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slub: Do not use frozen page flag but a bit in the page counters

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Do not use a page flag for the frozen bit. It needs to be part
of the state that is handled with cmpxchg_double(). So use a bit
in the counter struct in the page struct for that purpose.

Signed-off-by: Christoph Lameter <cl@linux.com>
Signed-off-by: Pekka Enberg <penberg@kernel.org>
This commit is contained in:
Christoph Lameter 2011-06-01 12:25:45 -05:00 committed by Pekka Enberg
parent 7e0528dadc
commit 50d5c41cd1
3 changed files with 9 additions and 13 deletions
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5
include/linux/mm_types.h
View File

@ -41,8 +41,9 @@ struct page {
* & limit reverse map searches. * & limit reverse map searches.
*/ */
struct { /* SLUB */ struct { /* SLUB */
u16 inuse; unsigned inuse:16;
u16 objects; unsigned objects:15;
unsigned frozen:1;
}; };
}; };
union { union {

5
include/linux/page-flags.h
View File

@ -124,9 +124,6 @@ enum pageflags {
/* SLOB */ /* SLOB */
PG_slob_free = PG_private, PG_slob_free = PG_private,
/* SLUB */
PG_slub_frozen = PG_active,
}; };
#ifndef __GENERATING_BOUNDS_H #ifndef __GENERATING_BOUNDS_H
@ -212,8 +209,6 @@ PAGEFLAG(SwapBacked, swapbacked) __CLEARPAGEFLAG(SwapBacked, swapbacked)
__PAGEFLAG(SlobFree, slob_free) __PAGEFLAG(SlobFree, slob_free)
__PAGEFLAG(SlubFrozen, slub_frozen)
/* /*
* Private page markings that may be used by the filesystem that owns the page * Private page markings that may be used by the filesystem that owns the page
* for its own purposes. * for its own purposes.

12
mm/slub.c
View File

@ -166,7 +166,7 @@ static inline int kmem_cache_debug(struct kmem_cache *s)
#define OO_SHIFT 16 #define OO_SHIFT 16
#define OO_MASK ((1 << OO_SHIFT) - 1) #define OO_MASK ((1 << OO_SHIFT) - 1)
#define MAX_OBJS_PER_PAGE 65535 /* since page.objects is u16 */ #define MAX_OBJS_PER_PAGE 32767 /* since page.objects is u15 */
/* Internal SLUB flags */ /* Internal SLUB flags */
#define __OBJECT_POISON 0x80000000UL /* Poison object */ #define __OBJECT_POISON 0x80000000UL /* Poison object */
@ -1025,7 +1025,7 @@ static noinline int free_debug_processing(struct kmem_cache *s,
} }
/* Special debug activities for freeing objects */ /* Special debug activities for freeing objects */
if (!PageSlubFrozen(page) && !page->freelist) if (!page->frozen && !page->freelist)
remove_full(s, page); remove_full(s, page);
if (s->flags & SLAB_STORE_USER) if (s->flags & SLAB_STORE_USER)
set_track(s, object, TRACK_FREE, addr); set_track(s, object, TRACK_FREE, addr);
@ -1424,7 +1424,7 @@ static inline int lock_and_freeze_slab(struct kmem_cache_node *n,
{ {
if (slab_trylock(page)) { if (slab_trylock(page)) {
__remove_partial(n, page); __remove_partial(n, page);
__SetPageSlubFrozen(page); page->frozen = 1;
return 1; return 1;
} }
return 0; return 0;
@ -1538,7 +1538,7 @@ static void unfreeze_slab(struct kmem_cache *s, struct page *page, int tail)
{ {
struct kmem_cache_node *n = get_node(s, page_to_nid(page)); struct kmem_cache_node *n = get_node(s, page_to_nid(page));
__ClearPageSlubFrozen(page); page->frozen = 0;
if (page->inuse) { if (page->inuse) {
if (page->freelist) { if (page->freelist) {
@ -1868,7 +1868,7 @@ static void *__slab_alloc(struct kmem_cache *s, gfp_t gfpflags, int node,
flush_slab(s, c); flush_slab(s, c);
slab_lock(page); slab_lock(page);
__SetPageSlubFrozen(page); page->frozen = 1;
c->node = page_to_nid(page); c->node = page_to_nid(page);
c->page = page; c->page = page;
goto load_freelist; goto load_freelist;
@ -2048,7 +2048,7 @@ static void __slab_free(struct kmem_cache *s, struct page *page,
page->freelist = object; page->freelist = object;
page->inuse--; page->inuse--;
if (unlikely(PageSlubFrozen(page))) { if (unlikely(page->frozen)) {
stat(s, FREE_FROZEN); stat(s, FREE_FROZEN);
goto out_unlock; goto out_unlock;
} }