static int khugepaged(void *none);
static int khugepaged_slab_init(void);
+static void khugepaged_slab_exit(void);
#define MM_SLOTS_HASH_BITS 10
static __read_mostly DEFINE_HASHTABLE(mm_slots_hash, MM_SLOTS_HASH_BITS);
int nr_zones = 0;
unsigned long recommended_min;
- if (!khugepaged_enabled())
- return 0;
-
for_each_populated_zone(zone)
nr_zones++;
setup_per_zone_wmarks();
return 0;
}
-late_initcall(set_recommended_min_free_kbytes);
-static int start_khugepaged(void)
+static int start_stop_khugepaged(void)
{
int err = 0;
if (khugepaged_enabled()) {
pr_err("khugepaged: kthread_run(khugepaged) failed\n");
err = PTR_ERR(khugepaged_thread);
khugepaged_thread = NULL;
+ goto fail;
}
if (!list_empty(&khugepaged_scan.mm_head))
kthread_stop(khugepaged_thread);
khugepaged_thread = NULL;
}
-
+fail:
return err;
}
struct page *zero_page;
retry:
if (likely(atomic_inc_not_zero(&huge_zero_refcount)))
- return ACCESS_ONCE(huge_zero_page);
+ return READ_ONCE(huge_zero_page);
zero_page = alloc_pages((GFP_TRANSHUGE | __GFP_ZERO) & ~__GFP_MOVABLE,
HPAGE_PMD_ORDER);
/* We take additional reference here. It will be put back by shrinker */
atomic_set(&huge_zero_refcount, 2);
preempt_enable();
- return ACCESS_ONCE(huge_zero_page);
+ return READ_ONCE(huge_zero_page);
}
static void put_huge_zero_page(void)
int err;
mutex_lock(&khugepaged_mutex);
- err = start_khugepaged();
+ err = start_stop_khugepaged();
mutex_unlock(&khugepaged_mutex);
if (err)
err = hugepage_init_sysfs(&hugepage_kobj);
if (err)
- return err;
+ goto err_sysfs;
err = khugepaged_slab_init();
if (err)
- goto out;
+ goto err_slab;
- register_shrinker(&huge_zero_page_shrinker);
+ err = register_shrinker(&huge_zero_page_shrinker);
+ if (err)
+ goto err_hzp_shrinker;
/*
* By default disable transparent hugepages on smaller systems,
* where the extra memory used could hurt more than TLB overhead
* is likely to save. The admin can still enable it through /sys.
*/
- if (totalram_pages < (512 << (20 - PAGE_SHIFT)))
+ if (totalram_pages < (512 << (20 - PAGE_SHIFT))) {
transparent_hugepage_flags = 0;
+ return 0;
+ }
- start_khugepaged();
+ err = start_stop_khugepaged();
+ if (err)
+ goto err_khugepaged;
return 0;
-out:
+err_khugepaged:
+ unregister_shrinker(&huge_zero_page_shrinker);
+err_hzp_shrinker:
+ khugepaged_slab_exit();
+err_slab:
hugepage_exit_sysfs(hugepage_kobj);
+err_sysfs:
return err;
}
subsys_initcall(hugepage_init);
static int __do_huge_pmd_anonymous_page(struct mm_struct *mm,
struct vm_area_struct *vma,
unsigned long haddr, pmd_t *pmd,
- struct page *page)
+ struct page *page, gfp_t gfp)
{
struct mem_cgroup *memcg;
pgtable_t pgtable;
VM_BUG_ON_PAGE(!PageCompound(page), page);
- if (mem_cgroup_try_charge(page, mm, GFP_TRANSHUGE, &memcg))
+ if (mem_cgroup_try_charge(page, mm, gfp, &memcg))
return VM_FAULT_OOM;
pgtable = pte_alloc_one(mm, haddr);
count_vm_event(THP_FAULT_FALLBACK);
return VM_FAULT_FALLBACK;
}
- if (unlikely(__do_huge_pmd_anonymous_page(mm, vma, haddr, pmd, page))) {
+ if (unlikely(__do_huge_pmd_anonymous_page(mm, vma, haddr, pmd, page, gfp))) {
put_page(page);
count_vm_event(THP_FAULT_FALLBACK);
return VM_FAULT_FALLBACK;
unsigned long haddr;
unsigned long mmun_start; /* For mmu_notifiers */
unsigned long mmun_end; /* For mmu_notifiers */
+ gfp_t huge_gfp; /* for allocation and charge */
ptl = pmd_lockptr(mm, pmd);
VM_BUG_ON_VMA(!vma->anon_vma, vma);
alloc:
if (transparent_hugepage_enabled(vma) &&
!transparent_hugepage_debug_cow()) {
- gfp_t gfp;
-
- gfp = alloc_hugepage_gfpmask(transparent_hugepage_defrag(vma), 0);
- new_page = alloc_hugepage_vma(gfp, vma, haddr, HPAGE_PMD_ORDER);
+ huge_gfp = alloc_hugepage_gfpmask(transparent_hugepage_defrag(vma), 0);
+ new_page = alloc_hugepage_vma(huge_gfp, vma, haddr, HPAGE_PMD_ORDER);
} else
new_page = NULL;
goto out;
}
- if (unlikely(mem_cgroup_try_charge(new_page, mm,
- GFP_TRANSHUGE, &memcg))) {
+ if (unlikely(mem_cgroup_try_charge(new_page, mm, huge_gfp, &memcg))) {
put_page(new_page);
if (page) {
split_huge_page(page);
pmd, _pmd, 1))
update_mmu_cache_pmd(vma, addr, pmd);
}
- if ((flags & FOLL_MLOCK) && (vma->vm_flags & VM_LOCKED)) {
+ if ((flags & FOLL_POPULATE) && (vma->vm_flags & VM_LOCKED)) {
if (page->mapping && trylock_page(page)) {
lru_add_drain();
if (page->mapping)
return 0;
}
+static void __init khugepaged_slab_exit(void)
+{
+ kmem_cache_destroy(mm_slot_cache);
+}
+
static inline struct mm_slot *alloc_mm_slot(void)
{
if (!mm_slot_cache) /* initialization failed */
{
while (--_pte >= pte) {
pte_t pteval = *_pte;
- if (!pte_none(pteval))
+ if (!pte_none(pteval) && !is_zero_pfn(pte_pfn(pteval)))
release_pte_page(pte_page(pteval));
}
}
{
struct page *page;
pte_t *_pte;
- int none = 0;
+ int none_or_zero = 0;
bool referenced = false, writable = false;
for (_pte = pte; _pte < pte+HPAGE_PMD_NR;
_pte++, address += PAGE_SIZE) {
pte_t pteval = *_pte;
- if (pte_none(pteval)) {
- if (++none <= khugepaged_max_ptes_none)
+ if (pte_none(pteval) || is_zero_pfn(pte_pfn(pteval))) {
+ if (++none_or_zero <= khugepaged_max_ptes_none)
continue;
else
goto out;
pte_t pteval = *_pte;
struct page *src_page;
- if (pte_none(pteval)) {
+ if (pte_none(pteval) || is_zero_pfn(pte_pfn(pteval))) {
clear_user_highpage(page, address);
add_mm_counter(vma->vm_mm, MM_ANONPAGES, 1);
+ if (is_zero_pfn(pte_pfn(pteval))) {
+ /*
+ * ptl mostly unnecessary.
+ */
+ spin_lock(ptl);
+ /*
+ * paravirt calls inside pte_clear here are
+ * superfluous.
+ */
+ pte_clear(vma->vm_mm, address, _pte);
+ spin_unlock(ptl);
+ }
} else {
src_page = pte_page(pteval);
copy_user_highpage(page, src_page, address, vma);
return true;
}
-static struct page
-*khugepaged_alloc_page(struct page **hpage, struct mm_struct *mm,
+static struct page *
+khugepaged_alloc_page(struct page **hpage, gfp_t gfp, struct mm_struct *mm,
struct vm_area_struct *vma, unsigned long address,
int node)
{
*/
up_read(&mm->mmap_sem);
- *hpage = alloc_pages_exact_node(node, alloc_hugepage_gfpmask(
- khugepaged_defrag(), __GFP_OTHER_NODE), HPAGE_PMD_ORDER);
+ *hpage = alloc_pages_exact_node(node, gfp, HPAGE_PMD_ORDER);
if (unlikely(!*hpage)) {
count_vm_event(THP_COLLAPSE_ALLOC_FAILED);
*hpage = ERR_PTR(-ENOMEM);
return true;
}
-static struct page
-*khugepaged_alloc_page(struct page **hpage, struct mm_struct *mm,
+static struct page *
+khugepaged_alloc_page(struct page **hpage, gfp_t gfp, struct mm_struct *mm,
struct vm_area_struct *vma, unsigned long address,
int node)
{
up_read(&mm->mmap_sem);
VM_BUG_ON(!*hpage);
+
return *hpage;
}
#endif
struct mem_cgroup *memcg;
unsigned long mmun_start; /* For mmu_notifiers */
unsigned long mmun_end; /* For mmu_notifiers */
+ gfp_t gfp;
VM_BUG_ON(address & ~HPAGE_PMD_MASK);
+ /* Only allocate from the target node */
+ gfp = alloc_hugepage_gfpmask(khugepaged_defrag(), __GFP_OTHER_NODE) |
+ __GFP_THISNODE;
+
/* release the mmap_sem read lock. */
- new_page = khugepaged_alloc_page(hpage, mm, vma, address, node);
+ new_page = khugepaged_alloc_page(hpage, gfp, mm, vma, address, node);
if (!new_page)
return;
if (unlikely(mem_cgroup_try_charge(new_page, mm,
- GFP_TRANSHUGE, &memcg)))
+ gfp, &memcg)))
return;
/*
{
pmd_t *pmd;
pte_t *pte, *_pte;
- int ret = 0, none = 0;
+ int ret = 0, none_or_zero = 0;
struct page *page;
unsigned long _address;
spinlock_t *ptl;
for (_address = address, _pte = pte; _pte < pte+HPAGE_PMD_NR;
_pte++, _address += PAGE_SIZE) {
pte_t pteval = *_pte;
- if (pte_none(pteval)) {
- if (++none <= khugepaged_max_ptes_none)
+ if (pte_none(pteval) || is_zero_pfn(pte_pfn(pteval))) {
+ if (++none_or_zero <= khugepaged_max_ptes_none)
continue;
else
goto out_unmap;
projects / cascardo / linux.git / blobdiff