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 <[email protected]>
---
include/linux/mm.h | 4 ----
include/linux/mm_types.h | 9 ++-------
mm/slub.c | 2 --
3 files changed, 2 insertions(+), 13 deletions(-)
Index: linux-2.6.22-rc6-mm1/include/linux/mm.h
===================================================================
--- linux-2.6.22-rc6-mm1.orig/include/linux/mm.h 2007-07-05 19:05:02.000000000 -0700
+++ linux-2.6.22-rc6-mm1/include/linux/mm.h 2007-07-05 19:05:24.000000000 -0700
@@ -632,10 +632,6 @@ static inline struct address_space *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;
Index: linux-2.6.22-rc6-mm1/include/linux/mm_types.h
===================================================================
--- linux-2.6.22-rc6-mm1.orig/include/linux/mm_types.h 2007-07-05 19:00:19.000000000 -0700
+++ linux-2.6.22-rc6-mm1/include/linux/mm_types.h 2007-07-05 19:05:24.000000000 -0700
@@ -49,13 +49,8 @@ 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. */
Index: linux-2.6.22-rc6-mm1/mm/slub.c
===================================================================
--- linux-2.6.22-rc6-mm1.orig/mm/slub.c 2007-07-05 19:05:16.000000000 -0700
+++ linux-2.6.22-rc6-mm1/mm/slub.c 2007-07-05 19:05:24.000000000 -0700
@@ -1109,7 +1109,6 @@ static struct page *new_slab(struct kmem
atomic_long_inc(&n->nr_slabs);
page->inuse = 0;
- page->lockless_freelist = NULL;
page->offset = s->offset / sizeof(void *);
page->slab = s;
@@ -1163,7 +1162,6 @@ static void __free_slab(struct kmem_cach
NR_SLAB_RECLAIMABLE : NR_SLAB_UNRECLAIMABLE,
- pages);
- page->mapping = NULL;
__free_pages(page, s->order);
}
--
-
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