On 01/16, Alex Thorlton wrote:
>
> static inline int khugepaged_test_exit(struct mm_struct *mm)
> {
> - return atomic_read(&mm->mm_users) == 0;
> + return atomic_read(&mm->mm_users) == 0 ||
> + (mm->flags & MMF_THP_DISABLE_MASK);
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
test_bit(MMF_THP_DISABLE) ?
And I am not sure this and another check in transparent_hugepage_enabled
is actually right...
I think that MMF_THP_DISABLE_MASK should not disable thp if this
vma has VM_HUGEPAGE set, iow perhaps madvise() should work even
after PR_SET_THP_DISABLE?
IOW, MMF_THP_DISABLE should act as khugepaged_req_madv().
But again, I won't argue.
Oleg.
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