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SLUB: introduce DebugSlab(page) 

This replaces the PageError() checking.  DebugSlab is clearer and allows for
future changes to the page bit used.  We also need it to support
CONFIG_SLUB_DEBUG.

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 2007-05-09 02:32:42 -07:00 committed by Linus Torvalds
parent b345970905
commit 35e5d7ee27
1 changed files with 28 additions and 12 deletions
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40
mm/slub.c
View File

@ -87,6 +87,21 @@
* the fast path.
*/
static inline int SlabDebug(struct page *page)
{
return PageError(page);
}
static inline void SetSlabDebug(struct page *page)
{
SetPageError(page);
}
static inline void ClearSlabDebug(struct page *page)
{
ClearPageError(page);
}
/*
* Issues still to be resolved:
*
@ -823,7 +838,7 @@ static struct page *allocate_slab(struct kmem_cache *s, gfp_t flags, int node)
static void setup_object(struct kmem_cache *s, struct page *page,
void *object)
{
if (PageError(page)) {
if (SlabDebug(page)) {
init_object(s, object, 0);
init_tracking(s, object);
}
@ -858,7 +873,7 @@ static struct page *new_slab(struct kmem_cache *s, gfp_t flags, int node)
page->flags |= 1 << PG_slab;
if (s->flags & (SLAB_DEBUG_FREE | SLAB_RED_ZONE | SLAB_POISON |
SLAB_STORE_USER | SLAB_TRACE))
page->flags |= 1 << PG_error;
SetSlabDebug(page);
start = page_address(page);
end = start + s->objects * s->size;
@ -887,7 +902,7 @@ static void __free_slab(struct kmem_cache *s, struct page *page)
{
int pages = 1 << s->order;
if (unlikely(PageError(page) || s->dtor)) {
if (unlikely(SlabDebug(page) || s->dtor)) {
void *p;
slab_pad_check(s, page);
@ -934,7 +949,8 @@ static void discard_slab(struct kmem_cache *s, struct page *page)
atomic_long_dec(&n->nr_slabs);
reset_page_mapcount(page);
page->flags &= ~(1 << PG_slab | 1 << PG_error);
ClearSlabDebug(page);
__ClearPageSlab(page);
free_slab(s, page);
}
@ -1109,7 +1125,7 @@ static void putback_slab(struct kmem_cache *s, struct page *page)
if (page->freelist)
add_partial(n, page);
else if (PageError(page) && (s->flags & SLAB_STORE_USER))
else if (SlabDebug(page) && (s->flags & SLAB_STORE_USER))
add_full(n, page);
slab_unlock(page);
@ -1193,7 +1209,7 @@ static void flush_all(struct kmem_cache *s)
* per cpu array in the kmem_cache struct.
*
* Fastpath is not possible if we need to get a new slab or have
* debugging enabled (which means all slabs are marked with PageError)
* debugging enabled (which means all slabs are marked with SlabDebug)
*/
static void *slab_alloc(struct kmem_cache *s,
gfp_t gfpflags, int node, void *addr)
@ -1216,7 +1232,7 @@ redo:
object = page->freelist;
if (unlikely(!object))
goto another_slab;
if (unlikely(PageError(page)))
if (unlikely(SlabDebug(page)))
goto debug;
have_object:
@ -1314,7 +1330,7 @@ static void slab_free(struct kmem_cache *s, struct page *page,
local_irq_save(flags);
slab_lock(page);
if (unlikely(PageError(page)))
if (unlikely(SlabDebug(page)))
goto debug;
checks_ok:
prior = object[page->offset] = page->freelist;
@ -2571,12 +2587,12 @@ static void validate_slab_slab(struct kmem_cache *s, struct page *page)
s->name, page);
if (s->flags & DEBUG_DEFAULT_FLAGS) {
if (!PageError(page))
printk(KERN_ERR "SLUB %s: PageError not set "
if (!SlabDebug(page))
printk(KERN_ERR "SLUB %s: SlabDebug not set "
"on slab 0x%p\n", s->name, page);
} else {
if (PageError(page))
printk(KERN_ERR "SLUB %s: PageError set on "
if (SlabDebug(page))
printk(KERN_ERR "SLUB %s: SlabDebug set on "
"slab 0x%p\n", s->name, page);
}
}