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Commit 8cb38fab authored by Kirill A. Shutemov's avatar Kirill A. Shutemov Committed by Linus Torvalds
Browse files

page-flags: define behavior of LRU-related flags on compound pages 



Only head pages are ever on LRU.  Let's use PF_HEAD policy to avoid any
confusion for all LRU-related flags.

Signed-off-by: default avatarKirill A. Shutemov <kirill.shutemov@linux.intel.com>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: Hugh Dickins <hughd@google.com>
Cc: Dave Hansen <dave.hansen@intel.com>
Cc: Mel Gorman <mgorman@suse.de>
Cc: Rik van Riel <riel@redhat.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Cc: Christoph Lameter <cl@linux.com>
Cc: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
Cc: Steve Capper <steve.capper@linaro.org>
Cc: "Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Michal Hocko <mhocko@suse.cz>
Cc: Jerome Marchand <jmarchan@redhat.com>
Cc: Jérôme Glisse <jglisse@redhat.com>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent df8c94d1

include/linux/page-flags.h

+9 −8
Original line number Diff line number Diff line
@@ -258,13 +258,14 @@ static inline int __TestClearPage##uname(struct page *page) { return 0; } 


__PAGEFLAG(Locked, locked, PF_NO_TAIL)

PAGEFLAG(Error, error, PF_NO_COMPOUND) TESTCLEARFLAG(Error, error, PF_NO_COMPOUND)

PAGEFLAG(Referenced, referenced, PF_ANY) TESTCLEARFLAG(Referenced, referenced, PF_ANY)

	__SETPAGEFLAG(Referenced, referenced, PF_ANY)

PAGEFLAG(Referenced, referenced, PF_HEAD)

	TESTCLEARFLAG(Referenced, referenced, PF_HEAD)

	__SETPAGEFLAG(Referenced, referenced, PF_HEAD)

PAGEFLAG(Dirty, dirty, PF_HEAD) TESTSCFLAG(Dirty, dirty, PF_HEAD)

	__CLEARPAGEFLAG(Dirty, dirty, PF_HEAD)

PAGEFLAG(LRU, lru, PF_ANY) __CLEARPAGEFLAG(LRU, lru, PF_ANY)

PAGEFLAG(Active, active, PF_ANY) __CLEARPAGEFLAG(Active, active, PF_ANY)

	TESTCLEARFLAG(Active, active, PF_ANY)

PAGEFLAG(LRU, lru, PF_HEAD) __CLEARPAGEFLAG(LRU, lru, PF_HEAD)

PAGEFLAG(Active, active, PF_HEAD) __CLEARPAGEFLAG(Active, active, PF_HEAD)

	TESTCLEARFLAG(Active, active, PF_HEAD)

__PAGEFLAG(Slab, slab, PF_ANY)

PAGEFLAG(Checked, checked, PF_NO_COMPOUND)	   /* Used by some filesystems */

PAGEFLAG(Pinned, pinned, PF_ANY) TESTSCFLAG(Pinned, pinned, PF_ANY)	/* Xen */
@@ -318,9 +319,9 @@ PAGEFLAG(SwapCache, swapcache, PF_ANY) 
PAGEFLAG_FALSE(SwapCache)

#endif



PAGEFLAG(Unevictable, unevictable, PF_ANY)

	__CLEARPAGEFLAG(Unevictable, unevictable, PF_ANY)

	TESTCLEARFLAG(Unevictable, unevictable, PF_ANY)

PAGEFLAG(Unevictable, unevictable, PF_HEAD)

	__CLEARPAGEFLAG(Unevictable, unevictable, PF_HEAD)

	TESTCLEARFLAG(Unevictable, unevictable, PF_HEAD)



#ifdef CONFIG_MMU

PAGEFLAG(Mlocked, mlocked, PF_ANY) __CLEARPAGEFLAG(Mlocked, mlocked, PF_ANY)