Samuel Thibault
2008-Feb-13 13:55 UTC
[Xen-devel] [PATCH] Mini-OS: Fix alignment in maybe_split()
Mini-OS: Fix alignment in maybe_split()
Needed on ia-64, speeds up on x86.
Signed-off-by: Samuel Thibault <samuel.thibault@eu.citrix.com>
diff -r e85399173769 extras/mini-os/lib/xmalloc.c
--- a/extras/mini-os/lib/xmalloc.c Tue Feb 12 16:59:08 2008 +0000
+++ b/extras/mini-os/lib/xmalloc.c Wed Feb 13 13:53:57 2008 +0000
@@ -62,10 +62,19 @@ struct xmalloc_pad
size_t hdr_size;
};
+/* Return size, increased to alignment with align. */
+static inline size_t align_up(size_t size, size_t align)
+{
+ return (size + align - 1) & ~(align - 1);
+}
+
static void maybe_split(struct xmalloc_hdr *hdr, size_t size, size_t block)
{
struct xmalloc_hdr *extra;
- size_t leftover = block - size;
+ size_t leftover;
+ size = align_up(size, __alignof__(struct xmalloc_hdr));
+ size = align_up(size, __alignof__(struct xmalloc_pad));
+ leftover = block - size;
/* If enough is left to make a block, put it on free list. */
if ( leftover >= (2 * (sizeof(struct xmalloc_hdr) + sizeof(struct
xmalloc_pad))) )
@@ -98,12 +107,6 @@ static struct xmalloc_hdr *xmalloc_new_p
maybe_split(hdr, size, PAGE_SIZE);
return hdr;
-}
-
-/* Return size, increased to alignment with align. */
-static inline size_t align_up(size_t size, size_t align)
-{
- return (size + align - 1) & ~(align - 1);
}
/* Big object? Just use the page allocator. */
_______________________________________________
Xen-devel mailing list
Xen-devel@lists.xensource.com
http://lists.xensource.com/xen-devel