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SLUB: Do not use page->mapping

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After moving the lockless_freelist to kmem_cache_cpu we no longer need
page->lockless_freelist. Restructure the use of the struct page fields in
such a way that we never touch the mapping field.

This is turn allows us to remove the special casing of SLUB when determining
the mapping of a page (needed for corner cases of virtual caches machines that
need to flush caches of processors mapping a page).

Signed-off-by: Christoph Lameter <clameter@sgi.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Christoph Lameter 2007-10-16 01:26:06 -07:00 committed by Linus Torvalds
parent dfb4f09609
commit 8e65d24c7c
3 changed files with 2 additions and 13 deletions
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4
include/linux/mm.h
View file

@ -568,10 +568,6 @@ static inline struct address_space *page_mapping(struct page *page)
VM_BUG_ON(PageSlab(page));
if (unlikely(PageSwapCache(page)))
mapping = &swapper_space;
#ifdef CONFIG_SLUB
else if (unlikely(PageSlab(page)))
mapping = NULL;
#endif
else if (unlikely((unsigned long)mapping & PAGE_MAPPING_ANON))
mapping = NULL;
return mapping;

9
include/linux/mm_types.h
View file

@ -62,13 +62,8 @@ struct page {
#if NR_CPUS >= CONFIG_SPLIT_PTLOCK_CPUS
spinlock_t ptl;
#endif
struct { /* SLUB uses */
void **lockless_freelist;
struct kmem_cache *slab; /* Pointer to slab */
};
struct {
struct page *first_page; /* Compound pages */
};
struct kmem_cache *slab; /* SLUB: Pointer to slab */
struct page *first_page; /* Compound tail pages */
};
union {
pgoff_t index; /* Our offset within mapping. */

2
mm/slub.c
View file

@ -1127,7 +1127,6 @@ static struct page *new_slab(struct kmem_cache *s, gfp_t flags, int node)
set_freepointer(s, last, NULL);
page->freelist = start;
page->lockless_freelist = NULL;
page->inuse = 0;
out:
if (flags & __GFP_WAIT)
@ -1153,7 +1152,6 @@ static void __free_slab(struct kmem_cache *s, struct page *page)
NR_SLAB_RECLAIMABLE : NR_SLAB_UNRECLAIMABLE,
- pages);
page->mapping = NULL;
__free_pages(page, s->order);
}