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mm: switch s_mem and slab_cache in struct page
This will allow us to store slub's counters in the same bits as slab's s_mem. slub now needs to set page->mapping to NULL as it frees the page, just like slab does. Link: http://lkml.kernel.org/r/20180518194519.3820-5-willy@infradead.org Signed-off-by: Matthew Wilcox <mawilcox@microsoft.com> Acked-by: Christoph Lameter <cl@linux.com> Acked-by: Vlastimil Babka <vbabka@suse.cz> Cc: Dave Hansen <dave.hansen@linux.intel.com> Cc: Jérôme Glisse <jglisse@redhat.com> Cc: "Kirill A . Shutemov" <kirill.shutemov@linux.intel.com> Cc: Lai Jiangshan <jiangshanlai@gmail.com> Cc: Martin Schwidefsky <schwidefsky@de.ibm.com> Cc: Pekka Enberg <penberg@kernel.org> Cc: Randy Dunlap <rdunlap@infradead.org> Cc: Andrey Ryabinin <aryabinin@virtuozzo.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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@ -83,7 +83,7 @@ struct page {
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/* See page-flags.h for the definition of PAGE_MAPPING_FLAGS */
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struct address_space *mapping;
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void *s_mem; /* slab first object */
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struct kmem_cache *slab_cache; /* SL[AU]B: Pointer to slab */
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atomic_t compound_mapcount; /* first tail page */
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/* page_deferred_list().next -- second tail page */
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};
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@ -194,7 +194,7 @@ struct page {
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spinlock_t ptl;
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#endif
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#endif
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struct kmem_cache *slab_cache; /* SL[AU]B: Pointer to slab */
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void *s_mem; /* slab first object */
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};
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#ifdef CONFIG_MEMCG
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