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mm: introduce do_set_pmd()

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With postponed page table allocation we have chance to setup huge pages.
do_set_pte() calls do_set_pmd() if following criteria met:

 - page is compound;
 - pmd entry in pmd_none();
 - vma has suitable size and alignment;

Link: http://lkml.kernel.org/r/1466021202-61880-12-git-send-email-kirill.shutemov@linux.intel.com
Signed-off-by: Kirill A. Shutemov <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Kirill A. Shutemov 2016-07-26 15:25:29 -07:00 • committed by Linus Torvalds
commit 1010245964
4 changed files with 74 additions and 8 deletions
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3
mm/migrate.c
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@ -1986,8 +1986,7 @@ fail_putback:
}
orig_entry = *pmd;
entry = mk_pmd(new_page, vma->vm_page_prot);
entry = pmd_mkhuge(entry);
entry = mk_huge_pmd(new_page, vma->vm_page_prot);
entry = maybe_pmd_mkwrite(pmd_mkdirty(entry), vma);
/*