[LibOS] Add support for `getcpu` syscall

Open vijaydhanraj opened this issue 3 years ago • 2 comments

Description of the changes

This PR was dependent on sysfs rewrite. Now that it is done, reviving this PR.

This commit adds an approx. implementation of getcpu syscall that returns a random set bit from cpu affinity mask associated with calling thread and its corresponding NUMA node.

pthread_set_get_affinity regression test is extended to validate this implementation. This commit also enables the getcpu01 ltp test for non-SGX case.

Closes https://github.com/gramineproject/graphene/pull/2331