11.4. Parameters for reserving HugeTLB pages at run time

nr_hugepages

Defines the number of huge pages of a specified size assigned to a specified NUMA node.

/sys/devices/system/node/node_id/hugepages/hugepages-size/nr_hugepages

nr_overcommit_hugepages

Defines the maximum number of additional huge pages that can be created and used by the system through overcommitting memory.

Writing any non-zero value into this file indicates that the system obtains that number of huge pages from the kernel’s normal page pool if the persistent huge page pool is exhausted. As these surplus huge pages become unused, they are then freed and returned to the kernel’s normal page pool.

/proc/sys/vm/nr_overcommit_hugepages