[PATCH] Add NUMA policy support for huge pages.

The huge_zonelist() function in the memory policy layer provides an list of
zones ordered by NUMA distance.  The hugetlb layer will walk that list looking
for a zone that has available huge pages but is also in the nodeset of the
current cpuset.

This patch does not contain the folding of find_or_alloc_huge_page() that was
controversial in the earlier discussion.

Signed-off-by: Christoph Lameter <clameter@sgi.com>
Cc: Andi Kleen <ak@muc.de>
Acked-by: William Lee Irwin III <wli@holomorphy.com>
Cc: Adam Litke <agl@us.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 14 insertions, 10 deletions

diff --git a/mm/hugetlb.c b/mm/hugetlb.c
index e93bd63462f0..eb405565949d 100644
--- a/mm/hugetlb.c
+++ b/mm/hugetlb.c
@@ -11,6 +11,8 @@
 #include <linux/highmem.h>
 #include <linux/nodemask.h>
 #include <linux/pagemap.h>
+#include <linux/mempolicy.h>
+
 #include <asm/page.h>
 #include <asm/pgtable.h>
 
@@ -36,11 +38,12 @@ static void enqueue_huge_page(struct page *page)
         free_huge_pages_node[nid]++;
 }
 
-static struct page *dequeue_huge_page(void)
+static struct page *dequeue_huge_page(struct vm_area_struct *vma,
+                                unsigned long address)
 {
         int nid = numa_node_id();
         struct page *page = NULL;
-        struct zonelist *zonelist = NODE_DATA(nid)->node_zonelists;
+        struct zonelist *zonelist = huge_zonelist(vma, address);
         struct zone **z;
 
         for (z = zonelist->zones; *z; z++) {
@@ -87,13 +90,13 @@ void free_huge_page(struct page *page)
         spin_unlock(&hugetlb_lock);
 }
 
-struct page *alloc_huge_page(void)
+struct page *alloc_huge_page(struct vm_area_struct *vma, unsigned long addr)
 {
         struct page *page;
         int i;
 
         spin_lock(&hugetlb_lock);
-        page = dequeue_huge_page();
+        page = dequeue_huge_page(vma, addr);
         if (!page) {
                 spin_unlock(&hugetlb_lock);
                 return NULL;
@@ -196,7 +199,7 @@ static unsigned long set_max_huge_pages(unsigned long count)
         spin_lock(&hugetlb_lock);
         try_to_free_low(count);
         while (count < nr_huge_pages) {
-                struct page *page = dequeue_huge_page();
+                struct page *page = dequeue_huge_page(NULL, 0);
                 if (!page)
                         break;
                 update_and_free_page(page);
@@ -365,8 +368,9 @@ void unmap_hugepage_range(struct vm_area_struct *vma, unsigned long start,
         flush_tlb_range(vma, start, end);
 }
 
-static struct page *find_or_alloc_huge_page(struct address_space *mapping,
-                                unsigned long idx, int shared)
+static struct page *find_or_alloc_huge_page(struct vm_area_struct *vma,
+                        unsigned long addr, struct address_space *mapping,
+                        unsigned long idx, int shared)
 {
         struct page *page;
         int err;
@@ -378,7 +382,7 @@ retry:
 
         if (hugetlb_get_quota(mapping))
                 goto out;
-        page = alloc_huge_page();
+        page = alloc_huge_page(vma, addr);
         if (!page) {
                 hugetlb_put_quota(mapping);
                 goto out;
@@ -418,7 +422,7 @@ static int hugetlb_cow(struct mm_struct *mm, struct vm_area_struct *vma,
         }
 
         page_cache_get(old_page);
-        new_page = alloc_huge_page();
+        new_page = alloc_huge_page(vma, address);
 
         if (!new_page) {
                 page_cache_release(old_page);
@@ -467,7 +471,7 @@ int hugetlb_no_page(struct mm_struct *mm, struct vm_area_struct *vma,
          * Use page lock to guard against racing truncation
          * before we get page_table_lock.
          */
-        page = find_or_alloc_huge_page(mapping, idx,
+        page = find_or_alloc_huge_page(vma, address, mapping, idx,
                         vma->vm_flags & VM_SHARED);
         if (!page)
                 goto out;