sched/numa: Set preferred NUMA node based on number of private faults

[platform/adaptation/renesas_rcar/renesas_kernel.git] / mm / memory.c

diff --git a/mm/memory.c b/mm/memory.c
index ca00039..cc7f206 100644 (file)
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -69,8 +69,8 @@
 
 #include "internal.h"
 
-#ifdef LAST_NID_NOT_IN_PAGE_FLAGS
-#warning Unfortunate NUMA and NUMA Balancing config, growing page-frame for last_nid.
+#ifdef LAST_NIDPID_NOT_IN_PAGE_FLAGS
+#warning Unfortunate NUMA and NUMA Balancing config, growing page-frame for last_nidpid.
 #endif
 
 #ifndef CONFIG_NEED_MULTIPLE_NODES
@@ -3519,12 +3519,12 @@ static int do_nonlinear_fault(struct mm_struct *mm, struct vm_area_struct *vma,
 }
 
 int numa_migrate_prep(struct page *page, struct vm_area_struct *vma,
-                               unsigned long addr, int current_nid)
+                               unsigned long addr, int page_nid)
 {
        get_page(page);
 
        count_vm_numa_event(NUMA_HINT_FAULTS);
-       if (current_nid == numa_node_id())
+       if (page_nid == numa_node_id())
                count_vm_numa_event(NUMA_HINT_FAULTS_LOCAL);
 
        return mpol_misplaced(page, vma, addr);
@@ -3535,7 +3535,8 @@ int do_numa_page(struct mm_struct *mm, struct vm_area_struct *vma,
 {
        struct page *page = NULL;
        spinlock_t *ptl;
-       int current_nid = -1;
+       int page_nid = -1;
+       int last_nidpid;
        int target_nid;
        bool migrated = false;
 
@@ -3564,28 +3565,25 @@ int do_numa_page(struct mm_struct *mm, struct vm_area_struct *vma,
                pte_unmap_unlock(ptep, ptl);
                return 0;
        }
+       BUG_ON(is_zero_pfn(page_to_pfn(page)));
 
-       current_nid = page_to_nid(page);
-       target_nid = numa_migrate_prep(page, vma, addr, current_nid);
+       last_nidpid = page_nidpid_last(page);
+       page_nid = page_to_nid(page);
+       target_nid = numa_migrate_prep(page, vma, addr, page_nid);
        pte_unmap_unlock(ptep, ptl);
        if (target_nid == -1) {
-               /*
-                * Account for the fault against the current node if it not
-                * being replaced regardless of where the page is located.
-                */
-               current_nid = numa_node_id();
                put_page(page);
                goto out;
        }
 
        /* Migrate to the requested node */
-       migrated = migrate_misplaced_page(page, target_nid);
+       migrated = migrate_misplaced_page(page, vma, target_nid);
        if (migrated)
-               current_nid = target_nid;
+               page_nid = target_nid;
 
 out:
-       if (current_nid != -1)
-               task_numa_fault(current_nid, 1, migrated);
+       if (page_nid != -1)
+               task_numa_fault(last_nidpid, page_nid, 1, migrated);
        return 0;
 }
 
@@ -3600,7 +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 local_nid = numa_node_id();
+       int last_nidpid;
 
        spin_lock(&mm->page_table_lock);
        pmd = *pmdp;
@@ -3623,9 +3621,10 @@ static int do_pmd_numa_page(struct mm_struct *mm, struct vm_area_struct *vma,
        for (addr = _addr + offset; addr < _addr + PMD_SIZE; pte++, addr += PAGE_SIZE) {
                pte_t pteval = *pte;
                struct page *page;
-               int curr_nid = local_nid;
+               int page_nid = -1;
                int target_nid;
-               bool migrated;
+               bool migrated = false;
+
                if (!pte_present(pteval))
                        continue;
                if (!pte_numa(pteval))
@@ -3643,29 +3642,21 @@ static int do_pmd_numa_page(struct mm_struct *mm, struct vm_area_struct *vma,
                page = vm_normal_page(vma, addr, pteval);
                if (unlikely(!page))
                        continue;
-               /* only check non-shared pages */
-               if (unlikely(page_mapcount(page) != 1))
-                       continue;
 
-               /*
-                * Note that the NUMA fault is later accounted to either
-                * the node that is currently running or where the page is
-                * migrated to.
-                */
-               curr_nid = local_nid;
-               target_nid = numa_migrate_prep(page, vma, addr,
-                                              page_to_nid(page));
-               if (target_nid == -1) {
+               last_nidpid = page_nidpid_last(page);
+               page_nid = page_to_nid(page);
+               target_nid = numa_migrate_prep(page, vma, addr, page_nid);
+               pte_unmap_unlock(pte, ptl);
+               if (target_nid != -1) {
+                       migrated = migrate_misplaced_page(page, vma, target_nid);
+                       if (migrated)
+                               page_nid = target_nid;
+               } else {
                        put_page(page);
-                       continue;
                }
 
-               /* Migrate to the requested node */
-               pte_unmap_unlock(pte, ptl);
-               migrated = migrate_misplaced_page(page, target_nid);
-               if (migrated)
-                       curr_nid = target_nid;
-               task_numa_fault(curr_nid, 1, migrated);
+               if (page_nid != -1)
+                       task_numa_fault(last_nidpid, page_nid, 1, migrated);
 
                pte = pte_offset_map_lock(mm, pmdp, addr, &ptl);
        }