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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.

[[email protected]: coding-style fixes]
Signed-off-by: Kirill A. Shutemov <[email protected]>
Cc: Vladimir Davydov <[email protected]>
Cc: Andrea Arcangeli <[email protected]>
Cc: Hugh Dickins <[email protected]>
Cc: Naoya Horiguchi <[email protected]>
Cc: Sasha Levin <[email protected]>
Cc: Minchan Kim <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Kirill A. Shutemov 2016-01-15 16:54:37 -08:00 • committed by Linus Torvalds
commit b20ce5e03b
6 changed files with 185 additions and 112 deletions
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14
mm/util.c
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@ -407,6 +407,20 @@ struct address_space *page_mapping(struct page *page)
return mapping;
}
/* Slow path of page_mapcount() for compound pages */
int __page_mapcount(struct page *page)
{
int ret;
ret = atomic_read(&page->_mapcount) + 1;
page = compound_head(page);
ret += atomic_read(compound_mapcount_ptr(page)) + 1;
if (PageDoubleMap(page))
ret--;
return ret;
}
EXPORT_SYMBOL_GPL(__page_mapcount);
int overcommit_ratio_handler(struct ctl_table *table, int write,
void __user *buffer, size_t *lenp,
loff_t *ppos)