How to control NUMA node placement for SGX enclave memory allocation Body

[haru864]

I am running an SGX application on a NUMA system and would like to know how enclave memory is allocated with respect to NUMA nodes.

I use sgx_create_enclave() to initialize the enclave. When observing memory usage before and after the application using numastat, I noticed the following:

• local_node memory usage increases,
• other_node memory usage remains unchanged.

Based on this, I assume that SGX enclave memory is allocated only from the NUMA node local to the CPU executing the application.

Questions:

Is this assumption correct?

Is it possible to allocate enclave memory on a remote NUMA node (not the one local to the current CPU)?

Below is the numastat output before and after the SGX application runs:

Before:
                           node0           node1
numa_hit               348313797       250010472
numa_miss                      0               0
numa_foreign                   0               0
interleave_hit            137318          136998
local_node             348272630       249705279
other_node                 41167          305193

After:
                           node0           node1
numa_hit               348325444       250013526
numa_miss                      0               0
numa_foreign                   0               0
interleave_hit            137318          136998
local_node             348284277       249708333
other_node                 41167          305193