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mm:add KPF_ZERO_PAGE flag for /proc/kpageflags

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Add KPF_ZERO_PAGE flag for zero_page, so that userspace processes can
detect zero_page in /proc/kpageflags, and then do memory analysis more
accurately.

Signed-off-by: Yalin Wang <yalin.wang@sonymobile.com>
Acked-by: Kirill A. Shutemov <kirill@shutemov.name>
Cc: Konstantin Khlebnikov <koct9i@gmail.com>
Cc: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Wang, Yalin
2015-02-11 15:24:51 -08:00
committed by Linus Torvalds
parent 1d148e218a
commit 56873f43ab
6 changed files with 36 additions and 9 deletions
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7
mm/huge_memory.c
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@@ -171,12 +171,7 @@ static int start_khugepaged(void)
}
static atomic_t huge_zero_refcount;
static struct page *huge_zero_page __read_mostly;
static inline bool is_huge_zero_page(struct page *page)
{
return ACCESS_ONCE(huge_zero_page) == page;
}
struct page *huge_zero_page __read_mostly;
static inline bool is_huge_zero_pmd(pmd_t pmd)
{