Re: [PATCH v3 0/7] prctl: introduce PR_SET/GET_THP_POLICY

* Usama Arif [off-list ref] [250519 18:34]:

This series allows to change the THP policy of a process, according to the
value set in arg2, all of which will be inherited during fork+exec:
- PR_DEFAULT_MADV_HUGEPAGE: This will set VM_HUGEPAGE and clear VM_NOHUGEPAGE
  for the default VMA flags. It will also iterate through every VMA in the
  process and call hugepage_madvise on it, with MADV_HUGEPAGE policy.
  This effectively allows setting MADV_HUGEPAGE on the entire process.
  In an environment where different types of workloads are run on the
  same machine, this will allow workloads that benefit from always having
  hugepages to do so, without regressing those that don't.
- PR_DEFAULT_MADV_NOHUGEPAGE: This will set VM_NOHUGEPAGE and clear VM_HUGEPAGE
  for the default VMA flags. It will also iterate through every VMA in the
  process and call hugepage_madvise on it, with MADV_NOHUGEPAGE policy.
  This effectively allows setting MADV_NOHUGEPAGE on the entire process.
  In an environment where different types of workloads are run on the
  same machine,this will allow workloads that benefit from having
  hugepages on an madvise basis only to do so, without regressing those
  that benefit from having hugepages always.
- PR_THP_POLICY_SYSTEM: This will reset (clear) both VM_HUGEPAGE and
  VM_NOHUGEPAGE process for the default flags.

Subject seems outdated now?  PR_DEFAULT_ vs PR_SET/GET_THP ?

On that note, doesn't it make sense to change the default mm flag under
PR_SET_MM?  PR_SET_MM_FLAG maybe?

Thanks,
Liam