sched/numa: Add infrastructure for split shared/private accounting of NUMA hinting faults

Ideally it would be possible to distinguish between NUMA hinting faults
that are private to a task and those that are shared.  This patch prepares
infrastructure for separately accounting shared and private faults by
allocating the necessary buffers and passing in relevant information. For
now, all faults are treated as private and detection will be introduced
later.

Signed-off-by: Mel Gorman <mgorman@suse.de>
Reviewed-by: Rik van Riel <riel@redhat.com>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
Signed-off-by: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/1381141781-10992-26-git-send-email-mgorman@suse.de
Signed-off-by: Ingo Molnar <mingo@kernel.org>

1 files changed, 6 insertions, 2 deletions

diff --git a/mm/memory.c b/mm/memory.c
index ed51f15136ee..24bc9b848af6 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -3536,6 +3536,7 @@ int do_numa_page(struct mm_struct *mm, struct vm_area_struct *vma,
         struct page *page = NULL;
         spinlock_t *ptl;
         int page_nid = -1;
+        int last_nid;
         int target_nid;
         bool migrated = false;
 
@@ -3566,6 +3567,7 @@ int do_numa_page(struct mm_struct *mm, struct vm_area_struct *vma,
         }
         BUG_ON(is_zero_pfn(page_to_pfn(page)));
 
+        last_nid = page_nid_last(page);
         page_nid = page_to_nid(page);
         target_nid = numa_migrate_prep(page, vma, addr, page_nid);
         pte_unmap_unlock(ptep, ptl);
@@ -3581,7 +3583,7 @@ int do_numa_page(struct mm_struct *mm, struct vm_area_struct *vma,
 
 out:
         if (page_nid != -1)
-                task_numa_fault(page_nid, 1, migrated);
+                task_numa_fault(last_nid, page_nid, 1, migrated);
         return 0;
 }
 
@@ -3596,6 +3598,7 @@ static int do_pmd_numa_page(struct mm_struct *mm, struct vm_area_struct *vma,
         unsigned long offset;
         spinlock_t *ptl;
         bool numa = false;
+        int last_nid;
 
         spin_lock(&mm->page_table_lock);
         pmd = *pmdp;
@@ -3643,6 +3646,7 @@ static int do_pmd_numa_page(struct mm_struct *mm, struct vm_area_struct *vma,
                 if (unlikely(page_mapcount(page) != 1))
                         continue;
 
+                last_nid = page_nid_last(page);
                 page_nid = page_to_nid(page);
                 target_nid = numa_migrate_prep(page, vma, addr, page_nid);
                 pte_unmap_unlock(pte, ptl);
@@ -3655,7 +3659,7 @@ static int do_pmd_numa_page(struct mm_struct *mm, struct vm_area_struct *vma,
                 }
 
                 if (page_nid != -1)
-                        task_numa_fault(page_nid, 1, migrated);
+                        task_numa_fault(last_nid, page_nid, 1, migrated);
 
                 pte = pte_offset_map_lock(mm, pmdp, addr, &ptl);
         }