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-rw-r--r--mm/compaction.c15
-rw-r--r--mm/huge_memory.c108
-rw-r--r--mm/hugetlb.c10
-rw-r--r--mm/internal.h7
-rw-r--r--mm/ksm.c6
-rw-r--r--mm/memcontrol.c7
-rw-r--r--mm/memory-failure.c7
-rw-r--r--mm/memory.c198
-rw-r--r--mm/memory_hotplug.c3
-rw-r--r--mm/mempolicy.c283
-rw-r--r--mm/migrate.c337
-rw-r--r--mm/mmap.c10
-rw-r--r--mm/mprotect.c135
-rw-r--r--mm/mremap.c2
-rw-r--r--mm/page_alloc.c10
-rw-r--r--mm/pgtable-generic.c9
-rw-r--r--mm/rmap.c66
-rw-r--r--mm/vmstat.c16
18 files changed, 1098 insertions, 131 deletions
diff --git a/mm/compaction.c b/mm/compaction.c
index 12979121822..5ad7f4f4d6f 100644
--- a/mm/compaction.c
+++ b/mm/compaction.c
@@ -303,6 +303,10 @@ static unsigned long isolate_freepages_block(struct compact_control *cc,
if (blockpfn == end_pfn)
update_pageblock_skip(cc, valid_page, total_isolated, false);
+ count_vm_events(COMPACTFREE_SCANNED, nr_scanned);
+ if (total_isolated)
+ count_vm_events(COMPACTISOLATED, total_isolated);
+
return total_isolated;
}
@@ -609,6 +613,10 @@ next_pageblock:
trace_mm_compaction_isolate_migratepages(nr_scanned, nr_isolated);
+ count_vm_events(COMPACTMIGRATE_SCANNED, nr_scanned);
+ if (nr_isolated)
+ count_vm_events(COMPACTISOLATED, nr_isolated);
+
return low_pfn;
}
@@ -1015,14 +1023,11 @@ static int compact_zone(struct zone *zone, struct compact_control *cc)
nr_migrate = cc->nr_migratepages;
err = migrate_pages(&cc->migratepages, compaction_alloc,
(unsigned long)cc, false,
- cc->sync ? MIGRATE_SYNC_LIGHT : MIGRATE_ASYNC);
+ cc->sync ? MIGRATE_SYNC_LIGHT : MIGRATE_ASYNC,
+ MR_COMPACTION);
update_nr_listpages(cc);
nr_remaining = cc->nr_migratepages;
- count_vm_event(COMPACTBLOCKS);
- count_vm_events(COMPACTPAGES, nr_migrate - nr_remaining);
- if (nr_remaining)
- count_vm_events(COMPACTPAGEFAILED, nr_remaining);
trace_mm_compaction_migratepages(nr_migrate - nr_remaining,
nr_remaining);
diff --git a/mm/huge_memory.c b/mm/huge_memory.c
index 827d9c81305..d7ee1691fd2 100644
--- a/mm/huge_memory.c
+++ b/mm/huge_memory.c
@@ -19,6 +19,7 @@
#include <linux/freezer.h>
#include <linux/mman.h>
#include <linux/pagemap.h>
+#include <linux/migrate.h>
#include <asm/tlb.h>
#include <asm/pgalloc.h>
@@ -690,7 +691,7 @@ out:
}
__setup("transparent_hugepage=", setup_transparent_hugepage);
-static inline pmd_t maybe_pmd_mkwrite(pmd_t pmd, struct vm_area_struct *vma)
+pmd_t maybe_pmd_mkwrite(pmd_t pmd, struct vm_area_struct *vma)
{
if (likely(vma->vm_flags & VM_WRITE))
pmd = pmd_mkwrite(pmd);
@@ -848,7 +849,8 @@ out:
* run pte_offset_map on the pmd, if an huge pmd could
* materialize from under us from a different thread.
*/
- if (unlikely(__pte_alloc(mm, vma, pmd, address)))
+ if (unlikely(pmd_none(*pmd)) &&
+ unlikely(__pte_alloc(mm, vma, pmd, address)))
return VM_FAULT_OOM;
/* if an huge pmd materialized from under us just retry later */
if (unlikely(pmd_trans_huge(*pmd)))
@@ -1287,6 +1289,81 @@ out:
return page;
}
+/* NUMA hinting page fault entry point for trans huge pmds */
+int do_huge_pmd_numa_page(struct mm_struct *mm, struct vm_area_struct *vma,
+ unsigned long addr, pmd_t pmd, pmd_t *pmdp)
+{
+ struct page *page;
+ unsigned long haddr = addr & HPAGE_PMD_MASK;
+ int target_nid;
+ int current_nid = -1;
+ bool migrated;
+ bool page_locked = false;
+
+ spin_lock(&mm->page_table_lock);
+ if (unlikely(!pmd_same(pmd, *pmdp)))
+ goto out_unlock;
+
+ page = pmd_page(pmd);
+ get_page(page);
+ current_nid = page_to_nid(page);
+ count_vm_numa_event(NUMA_HINT_FAULTS);
+ if (current_nid == numa_node_id())
+ count_vm_numa_event(NUMA_HINT_FAULTS_LOCAL);
+
+ target_nid = mpol_misplaced(page, vma, haddr);
+ if (target_nid == -1) {
+ put_page(page);
+ goto clear_pmdnuma;
+ }
+
+ /* Acquire the page lock to serialise THP migrations */
+ spin_unlock(&mm->page_table_lock);
+ lock_page(page);
+ page_locked = true;
+
+ /* Confirm the PTE did not while locked */
+ spin_lock(&mm->page_table_lock);
+ if (unlikely(!pmd_same(pmd, *pmdp))) {
+ unlock_page(page);
+ put_page(page);
+ goto out_unlock;
+ }
+ spin_unlock(&mm->page_table_lock);
+
+ /* Migrate the THP to the requested node */
+ migrated = migrate_misplaced_transhuge_page(mm, vma,
+ pmdp, pmd, addr,
+ page, target_nid);
+ if (migrated)
+ current_nid = target_nid;
+ else {
+ spin_lock(&mm->page_table_lock);
+ if (unlikely(!pmd_same(pmd, *pmdp))) {
+ unlock_page(page);
+ goto out_unlock;
+ }
+ goto clear_pmdnuma;
+ }
+
+ task_numa_fault(current_nid, HPAGE_PMD_NR, migrated);
+ return 0;
+
+clear_pmdnuma:
+ pmd = pmd_mknonnuma(pmd);
+ set_pmd_at(mm, haddr, pmdp, pmd);
+ VM_BUG_ON(pmd_numa(*pmdp));
+ update_mmu_cache_pmd(vma, addr, pmdp);
+ if (page_locked)
+ unlock_page(page);
+
+out_unlock:
+ spin_unlock(&mm->page_table_lock);
+ if (current_nid != -1)
+ task_numa_fault(current_nid, HPAGE_PMD_NR, migrated);
+ return 0;
+}
+
int zap_huge_pmd(struct mmu_gather *tlb, struct vm_area_struct *vma,
pmd_t *pmd, unsigned long addr)
{
@@ -1375,7 +1452,7 @@ out:
}
int change_huge_pmd(struct vm_area_struct *vma, pmd_t *pmd,
- unsigned long addr, pgprot_t newprot)
+ unsigned long addr, pgprot_t newprot, int prot_numa)
{
struct mm_struct *mm = vma->vm_mm;
int ret = 0;
@@ -1383,7 +1460,17 @@ int change_huge_pmd(struct vm_area_struct *vma, pmd_t *pmd,
if (__pmd_trans_huge_lock(pmd, vma) == 1) {
pmd_t entry;
entry = pmdp_get_and_clear(mm, addr, pmd);
- entry = pmd_modify(entry, newprot);
+ if (!prot_numa)
+ entry = pmd_modify(entry, newprot);
+ else {
+ struct page *page = pmd_page(*pmd);
+
+ /* only check non-shared pages */
+ if (page_mapcount(page) == 1 &&
+ !pmd_numa(*pmd)) {
+ entry = pmd_mknuma(entry);
+ }
+ }
BUG_ON(pmd_write(entry));
set_pmd_at(mm, addr, pmd, entry);
spin_unlock(&vma->vm_mm->page_table_lock);
@@ -1474,7 +1561,7 @@ static int __split_huge_page_splitting(struct page *page,
* We can't temporarily set the pmd to null in order
* to split it, the pmd must remain marked huge at all
* times or the VM won't take the pmd_trans_huge paths
- * and it won't wait on the anon_vma->root->mutex to
+ * and it won't wait on the anon_vma->root->rwsem to
* serialize against split_huge_page*.
*/
pmdp_splitting_flush(vma, address, pmd);
@@ -1565,6 +1652,7 @@ static void __split_huge_page_refcount(struct page *page)
page_tail->mapping = page->mapping;
page_tail->index = page->index + i;
+ page_xchg_last_nid(page_tail, page_last_nid(page));
BUG_ON(!PageAnon(page_tail));
BUG_ON(!PageUptodate(page_tail));
@@ -1632,6 +1720,8 @@ static int __split_huge_page_map(struct page *page,
BUG_ON(page_mapcount(page) != 1);
if (!pmd_young(*pmd))
entry = pte_mkold(entry);
+ if (pmd_numa(*pmd))
+ entry = pte_mknuma(entry);
pte = pte_offset_map(&_pmd, haddr);
BUG_ON(!pte_none(*pte));
set_pte_at(mm, haddr, pte, entry);
@@ -1674,7 +1764,7 @@ static int __split_huge_page_map(struct page *page,
return ret;
}
-/* must be called with anon_vma->root->mutex hold */
+/* must be called with anon_vma->root->rwsem held */
static void __split_huge_page(struct page *page,
struct anon_vma *anon_vma)
{
@@ -1729,7 +1819,7 @@ int split_huge_page(struct page *page)
BUG_ON(is_huge_zero_pfn(page_to_pfn(page)));
BUG_ON(!PageAnon(page));
- anon_vma = page_lock_anon_vma(page);
+ anon_vma = page_lock_anon_vma_read(page);
if (!anon_vma)
goto out;
ret = 0;
@@ -1742,7 +1832,7 @@ int split_huge_page(struct page *page)
BUG_ON(PageCompound(page));
out_unlock:
- page_unlock_anon_vma(anon_vma);
+ page_unlock_anon_vma_read(anon_vma);
out:
return ret;
}
@@ -2234,7 +2324,7 @@ static void collapse_huge_page(struct mm_struct *mm,
if (pmd_trans_huge(*pmd))
goto out;
- anon_vma_lock(vma->anon_vma);
+ anon_vma_lock_write(vma->anon_vma);
pte = pte_offset_map(pmd, address);
ptl = pte_lockptr(mm, pmd);
diff --git a/mm/hugetlb.c b/mm/hugetlb.c
index 88e7293b96b..e5318c7793a 100644
--- a/mm/hugetlb.c
+++ b/mm/hugetlb.c
@@ -3016,7 +3016,7 @@ same_page:
return i ? i : -EFAULT;
}
-void hugetlb_change_protection(struct vm_area_struct *vma,
+unsigned long hugetlb_change_protection(struct vm_area_struct *vma,
unsigned long address, unsigned long end, pgprot_t newprot)
{
struct mm_struct *mm = vma->vm_mm;
@@ -3024,6 +3024,7 @@ void hugetlb_change_protection(struct vm_area_struct *vma,
pte_t *ptep;
pte_t pte;
struct hstate *h = hstate_vma(vma);
+ unsigned long pages = 0;
BUG_ON(address >= end);
flush_cache_range(vma, address, end);
@@ -3034,12 +3035,15 @@ void hugetlb_change_protection(struct vm_area_struct *vma,
ptep = huge_pte_offset(mm, address);
if (!ptep)
continue;
- if (huge_pmd_unshare(mm, &address, ptep))
+ if (huge_pmd_unshare(mm, &address, ptep)) {
+ pages++;
continue;
+ }
if (!huge_pte_none(huge_ptep_get(ptep))) {
pte = huge_ptep_get_and_clear(mm, address, ptep);
pte = pte_mkhuge(pte_modify(pte, newprot));
set_huge_pte_at(mm, address, ptep, pte);
+ pages++;
}
}
spin_unlock(&mm->page_table_lock);
@@ -3051,6 +3055,8 @@ void hugetlb_change_protection(struct vm_area_struct *vma,
*/
flush_tlb_range(vma, start, end);
mutex_unlock(&vma->vm_file->f_mapping->i_mmap_mutex);
+
+ return pages << h->order;
}
int hugetlb_reserve_pages(struct inode *inode,
diff --git a/mm/internal.h b/mm/internal.h
index 52d1fa95719..d597f94cc20 100644
--- a/mm/internal.h
+++ b/mm/internal.h
@@ -217,15 +217,18 @@ static inline void mlock_migrate_page(struct page *newpage, struct page *page)
{
if (TestClearPageMlocked(page)) {
unsigned long flags;
+ int nr_pages = hpage_nr_pages(page);
local_irq_save(flags);
- __dec_zone_page_state(page, NR_MLOCK);
+ __mod_zone_page_state(page_zone(page), NR_MLOCK, -nr_pages);
SetPageMlocked(newpage);
- __inc_zone_page_state(newpage, NR_MLOCK);
+ __mod_zone_page_state(page_zone(newpage), NR_MLOCK, nr_pages);
local_irq_restore(flags);
}
}
+extern pmd_t maybe_pmd_mkwrite(pmd_t pmd, struct vm_area_struct *vma);
+
#ifdef CONFIG_TRANSPARENT_HUGEPAGE
extern unsigned long vma_address(struct page *page,
struct vm_area_struct *vma);
diff --git a/mm/ksm.c b/mm/ksm.c
index 382d930a0bf..82dfb4b5432 100644
--- a/mm/ksm.c
+++ b/mm/ksm.c
@@ -1624,7 +1624,7 @@ again:
struct anon_vma_chain *vmac;
struct vm_area_struct *vma;
- anon_vma_lock(anon_vma);
+ anon_vma_lock_write(anon_vma);
anon_vma_interval_tree_foreach(vmac, &anon_vma->rb_root,
0, ULONG_MAX) {
vma = vmac->vma;
@@ -1678,7 +1678,7 @@ again:
struct anon_vma_chain *vmac;
struct vm_area_struct *vma;
- anon_vma_lock(anon_vma);
+ anon_vma_lock_write(anon_vma);
anon_vma_interval_tree_foreach(vmac, &anon_vma->rb_root,
0, ULONG_MAX) {
vma = vmac->vma;
@@ -1731,7 +1731,7 @@ again:
struct anon_vma_chain *vmac;
struct vm_area_struct *vma;
- anon_vma_lock(anon_vma);
+ anon_vma_lock_write(anon_vma);
anon_vma_interval_tree_foreach(vmac, &anon_vma->rb_root,
0, ULONG_MAX) {
vma = vmac->vma;
diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index 6c055929c8c..bbfac5063ca 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -3289,15 +3289,18 @@ void mem_cgroup_prepare_migration(struct page *page, struct page *newpage,
struct mem_cgroup **memcgp)
{
struct mem_cgroup *memcg = NULL;
+ unsigned int nr_pages = 1;
struct page_cgroup *pc;
enum charge_type ctype;
*memcgp = NULL;
- VM_BUG_ON(PageTransHuge(page));
if (mem_cgroup_disabled())
return;
+ if (PageTransHuge(page))
+ nr_pages <<= compound_order(page);
+
pc = lookup_page_cgroup(page);
lock_page_cgroup(pc);
if (PageCgroupUsed(pc)) {
@@ -3359,7 +3362,7 @@ void mem_cgroup_prepare_migration(struct page *page, struct page *newpage,
* charged to the res_counter since we plan on replacing the
* old one and only one page is going to be left afterwards.
*/
- __mem_cgroup_commit_charge(memcg, newpage, 1, ctype, false);
+ __mem_cgroup_commit_charge(memcg, newpage, nr_pages, ctype, false);
}
/* remove redundant charge if migration failed*/
diff --git a/mm/memory-failure.c b/mm/memory-failure.c
index 108c52fa60f..c6e4dd3e1c0 100644
--- a/mm/memory-failure.c
+++ b/mm/memory-failure.c
@@ -402,7 +402,7 @@ static void collect_procs_anon(struct page *page, struct list_head *to_kill,
struct anon_vma *av;
pgoff_t pgoff;
- av = page_lock_anon_vma(page);
+ av = page_lock_anon_vma_read(page);
if (av == NULL) /* Not actually mapped anymore */
return;
@@ -423,7 +423,7 @@ static void collect_procs_anon(struct page *page, struct list_head *to_kill,
}
}
read_unlock(&tasklist_lock);
- page_unlock_anon_vma(av);
+ page_unlock_anon_vma_read(av);
}
/*
@@ -1566,7 +1566,8 @@ int soft_offline_page(struct page *page, int flags)
page_is_file_cache(page));
list_add(&page->lru, &pagelist);
ret = migrate_pages(&pagelist, new_page, MPOL_MF_MOVE_ALL,
- false, MIGRATE_SYNC);
+ false, MIGRATE_SYNC,
+ MR_MEMORY_FAILURE);
if (ret) {
putback_lru_pages(&pagelist);
pr_info("soft offline: %#lx: migration failed %d, type %lx\n",
diff --git a/mm/memory.c b/mm/memory.c
index db2e9e797a0..e6a3b933517 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -57,6 +57,7 @@
#include <linux/swapops.h>
#include <linux/elf.h>
#include <linux/gfp.h>
+#include <linux/migrate.h>
#include <asm/io.h>
#include <asm/pgalloc.h>
@@ -1503,6 +1504,8 @@ struct page *follow_page(struct vm_area_struct *vma, unsigned long address,
page = follow_huge_pmd(mm, address, pmd, flags & FOLL_WRITE);
goto out;
}
+ if ((flags & FOLL_NUMA) && pmd_numa(*pmd))
+ goto no_page_table;
if (pmd_trans_huge(*pmd)) {
if (flags & FOLL_SPLIT) {
split_huge_page_pmd(vma, address, pmd);
@@ -1532,6 +1535,8 @@ split_fallthrough:
pte = *ptep;
if (!pte_present(pte))
goto no_page;
+ if ((flags & FOLL_NUMA) && pte_numa(pte))
+ goto no_page;
if ((flags & FOLL_WRITE) && !pte_write(pte))
goto unlock;
@@ -1683,6 +1688,19 @@ int __get_user_pages(struct task_struct *tsk, struct mm_struct *mm,
(VM_WRITE | VM_MAYWRITE) : (VM_READ | VM_MAYREAD);
vm_flags &= (gup_flags & FOLL_FORCE) ?
(VM_MAYREAD | VM_MAYWRITE) : (VM_READ | VM_WRITE);
+
+ /*
+ * If FOLL_FORCE and FOLL_NUMA are both set, handle_mm_fault
+ * would be called on PROT_NONE ranges. We must never invoke
+ * handle_mm_fault on PROT_NONE ranges or the NUMA hinting
+ * page faults would unprotect the PROT_NONE ranges if
+ * _PAGE_NUMA and _PAGE_PROTNONE are sharing the same pte/pmd
+ * bitflag. So to avoid that, don't set FOLL_NUMA if
+ * FOLL_FORCE is set.
+ */
+ if (!(gup_flags & FOLL_FORCE))
+ gup_flags |= FOLL_NUMA;
+
i = 0;
do {
@@ -3412,6 +3430,169 @@ static int do_nonlinear_fault(struct mm_struct *mm, struct vm_area_struct *vma,
return __do_fault(mm, vma, address, pmd, pgoff, flags, orig_pte);
}
+int numa_migrate_prep(struct page *page, struct vm_area_struct *vma,
+ unsigned long addr, int current_nid)
+{
+ get_page(page);
+
+ count_vm_numa_event(NUMA_HINT_FAULTS);
+ if (current_nid == numa_node_id())
+ count_vm_numa_event(NUMA_HINT_FAULTS_LOCAL);
+
+ return mpol_misplaced(page, vma, addr);
+}
+
+int do_numa_page(struct mm_struct *mm, struct vm_area_struct *vma,
+ unsigned long addr, pte_t pte, pte_t *ptep, pmd_t *pmd)
+{
+ struct page *page = NULL;
+ spinlock_t *ptl;
+ int current_nid = -1;
+ int target_nid;
+ bool migrated = false;
+
+ /*
+ * The "pte" at this point cannot be used safely without
+ * validation through pte_unmap_same(). It's of NUMA type but
+ * the pfn may be screwed if the read is non atomic.
+ *
+ * ptep_modify_prot_start is not called as this is clearing
+ * the _PAGE_NUMA bit and it is not really expected that there
+ * would be concurrent hardware modifications to the PTE.
+ */
+ ptl = pte_lockptr(mm, pmd);
+ spin_lock(ptl);
+ if (unlikely(!pte_same(*ptep, pte))) {
+ pte_unmap_unlock(ptep, ptl);
+ goto out;
+ }
+
+ pte = pte_mknonnuma(pte);
+ set_pte_at(mm, addr, ptep, pte);
+ update_mmu_cache(vma, addr, ptep);
+
+ page = vm_normal_page(vma, addr, pte);
+ if (!page) {
+ pte_unmap_unlock(ptep, ptl);
+ return 0;
+ }
+
+ current_nid = page_to_nid(page);
+ target_nid = numa_migrate_prep(page, vma, addr, current_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);
+ if (migrated)
+ current_nid = target_nid;
+
+out:
+ if (current_nid != -1)
+ task_numa_fault(current_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;
+ int local_nid = numa_node_id();
+
+ 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 curr_nid = local_nid;
+ int target_nid;
+ bool migrated;
+ 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;
+
+ /*
+ * 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) {
+ 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);
+
+ 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();
+}
+#endif /* CONFIG_NUMA_BALANCING */
+
/*
* These routines also need to handle stuff like marking pages dirty
* and/or accessed for architectures that don't do it in hardware (most
@@ -3450,6 +3631,9 @@ int handle_pte_fault(struct mm_struct *mm,
pte, pmd, flags, entry);
}
+ if (pte_numa(entry))
+ return do_numa_page(mm, vma, address, entry, pte, pmd);
+
ptl = pte_lockptr(mm, pmd);
spin_lock(ptl);
if (unlikely(!pte_same(*pte, entry)))
@@ -3520,8 +3704,11 @@ retry:
if (pmd_trans_huge(orig_pmd)) {
unsigned int dirty = flags & FAULT_FLAG_WRITE;
- if (dirty && !pmd_write(orig_pmd) &&
- !pmd_trans_splitting(orig_pmd)) {
+ if (pmd_numa(orig_pmd))
+ return do_huge_pmd_numa_page(mm, vma, address,
+ orig_pmd, pmd);
+
+ if (dirty && !pmd_write(orig_pmd)) {
ret = do_huge_pmd_wp_page(mm, vma, address, pmd,
orig_pmd);
/*
@@ -3536,16 +3723,21 @@ retry:
huge_pmd_set_accessed(mm, vma, address, pmd,
orig_pmd, dirty);
}
+
return 0;
}
}
+ if (pmd_numa(*pmd))
+ return do_pmd_numa_page(mm, vma, address, pmd);
+
/*
* Use __pte_alloc instead of pte_alloc_map, because we can't
* run pte_offset_map on the pmd, if an huge pmd could
* materialize from under us from a different thread.
*/
- if (unlikely(pmd_none(*pmd)) && __pte_alloc(mm, vma, pmd, address))
+ if (unlikely(pmd_none(*pmd)) &&
+ unlikely(__pte_alloc(mm, vma, pmd, address)))
return VM_FAULT_OOM;
/* if an huge pmd materialized from under us just retry later */
if (unlikely(pmd_trans_huge(*pmd)))
diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c
index 518baa896e8..962e353aa86 100644
--- a/mm/memory_hotplug.c
+++ b/mm/memory_hotplug.c
@@ -1055,7 +1055,8 @@ do_migrate_range(unsigned long start_pfn, unsigned long end_pfn)
* migrate_pages returns # of failed pages.
*/
ret = migrate_pages(&source, alloc_migrate_target, 0,
- true, MIGRATE_SYNC);
+ true, MIGRATE_SYNC,
+ MR_MEMORY_HOTPLUG);
if (ret)
putback_lru_pages(&source);
}
diff --git a/mm/mempolicy.c b/mm/mempolicy.c
index aaf54566cb6..d1b315e9862 100644
--- a/mm/mempolicy.c
+++ b/mm/mempolicy.c
@@ -90,6 +90,7 @@
#include <linux/syscalls.h>
#include <linux/ctype.h>
#include <linux/mm_inline.h>
+#include <linux/mmu_notifier.h>
#include <asm/tlbflush.h>
#include <asm/uaccess.h>
@@ -117,6 +118,26 @@ static struct mempolicy default_policy = {
.flags = MPOL_F_LOCAL,
};
+static struct mempolicy preferred_node_policy[MAX_NUMNODES];
+
+static struct mempolicy *get_task_policy(struct task_struct *p)
+{
+ struct mempolicy *pol = p->mempolicy;
+ int node;
+
+ if (!pol) {
+ node = numa_node_id();
+ if (node != -1)
+ pol = &preferred_node_policy[node];
+
+ /* preferred_node_policy is not initialised early in boot */
+ if (!pol->mode)
+ pol = NULL;
+ }
+
+ return pol;
+}
+
static const struct mempolicy_operations {
int (*create)(struct mempolicy *pol, const nodemask_t *nodes);
/*
@@ -254,7 +275,7 @@ static struct mempolicy *mpol_new(unsigned short mode, unsigned short flags,
if (mode == MPOL_DEFAULT) {
if (nodes && !nodes_empty(*nodes))
return ERR_PTR(-EINVAL);
- return NULL; /* simply delete any existing policy */
+ return NULL;
}
VM_BUG_ON(!nodes);
@@ -269,6 +290,10 @@ static struct mempolicy *mpol_new(unsigned short mode, unsigned short flags,
(flags & MPOL_F_RELATIVE_NODES)))
return ERR_PTR(-EINVAL);
}
+ } else if (mode == MPOL_LOCAL) {
+ if (!nodes_empty(*nodes))
+ return ERR_PTR(-EINVAL);
+ mode = MPOL_PREFERRED;
} else if (nodes_empty(*nodes))
return ERR_PTR(-EINVAL);
policy = kmem_cache_alloc(policy_cache, GFP_KERNEL);
@@ -561,6 +586,36 @@ static inline int check_pgd_range(struct vm_area_struct *vma,
return 0;
}
+#ifdef CONFIG_ARCH_USES_NUMA_PROT_NONE
+/*
+ * This is used to mark a range of virtual addresses to be inaccessible.
+ * These are later cleared by a NUMA hinting fault. Depending on these
+ * faults, pages may be migrated for better NUMA placement.
+ *
+ * This is assuming that NUMA faults are handled using PROT_NONE. If
+ * an architecture makes a different choice, it will need further
+ * changes to the core.
+ */
+unsigned long change_prot_numa(struct vm_area_struct *vma,
+ unsigned long addr, unsigned long end)
+{
+ int nr_updated;
+ BUILD_BUG_ON(_PAGE_NUMA != _PAGE_PROTNONE);
+
+ nr_updated = change_protection(vma, addr, end, vma->vm_page_prot, 0, 1);
+ if (nr_updated)
+ count_vm_numa_events(NUMA_PTE_UPDATES, nr_updated);
+
+ return nr_updated;
+}
+#else
+static unsigned long change_prot_numa(struct vm_area_struct *vma,
+ unsigned long addr, unsigned long end)
+{
+ return 0;
+}
+#endif /* CONFIG_ARCH_USES_NUMA_PROT_NONE */
+
/*
* Check if all pages in a range are on a set of nodes.
* If pagelist != NULL then isolate pages from the LRU and
@@ -579,22 +634,32 @@ check_range(struct mm_struct *mm, unsigned long start, unsigned long end,
return ERR_PTR(-EFAULT);
prev = NULL;
for (vma = first; vma && vma->vm_start < end; vma = vma->vm_next) {
+ unsigned long endvma = vma->vm_end;
+
+ if (endvma > end)
+ endvma = end;
+ if (vma->vm_start > start)
+ start = vma->vm_start;
+
if (!(flags & MPOL_MF_DISCONTIG_OK)) {
if (!vma->vm_next && vma->vm_end < end)
return ERR_PTR(-EFAULT);
if (prev && prev->vm_end < vma->vm_start)
return ERR_PTR(-EFAULT);
}
- if (!is_vm_hugetlb_page(vma) &&
- ((flags & MPOL_MF_STRICT) ||
+
+ if (is_vm_hugetlb_page(vma))
+ goto next;
+
+ if (flags & MPOL_MF_LAZY) {
+ change_prot_numa(vma, start, endvma);
+ goto next;
+ }
+
+ if ((flags & MPOL_MF_STRICT) ||
((flags & (MPOL_MF_MOVE | MPOL_MF_MOVE_ALL)) &&
- vma_migratable(vma)))) {
- unsigned long endvma = vma->vm_end;
+ vma_migratable(vma))) {
- if (endvma > end)
- endvma = end;
- if (vma->vm_start > start)
- start = vma->vm_start;
err = check_pgd_range(vma, start, endvma, nodes,
flags, private);
if (err) {
@@ -602,6 +667,7 @@ check_range(struct mm_struct *mm, unsigned long start, unsigned long end,
break;
}
}
+next:
prev = vma;
}
return first;
@@ -961,7 +1027,8 @@ static int migrate_to_node(struct mm_struct *mm, int source, int dest,
if (!list_empty(&pagelist)) {
err = migrate_pages(&pagelist, new_node_page, dest,
- false, MIGRATE_SYNC);
+ false, MIGRATE_SYNC,
+ MR_SYSCALL);
if (err)
putback_lru_pages(&pagelist);
}
@@ -1133,8 +1200,7 @@ static long do_mbind(unsigned long start, unsigned long len,
int err;
LIST_HEAD(pagelist);
- if (flags & ~(unsigned long)(MPOL_MF_STRICT |
- MPOL_MF_MOVE | MPOL_MF_MOVE_ALL))
+ if (flags & ~(unsigned long)MPOL_MF_VALID)
return -EINVAL;
if ((flags & MPOL_MF_MOVE_ALL) && !capable(CAP_SYS_NICE))
return -EPERM;
@@ -1157,6 +1223,9 @@ static long do_mbind(unsigned long start, unsigned long len,
if (IS_ERR(new))
return PTR_ERR(new);
+ if (flags & MPOL_MF_LAZY)
+ new->flags |= MPOL_F_MOF;
+
/*
* If we are using the default policy then operation
* on discontinuous address spaces is okay after all
@@ -1193,21 +1262,24 @@ static long do_mbind(unsigned long start, unsigned long len,
vma = check_range(mm, start, end, nmask,
flags | MPOL_MF_INVERT, &pagelist);
- err = PTR_ERR(vma);
- if (!IS_ERR(vma)) {
- int nr_failed = 0;
-
+ err = PTR_ERR(vma); /* maybe ... */
+ if (!IS_ERR(vma))
err = mbind_range(mm, start, end, new);
+ if (!err) {
+ int nr_failed = 0;
+
if (!list_empty(&pagelist)) {
+ WARN_ON_ONCE(flags & MPOL_MF_LAZY);
nr_failed = migrate_pages(&pagelist, new_vma_page,
(unsigned long)vma,
- false, MIGRATE_SYNC);
+ false, MIGRATE_SYNC,
+ MR_MEMPOLICY_MBIND);
if (nr_failed)
putback_lru_pages(&pagelist);
}
- if (!err && nr_failed && (flags & MPOL_MF_STRICT))
+ if (nr_failed && (flags & MPOL_MF_STRICT))
err = -EIO;
} else
putback_lru_pages(&pagelist);
@@ -1546,7 +1618,7 @@ asmlinkage long compat_sys_mbind(compat_ulong_t start, compat_ulong_t len,
struct mempolicy *get_vma_policy(struct task_struct *task,
struct vm_area_struct *vma, unsigned long addr)
{
- struct mempolicy *pol = task->mempolicy;
+ struct mempolicy *pol = get_task_policy(task);
if (vma) {
if (vma->vm_ops && vma->vm_ops->get_policy) {
@@ -1956,7 +2028,7 @@ retry_cpuset:
*/
struct page *alloc_pages_current(gfp_t gfp, unsigned order)
{
- struct mempolicy *pol = current->mempolicy;
+ struct mempolicy *pol = get_task_policy(current);
struct page *page;
unsigned int cpuset_mems_cookie;
@@ -2140,6 +2212,115 @@ static void sp_free(struct sp_node *n)
kmem_cache_free(sn_cache, n);
}
+/**
+ * mpol_misplaced - check whether current page node is valid in policy
+ *
+ * @page - page to be checked
+ * @vma - vm area where page mapped
+ * @addr - virtual address where page mapped
+ *
+ * Lookup current policy node id for vma,addr and "compare to" page's
+ * node id.
+ *
+ * Returns:
+ * -1 - not misplaced, page is in the right node
+ * node - node id where the page should be
+ *
+ * Policy determination "mimics" alloc_page_vma().
+ * Called from fault path where we know the vma and faulting address.
+ */
+int mpol_misplaced(struct page *page, struct vm_area_struct *vma, unsigned long addr)
+{
+ struct mempolicy *pol;
+ struct zone *zone;
+ int curnid = page_to_nid(page);
+ unsigned long pgoff;
+ int polnid = -1;
+ int ret = -1;
+
+ BUG_ON(!vma);
+
+ pol = get_vma_policy(current, vma, addr);
+ if (!(pol->flags & MPOL_F_MOF))
+ goto out;
+
+ switch (pol->mode) {
+ case MPOL_INTERLEAVE:
+ BUG_ON(addr >= vma->vm_end);
+ BUG_ON(addr < vma->vm_start);
+
+ pgoff = vma->vm_pgoff;
+ pgoff += (addr - vma->vm_start) >> PAGE_SHIFT;
+ polnid = offset_il_node(pol, vma, pgoff);
+ break;
+
+ case MPOL_PREFERRED:
+ if (pol->flags & MPOL_F_LOCAL)
+ polnid = numa_node_id();
+ else
+ polnid = pol->v.preferred_node;
+ break;
+
+ case MPOL_BIND:
+ /*
+ * allows binding to multiple nodes.
+ * use current page if in policy nodemask,
+ * else select nearest allowed node, if any.
+ * If no allowed nodes, use current [!misplaced].
+ */
+ if (node_isset(curnid, pol->v.nodes))
+ goto out;
+ (void)first_zones_zonelist(
+ node_zonelist(numa_node_id(), GFP_HIGHUSER),
+ gfp_zone(GFP_HIGHUSER),
+ &pol->v.nodes, &zone);
+ polnid = zone->node;
+ break;
+
+ default:
+ BUG();
+ }
+
+ /* Migrate the page towards the node whose CPU is referencing it */
+ if (pol->flags & MPOL_F_MORON) {
+ int last_nid;
+
+ polnid = numa_node_id();
+
+ /*
+ * Multi-stage node selection is used in conjunction
+ * with a periodic migration fault to build a temporal
+ * task<->page relation. By using a two-stage filter we
+ * remove short/unlikely relations.
+ *
+ * Using P(p) ~ n_p / n_t as per frequentist
+ * probability, we can equate a task's usage of a
+ * particular page (n_p) per total usage of this
+ * page (n_t) (in a given time-span) to a probability.
+ *
+ * Our periodic faults will sample this probability and
+ * getting the same result twice in a row, given these
+ * samples are fully independent, is then given by
+ * P(n)^2, provided our sample period is sufficiently
+ * short compared to the usage pattern.
+ *
+ * This quadric squishes small probabilities, making
+ * it less likely we act on an unlikely task<->page
+ * relation.
+ */
+ last_nid = page_xchg_last_nid(page, polnid);
+ if (last_nid != polnid)
+ goto out;
+ }
+
+ if (curnid != polnid)
+ ret = polnid;
+out:
+ mpol_cond_put(pol);
+
+ return ret;
+}
+
static void sp_delete(struct shared_policy *sp, struct sp_node *n)
{
pr_debug("deleting %lx-l%lx\n", n->start, n->end);
@@ -2305,6 +2486,50 @@ void mpol_free_shared_policy(struct shared_policy *p)
mutex_unlock(&p->mutex);
}
+#ifdef CONFIG_NUMA_BALANCING
+static bool __initdata numabalancing_override;
+
+static void __init check_numabalancing_enable(void)
+{
+ bool numabalancing_default = false;
+
+ if (IS_ENABLED(CONFIG_NUMA_BALANCING_DEFAULT_ENABLED))
+ numabalancing_default = true;
+
+ if (nr_node_ids > 1 && !numabalancing_override) {
+ printk(KERN_INFO "Enabling automatic NUMA balancing. "
+ "Configure with numa_balancing= or sysctl");
+ set_numabalancing_state(numabalancing_default);
+ }
+}
+
+static int __init setup_numabalancing(char *str)
+{
+ int ret = 0;
+ if (!str)
+ goto out;
+ numabalancing_override = true;
+
+ if (!strcmp(str, "enable")) {
+ set_numabalancing_state(true);
+ ret = 1;
+ } else if (!strcmp(str, "disable")) {
+ set_numabalancing_state(false);
+ ret = 1;
+ }
+out:
+ if (!ret)
+ printk(KERN_WARNING "Unable to parse numa_balancing=\n");
+
+ return ret;
+}
+__setup("numa_balancing=", setup_numabalancing);
+#else
+static inline void __init check_numabalancing_enable(void)
+{
+}
+#endif /* CONFIG_NUMA_BALANCING */
+
/* assumes fs == KERNEL_DS */
void __init numa_policy_init(void)
{
@@ -2320,6 +2545,15 @@ void __init numa_policy_init(void)
sizeof(struct sp_node),
0, SLAB_PANIC, NULL);
+ for_each_node(nid) {
+ preferred_node_policy[nid] = (struct mempolicy) {
+ .refcnt = ATOMIC_INIT(1),
+ .mode = MPOL_PREFERRED,
+ .flags = MPOL_F_MOF | MPOL_F_MORON,
+ .v = { .preferred_node = nid, },
+ };
+ }
+
/*
* Set interleaving policy for system init. Interleaving is only
* enabled across suitably sized nodes (default is >= 16MB), or
@@ -2346,6 +2580,8 @@ void __init numa_policy_init(void)
if (do_set_mempolicy(MPOL_INTERLEAVE, 0, &interleave_nodes))
printk("numa_policy_init: interleaving failed\n");
+
+ check_numabalancing_enable();
}
/* Reset policy of current process to default */
@@ -2362,14 +2598,13 @@ void numa_default_policy(void)
* "local" is pseudo-policy: MPOL_PREFERRED with MPOL_F_LOCAL flag
* Used only for mpol_parse_str() and mpol_to_str()
*/
-#define MPOL_LOCAL MPOL_MAX
static const char * const policy_modes[] =
{
[MPOL_DEFAULT] = "default",
[MPOL_PREFERRED] = "prefer",
[MPOL_BIND] = "bind",
[MPOL_INTERLEAVE] = "interleave",
- [MPOL_LOCAL] = "local"
+ [MPOL_LOCAL] = "local",
};
@@ -2415,12 +2650,12 @@ int mpol_parse_str(char *str, struct mempolicy **mpol, int no_context)
if (flags)
*flags++ = '\0'; /* terminate mode string */
- for (mode = 0; mode <= MPOL_LOCAL; mode++) {
+ for (mode = 0; mode < MPOL_MAX; mode++) {
if (!strcmp(str, policy_modes[mode])) {
break;
}
}
- if (mode > MPOL_LOCAL)
+ if (mode >= MPOL_MAX)
goto out;
switch (mode) {
diff --git a/mm/migrate.c b/mm/migrate.c
index cae02711181..32efd8028bc 100644
--- a/mm/migrate.c
+++ b/mm/migrate.c
@@ -39,6 +39,9 @@
#include <asm/tlbflush.h>
+#define CREATE_TRACE_POINTS
+#include <trace/events/migrate.h>
+
#include "internal.h"
/*
@@ -293,7 +296,7 @@ static int migrate_page_move_mapping(struct address_space *mapping,
struct page *newpage, struct page *page,
struct buffer_head *head, enum migrate_mode mode)
{
- int expected_count;
+ int expected_count = 0;
void **pslot;
if (!mapping) {
@@ -421,7 +424,7 @@ int migrate_huge_page_move_mapping(struct address_space *mapping,
*/
void migrate_page_copy(struct page *newpage, struct page *page)
{
- if (PageHuge(page))
+ if (PageHuge(page) || PageTransHuge(page))
copy_huge_page(newpage, page);
else
copy_highpage(newpage, page);
@@ -765,7 +768,7 @@ static int __unmap_and_move(struct page *page, struct page *newpage,
*/
if (PageAnon(page)) {
/*
- * Only page_lock_anon_vma() understands the subtleties of
+ * Only page_lock_anon_vma_read() understands the subtleties of
* getting a hold on an anon_vma from outside one of its mms.
*/
anon_vma = page_get_anon_vma(page);
@@ -998,10 +1001,11 @@ out:
*/
int migrate_pages(struct list_head *from,
new_page_t get_new_page, unsigned long private, bool offlining,
- enum migrate_mode mode)
+ enum migrate_mode mode, int reason)
{
int retry = 1;
int nr_failed = 0;
+ int nr_succeeded = 0;
int pass = 0;
struct page *page;
struct page *page2;
@@ -1028,6 +1032,7 @@ int migrate_pages(struct list_head *from,
retry++;
break;
case MIGRATEPAGE_SUCCESS:
+ nr_succeeded++;
break;
default:
/* Permanent failure */
@@ -1038,6 +1043,12 @@ int migrate_pages(struct list_head *from,
}
rc = nr_failed + retry;
out:
+ if (nr_succeeded)
+ count_vm_events(PGMIGRATE_SUCCESS, nr_succeeded);
+ if (nr_failed)
+ count_vm_events(PGMIGRATE_FAIL, nr_failed);
+ trace_mm_migrate_pages(nr_succeeded, nr_failed, mode, reason);
+
if (!swapwrite)
current->flags &= ~PF_SWAPWRITE;
@@ -1176,7 +1187,8 @@ set_status:
err = 0;
if (!list_empty(&pagelist)) {
err = migrate_pages(&pagelist, new_page_node,
- (unsigned long)pm, 0, MIGRATE_SYNC);
+ (unsigned long)pm, 0, MIGRATE_SYNC,
+ MR_SYSCALL);
if (err)
putback_lru_pages(&pagelist);
}
@@ -1440,4 +1452,317 @@ int migrate_vmas(struct mm_struct *mm, const nodemask_t *to,
}
return err;
}
-#endif
+
+#ifdef CONFIG_NUMA_BALANCING
+/*
+ * Returns true if this is a safe migration target node for misplaced NUMA
+ * pages. Currently it only checks the watermarks which crude
+ */
+static bool migrate_balanced_pgdat(struct pglist_data *pgdat,
+ int nr_migrate_pages)
+{
+ int z;
+ for (z = pgdat->nr_zones - 1; z >= 0; z--) {
+ struct zone *zone = pgdat->node_zones + z;
+
+ if (!populated_zone(zone))
+ continue;
+
+ if (zone->all_unreclaimable)
+ continue;
+
+ /* Avoid waking kswapd by allocating pages_to_migrate pages. */
+ if (!zone_watermark_ok(zone, 0,
+ high_wmark_pages(zone) +
+ nr_migrate_pages,
+ 0, 0))
+ continue;
+ return true;
+ }
+ return false;
+}
+
+static struct page *alloc_misplaced_dst_page(struct page *page,
+ unsigned long data,
+ int **result)
+{
+ int nid = (int) data;
+ struct page *newpage;
+
+ newpage = alloc_pages_exact_node(nid,
+ (GFP_HIGHUSER_MOVABLE | GFP_THISNODE |
+ __GFP_NOMEMALLOC | __GFP_NORETRY |
+ __GFP_NOWARN) &
+ ~GFP_IOFS, 0);
+ if (newpage)
+ page_xchg_last_nid(newpage, page_last_nid(page));
+
+ return newpage;
+}
+
+/*
+ * page migration rate limiting control.
+ * Do not migrate more than @pages_to_migrate in a @migrate_interval_millisecs
+ * window of time. Default here says do not migrate more than 1280M per second.
+ * If a node is rate-limited then PTE NUMA updates are also rate-limited. However
+ * as it is faults that reset the window, pte updates will happen unconditionally
+ * if there has not been a fault since @pteupdate_interval_millisecs after the
+ * throttle window closed.
+ */
+static unsigned int migrate_interval_millisecs __read_mostly = 100;
+static unsigned int pteupdate_interval_millisecs __read_mostly = 1000;
+static unsigned int ratelimit_pages __read_mostly = 128 << (20 - PAGE_SHIFT);
+
+/* Returns true if NUMA migration is currently rate limited */
+bool migrate_ratelimited(int node)
+{
+ pg_data_t *pgdat = NODE_DATA(node);
+
+ if (time_after(jiffies, pgdat->numabalancing_migrate_next_window +
+ msecs_to_jiffies(pteupdate_interval_millisecs)))
+ return false;
+
+ if (pgdat->numabalancing_migrate_nr_pages < ratelimit_pages)
+ return false;
+
+ return true;
+}
+
+/* Returns true if the node is migrate rate-limited after the update */
+bool numamigrate_update_ratelimit(pg_data_t *pgdat, unsigned long nr_pages)
+{
+ bool rate_limited = false;
+
+ /*
+ * Rate-limit the amount of data that is being migrated to a node.
+ * Optimal placement is no good if the memory bus is saturated and
+ * all the time is being spent migrating!
+ */
+ spin_lock(&pgdat->numabalancing_migrate_lock);
+ if (time_after(jiffies, pgdat->numabalancing_migrate_next_window)) {
+ pgdat->numabalancing_migrate_nr_pages = 0;
+ pgdat->numabalancing_migrate_next_window = jiffies +
+ msecs_to_jiffies(migrate_interval_millisecs);
+ }
+ if (pgdat->numabalancing_migrate_nr_pages > ratelimit_pages)
+ rate_limited = true;
+ else
+ pgdat->numabalancing_migrate_nr_pages += nr_pages;
+ spin_unlock(&pgdat->numabalancing_migrate_lock);
+
+ return rate_limited;
+}
+
+int numamigrate_isolate_page(pg_data_t *pgdat, struct page *page)
+{
+ int ret = 0;
+
+ /* Avoid migrating to a node that is nearly full */
+ if (migrate_balanced_pgdat(pgdat, 1)) {
+ int page_lru;
+
+ if (isolate_lru_page(page)) {
+ put_page(page);
+ return 0;
+ }
+
+ /* Page is isolated */
+ ret = 1;
+ page_lru = page_is_file_cache(page);
+ if (!PageTransHuge(page))
+ inc_zone_page_state(page, NR_ISOLATED_ANON + page_lru);
+ else
+ mod_zone_page_state(page_zone(page),
+ NR_ISOLATED_ANON + page_lru,
+ HPAGE_PMD_NR);
+ }
+
+ /*
+ * Page is either isolated or there is not enough space on the target
+ * node. If isolated, then it has taken a reference count and the
+ * callers reference can be safely dropped without the page
+ * disappearing underneath us during migration. Otherwise the page is
+ * not to be migrated but the callers reference should still be
+ * dropped so it does not leak.
+ */
+ put_page(page);
+
+ return ret;
+}
+
+/*
+ * Attempt to migrate a misplaced page to the specified destination
+ * node. Caller is expected to have an elevated reference count on
+ * the page that will be dropped by this function before returning.
+ */
+int migrate_misplaced_page(struct page *page, int node)
+{
+ pg_data_t *pgdat = NODE_DATA(node);
+ int isolated = 0;
+ int nr_remaining;
+ LIST_HEAD(migratepages);
+
+ /*
+ * Don't migrate pages that are mapped in multiple processes.
+ * TODO: Handle false sharing detection instead of this hammer
+ */
+ if (page_mapcount(page) != 1) {
+ put_page(page);
+ goto out;
+ }
+
+ /*
+ * Rate-limit the amount of data that is being migrated to a node.
+ * Optimal placement is no good if the memory bus is saturated and
+ * all the time is being spent migrating!
+ */
+ if (numamigrate_update_ratelimit(pgdat, 1)) {
+ put_page(page);
+ goto out;
+ }
+
+ isolated = numamigrate_isolate_page(pgdat, page);
+ if (!isolated)
+ goto out;
+
+ list_add(&page->lru, &migratepages);
+ nr_remaining = migrate_pages(&migratepages,
+ alloc_misplaced_dst_page,
+ node, false, MIGRATE_ASYNC,
+ MR_NUMA_MISPLACED);
+ if (nr_remaining) {
+ putback_lru_pages(&migratepages);
+ isolated = 0;
+ } else
+ count_vm_numa_event(NUMA_PAGE_MIGRATE);
+ BUG_ON(!list_empty(&migratepages));
+out:
+ return isolated;
+}
+#endif /* CONFIG_NUMA_BALANCING */
+
+#if defined(CONFIG_NUMA_BALANCING) && defined(CONFIG_TRANSPARENT_HUGEPAGE)
+int migrate_misplaced_transhuge_page(struct mm_struct *mm,
+ struct vm_area_struct *vma,
+ pmd_t *pmd, pmd_t entry,
+ unsigned long address,
+ struct page *page, int node)
+{
+ unsigned long haddr = address & HPAGE_PMD_MASK;
+ pg_data_t *pgdat = NODE_DATA(node);
+ int isolated = 0;
+ struct page *new_page = NULL;
+ struct mem_cgroup *memcg = NULL;
+ int page_lru = page_is_file_cache(page);
+
+ /*
+ * Don't migrate pages that are mapped in multiple processes.
+ * TODO: Handle false sharing detection instead of this hammer
+ */
+ if (page_mapcount(page) != 1)
+ goto out_dropref;
+
+ /*
+ * Rate-limit the amount of data that is being migrated to a node.
+ * Optimal placement is no good if the memory bus is saturated and
+ * all the time is being spent migrating!
+ */
+ if (numamigrate_update_ratelimit(pgdat, HPAGE_PMD_NR))
+ goto out_dropref;
+
+ new_page = alloc_pages_node(node,
+ (GFP_TRANSHUGE | GFP_THISNODE) & ~__GFP_WAIT, HPAGE_PMD_ORDER);
+ if (!new_page) {
+ count_vm_events(PGMIGRATE_FAIL, HPAGE_PMD_NR);
+ goto out_dropref;
+ }
+ page_xchg_last_nid(new_page, page_last_nid(page));
+
+ isolated = numamigrate_isolate_page(pgdat, page);
+ if (!isolated) {
+ count_vm_events(PGMIGRATE_FAIL, HPAGE_PMD_NR);
+ put_page(new_page);
+ goto out_keep_locked;
+ }
+
+ /* Prepare a page as a migration target */
+ __set_page_locked(new_page);
+ SetPageSwapBacked(new_page);
+
+ /* anon mapping, we can simply copy page->mapping to the new page: */
+ new_page->mapping = page->mapping;
+ new_page->index = page->index;
+ migrate_page_copy(new_page, page);
+ WARN_ON(PageLRU(new_page));
+
+ /* Recheck the target PMD */
+ spin_lock(&mm->page_table_lock);
+ if (unlikely(!pmd_same(*pmd, entry))) {
+ spin_unlock(&mm->page_table_lock);
+
+ /* Reverse changes made by migrate_page_copy() */
+ if (TestClearPageActive(new_page))
+ SetPageActive(page);
+ if (TestClearPageUnevictable(new_page))
+ SetPageUnevictable(page);
+ mlock_migrate_page(page, new_page);
+
+ unlock_page(new_page);
+ put_page(new_page); /* Free it */
+
+ unlock_page(page);
+ putback_lru_page(page);
+
+ count_vm_events(PGMIGRATE_FAIL, HPAGE_PMD_NR);
+ goto out;
+ }
+
+ /*
+ * Traditional migration needs to prepare the memcg charge
+ * transaction early to prevent the old page from being
+ * uncharged when installing migration entries. Here we can
+ * save the potential rollback and start the charge transfer
+ * only when migration is already known to end successfully.
+ */
+ mem_cgroup_prepare_migration(page, new_page, &memcg);
+
+ entry = mk_pmd(new_page, vma->vm_page_prot);
+ entry = pmd_mknonnuma(entry);
+ entry = maybe_pmd_mkwrite(pmd_mkdirty(entry), vma);
+ entry = pmd_mkhuge(entry);
+
+ page_add_new_anon_rmap(new_page, vma, haddr);
+
+ set_pmd_at(mm, haddr, pmd, entry);
+ update_mmu_cache_pmd(vma, address, entry);
+ page_remove_rmap(page);
+ /*
+ * Finish the charge transaction under the page table lock to
+ * prevent split_huge_page() from dividing up the charge
+ * before it's fully transferred to the new page.
+ */
+ mem_cgroup_end_migration(memcg, page, new_page, true);
+ spin_unlock(&mm->page_table_lock);
+
+ unlock_page(new_page);
+ unlock_page(page);
+ put_page(page); /* Drop the rmap reference */
+ put_page(page); /* Drop the LRU isolation reference */
+
+ count_vm_events(PGMIGRATE_SUCCESS, HPAGE_PMD_NR);
+ count_vm_numa_events(NUMA_PAGE_MIGRATE, HPAGE_PMD_NR);
+
+out:
+ mod_zone_page_state(page_zone(page),
+ NR_ISOLATED_ANON + page_lru,
+ -HPAGE_PMD_NR);
+ return isolated;
+
+out_dropref:
+ put_page(page);
+out_keep_locked:
+ return 0;
+}
+#endif /* CONFIG_NUMA_BALANCING */
+
+#endif /* CONFIG_NUMA */
diff --git a/mm/mmap.c b/mm/mmap.c
index 2b7d9e78a56..f54b235f29a 100644
--- a/mm/mmap.c
+++ b/mm/mmap.c
@@ -736,7 +736,7 @@ again: remove_next = 1 + (end > next->vm_end);
if (anon_vma) {
VM_BUG_ON(adjust_next && next->anon_vma &&
anon_vma != next->anon_vma);
- anon_vma_lock(anon_vma);
+ anon_vma_lock_write(anon_vma);
anon_vma_interval_tree_pre_update_vma(vma);
if (adjust_next)
anon_vma_interval_tree_pre_update_vma(next);
@@ -2886,15 +2886,15 @@ static void vm_lock_anon_vma(struct mm_struct *mm, struct anon_vma *anon_vma)
* The LSB of head.next can't change from under us
* because we hold the mm_all_locks_mutex.
*/
- mutex_lock_nest_lock(&anon_vma->root->mutex, &mm->mmap_sem);
+ down_write(&anon_vma->root->rwsem);
/*
* We can safely modify head.next after taking the
- * anon_vma->root->mutex. If some other vma in this mm shares
+ * anon_vma->root->rwsem. If some other vma in this mm shares
* the same anon_vma we won't take it again.
*
* No need of atomic instructions here, head.next
* can't change from under us thanks to the
- * anon_vma->root->mutex.
+ * anon_vma->root->rwsem.
*/
if (__test_and_set_bit(0, (unsigned long *)
&anon_vma->root->rb_root.rb_node))
@@ -2996,7 +2996,7 @@ static void vm_unlock_anon_vma(struct anon_vma *anon_vma)
*
* No need of atomic instructions here, head.next
* can't change from under us until we release the
- * anon_vma->root->mutex.
+ * anon_vma->root->rwsem.
*/
if (!__test_and_clear_bit(0, (unsigned long *)
&anon_vma->root->rb_root.rb_node))
diff --git a/mm/mprotect.c b/mm/mprotect.c
index e8c3938db6f..3dca970367d 100644
--- a/mm/mprotect.c
+++ b/mm/mprotect.c
@@ -35,12 +35,16 @@ static inline pgprot_t pgprot_modify(pgprot_t oldprot, pgprot_t newprot)
}
#endif
-static void change_pte_range(struct mm_struct *mm, pmd_t *pmd,
+static unsigned long change_pte_range(struct vm_area_struct *vma, pmd_t *pmd,
unsigned long addr, unsigned long end, pgprot_t newprot,
- int dirty_accountable)
+ int dirty_accountable, int prot_numa, bool *ret_all_same_node)
{
+ struct mm_struct *mm = vma->vm_mm;
pte_t *pte, oldpte;
spinlock_t *ptl;
+ unsigned long pages = 0;
+ bool all_same_node = true;
+ int last_nid = -1;
pte = pte_offset_map_lock(mm, pmd, addr, &ptl);
arch_enter_lazy_mmu_mode();
@@ -48,17 +52,43 @@ static void change_pte_range(struct mm_struct *mm, pmd_t *pmd,
oldpte = *pte;
if (pte_present(oldpte)) {
pte_t ptent;
+ bool updated = false;
ptent = ptep_modify_prot_start(mm, addr, pte);
- ptent = pte_modify(ptent, newprot);
+ if (!prot_numa) {
+ ptent = pte_modify(ptent, newprot);
+ updated = true;
+ } else {
+ struct page *page;
+
+ page = vm_normal_page(vma, addr, oldpte);
+ if (page) {
+ int this_nid = page_to_nid(page);
+ if (last_nid == -1)
+ last_nid = this_nid;
+ if (last_nid != this_nid)
+ all_same_node = false;
+
+ /* only check non-shared pages */
+ if (!pte_numa(oldpte) &&
+ page_mapcount(page) == 1) {
+ ptent = pte_mknuma(ptent);
+ updated = true;
+ }
+ }
+ }
/*
* Avoid taking write faults for pages we know to be
* dirty.
*/
- if (dirty_accountable && pte_dirty(ptent))
+ if (dirty_accountable && pte_dirty(ptent)) {
ptent = pte_mkwrite(ptent);
+ updated = true;
+ }
+ if (updated)
+ pages++;
ptep_modify_prot_commit(mm, addr, pte, ptent);
} else if (IS_ENABLED(CONFIG_MIGRATION) && !pte_file(oldpte)) {
swp_entry_t entry = pte_to_swp_entry(oldpte);
@@ -72,18 +102,40 @@ static void change_pte_range(struct mm_struct *mm, pmd_t *pmd,
set_pte_at(mm, addr, pte,
swp_entry_to_pte(entry));
}
+ pages++;
}
} while (pte++, addr += PAGE_SIZE, addr != end);
arch_leave_lazy_mmu_mode();
pte_unmap_unlock(pte - 1, ptl);
+
+ *ret_all_same_node = all_same_node;
+ return pages;
+}
+
+#ifdef CONFIG_NUMA_BALANCING
+static inline void change_pmd_protnuma(struct mm_struct *mm, unsigned long addr,
+ pmd_t *pmd)
+{
+ spin_lock(&mm->page_table_lock);
+ set_pmd_at(mm, addr & PMD_MASK, pmd, pmd_mknuma(*pmd));
+ spin_unlock(&mm->page_table_lock);
+}
+#else
+static inline void change_pmd_protnuma(struct mm_struct *mm, unsigned long addr,
+ pmd_t *pmd)
+{
+ BUG();
}
+#endif /* CONFIG_NUMA_BALANCING */
-static inline void change_pmd_range(struct vm_area_struct *vma, pud_t *pud,
+static inline unsigned long change_pmd_range(struct vm_area_struct *vma, pud_t *pud,
unsigned long addr, unsigned long end, pgprot_t newprot,
- int dirty_accountable)
+ int dirty_accountable, int prot_numa)
{
pmd_t *pmd;
unsigned long next;
+ unsigned long pages = 0;
+ bool all_same_node;
pmd = pmd_offset(pud, addr);
do {
@@ -91,42 +143,59 @@ static inline void change_pmd_range(struct vm_area_struct *vma, pud_t *pud,
if (pmd_trans_huge(*pmd)) {
if (next - addr != HPAGE_PMD_SIZE)
split_huge_page_pmd(vma, addr, pmd);
- else if (change_huge_pmd(vma, pmd, addr, newprot))
+ else if (change_huge_pmd(vma, pmd, addr, newprot, prot_numa)) {
+ pages += HPAGE_PMD_NR;
continue;
+ }
/* fall through */
}
if (pmd_none_or_clear_bad(pmd))
continue;
- change_pte_range(vma->vm_mm, pmd, addr, next, newprot,
- dirty_accountable);
+ pages += change_pte_range(vma, pmd, addr, next, newprot,
+ dirty_accountable, prot_numa, &all_same_node);
+
+ /*
+ * If we are changing protections for NUMA hinting faults then
+ * set pmd_numa if the examined pages were all on the same
+ * node. This allows a regular PMD to be handled as one fault
+ * and effectively batches the taking of the PTL
+ */
+ if (prot_numa && all_same_node)
+ change_pmd_protnuma(vma->vm_mm, addr, pmd);
} while (pmd++, addr = next, addr != end);
+
+ return pages;
}
-static inline void change_pud_range(struct vm_area_struct *vma, pgd_t *pgd,
+static inline unsigned long change_pud_range(struct vm_area_struct *vma, pgd_t *pgd,
unsigned long addr, unsigned long end, pgprot_t newprot,
- int dirty_accountable)
+ int dirty_accountable, int prot_numa)
{
pud_t *pud;
unsigned long next;
+ unsigned long pages = 0;
pud = pud_offset(pgd, addr);
do {
next = pud_addr_end(addr, end);
if (pud_none_or_clear_bad(pud))
continue;
- change_pmd_range(vma, pud, addr, next, newprot,
- dirty_accountable);
+ pages += change_pmd_range(vma, pud, addr, next, newprot,
+ dirty_accountable, prot_numa);
} while (pud++, addr = next, addr != end);
+
+ return pages;
}
-static void change_protection(struct vm_area_struct *vma,
+static unsigned long change_protection_range(struct vm_area_struct *vma,
unsigned long addr, unsigned long end, pgprot_t newprot,
- int dirty_accountable)
+ int dirty_accountable, int prot_numa)
{
struct mm_struct *mm = vma->vm_mm;
pgd_t *pgd;
unsigned long next;
unsigned long start = addr;
+ unsigned long pages = 0;
BUG_ON(addr >= end);
pgd = pgd_offset(mm, addr);
@@ -135,10 +204,32 @@ static void change_protection(struct vm_area_struct *vma,
next = pgd_addr_end(addr, end);
if (pgd_none_or_clear_bad(pgd))
continue;
- change_pud_range(vma, pgd, addr, next, newprot,
- dirty_accountable);
+ pages += change_pud_range(vma, pgd, addr, next, newprot,
+ dirty_accountable, prot_numa);
} while (pgd++, addr = next, addr != end);
- flush_tlb_range(vma, start, end);
+
+ /* Only flush the TLB if we actually modified any entries: */
+ if (pages)
+ flush_tlb_range(vma, start, end);
+
+ return pages;
+}
+
+unsigned long change_protection(struct vm_area_struct *vma, unsigned long start,
+ unsigned long end, pgprot_t newprot,
+ int dirty_accountable, int prot_numa)
+{
+ struct mm_struct *mm = vma->vm_mm;
+ unsigned long pages;
+
+ mmu_notifier_invalidate_range_start(mm, start, end);
+ if (is_vm_hugetlb_page(vma))
+ pages = hugetlb_change_protection(vma, start, end, newprot);
+ else
+ pages = change_protection_range(vma, start, end, newprot, dirty_accountable, prot_numa);
+ mmu_notifier_invalidate_range_end(mm, start, end);
+
+ return pages;
}
int
@@ -213,12 +304,8 @@ success:
dirty_accountable = 1;
}
- mmu_notifier_invalidate_range_start(mm, start, end);
- if (is_vm_hugetlb_page(vma))
- hugetlb_change_protection(vma, start, end, vma->vm_page_prot);
- else
- change_protection(vma, start, end, vma->vm_page_prot, dirty_accountable);
- mmu_notifier_invalidate_range_end(mm, start, end);
+ change_protection(vma, start, end, vma->vm_page_prot, dirty_accountable, 0);
+
vm_stat_account(mm, oldflags, vma->vm_file, -nrpages);
vm_stat_account(mm, newflags, vma->vm_file, nrpages);
perf_event_mmap(vma);
diff --git a/mm/mremap.c b/mm/mremap.c
index eabb24da6c9..e1031e1f6a6 100644
--- a/mm/mremap.c
+++ b/mm/mremap.c
@@ -104,7 +104,7 @@ static void move_ptes(struct vm_area_struct *vma, pmd_t *old_pmd,
}
if (vma->anon_vma) {
anon_vma = vma->anon_vma;
- anon_vma_lock(anon_vma);
+ anon_vma_lock_write(anon_vma);
}
}
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 83637dfba11..d037c8bc151 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -611,6 +611,7 @@ static inline int free_pages_check(struct page *page)
bad_page(page);
return 1;
}
+ reset_page_last_nid(page);
if (page->flags & PAGE_FLAGS_CHECK_AT_PREP)
page->flags &= ~PAGE_FLAGS_CHECK_AT_PREP;
return 0;
@@ -3883,6 +3884,7 @@ void __meminit memmap_init_zone(unsigned long size, int nid, unsigned long zone,
mminit_verify_page_links(page, zone, nid, pfn);
init_page_count(page);
reset_page_mapcount(page);
+ reset_page_last_nid(page);
SetPageReserved(page);
/*
* Mark the block movable so that blocks are reserved for
@@ -4526,6 +4528,11 @@ static void __paginginit free_area_init_core(struct pglist_data *pgdat,
int ret;
pgdat_resize_init(pgdat);
+#ifdef CONFIG_NUMA_BALANCING
+ spin_lock_init(&pgdat->numabalancing_migrate_lock);
+ pgdat->numabalancing_migrate_nr_pages = 0;
+ pgdat->numabalancing_migrate_next_window = jiffies;
+#endif
init_waitqueue_head(&pgdat->kswapd_wait);
init_waitqueue_head(&pgdat->pfmemalloc_wait);
pgdat_page_cgroup_init(pgdat);
@@ -5800,7 +5807,8 @@ static int __alloc_contig_migrate_range(struct compact_control *cc,
ret = migrate_pages(&cc->migratepages,
alloc_migrate_target,
- 0, false, MIGRATE_SYNC);
+ 0, false, MIGRATE_SYNC,
+ MR_CMA);
}
putback_movable_pages(&cc->migratepages);
diff --git a/mm/pgtable-generic.c b/mm/pgtable-generic.c
index e642627da6b..0c8323fe6c8 100644
--- a/mm/pgtable-generic.c
+++ b/mm/pgtable-generic.c
@@ -12,8 +12,8 @@
#ifndef __HAVE_ARCH_PTEP_SET_ACCESS_FLAGS
/*
- * Only sets the access flags (dirty, accessed, and
- * writable). Furthermore, we know it always gets set to a "more
+ * Only sets the access flags (dirty, accessed), as well as write
+ * permission. Furthermore, we know it always gets set to a "more
* permissive" setting, which allows most architectures to optimize
* this. We return whether the PTE actually changed, which in turn
* instructs the caller to do things like update__mmu_cache. This
@@ -27,7 +27,7 @@ int ptep_set_access_flags(struct vm_area_struct *vma,
int changed = !pte_same(*ptep, entry);
if (changed) {
set_pte_at(vma->vm_mm, address, ptep, entry);
- flush_tlb_page(vma, address);
+ flush_tlb_fix_spurious_fault(vma, address);
}
return changed;
}
@@ -88,7 +88,8 @@ pte_t ptep_clear_flush(struct vm_area_struct *vma, unsigned long address,
{
pte_t pte;
pte = ptep_get_and_clear((vma)->vm_mm, address, ptep);
- flush_tlb_page(vma, address);
+ if (pte_accessible(pte))
+ flush_tlb_page(vma, address);
return pte;
}
#endif
diff --git a/mm/rmap.c b/mm/rmap.c
index face808a489..2c78f8cadc9 100644
--- a/mm/rmap.c
+++ b/mm/rmap.c
@@ -24,7 +24,7 @@
* mm->mmap_sem
* page->flags PG_locked (lock_page)
* mapping->i_mmap_mutex
- * anon_vma->mutex
+ * anon_vma->rwsem
* mm->page_table_lock or pte_lock
* zone->lru_lock (in mark_page_accessed, isolate_lru_page)
* swap_lock (in swap_duplicate, swap_info_get)
@@ -37,7 +37,7 @@
* in arch-dependent flush_dcache_mmap_lock,
* within bdi.wb->list_lock in __sync_single_inode)
*
- * anon_vma->mutex,mapping->i_mutex (memory_failure, collect_procs_anon)
+ * anon_vma->rwsem,mapping->i_mutex (memory_failure, collect_procs_anon)
* ->tasklist_lock
* pte map lock
*/
@@ -87,24 +87,24 @@ static inline void anon_vma_free(struct anon_vma *anon_vma)
VM_BUG_ON(atomic_read(&anon_vma->refcount));
/*
- * Synchronize against page_lock_anon_vma() such that
+ * Synchronize against page_lock_anon_vma_read() such that
* we can safely hold the lock without the anon_vma getting
* freed.
*
* Relies on the full mb implied by the atomic_dec_and_test() from
* put_anon_vma() against the acquire barrier implied by
- * mutex_trylock() from page_lock_anon_vma(). This orders:
+ * down_read_trylock() from page_lock_anon_vma_read(). This orders:
*
- * page_lock_anon_vma() VS put_anon_vma()
- * mutex_trylock() atomic_dec_and_test()
+ * page_lock_anon_vma_read() VS put_anon_vma()
+ * down_read_trylock() atomic_dec_and_test()
* LOCK MB
- * atomic_read() mutex_is_locked()
+ * atomic_read() rwsem_is_locked()
*
* LOCK should suffice since the actual taking of the lock must
* happen _before_ what follows.
*/
- if (mutex_is_locked(&anon_vma->root->mutex)) {
- anon_vma_lock(anon_vma);
+ if (rwsem_is_locked(&anon_vma->root->rwsem)) {
+ anon_vma_lock_write(anon_vma);
anon_vma_unlock(anon_vma);
}
@@ -146,7 +146,7 @@ static void anon_vma_chain_link(struct vm_area_struct *vma,
* allocate a new one.
*
* Anon-vma allocations are very subtle, because we may have
- * optimistically looked up an anon_vma in page_lock_anon_vma()
+ * optimistically looked up an anon_vma in page_lock_anon_vma_read()
* and that may actually touch the spinlock even in the newly
* allocated vma (it depends on RCU to make sure that the
* anon_vma isn't actually destroyed).
@@ -181,7 +181,7 @@ int anon_vma_prepare(struct vm_area_struct *vma)
allocated = anon_vma;
}
- anon_vma_lock(anon_vma);
+ anon_vma_lock_write(anon_vma);
/* page_table_lock to protect against threads */
spin_lock(&mm->page_table_lock);
if (likely(!vma->anon_vma)) {
@@ -219,9 +219,9 @@ static inline struct anon_vma *lock_anon_vma_root(struct anon_vma *root, struct
struct anon_vma *new_root = anon_vma->root;
if (new_root != root) {
if (WARN_ON_ONCE(root))
- mutex_unlock(&root->mutex);
+ up_write(&root->rwsem);
root = new_root;
- mutex_lock(&root->mutex);
+ down_write(&root->rwsem);
}
return root;
}
@@ -229,7 +229,7 @@ static inline struct anon_vma *lock_anon_vma_root(struct anon_vma *root, struct
static inline void unlock_anon_vma_root(struct anon_vma *root)
{
if (root)
- mutex_unlock(&root->mutex);
+ up_write(&root->rwsem);
}
/*
@@ -306,7 +306,7 @@ int anon_vma_fork(struct vm_area_struct *vma, struct vm_area_struct *pvma)
get_anon_vma(anon_vma->root);
/* Mark this anon_vma as the one where our new (COWed) pages go. */
vma->anon_vma = anon_vma;
- anon_vma_lock(anon_vma);
+ anon_vma_lock_write(anon_vma);
anon_vma_chain_link(vma, avc, anon_vma);
anon_vma_unlock(anon_vma);
@@ -349,7 +349,7 @@ void unlink_anon_vmas(struct vm_area_struct *vma)
/*
* Iterate the list once more, it now only contains empty and unlinked
* anon_vmas, destroy them. Could not do before due to __put_anon_vma()
- * needing to acquire the anon_vma->root->mutex.
+ * needing to write-acquire the anon_vma->root->rwsem.
*/
list_for_each_entry_safe(avc, next, &vma->anon_vma_chain, same_vma) {
struct anon_vma *anon_vma = avc->anon_vma;
@@ -365,7 +365,7 @@ static void anon_vma_ctor(void *data)
{
struct anon_vma *anon_vma = data;
- mutex_init(&anon_vma->mutex);
+ init_rwsem(&anon_vma->rwsem);
atomic_set(&anon_vma->refcount, 0);
anon_vma->rb_root = RB_ROOT;
}
@@ -442,7 +442,7 @@ out:
* atomic op -- the trylock. If we fail the trylock, we fall back to getting a
* reference like with page_get_anon_vma() and then block on the mutex.
*/
-struct anon_vma *page_lock_anon_vma(struct page *page)
+struct anon_vma *page_lock_anon_vma_read(struct page *page)
{
struct anon_vma *anon_vma = NULL;
struct anon_vma *root_anon_vma;
@@ -457,14 +457,14 @@ struct anon_vma *page_lock_anon_vma(struct page *page)
anon_vma = (struct anon_vma *) (anon_mapping - PAGE_MAPPING_ANON);
root_anon_vma = ACCESS_ONCE(anon_vma->root);
- if (mutex_trylock(&root_anon_vma->mutex)) {
+ if (down_read_trylock(&root_anon_vma->rwsem)) {
/*
* If the page is still mapped, then this anon_vma is still
* its anon_vma, and holding the mutex ensures that it will
* not go away, see anon_vma_free().
*/
if (!page_mapped(page)) {
- mutex_unlock(&root_anon_vma->mutex);
+ up_read(&root_anon_vma->rwsem);
anon_vma = NULL;
}
goto out;
@@ -484,15 +484,15 @@ struct anon_vma *page_lock_anon_vma(struct page *page)
/* we pinned the anon_vma, its safe to sleep */
rcu_read_unlock();
- anon_vma_lock(anon_vma);
+ anon_vma_lock_read(anon_vma);
if (atomic_dec_and_test(&anon_vma->refcount)) {
/*
* Oops, we held the last refcount, release the lock
* and bail -- can't simply use put_anon_vma() because
- * we'll deadlock on the anon_vma_lock() recursion.
+ * we'll deadlock on the anon_vma_lock_write() recursion.
*/
- anon_vma_unlock(anon_vma);
+ anon_vma_unlock_read(anon_vma);
__put_anon_vma(anon_vma);
anon_vma = NULL;
}
@@ -504,9 +504,9 @@ out:
return anon_vma;
}
-void page_unlock_anon_vma(struct anon_vma *anon_vma)
+void page_unlock_anon_vma_read(struct anon_vma *anon_vma)
{
- anon_vma_unlock(anon_vma);
+ anon_vma_unlock_read(anon_vma);
}
/*
@@ -744,7 +744,7 @@ static int page_referenced_anon(struct page *page,
struct anon_vma_chain *avc;
int referenced = 0;
- anon_vma = page_lock_anon_vma(page);
+ anon_vma = page_lock_anon_vma_read(page);
if (!anon_vma)
return referenced;
@@ -766,7 +766,7 @@ static int page_referenced_anon(struct page *page,
break;
}
- page_unlock_anon_vma(anon_vma);
+ page_unlock_anon_vma_read(anon_vma);
return referenced;
}
@@ -1315,7 +1315,7 @@ out_mlock:
/*
* We need mmap_sem locking, Otherwise VM_LOCKED check makes
* unstable result and race. Plus, We can't wait here because
- * we now hold anon_vma->mutex or mapping->i_mmap_mutex.
+ * we now hold anon_vma->rwsem or mapping->i_mmap_mutex.
* if trylock failed, the page remain in evictable lru and later
* vmscan could retry to move the page to unevictable lru if the
* page is actually mlocked.
@@ -1480,7 +1480,7 @@ static int try_to_unmap_anon(struct page *page, enum ttu_flags flags)
struct anon_vma_chain *avc;
int ret = SWAP_AGAIN;
- anon_vma = page_lock_anon_vma(page);
+ anon_vma = page_lock_anon_vma_read(page);
if (!anon_vma)
return ret;
@@ -1507,7 +1507,7 @@ static int try_to_unmap_anon(struct page *page, enum ttu_flags flags)
break;
}
- page_unlock_anon_vma(anon_vma);
+ page_unlock_anon_vma_read(anon_vma);
return ret;
}
@@ -1702,7 +1702,7 @@ static int rmap_walk_anon(struct page *page, int (*rmap_one)(struct page *,
int ret = SWAP_AGAIN;
/*
- * Note: remove_migration_ptes() cannot use page_lock_anon_vma()
+ * Note: remove_migration_ptes() cannot use page_lock_anon_vma_read()
* because that depends on page_mapped(); but not all its usages
* are holding mmap_sem. Users without mmap_sem are required to
* take a reference count to prevent the anon_vma disappearing
@@ -1710,7 +1710,7 @@ static int rmap_walk_anon(struct page *page, int (*rmap_one)(struct page *,
anon_vma = page_anon_vma(page);
if (!anon_vma)
return ret;
- anon_vma_lock(anon_vma);
+ anon_vma_lock_read(anon_vma);
anon_vma_interval_tree_foreach(avc, &anon_vma->rb_root, pgoff, pgoff) {
struct vm_area_struct *vma = avc->vma;
unsigned long address = vma_address(page, vma);
@@ -1718,7 +1718,7 @@ static int rmap_walk_anon(struct page *page, int (*rmap_one)(struct page *,
if (ret != SWAP_AGAIN)
break;
}
- anon_vma_unlock(anon_vma);
+ anon_vma_unlock_read(anon_vma);
return ret;
}
diff --git a/mm/vmstat.c b/mm/vmstat.c
index df14808f0a3..9800306c819 100644
--- a/mm/vmstat.c
+++ b/mm/vmstat.c
@@ -774,10 +774,20 @@ const char * const vmstat_text[] = {
"pgrotated",
+#ifdef CONFIG_NUMA_BALANCING
+ "numa_pte_updates",
+ "numa_hint_faults",
+ "numa_hint_faults_local",
+ "numa_pages_migrated",
+#endif
+#ifdef CONFIG_MIGRATION
+ "pgmigrate_success",
+ "pgmigrate_fail",
+#endif
#ifdef CONFIG_COMPACTION
- "compact_blocks_moved",
- "compact_pages_moved",
- "compact_pagemigrate_failed",
+ "compact_migrate_scanned",
+ "compact_free_scanned",
+ "compact_isolated",
"compact_stall",
"compact_fail",
"compact_success",
generated by cgit v1.2.3-70-g09d2 (git 2.51.2) at 2025-11-04 08:06:32 +0000