page allocator: calculate the migratetype for allocation only once

GFP mask is converted into a migratetype when deciding which pagelist to
take a page from.  However, it is happening multiple times per allocation,
at least once per zone traversed.  Calculate it once.

Signed-off-by: Mel Gorman <mel@csn.ul.ie>
Cc: Christoph Lameter <cl@linux-foundation.org>
Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Cc: Pekka Enberg <penberg@cs.helsinki.fi>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Nick Piggin <nickpiggin@yahoo.com.au>
Cc: Dave Hansen <dave@linux.vnet.ibm.com>
Cc: Lee Schermerhorn <Lee.Schermerhorn@hp.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 26 insertions, 17 deletions

diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 8fc6d1f42f0b..d3be076ea9c5 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -1061,13 +1061,13 @@ void split_page(struct page *page, unsigned int order)
  * or two.
  */
 static struct page *buffered_rmqueue(struct zone *preferred_zone,
-                        struct zone *zone, int order, gfp_t gfp_flags)
+                        struct zone *zone, int order, gfp_t gfp_flags,
+                        int migratetype)
 {
         unsigned long flags;
         struct page *page;
         int cold = !!(gfp_flags & __GFP_COLD);
         int cpu;
-        int migratetype = allocflags_to_migratetype(gfp_flags);
 
 again:
         cpu  = get_cpu();
@@ -1389,7 +1389,7 @@ static void zlc_mark_zone_full(struct zonelist *zonelist, struct zoneref *z)
 static struct page *
 get_page_from_freelist(gfp_t gfp_mask, nodemask_t *nodemask, unsigned int order,
                 struct zonelist *zonelist, int high_zoneidx, int alloc_flags,
-                struct zone *preferred_zone)
+                struct zone *preferred_zone, int migratetype)
 {
         struct zoneref *z;
         struct page *page = NULL;
@@ -1433,7 +1433,8 @@ zonelist_scan:
                         }
                 }
 
-                page = buffered_rmqueue(preferred_zone, zone, order, gfp_mask);
+                page = buffered_rmqueue(preferred_zone, zone, order,
+                                                gfp_mask, migratetype);
                 if (page)
                         break;
 this_zone_full:
@@ -1495,7 +1496,8 @@ should_alloc_retry(gfp_t gfp_mask, unsigned int order,
 static inline struct page *
 __alloc_pages_may_oom(gfp_t gfp_mask, unsigned int order,
         struct zonelist *zonelist, enum zone_type high_zoneidx,
-        nodemask_t *nodemask, struct zone *preferred_zone)
+        nodemask_t *nodemask, struct zone *preferred_zone,
+        int migratetype)
 {
         struct page *page;
 
@@ -1513,7 +1515,7 @@ __alloc_pages_may_oom(gfp_t gfp_mask, unsigned int order,
         page = get_page_from_freelist(gfp_mask|__GFP_HARDWALL, nodemask,
                 order, zonelist, high_zoneidx,
                 ALLOC_WMARK_HIGH|ALLOC_CPUSET,
-                preferred_zone);
+                preferred_zone, migratetype);
         if (page)
                 goto out;
 
@@ -1534,7 +1536,7 @@ static inline struct page *
 __alloc_pages_direct_reclaim(gfp_t gfp_mask, unsigned int order,
         struct zonelist *zonelist, enum zone_type high_zoneidx,
         nodemask_t *nodemask, int alloc_flags, struct zone *preferred_zone,
-        unsigned long *did_some_progress)
+        int migratetype, unsigned long *did_some_progress)
 {
         struct page *page = NULL;
         struct reclaim_state reclaim_state;
@@ -1567,7 +1569,8 @@ __alloc_pages_direct_reclaim(gfp_t gfp_mask, unsigned int order,
         if (likely(*did_some_progress))
                 page = get_page_from_freelist(gfp_mask, nodemask, order,
                                         zonelist, high_zoneidx,
-                                        alloc_flags, preferred_zone);
+                                        alloc_flags, preferred_zone,
+                                        migratetype);
         return page;
 }
 
@@ -1587,14 +1590,15 @@ is_allocation_high_priority(struct task_struct *p, gfp_t gfp_mask)
 static inline struct page *
 __alloc_pages_high_priority(gfp_t gfp_mask, unsigned int order,
         struct zonelist *zonelist, enum zone_type high_zoneidx,
-        nodemask_t *nodemask, struct zone *preferred_zone)
+        nodemask_t *nodemask, struct zone *preferred_zone,
+        int migratetype)
 {
         struct page *page;
 
         do {
                 page = get_page_from_freelist(gfp_mask, nodemask, order,
                         zonelist, high_zoneidx, ALLOC_NO_WATERMARKS,
-                        preferred_zone);
+                        preferred_zone, migratetype);
 
                 if (!page && gfp_mask & __GFP_NOFAIL)
                         congestion_wait(WRITE, HZ/50);
@@ -1617,7 +1621,8 @@ void wake_all_kswapd(unsigned int order, struct zonelist *zonelist,
 static inline struct page *
 __alloc_pages_slowpath(gfp_t gfp_mask, unsigned int order,
         struct zonelist *zonelist, enum zone_type high_zoneidx,
-        nodemask_t *nodemask, struct zone *preferred_zone)
+        nodemask_t *nodemask, struct zone *preferred_zone,
+        int migratetype)
 {
         const gfp_t wait = gfp_mask & __GFP_WAIT;
         struct page *page = NULL;
@@ -1668,7 +1673,8 @@ restart:
          */
         page = get_page_from_freelist(gfp_mask, nodemask, order, zonelist,
                                                 high_zoneidx, alloc_flags,
-                                                preferred_zone);
+                                                preferred_zone,
+                                                migratetype);
         if (page)
                 goto got_pg;
 
@@ -1678,7 +1684,8 @@ rebalance:
                 /* Do not dip into emergency reserves if specified */
                 if (!(gfp_mask & __GFP_NOMEMALLOC)) {
                         page = __alloc_pages_high_priority(gfp_mask, order,
-                                zonelist, high_zoneidx, nodemask, preferred_zone);
+                                zonelist, high_zoneidx, nodemask, preferred_zone,
+                                migratetype);
                         if (page)
                                 goto got_pg;
                 }
@@ -1696,7 +1703,7 @@ rebalance:
                                         zonelist, high_zoneidx,
                                         nodemask,
                                         alloc_flags, preferred_zone,
-                                        &did_some_progress);
+                                        migratetype, &did_some_progress);
         if (page)
                 goto got_pg;
 
@@ -1708,7 +1715,8 @@ rebalance:
                 if ((gfp_mask & __GFP_FS) && !(gfp_mask & __GFP_NORETRY)) {
                         page = __alloc_pages_may_oom(gfp_mask, order,
                                         zonelist, high_zoneidx,
-                                        nodemask, preferred_zone);
+                                        nodemask, preferred_zone,
+                                        migratetype);
                         if (page)
                                 goto got_pg;
 
@@ -1755,6 +1763,7 @@ __alloc_pages_nodemask(gfp_t gfp_mask, unsigned int order,
         enum zone_type high_zoneidx = gfp_zone(gfp_mask);
         struct zone *preferred_zone;
         struct page *page;
+        int migratetype = allocflags_to_migratetype(gfp_mask);
 
         lockdep_trace_alloc(gfp_mask);
 
@@ -1779,11 +1788,11 @@ __alloc_pages_nodemask(gfp_t gfp_mask, unsigned int order,
         /* First allocation attempt */
         page = get_page_from_freelist(gfp_mask|__GFP_HARDWALL, nodemask, order,
                         zonelist, high_zoneidx, ALLOC_WMARK_LOW|ALLOC_CPUSET,
-                        preferred_zone);
+                        preferred_zone, migratetype);
         if (unlikely(!page))
                 page = __alloc_pages_slowpath(gfp_mask, order,
                                 zonelist, high_zoneidx, nodemask,
-                                preferred_zone);
+                                preferred_zone, migratetype);
 
         return page;
 }