|struct rte_memzone * ||rte_memzone_reserve (const char *name, size_t len, int socket_id, unsigned flags)|
|struct rte_memzone * ||rte_memzone_reserve_aligned (const char *name, size_t len, int socket_id, unsigned flags, unsigned align)|
|struct rte_memzone * ||rte_memzone_reserve_bounded (const char *name, size_t len, int socket_id, unsigned flags, unsigned align, unsigned bound)|
|int ||rte_memzone_free (const struct rte_memzone *mz)|
|struct rte_memzone * ||rte_memzone_lookup (const char *name)|
|void ||rte_memzone_dump (FILE *f)|
|void ||rte_memzone_walk (void(*func)(const struct rte_memzone *, void *arg), void *arg)|
The goal of the memzone allocator is to reserve contiguous portions of physical memory. These zones are identified by a name.
The memzone descriptors are shared by all partitions and are located in a known place of physical memory. This zone is accessed using rte_eal_get_configuration(). The lookup (by name) of a memory zone can be done in any partition and returns the same physical address.
A reserved memory zone cannot be unreserved. The reservation shall be done at initialization time only.
Definition in file rte_memzone.h.
|struct rte_memzone* rte_memzone_reserve_bounded
||const char *
Reserve a portion of physical memory with specified alignment and boundary.
This function reserves some memory with specified alignment and boundary, and returns a pointer to a correctly filled memzone descriptor. If the allocation cannot be done or if the alignment or boundary are not a power of 2, returns NULL. Memory buffer is reserved in a way, that it wouldn't cross specified boundary. That implies that requested length should be less or equal then boundary.
- Reserving memzones with len set to 0 will only attempt to allocate memzones from memory that is already available. It will not trigger any new allocations.
: When reserving memzones with len set to 0, it is preferable to also set a valid socket_id. Setting socket_id to SOCKET_ID_ANY is supported, but will likely not yield expected results. Specifically, the resulting memzone may not necessarily be the biggest memzone available, but rather biggest memzone available on socket id corresponding to an lcore from which reservation was called.
|name||The name of the memzone. If it already exists, the function will fail and return NULL. |
|len||The size of the memory to be reserved. If it is 0, the biggest contiguous zone will be reserved. |
|socket_id||The socket identifier in the case of NUMA. The value can be SOCKET_ID_ANY if there is no NUMA constraint for the reserved zone. |
|flags||The flags parameter is used to request memzones to be taken from specifically sized hugepages.|
- RTE_MEMZONE_2MB - Reserved from 2MB pages
- RTE_MEMZONE_1GB - Reserved from 1GB pages
- RTE_MEMZONE_16MB - Reserved from 16MB pages
- RTE_MEMZONE_16GB - Reserved from 16GB pages
- RTE_MEMZONE_256KB - Reserved from 256KB pages
- RTE_MEMZONE_256MB - Reserved from 256MB pages
- RTE_MEMZONE_512MB - Reserved from 512MB pages
- RTE_MEMZONE_4GB - Reserved from 4GB pages
- RTE_MEMZONE_SIZE_HINT_ONLY - Allow alternative page size to be used if the requested page size is unavailable. If this flag is not set, the function will return error on an unavailable size request.
- RTE_MEMZONE_IOVA_CONTIG - Ensure reserved memzone is IOVA-contiguous. This option should be used when allocating memory intended for hardware rings etc.
|align||Alignment for resulting memzone. Must be a power of 2. |
|bound||Boundary for resulting memzone. Must be a power of 2 or zero. Zero value implies no boundary condition. |
- A pointer to a correctly-filled read-only memzone descriptor, or NULL on error. On error case, rte_errno will be set appropriately:
- E_RTE_NO_CONFIG - function could not get pointer to rte_config structure
- E_RTE_SECONDARY - function was called from a secondary process instance
- ENOSPC - the maximum number of memzones has already been allocated
- EEXIST - a memzone with the same name already exists
- ENOMEM - no appropriate memory area found in which to create memzone
- EINVAL - invalid parameters