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-rw-r--r--mm/memory.c139
1 files changed, 42 insertions, 97 deletions
diff --git a/mm/memory.c b/mm/memory.c
index d176154c243f..1f2287eaa88e 100644
--- 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_CPUPID_NOT_IN_PAGE_FLAGS
+#warning Unfortunate NUMA and NUMA Balancing config, growing page-frame for last_cpupid.
#endif
#ifndef CONFIG_NEED_MULTIPLE_NODES
@@ -2721,6 +2721,14 @@ static int do_wp_page(struct mm_struct *mm, struct vm_area_struct *vma,
get_page(dirty_page);
reuse:
+ /*
+ * Clear the pages cpupid information as the existing
+ * information potentially belongs to a now completely
+ * unrelated process.
+ */
+ if (old_page)
+ page_cpupid_xchg_last(old_page, (1 << LAST_CPUPID_SHIFT) - 1);
+
flush_cache_page(vma, address, pte_pfn(orig_pte));
entry = pte_mkyoung(orig_pte);
entry = maybe_mkwrite(pte_mkdirty(entry), vma);
@@ -3521,13 +3529,16 @@ 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 page_nid)
+ unsigned long addr, int page_nid,
+ int *flags)
{
get_page(page);
count_vm_numa_event(NUMA_HINT_FAULTS);
- if (page_nid == numa_node_id())
+ if (page_nid == numa_node_id()) {
count_vm_numa_event(NUMA_HINT_FAULTS_LOCAL);
+ *flags |= TNF_FAULT_LOCAL;
+ }
return mpol_misplaced(page, vma, addr);
}
@@ -3538,8 +3549,10 @@ 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_cpupid;
int target_nid;
bool migrated = false;
+ int flags = 0;
/*
* The "pte" at this point cannot be used safely without
@@ -3566,9 +3579,26 @@ 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)));
+ /*
+ * Avoid grouping on DSO/COW pages in specific and RO pages
+ * in general, RO pages shouldn't hurt as much anyway since
+ * they can be in shared cache state.
+ */
+ if (!pte_write(pte))
+ flags |= TNF_NO_GROUP;
+
+ /*
+ * Flag if the page is shared between multiple address spaces. This
+ * is later used when determining whether to group tasks together
+ */
+ if (page_mapcount(page) > 1 && (vma->vm_flags & VM_SHARED))
+ flags |= TNF_SHARED;
+
+ last_cpupid = page_cpupid_last(page);
page_nid = page_to_nid(page);
- target_nid = numa_migrate_prep(page, vma, addr, page_nid);
+ target_nid = numa_migrate_prep(page, vma, addr, page_nid, &flags);
pte_unmap_unlock(ptep, ptl);
if (target_nid == -1) {
put_page(page);
@@ -3576,102 +3606,17 @@ int do_numa_page(struct mm_struct *mm, struct vm_area_struct *vma,
}
/* Migrate to the requested node */
- migrated = migrate_misplaced_page(page, target_nid);
- if (migrated)
+ migrated = migrate_misplaced_page(page, vma, target_nid);
+ if (migrated) {
page_nid = target_nid;
+ flags |= TNF_MIGRATED;
+ }
out:
if (page_nid != -1)
- task_numa_fault(page_nid, 1, migrated);
- return 0;
-}
-
-/* NUMA hinting page fault entry point for regular pmds */
-#ifdef CONFIG_NUMA_BALANCING
-static int do_pmd_numa_page(struct mm_struct *mm, struct vm_area_struct *vma,
- unsigned long addr, pmd_t *pmdp)
-{
- pmd_t pmd;
- pte_t *pte, *orig_pte;
- unsigned long _addr = addr & PMD_MASK;
- unsigned long offset;
- spinlock_t *ptl;
- bool numa = false;
-
- spin_lock(&mm->page_table_lock);
- pmd = *pmdp;
- if (pmd_numa(pmd)) {
- set_pmd_at(mm, _addr, pmdp, pmd_mknonnuma(pmd));
- numa = true;
- }
- spin_unlock(&mm->page_table_lock);
-
- if (!numa)
- return 0;
-
- /* we're in a page fault so some vma must be in the range */
- BUG_ON(!vma);
- BUG_ON(vma->vm_start >= _addr + PMD_SIZE);
- offset = max(_addr, vma->vm_start) & ~PMD_MASK;
- VM_BUG_ON(offset >= PMD_SIZE);
- orig_pte = pte = pte_offset_map_lock(mm, pmdp, _addr, &ptl);
- pte += offset >> PAGE_SHIFT;
- for (addr = _addr + offset; addr < _addr + PMD_SIZE; pte++, addr += PAGE_SIZE) {
- pte_t pteval = *pte;
- struct page *page;
- int page_nid = -1;
- int target_nid;
- bool migrated = false;
-
- if (!pte_present(pteval))
- continue;
- if (!pte_numa(pteval))
- continue;
- if (addr >= vma->vm_end) {
- vma = find_vma(mm, addr);
- /* there's a pte present so there must be a vma */
- BUG_ON(!vma);
- BUG_ON(addr < vma->vm_start);
- }
- if (pte_numa(pteval)) {
- pteval = pte_mknonnuma(pteval);
- set_pte_at(mm, addr, pte, pteval);
- }
- page = vm_normal_page(vma, addr, pteval);
- if (unlikely(!page))
- continue;
- /* only check non-shared pages */
- if (unlikely(page_mapcount(page) != 1))
- continue;
-
- 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, target_nid);
- if (migrated)
- page_nid = target_nid;
- } else {
- put_page(page);
- }
-
- if (page_nid != -1)
- task_numa_fault(page_nid, 1, migrated);
-
- pte = pte_offset_map_lock(mm, pmdp, addr, &ptl);
- }
- pte_unmap_unlock(orig_pte, ptl);
-
- return 0;
-}
-#else
-static int do_pmd_numa_page(struct mm_struct *mm, struct vm_area_struct *vma,
- unsigned long addr, pmd_t *pmdp)
-{
- BUG();
+ task_numa_fault(last_cpupid, page_nid, 1, flags);
return 0;
}
-#endif /* CONFIG_NUMA_BALANCING */
/*
* These routines also need to handle stuff like marking pages dirty
@@ -3811,8 +3756,8 @@ retry:
}
}
- if (pmd_numa(*pmd))
- return do_pmd_numa_page(mm, vma, address, pmd);
+ /* THP should already have been handled */
+ BUG_ON(pmd_numa(*pmd));
/*
* Use __pte_alloc instead of pte_alloc_map, because we can't