Fixes suggested by Andrew
---
include/linux/slab.h | 12 ++++++++++++
mm/slub.c | 32 +++++++++++++++++++++-----------
2 files changed, 33 insertions(+), 11 deletions(-)
Index: slub/mm/slub.c
===================================================================
--- slub.orig/mm/slub.c 2007-05-04 15:52:54.000000000 -0700
+++ slub/mm/slub.c 2007-05-04 15:53:11.000000000 -0700
@@ -2142,42 +2142,46 @@ EXPORT_SYMBOL(kfree);
*
* Return error code or number of remaining objects
*/
-static int __kmem_cache_vacate(struct kmem_cache *s, struct page *page)
+static int __kmem_cache_vacate(struct kmem_cache *s,
+ struct page *page, unsigned long flags)
{
void *p;
void *addr = page_address(page);
- unsigned long map[BITS_TO_LONGS(s->objects)];
+ DECLARE_BITMAP(map, s->objects);
int leftover;
if (!page->inuse)
return 0;
/* Determine free objects */
- bitmap_zero(map, s->objects);
- for(p = page->freelist; p; p = get_freepointer(s, p))
- set_bit((p - addr) / s->size, map);
+ bitmap_fill(map, s->objects);
+ for (p = page->freelist; p; p = get_freepointer(s, p))
+ __clear_bit((p - addr) / s->size, map);
/*
* Get a refcount for all used objects. If that fails then
* no KICK callback can be performed.
*/
- for(p = addr; p < addr + s->objects * s->size; p += s->size)
- if (!test_bit((p - addr) / s->size, map))
+ for (p = addr; p < addr + s->objects * s->size; p += s->size)
+ if (test_bit((p - addr) / s->size, map))
if (!s->slab_ops->get_reference(p))
- set_bit((p - addr) / s->size, map);
+ __clear_bit((p - addr) / s->size, map);
/* Got all the references we need. Now we can drop the slab lock */
slab_unlock(page);
+ local_irq_restore(flags);
/* Perform the KICK callbacks to remove the objects */
for(p = addr; p < addr + s->objects * s->size; p += s->size)
- if (!test_bit((p - addr) / s->size, map))
+ if (test_bit((p - addr) / s->size, map))
s->slab_ops->kick_object(p);
+ local_irq_save(flags);
slab_lock(page);
leftover = page->inuse;
ClearPageActive(page);
putback_slab(s, page);
+ local_irq_restore(flags);
return leftover;
}
@@ -2197,6 +2201,7 @@ static void remove_from_lists(struct kme
*/
int kmem_cache_vacate(struct page *page)
{
+ unsigned long flags;
struct kmem_cache *s;
int rc = 0;
@@ -2208,6 +2213,7 @@ int kmem_cache_vacate(struct page *page)
if (!PageSlab(page))
goto out;
+ local_irq_save(flags);
slab_lock(page);
/*
@@ -2221,6 +2227,7 @@ int kmem_cache_vacate(struct page *page)
*/
if (!PageSlab(page) || PageActive(page) || !page->inuse) {
slab_unlock(page);
+ local_irq_restore(flags);
goto out;
}
@@ -2231,7 +2238,7 @@ int kmem_cache_vacate(struct page *page)
s = page->slab;
remove_from_lists(s, page);
SetPageActive(page);
- rc = __kmem_cache_vacate(s, page) == 0;
+ rc = __kmem_cache_vacate(s, page, flags) == 0;
out:
put_page(page);
return rc;
@@ -2336,8 +2343,11 @@ int kmem_cache_shrink(struct kmem_cache
/* Now we can free objects in the slabs on the zaplist */
list_for_each_entry_safe(page, page2, &zaplist, lru) {
+ unsigned long flags;
+
+ local_irq_save(flags);
slab_lock(page);
- __kmem_cache_vacate(s, page);
+ __kmem_cache_vacate(s, page, flags);
}
}
Index: slub/include/linux/slab.h
===================================================================
--- slub.orig/include/linux/slab.h 2007-05-04 15:53:06.000000000 -0700
+++ slub/include/linux/slab.h 2007-05-04 15:53:17.000000000 -0700
@@ -42,7 +42,19 @@ struct slab_ops {
void (*ctor)(void *, struct kmem_cache *, unsigned long);
/* FIXME: Remove all destructors ? */
void (*dtor)(void *, struct kmem_cache *, unsigned long);
+ /*
+ * Called with slab lock held and interrupts disabled.
+ * No slab operations may be performed in get_reference
+ *
+ * Must return 1 if a reference was obtained.
+ * 0 if we failed to obtain the reference (f.e.
+ * the object is concurrently freed).
+ */
int (*get_reference)(void *);
+ /*
+ * Called with no locks held and interrupts enabled.
+ * Any operation may be performed in kick_object.
+ */
void (*kick_object)(void *);
};
-
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