Refactor contigmalloc() into two functions: a simple front-end that deals

with the malloc tag and calls a new back-end, kmem_alloc_contig(), that
allocates the pages and maps them.

The motivations for this change are two-fold: (1) A cache mode parameter
will be added to kmem_alloc_contig().  In other words, kmem_alloc_contig()
will be extended to support the allocation of memory with caller-specified
caching. (2) The UMA allocation function that is used by the two jumbo
frames zones can use kmem_alloc_contig() in place of contigmalloc() and
thereby avoid having free jumbo frames held by the zone counted as live
malloc()ed memory.

1 files changed, 3 insertions, 0 deletions

diff --git a/sys/vm/vm_extern.h b/sys/vm/vm_extern.h
index 475a20e..efd363a 100644
--- a/sys/vm/vm_extern.h
+++ b/sys/vm/vm_extern.h
@@ -44,6 +44,9 @@ struct vnode;
 
 int kernacc(void *, int, int);
 vm_offset_t kmem_alloc(vm_map_t, vm_size_t);
+vm_offset_t kmem_alloc_contig(vm_map_t map, vm_size_t size, int flags,
+    vm_paddr_t low, vm_paddr_t high, unsigned long alignment,
+    unsigned long boundary);
 vm_offset_t kmem_alloc_nofault(vm_map_t, vm_size_t);
 vm_offset_t kmem_alloc_wait(vm_map_t, vm_size_t);
 void kmem_free(vm_map_t, vm_offset_t, vm_size_t);