The patch titled
Subject: mm: introduce _slub_counter_t
has been added to the -mm tree. Its filename is
mm-introduce-_slub_counter_t.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/mm-introduce-_slub_counter_t.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/mm-introduce-_slub_counter_t.patch
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The -mm tree is included into linux-next and is updated
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------------------------------------------------------
From: Matthew Wilcox <mawilcox@xxxxxxxxxxxxx>
Subject: mm: introduce _slub_counter_t
Instead of putting the ifdef in the middle of the definition of struct
page, pull it forward to the rest of the ifdeffery around the SLUB
cmpxchg_double optimisation.
Link: http://lkml.kernel.org/r/20171220155552.15884-6-willy@xxxxxxxxxxxxx
Signed-off-by: Matthew Wilcox <mawilcox@xxxxxxxxxxxxx>
Acked-by: Kirill A. Shutemov <kirill.shutemov@xxxxxxxxxxxxxxx>
Acked-by: Michal Hocko <mhocko@xxxxxxxx>
Cc: Christoph Lameter <cl@xxxxxxxxx>
Cc: Randy Dunlap <rdunlap@xxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
include/linux/mm_types.h | 21 ++++++++-------------
1 file changed, 8 insertions(+), 13 deletions(-)
diff -puN include/linux/mm_types.h~mm-introduce-_slub_counter_t include/linux/mm_types.h
--- a/include/linux/mm_types.h~mm-introduce-_slub_counter_t
+++ a/include/linux/mm_types.h
@@ -41,9 +41,15 @@ struct hmm;
*/
#ifdef CONFIG_HAVE_ALIGNED_STRUCT_PAGE
#define _struct_page_alignment __aligned(2 * sizeof(unsigned long))
+#if defined(CONFIG_HAVE_CMPXCHG_DOUBLE)
+#define _slub_counter_t unsigned long
#else
-#define _struct_page_alignment
+#define _slub_counter_t unsigned int
#endif
+#else /* !CONFIG_HAVE_ALIGNED_STRUCT_PAGE */
+#define _struct_page_alignment
+#define _slub_counter_t unsigned int
+#endif /* !CONFIG_HAVE_ALIGNED_STRUCT_PAGE */
struct page {
/* First double word block */
@@ -66,18 +72,7 @@ struct page {
};
union {
-#if defined(CONFIG_HAVE_CMPXCHG_DOUBLE) && \
- defined(CONFIG_HAVE_ALIGNED_STRUCT_PAGE)
- /* Used for cmpxchg_double in slub */
- unsigned long counters;
-#else
- /*
- * Keep _refcount separate from slub cmpxchg_double data.
- * As the rest of the double word is protected by slab_lock
- * but _refcount is not.
- */
- unsigned counters;
-#endif
+ _slub_counter_t counters;
unsigned int active; /* SLAB */
struct { /* SLUB */
unsigned inuse:16;
_
Patches currently in -mm which might be from mawilcox@xxxxxxxxxxxxx are
provide-useful-debugging-information-for-vm_bug.patch
mm-align-struct-page-more-aesthetically.patch
mm-de-indent-struct-page.patch
mm-remove-misleading-alignment-claims.patch
mm-improve-comment-on-page-mapping.patch
mm-introduce-_slub_counter_t.patch
mm-store-compound_dtor-compound_order-as-bytes.patch
mm-document-how-to-use-struct-page.patch
mm-remove-reference-to-pg_buddy.patch
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