc_buffer_n default
- Make ggml_backend_alloc_ctx_tensors_from_buft_size use the new API
- Add test-alloc coverage for get_alloc_size_n
Assisted-by: pi:llama.cpp/DeepSeek-V4-Flash-Vision-Exp
* cont : report malloc failure
* tests: Harmonize the use of private ggml includes
* tests: In test-backend-ops, use quoted includes
As with all other tests. This is to ensure that the build uses shipped
headers over possibly system-installed ones.
* ggml : make gallocr respect the backend's max buffer size
* if the graph requires more memory than can fit into a single allocation, split it into multiple backend buffers
* vulkan: report the actual max allocation size in buffer type interface
* fix missing newline, apple-clang warning
* track size of individual chunks in ggml_dyn_tallocr and raise max chunks.
revert to use suballocation_block_size as max chunk size for vulkan.
* track (chunk, offset) pairs instead of "global" offsets through gallocr.
* simpler, don't need loops to map between local/global offsets
* touches more code
* fix dyn_tallocr_max_size and initialization
* fix memory leak when buffers are reused due to same buffer type appearing multiple times
* make vbuffer allocation follow the same logic as backend_buffer did before
* continue to use leftover unallocated space of previous chunks after a new one has been created
* treat free blocks of each chunk as separate list
* they're still allocated together, but start/end of each chunk is tracked, and allocate/free iterate over sub-ranges
* exhaust freed blocks of all chunks before considering their last blocks with unallocated space
* start with 0 chunks/blocks and create chunks as needed
* allow the last chunk to grow beyond max size
* refactor: move adding new free block and new chunk into separate functions
* allocate chunks individually with a separate free-blocks list for each one
* needs a bit more memory/allocations/indirections, but code is simpler
* fix warnings (missing static) & debug checks
Georgi Gerganov