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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>
hifive-unleashed-5.1
Matthew Wilcox 2018-06-07 17:08:26 -07:00 committed by Linus Torvalds
parent 1d40a5ea01
commit d4fc5069a3
2 changed files with 3 additions and 2 deletions
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4
include/linux/mm_types.h
View File

@ -83,7 +83,7 @@ struct page {
/* See page-flags.h for the definition of PAGE_MAPPING_FLAGS */
struct address_space *mapping;
void *s_mem; /* slab first object */
struct kmem_cache *slab_cache; /* SL[AU]B: Pointer to slab */
atomic_t compound_mapcount; /* first tail page */
/* page_deferred_list().next -- second tail page */
};
@ -194,7 +194,7 @@ struct page {
spinlock_t ptl;
#endif
#endif
struct kmem_cache *slab_cache; /* SL[AU]B: Pointer to slab */
void *s_mem; /* slab first object */
};
#ifdef CONFIG_MEMCG

1
mm/slub.c
View File

@ -1695,6 +1695,7 @@ static void __free_slab(struct kmem_cache *s, struct page *page)
__ClearPageSlab(page);
page_mapcount_reset(page);
page->mapping = NULL;
if (current->reclaim_state)
current->reclaim_state->reclaimed_slab += pages;
memcg_uncharge_slab(page, order, s);