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mm: prepare page_referenced() and page_idle to new THP refcounting

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Both page_referenced() and page_idle_clear_pte_refs_one() assume that
THP can only be mapped with PMD, so there's no reason to look on PTEs
for PageTransHuge() pages.  That's no true anymore: THP can be mapped
with PTEs too.

The patch removes PageTransHuge() test from the functions and opencode
page table check.

[akpm@linux-foundation.org: coding-style fixes]
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Cc: Vladimir Davydov <vdavydov@parallels.com>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: Hugh Dickins <hughd@google.com>
Cc: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
Cc: Sasha Levin <sasha.levin@oracle.com>
Cc: Minchan Kim <minchan@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Kirill A. Shutemov
2016-01-15 16:54:37 -08:00
committed by Linus Torvalds
parent e90309c9f7
commit b20ce5e03b
6 changed files with 188 additions and 115 deletions
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23
include/linux/mm.h
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@@ -433,21 +433,26 @@ static inline void page_mapcount_reset(struct page *page)
atomic_set(&(page)->_mapcount, -1);
}
int __page_mapcount(struct page *page);
static inline int page_mapcount(struct page *page)
{
int ret;
VM_BUG_ON_PAGE(PageSlab(page), page);
ret = atomic_read(&page->_mapcount) + 1;
if (PageCompound(page)) {
page = compound_head(page);
ret += atomic_read(compound_mapcount_ptr(page)) + 1;
if (PageDoubleMap(page))
ret--;
}
return ret;
if (unlikely(PageCompound(page)))
return __page_mapcount(page);
return atomic_read(&page->_mapcount) + 1;
}
#ifdef CONFIG_TRANSPARENT_HUGEPAGE
int total_mapcount(struct page *page);
#else
static inline int total_mapcount(struct page *page)
{
return page_mapcount(page);
}
#endif
static inline int page_count(struct page *page)
{
return atomic_read(&compound_head(page)->_count);