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Subject[06/14] vcompound: Virtual fallback for sparsemem
Sparsemem currently attempts to do a physically contiguous mapping
and then falls back to vmalloc. The same thing can now be accomplished
using virtual compound pages.

Cc: apw@shadowen.org
Signed-off-by: Christoph Lameter <clameter@sgi.com>
---
mm/sparse.c | 25 ++-----------------------
1 file changed, 2 insertions(+), 23 deletions(-)

Index: linux-2.6.25-rc5-mm1/mm/sparse.c
===================================================================
--- linux-2.6.25-rc5-mm1.orig/mm/sparse.c 2008-03-20 18:04:45.345133447 -0700
+++ linux-2.6.25-rc5-mm1/mm/sparse.c 2008-03-20 19:32:53.361317058 -0700
@@ -327,24 +327,7 @@ static void __kfree_section_memmap(struc
#else
static struct page *__kmalloc_section_memmap(unsigned long nr_pages)
{
- struct page *page, *ret;
- unsigned long memmap_size = sizeof(struct page) * nr_pages;
-
- page = alloc_pages(GFP_KERNEL|__GFP_NOWARN, get_order(memmap_size));
- if (page)
- goto got_map_page;
-
- ret = vmalloc(memmap_size);
- if (ret)
- goto got_map_ptr;
-
- return NULL;
-got_map_page:
- ret = (struct page *)pfn_to_kaddr(page_to_pfn(page));
-got_map_ptr:
- memset(ret, 0, memmap_size);
-
- return ret;
+ return __alloc_vcompound(GFP_KERNEL, get_order(memmap_size)));
}

static inline struct page *kmalloc_section_memmap(unsigned long pnum, int nid,
@@ -355,11 +338,7 @@ static inline struct page *kmalloc_secti

static void __kfree_section_memmap(struct page *memmap, unsigned long nr_pages)
{
- if (is_vmalloc_addr(memmap))
- vfree(memmap);
- else
- free_pages((unsigned long)memmap,
- get_order(sizeof(struct page) * nr_pages));
+ __free_vcompound(memmap);
}
#endif /* CONFIG_SPARSEMEM_VMEMMAP */

--


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