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mm, page_alloc: avoid looking up the first zone in a zonelist twice

Browse source 
The allocator fast path looks up the first usable zone in a zonelist and
then get_page_from_freelist does the same job in the zonelist iterator.
This patch preserves the necessary information.

                                             4.6.0-rc2                  4.6.0-rc2
                                        fastmark-v1r20             initonce-v1r20
  Min      alloc-odr0-1               364.00 (  0.00%)           359.00 (  1.37%)
  Min      alloc-odr0-2               262.00 (  0.00%)           260.00 (  0.76%)
  Min      alloc-odr0-4               214.00 (  0.00%)           214.00 (  0.00%)
  Min      alloc-odr0-8               186.00 (  0.00%)           186.00 (  0.00%)
  Min      alloc-odr0-16              173.00 (  0.00%)           173.00 (  0.00%)
  Min      alloc-odr0-32              165.00 (  0.00%)           165.00 (  0.00%)
  Min      alloc-odr0-64              161.00 (  0.00%)           162.00 ( -0.62%)
  Min      alloc-odr0-128             159.00 (  0.00%)           161.00 ( -1.26%)
  Min      alloc-odr0-256             168.00 (  0.00%)           170.00 ( -1.19%)
  Min      alloc-odr0-512             180.00 (  0.00%)           181.00 ( -0.56%)
  Min      alloc-odr0-1024            190.00 (  0.00%)           190.00 (  0.00%)
  Min      alloc-odr0-2048            196.00 (  0.00%)           196.00 (  0.00%)
  Min      alloc-odr0-4096            202.00 (  0.00%)           202.00 (  0.00%)
  Min      alloc-odr0-8192            206.00 (  0.00%)           205.00 (  0.49%)
  Min      alloc-odr0-16384           206.00 (  0.00%)           205.00 (  0.49%)

The benefit is negligible and the results are within the noise but each
cycle counts.

Signed-off-by: Mel Gorman <[email protected]>
Cc: Vlastimil Babka <[email protected]>
Cc: Jesper Dangaard Brouer <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Mel Gorman 2016-05-19 17:14:10 -07:00 • committed by Linus Torvalds
commit c33d6c06f6
5 changed files with 43 additions and 40 deletions
Download patch file Download diff file Expand all files Collapse all files

19
mm/mempolicy.c
View file

@ -1739,18 +1739,18 @@ unsigned int mempolicy_slab_node(void)
return interleave_nodes(policy);
case MPOL_BIND: {
struct zoneref *z;
/*
* Follow bind policy behavior and start allocation at the
* first node.
*/
struct zonelist *zonelist;
struct zone *zone;
enum zone_type highest_zoneidx = gfp_zone(GFP_KERNEL);
zonelist = &NODE_DATA(node)->node_zonelists[0];
(void)first_zones_zonelist(zonelist, highest_zoneidx,
&policy->v.nodes,
&zone);
return zone ? zone->node : node;
z = first_zones_zonelist(zonelist, highest_zoneidx,
&policy->v.nodes);
return z->zone ? z->zone->node : node;
}
default:
@ -2266,7 +2266,7 @@ static void sp_free(struct sp_node *n)
int mpol_misplaced(struct page *page, struct vm_area_struct *vma, unsigned long addr)
{
struct mempolicy *pol;
struct zone *zone;
struct zoneref *z;
int curnid = page_to_nid(page);
unsigned long pgoff;
int thiscpu = raw_smp_processor_id();
@ -2298,6 +2298,7 @@ int mpol_misplaced(struct page *page, struct vm_area_struct *vma, unsigned long
break;
case MPOL_BIND:
/*
* allows binding to multiple nodes.
* use current page if in policy nodemask,
@ -2306,11 +2307,11 @@ int mpol_misplaced(struct page *page, struct vm_area_struct *vma, unsigned long
*/
if (node_isset(curnid, pol->v.nodes))
goto out;
(void)first_zones_zonelist(
z = first_zones_zonelist(
node_zonelist(numa_node_id(), GFP_HIGHUSER),
gfp_zone(GFP_HIGHUSER),
&pol->v.nodes, &zone);
polnid = zone->node;
&pol->v.nodes);
polnid = z->zone->node;
break;
default: