[PATCH] slab: removes local_irq_save()/local_irq_restore() pair
Proposed by and based on a patch from Eric Dumazet <dada1@cosmosbay.com>:
This patch removes unnecessary critical section in ksize() function, as
cli/sti are rather expensive on modern CPUS.
It additionally adds a docbook entry for ksize() and further simplifies the
code.
Signed-Off-By: Manfred Spraul <manfred@colorfullife.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
diff --git a/mm/slab.c b/mm/slab.c
index 75127a6..a9ff4f7 100644
--- a/mm/slab.c
+++ b/mm/slab.c
@@ -3076,20 +3076,24 @@
}
#endif
+/**
+ * ksize - get the actual amount of memory allocated for a given object
+ * @objp: Pointer to the object
+ *
+ * kmalloc may internally round up allocations and return more memory
+ * than requested. ksize() can be used to determine the actual amount of
+ * memory allocated. The caller may use this additional memory, even though
+ * a smaller amount of memory was initially specified with the kmalloc call.
+ * The caller must guarantee that objp points to a valid object previously
+ * allocated with either kmalloc() or kmem_cache_alloc(). The object
+ * must not be freed during the duration of the call.
+ */
unsigned int ksize(const void *objp)
{
- kmem_cache_t *c;
- unsigned long flags;
- unsigned int size = 0;
+ if (unlikely(objp == NULL))
+ return 0;
- if (likely(objp != NULL)) {
- local_irq_save(flags);
- c = GET_PAGE_CACHE(virt_to_page(objp));
- size = kmem_cache_size(c);
- local_irq_restore(flags);
- }
-
- return size;
+ return obj_reallen(GET_PAGE_CACHE(virt_to_page(objp)));
}