The patch titled
Subject: page-flags: add documentation for policies
has been added to the -mm tree. Its filename is
page-flags-introduce-page-flags-policies-wrt-compound-pages-fix-fix.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/page-flags-introduce-page-flags-policies-wrt-compound-pages-fix-fix.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/page-flags-introduce-page-flags-policies-wrt-compound-pages-fix-fix.patch
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------------------------------------------------------
From: "Kirill A. Shutemov" <kirill.shutemov@xxxxxxxxxxxxxxx>
Subject: page-flags: add documentation for policies
The patch adds description for page flags policies.
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@xxxxxxxxxxxxxxx>
Cc: Andrea Arcangeli <aarcange@xxxxxxxxxx>
Cc: Hugh Dickins <hughd@xxxxxxxxxx>
Cc: Christoph Lameter <cl@xxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
include/linux/page-flags.h | 18 +++++++++++++++++-
1 file changed, 17 insertions(+), 1 deletion(-)
diff -puN include/linux/page-flags.h~page-flags-introduce-page-flags-policies-wrt-compound-pages-fix-fix include/linux/page-flags.h
--- a/include/linux/page-flags.h~page-flags-introduce-page-flags-policies-wrt-compound-pages-fix-fix
+++ a/include/linux/page-flags.h
@@ -154,7 +154,23 @@ static inline int PageCompound(struct pa
return test_bit(PG_head, &page->flags) || PageTail(page);
}
-/* Page flags policies wrt compound pages */
+/*
+ * Page flags policies wrt compound pages
+ *
+ * PF_ANY:
+ * the page flag is relevant for small, head and tail pages.
+ *
+ * PF_HEAD:
+ * for compound page all operations related to the page flag applied to
+ * head page.
+ *
+ * PF_NO_TAIL:
+ * modifications of the page flag must be done on small or head pages,
+ * checks can be done on tail pages too.
+ *
+ * PF_NO_COMPOUND:
+ * the page flag is not relevant for compound pages.
+ */
#define PF_ANY(page, enforce) page
#define PF_HEAD(page, enforce) compound_head(page)
#define PF_NO_TAIL(page, enforce) ({ \
_
Patches currently in -mm which might be from kirill.shutemov@xxxxxxxxxxxxxxx are
rcu-force-alignment-on-struct-callback_head-rcu_head.patch
mm-make-optimistic-check-for-swapin-readahead-fix.patch
mm-make-swapin-readahead-to-improve-thp-collapse-rate-fix.patch
mm-make-swapin-readahead-to-improve-thp-collapse-rate-fix-2.patch
mm-make-swapin-readahead-to-improve-thp-collapse-rate-fix-3.patch
mm-drop-page-slab_page.patch
slab-slub-use-page-rcu_head-instead-of-page-lru-plus-cast.patch
zsmalloc-use-page-private-instead-of-page-first_page.patch
mm-pack-compound_dtor-and-compound_order-into-one-word-in-struct-page.patch
mm-make-compound_head-robust.patch
mm-make-compound_head-robust-fix.patch
mm-use-unsigned-int-for-page-order.patch
mm-use-unsigned-int-for-compound_dtor-compound_order-on-64bit.patch
page-flags-trivial-cleanup-for-pagetrans-helpers.patch
page-flags-move-code-around.patch
page-flags-introduce-page-flags-policies-wrt-compound-pages.patch
page-flags-introduce-page-flags-policies-wrt-compound-pages-fix.patch
page-flags-introduce-page-flags-policies-wrt-compound-pages-fix-fix.patch
page-flags-define-pg_locked-behavior-on-compound-pages.patch
page-flags-define-behavior-of-fs-io-related-flags-on-compound-pages.patch
page-flags-define-behavior-of-lru-related-flags-on-compound-pages.patch
page-flags-define-behavior-slb-related-flags-on-compound-pages.patch
page-flags-define-behavior-of-xen-related-flags-on-compound-pages.patch
page-flags-define-pg_reserved-behavior-on-compound-pages.patch
page-flags-define-pg_swapbacked-behavior-on-compound-pages.patch
page-flags-define-pg_swapcache-behavior-on-compound-pages.patch
page-flags-define-pg_mlocked-behavior-on-compound-pages.patch
page-flags-define-pg_uncached-behavior-on-compound-pages.patch
page-flags-define-pg_uptodate-behavior-on-compound-pages.patch
page-flags-look-at-head-page-if-the-flag-is-encoded-in-page-mapping.patch
mm-sanitize-page-mapping-for-tail-pages.patch
mm-support-madvisemadv_free-fix-3.patch
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