mm: filter based on a nodemask as well as a gfp_mask

The MPOL_BIND policy creates a zonelist that is used for allocations
controlled by that mempolicy.  As the per-node zonelist is already being
filtered based on a zone id, this patch adds a version of __alloc_pages() that
takes a nodemask for further filtering.  This eliminates the need for
MPOL_BIND to create a custom zonelist.

A positive benefit of this is that allocations using MPOL_BIND now use the
local node's distance-ordered zonelist instead of a custom node-id-ordered
zonelist.  I.e., pages will be allocated from the closest allowed node with
available memory.

[Lee.Schermerhorn@hp.com: Mempolicy: update stale documentation and comments]
[Lee.Schermerhorn@hp.com: Mempolicy: make dequeue_huge_page_vma() obey MPOL_BIND nodemask]
[Lee.Schermerhorn@hp.com: Mempolicy: make dequeue_huge_page_vma() obey MPOL_BIND nodemask rework]
Signed-off-by: Mel Gorman <mel@csn.ul.ie>
Acked-by: Christoph Lameter <clameter@sgi.com>
Signed-off-by: Lee Schermerhorn <lee.schermerhorn@hp.com>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: Mel Gorman <mel@csn.ul.ie>
Cc: Hugh Dickins <hugh@veritas.com>
Cc: Nick Piggin <nickpiggin@yahoo.com.au>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 36 insertions, 14 deletions

diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 6d94d04ea784..b4beb3eea8b7 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -1377,7 +1377,7 @@ static void zlc_mark_zone_full(struct zonelist *zonelist, struct zoneref *z)
  * a page.
  */
 static struct page *
-get_page_from_freelist(gfp_t gfp_mask, unsigned int order,
+get_page_from_freelist(gfp_t gfp_mask, nodemask_t *nodemask, unsigned int order,
                 struct zonelist *zonelist, int high_zoneidx, int alloc_flags)
 {
         struct zoneref *z;
@@ -1388,16 +1388,17 @@ get_page_from_freelist(gfp_t gfp_mask, unsigned int order,
         int zlc_active = 0;             /* set if using zonelist_cache */
         int did_zlc_setup = 0;          /* just call zlc_setup() one time */
 
-        z = first_zones_zonelist(zonelist, high_zoneidx);
-        classzone_idx = zonelist_zone_idx(z);
-        preferred_zone = zonelist_zone(z);
+        (void)first_zones_zonelist(zonelist, high_zoneidx, nodemask,
+                                                        &preferred_zone);
+        classzone_idx = zone_idx(preferred_zone);
 
 zonelist_scan:
         /*
          * Scan zonelist, looking for a zone with enough free.
          * See also cpuset_zone_allowed() comment in kernel/cpuset.c.
          */
-        for_each_zone_zonelist(zone, z, zonelist, high_zoneidx) {
+        for_each_zone_zonelist_nodemask(zone, z, zonelist,
+                                                high_zoneidx, nodemask) {
                 if (NUMA_BUILD && zlc_active &&
                         !zlc_zone_worth_trying(zonelist, z, allowednodes))
                                 continue;
@@ -1447,9 +1448,9 @@ try_next_zone:
 /*
  * This is the 'heart' of the zoned buddy allocator.
  */
-struct page *
-__alloc_pages(gfp_t gfp_mask, unsigned int order,
-                struct zonelist *zonelist)
+static struct page *
+__alloc_pages_internal(gfp_t gfp_mask, unsigned int order,
+                        struct zonelist *zonelist, nodemask_t *nodemask)
 {
         const gfp_t wait = gfp_mask & __GFP_WAIT;
         enum zone_type high_zoneidx = gfp_zone(gfp_mask);
@@ -1478,7 +1479,7 @@ restart:
                 return NULL;
         }
 
-        page = get_page_from_freelist(gfp_mask|__GFP_HARDWALL, order,
+        page = get_page_from_freelist(gfp_mask|__GFP_HARDWALL, nodemask, order,
                         zonelist, high_zoneidx, ALLOC_WMARK_LOW|ALLOC_CPUSET);
         if (page)
                 goto got_pg;
@@ -1523,7 +1524,7 @@ restart:
          * Ignore cpuset if GFP_ATOMIC (!wait) rather than fail alloc.
          * See also cpuset_zone_allowed() comment in kernel/cpuset.c.
          */
-        page = get_page_from_freelist(gfp_mask, order, zonelist,
+        page = get_page_from_freelist(gfp_mask, nodemask, order, zonelist,
                                                 high_zoneidx, alloc_flags);
         if (page)
                 goto got_pg;
@@ -1536,7 +1537,7 @@ rebalance:
                 if (!(gfp_mask & __GFP_NOMEMALLOC)) {
 nofail_alloc:
                         /* go through the zonelist yet again, ignoring mins */
-                        page = get_page_from_freelist(gfp_mask, order,
+                        page = get_page_from_freelist(gfp_mask, nodemask, order,
                                 zonelist, high_zoneidx, ALLOC_NO_WATERMARKS);
                         if (page)
                                 goto got_pg;
@@ -1571,7 +1572,7 @@ nofail_alloc:
                 drain_all_pages();
 
         if (likely(did_some_progress)) {
-                page = get_page_from_freelist(gfp_mask, order,
+                page = get_page_from_freelist(gfp_mask, nodemask, order,
                                         zonelist, high_zoneidx, alloc_flags);
                 if (page)
                         goto got_pg;
@@ -1587,8 +1588,9 @@ nofail_alloc:
                  * a parallel oom killing, we must fail if we're still
                  * under heavy pressure.
                  */
-                page = get_page_from_freelist(gfp_mask|__GFP_HARDWALL, order,
-                        zonelist, high_zoneidx, ALLOC_WMARK_HIGH|ALLOC_CPUSET);
+                page = get_page_from_freelist(gfp_mask|__GFP_HARDWALL, nodemask,
+                        order, zonelist, high_zoneidx,
+                        ALLOC_WMARK_HIGH|ALLOC_CPUSET);
                 if (page) {
                         clear_zonelist_oom(zonelist, gfp_mask);
                         goto got_pg;
@@ -1637,6 +1639,20 @@ got_pg:
         return page;
 }
 
+struct page *
+__alloc_pages(gfp_t gfp_mask, unsigned int order,
+                struct zonelist *zonelist)
+{
+        return __alloc_pages_internal(gfp_mask, order, zonelist, NULL);
+}
+
+struct page *
+__alloc_pages_nodemask(gfp_t gfp_mask, unsigned int order,
+                struct zonelist *zonelist, nodemask_t *nodemask)
+{
+        return __alloc_pages_internal(gfp_mask, order, zonelist, nodemask);
+}
+
 EXPORT_SYMBOL(__alloc_pages);
 
 /*
@@ -1880,6 +1896,12 @@ void show_free_areas(void)
         show_swap_cache_info();
 }
 
+static void zoneref_set_zone(struct zone *zone, struct zoneref *zoneref)
+{
+        zoneref->zone = zone;
+        zoneref->zone_idx = zone_idx(zone);
+}
+
 /*
  * Builds allocation fallback zone lists.
  *