There are three callers of task_numa_fault():
- do_huge_pmd_numa_page():
Accounts against the current node, not the node where the
page resides, unless we migrated, in which case it accounts
against the node we migrated to.
- do_numa_page():
Accounts against the current node, not the node where the
page resides, unless we migrated, in which case it accounts
against the node we migrated to.
- do_pmd_numa_page():
Accounts not at all when the page isn't migrated, otherwise
accounts against the node we migrated towards.
This seems wrong to me; all three sites should have the same
sementaics, furthermore we should accounts against where the page
really is, we already know where the task is.
So modify all three sites to always account; we did after all receive
the fault; and always account to where the page is after migration,
regardless of success.
They all still differ on when they clear the PTE/PMD; ideally that
would get sorted too.
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>
Cc: <stable@kernel.org>
Signed-off-by: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/1381141781-10992-8-git-send-email-mgorman@suse.de
Signed-off-by: Ingo Molnar <mingo@kernel.org>
struct anon_vma *anon_vma = NULL;
struct page *page;
unsigned long haddr = addr & HPAGE_PMD_MASK;
struct anon_vma *anon_vma = NULL;
struct page *page;
unsigned long haddr = addr & HPAGE_PMD_MASK;
+ int page_nid = -1, this_nid = numa_node_id();
- int current_nid = -1;
- bool migrated, page_locked;
+ bool page_locked;
+ bool migrated = false;
spin_lock(&mm->page_table_lock);
if (unlikely(!pmd_same(pmd, *pmdp)))
goto out_unlock;
page = pmd_page(pmd);
spin_lock(&mm->page_table_lock);
if (unlikely(!pmd_same(pmd, *pmdp)))
goto out_unlock;
page = pmd_page(pmd);
- current_nid = page_to_nid(page);
+ page_nid = page_to_nid(page);
count_vm_numa_event(NUMA_HINT_FAULTS);
count_vm_numa_event(NUMA_HINT_FAULTS);
- if (current_nid == numa_node_id())
+ if (page_nid == this_nid)
count_vm_numa_event(NUMA_HINT_FAULTS_LOCAL);
/*
count_vm_numa_event(NUMA_HINT_FAULTS_LOCAL);
/*
spin_unlock(&mm->page_table_lock);
migrated = migrate_misplaced_transhuge_page(mm, vma,
pmdp, pmd, addr, page, target_nid);
spin_unlock(&mm->page_table_lock);
migrated = migrate_misplaced_transhuge_page(mm, vma,
pmdp, pmd, addr, page, target_nid);
+ if (migrated)
+ page_nid = target_nid;
+ else
- task_numa_fault(target_nid, HPAGE_PMD_NR, true);
- if (anon_vma)
- page_unlock_anon_vma_read(anon_vma);
- return 0;
check_same:
spin_lock(&mm->page_table_lock);
if (unlikely(!pmd_same(pmd, *pmdp))) {
/* Someone else took our fault */
check_same:
spin_lock(&mm->page_table_lock);
if (unlikely(!pmd_same(pmd, *pmdp))) {
/* Someone else took our fault */
goto out_unlock;
}
clear_pmdnuma:
goto out_unlock;
}
clear_pmdnuma:
if (anon_vma)
page_unlock_anon_vma_read(anon_vma);
if (anon_vma)
page_unlock_anon_vma_read(anon_vma);
- if (current_nid != -1)
- task_numa_fault(current_nid, HPAGE_PMD_NR, false);
+ if (page_nid != -1)
+ task_numa_fault(page_nid, HPAGE_PMD_NR, migrated);
+
}
int numa_migrate_prep(struct page *page, 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);
{
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);
count_vm_numa_event(NUMA_HINT_FAULTS_LOCAL);
return mpol_misplaced(page, vma, addr);
{
struct page *page = NULL;
spinlock_t *ptl;
{
struct page *page = NULL;
spinlock_t *ptl;
int target_nid;
bool migrated = false;
int target_nid;
bool migrated = false;
- current_nid = page_to_nid(page);
- target_nid = numa_migrate_prep(page, vma, addr, current_nid);
+ 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) {
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;
}
put_page(page);
goto out;
}
/* Migrate to the requested node */
migrated = migrate_misplaced_page(page, target_nid);
if (migrated)
/* Migrate to the requested node */
migrated = migrate_misplaced_page(page, target_nid);
if (migrated)
- current_nid = target_nid;
- if (current_nid != -1)
- task_numa_fault(current_nid, 1, migrated);
+ if (page_nid != -1)
+ task_numa_fault(page_nid, 1, migrated);
unsigned long offset;
spinlock_t *ptl;
bool numa = false;
unsigned long offset;
spinlock_t *ptl;
bool numa = false;
- int local_nid = numa_node_id();
spin_lock(&mm->page_table_lock);
pmd = *pmdp;
spin_lock(&mm->page_table_lock);
pmd = *pmdp;
for (addr = _addr + offset; addr < _addr + PMD_SIZE; pte++, addr += PAGE_SIZE) {
pte_t pteval = *pte;
struct page *page;
for (addr = _addr + offset; addr < _addr + PMD_SIZE; pte++, addr += PAGE_SIZE) {
pte_t pteval = *pte;
struct page *page;
- int curr_nid = local_nid;
+ bool migrated = false;
+
if (!pte_present(pteval))
continue;
if (!pte_numa(pteval))
if (!pte_present(pteval))
continue;
if (!pte_numa(pteval))
if (unlikely(page_mapcount(page) != 1))
continue;
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) {
+ 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 {
- /* 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(page_nid, 1, migrated);
pte = pte_offset_map_lock(mm, pmdp, addr, &ptl);
}
pte = pte_offset_map_lock(mm, pmdp, addr, &ptl);
}