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-rw-r--r--mm/huge_memory.c441
1 files changed, 211 insertions, 230 deletions
diff --git a/mm/huge_memory.c b/mm/huge_memory.c
index 141dbb695097..40f17c34b415 100644
--- a/mm/huge_memory.c
+++ b/mm/huge_memory.c
@@ -17,6 +17,7 @@
#include <linux/khugepaged.h>
#include <linux/freezer.h>
#include <linux/mman.h>
+#include <linux/pagemap.h>
#include <asm/tlb.h>
#include <asm/pgalloc.h>
#include "internal.h"
@@ -102,10 +103,7 @@ static int set_recommended_min_free_kbytes(void)
unsigned long recommended_min;
extern int min_free_kbytes;
- if (!test_bit(TRANSPARENT_HUGEPAGE_FLAG,
- &transparent_hugepage_flags) &&
- !test_bit(TRANSPARENT_HUGEPAGE_REQ_MADV_FLAG,
- &transparent_hugepage_flags))
+ if (!khugepaged_enabled())
return 0;
for_each_populated_zone(zone)
@@ -139,12 +137,6 @@ static int start_khugepaged(void)
{
int err = 0;
if (khugepaged_enabled()) {
- int wakeup;
- if (unlikely(!mm_slot_cache || !mm_slots_hash)) {
- err = -ENOMEM;
- goto out;
- }
- mutex_lock(&khugepaged_mutex);
if (!khugepaged_thread)
khugepaged_thread = kthread_run(khugepaged, NULL,
"khugepaged");
@@ -154,16 +146,16 @@ static int start_khugepaged(void)
err = PTR_ERR(khugepaged_thread);
khugepaged_thread = NULL;
}
- wakeup = !list_empty(&khugepaged_scan.mm_head);
- mutex_unlock(&khugepaged_mutex);
- if (wakeup)
+
+ if (!list_empty(&khugepaged_scan.mm_head))
wake_up_interruptible(&khugepaged_wait);
set_recommended_min_free_kbytes();
- } else
- /* wakeup to exit */
- wake_up_interruptible(&khugepaged_wait);
-out:
+ } else if (khugepaged_thread) {
+ kthread_stop(khugepaged_thread);
+ khugepaged_thread = NULL;
+ }
+
return err;
}
@@ -224,18 +216,16 @@ static ssize_t enabled_store(struct kobject *kobj,
TRANSPARENT_HUGEPAGE_REQ_MADV_FLAG);
if (ret > 0) {
- int err = start_khugepaged();
+ int err;
+
+ mutex_lock(&khugepaged_mutex);
+ err = start_khugepaged();
+ mutex_unlock(&khugepaged_mutex);
+
if (err)
ret = err;
}
- if (ret > 0 &&
- (test_bit(TRANSPARENT_HUGEPAGE_FLAG,
- &transparent_hugepage_flags) ||
- test_bit(TRANSPARENT_HUGEPAGE_REQ_MADV_FLAG,
- &transparent_hugepage_flags)))
- set_recommended_min_free_kbytes();
-
return ret;
}
static struct kobj_attribute enabled_attr =
@@ -570,8 +560,6 @@ static int __init hugepage_init(void)
start_khugepaged();
- set_recommended_min_free_kbytes();
-
return 0;
out:
hugepage_exit_sysfs(hugepage_kobj);
@@ -611,19 +599,6 @@ out:
}
__setup("transparent_hugepage=", setup_transparent_hugepage);
-static void prepare_pmd_huge_pte(pgtable_t pgtable,
- struct mm_struct *mm)
-{
- assert_spin_locked(&mm->page_table_lock);
-
- /* FIFO */
- if (!mm->pmd_huge_pte)
- INIT_LIST_HEAD(&pgtable->lru);
- else
- list_add(&pgtable->lru, &mm->pmd_huge_pte->lru);
- mm->pmd_huge_pte = pgtable;
-}
-
static inline pmd_t maybe_pmd_mkwrite(pmd_t pmd, struct vm_area_struct *vma)
{
if (likely(vma->vm_flags & VM_WRITE))
@@ -665,7 +640,7 @@ static int __do_huge_pmd_anonymous_page(struct mm_struct *mm,
*/
page_add_new_anon_rmap(page, vma, haddr);
set_pmd_at(mm, haddr, pmd, entry);
- prepare_pmd_huge_pte(pgtable, mm);
+ pgtable_trans_huge_deposit(mm, pgtable);
add_mm_counter(mm, MM_ANONPAGES, HPAGE_PMD_NR);
mm->nr_ptes++;
spin_unlock(&mm->page_table_lock);
@@ -791,7 +766,7 @@ int copy_huge_pmd(struct mm_struct *dst_mm, struct mm_struct *src_mm,
pmdp_set_wrprotect(src_mm, addr, src_pmd);
pmd = pmd_mkold(pmd_wrprotect(pmd));
set_pmd_at(dst_mm, addr, dst_pmd, pmd);
- prepare_pmd_huge_pte(pgtable, dst_mm);
+ pgtable_trans_huge_deposit(dst_mm, pgtable);
dst_mm->nr_ptes++;
ret = 0;
@@ -802,25 +777,6 @@ out:
return ret;
}
-/* no "address" argument so destroys page coloring of some arch */
-pgtable_t get_pmd_huge_pte(struct mm_struct *mm)
-{
- pgtable_t pgtable;
-
- assert_spin_locked(&mm->page_table_lock);
-
- /* FIFO */
- pgtable = mm->pmd_huge_pte;
- if (list_empty(&pgtable->lru))
- mm->pmd_huge_pte = NULL;
- else {
- mm->pmd_huge_pte = list_entry(pgtable->lru.next,
- struct page, lru);
- list_del(&pgtable->lru);
- }
- return pgtable;
-}
-
static int do_huge_pmd_wp_page_fallback(struct mm_struct *mm,
struct vm_area_struct *vma,
unsigned long address,
@@ -832,6 +788,8 @@ static int do_huge_pmd_wp_page_fallback(struct mm_struct *mm,
pmd_t _pmd;
int ret = 0, i;
struct page **pages;
+ unsigned long mmun_start; /* For mmu_notifiers */
+ unsigned long mmun_end; /* For mmu_notifiers */
pages = kmalloc(sizeof(struct page *) * HPAGE_PMD_NR,
GFP_KERNEL);
@@ -868,15 +826,19 @@ static int do_huge_pmd_wp_page_fallback(struct mm_struct *mm,
cond_resched();
}
+ mmun_start = haddr;
+ mmun_end = haddr + HPAGE_PMD_SIZE;
+ mmu_notifier_invalidate_range_start(mm, mmun_start, mmun_end);
+
spin_lock(&mm->page_table_lock);
if (unlikely(!pmd_same(*pmd, orig_pmd)))
goto out_free_pages;
VM_BUG_ON(!PageHead(page));
- pmdp_clear_flush_notify(vma, haddr, pmd);
+ pmdp_clear_flush(vma, haddr, pmd);
/* leave pmd empty until pte is filled */
- pgtable = get_pmd_huge_pte(mm);
+ pgtable = pgtable_trans_huge_withdraw(mm);
pmd_populate(mm, &_pmd, pgtable);
for (i = 0; i < HPAGE_PMD_NR; i++, haddr += PAGE_SIZE) {
@@ -896,6 +858,8 @@ static int do_huge_pmd_wp_page_fallback(struct mm_struct *mm,
page_remove_rmap(page);
spin_unlock(&mm->page_table_lock);
+ mmu_notifier_invalidate_range_end(mm, mmun_start, mmun_end);
+
ret |= VM_FAULT_WRITE;
put_page(page);
@@ -904,6 +868,7 @@ out:
out_free_pages:
spin_unlock(&mm->page_table_lock);
+ mmu_notifier_invalidate_range_end(mm, mmun_start, mmun_end);
mem_cgroup_uncharge_start();
for (i = 0; i < HPAGE_PMD_NR; i++) {
mem_cgroup_uncharge_page(pages[i]);
@@ -920,6 +885,8 @@ int do_huge_pmd_wp_page(struct mm_struct *mm, struct vm_area_struct *vma,
int ret = 0;
struct page *page, *new_page;
unsigned long haddr;
+ unsigned long mmun_start; /* For mmu_notifiers */
+ unsigned long mmun_end; /* For mmu_notifiers */
VM_BUG_ON(!vma->anon_vma);
spin_lock(&mm->page_table_lock);
@@ -934,7 +901,7 @@ int do_huge_pmd_wp_page(struct mm_struct *mm, struct vm_area_struct *vma,
entry = pmd_mkyoung(orig_pmd);
entry = maybe_pmd_mkwrite(pmd_mkdirty(entry), vma);
if (pmdp_set_access_flags(vma, haddr, pmd, entry, 1))
- update_mmu_cache(vma, address, entry);
+ update_mmu_cache_pmd(vma, address, pmd);
ret |= VM_FAULT_WRITE;
goto out_unlock;
}
@@ -970,38 +937,47 @@ int do_huge_pmd_wp_page(struct mm_struct *mm, struct vm_area_struct *vma,
copy_user_huge_page(new_page, page, haddr, vma, HPAGE_PMD_NR);
__SetPageUptodate(new_page);
+ mmun_start = haddr;
+ mmun_end = haddr + HPAGE_PMD_SIZE;
+ mmu_notifier_invalidate_range_start(mm, mmun_start, mmun_end);
+
spin_lock(&mm->page_table_lock);
put_page(page);
if (unlikely(!pmd_same(*pmd, orig_pmd))) {
spin_unlock(&mm->page_table_lock);
mem_cgroup_uncharge_page(new_page);
put_page(new_page);
- goto out;
+ goto out_mn;
} else {
pmd_t entry;
VM_BUG_ON(!PageHead(page));
entry = mk_pmd(new_page, vma->vm_page_prot);
entry = maybe_pmd_mkwrite(pmd_mkdirty(entry), vma);
entry = pmd_mkhuge(entry);
- pmdp_clear_flush_notify(vma, haddr, pmd);
+ pmdp_clear_flush(vma, haddr, pmd);
page_add_new_anon_rmap(new_page, vma, haddr);
set_pmd_at(mm, haddr, pmd, entry);
- update_mmu_cache(vma, address, entry);
+ update_mmu_cache_pmd(vma, address, pmd);
page_remove_rmap(page);
put_page(page);
ret |= VM_FAULT_WRITE;
}
-out_unlock:
spin_unlock(&mm->page_table_lock);
+out_mn:
+ mmu_notifier_invalidate_range_end(mm, mmun_start, mmun_end);
out:
return ret;
+out_unlock:
+ spin_unlock(&mm->page_table_lock);
+ return ret;
}
-struct page *follow_trans_huge_pmd(struct mm_struct *mm,
+struct page *follow_trans_huge_pmd(struct vm_area_struct *vma,
unsigned long addr,
pmd_t *pmd,
unsigned int flags)
{
+ struct mm_struct *mm = vma->vm_mm;
struct page *page = NULL;
assert_spin_locked(&mm->page_table_lock);
@@ -1024,6 +1000,14 @@ struct page *follow_trans_huge_pmd(struct mm_struct *mm,
_pmd = pmd_mkyoung(pmd_mkdirty(*pmd));
set_pmd_at(mm, addr & HPAGE_PMD_MASK, pmd, _pmd);
}
+ if ((flags & FOLL_MLOCK) && (vma->vm_flags & VM_LOCKED)) {
+ if (page->mapping && trylock_page(page)) {
+ lru_add_drain();
+ if (page->mapping)
+ mlock_vma_page(page);
+ unlock_page(page);
+ }
+ }
page += (addr & ~HPAGE_PMD_MASK) >> PAGE_SHIFT;
VM_BUG_ON(!PageCompound(page));
if (flags & FOLL_GET)
@@ -1041,9 +1025,10 @@ int zap_huge_pmd(struct mmu_gather *tlb, struct vm_area_struct *vma,
if (__pmd_trans_huge_lock(pmd, vma) == 1) {
struct page *page;
pgtable_t pgtable;
- pgtable = get_pmd_huge_pte(tlb->mm);
- page = pmd_page(*pmd);
- pmd_clear(pmd);
+ pmd_t orig_pmd;
+ pgtable = pgtable_trans_huge_withdraw(tlb->mm);
+ orig_pmd = pmdp_get_and_clear(tlb->mm, addr, pmd);
+ page = pmd_page(orig_pmd);
tlb_remove_pmd_tlb_entry(tlb, pmd, addr);
page_remove_rmap(page);
VM_BUG_ON(page_mapcount(page) < 0);
@@ -1207,7 +1192,11 @@ static int __split_huge_page_splitting(struct page *page,
struct mm_struct *mm = vma->vm_mm;
pmd_t *pmd;
int ret = 0;
+ /* For mmu_notifiers */
+ const unsigned long mmun_start = address;
+ const unsigned long mmun_end = address + HPAGE_PMD_SIZE;
+ mmu_notifier_invalidate_range_start(mm, mmun_start, mmun_end);
spin_lock(&mm->page_table_lock);
pmd = page_check_address_pmd(page, mm, address,
PAGE_CHECK_ADDRESS_PMD_NOTSPLITTING_FLAG);
@@ -1219,10 +1208,11 @@ static int __split_huge_page_splitting(struct page *page,
* and it won't wait on the anon_vma->root->mutex to
* serialize against split_huge_page*.
*/
- pmdp_splitting_flush_notify(vma, address, pmd);
+ pmdp_splitting_flush(vma, address, pmd);
ret = 1;
}
spin_unlock(&mm->page_table_lock);
+ mmu_notifier_invalidate_range_end(mm, mmun_start, mmun_end);
return ret;
}
@@ -1358,11 +1348,11 @@ static int __split_huge_page_map(struct page *page,
pmd = page_check_address_pmd(page, mm, address,
PAGE_CHECK_ADDRESS_PMD_SPLITTING_FLAG);
if (pmd) {
- pgtable = get_pmd_huge_pte(mm);
+ pgtable = pgtable_trans_huge_withdraw(mm);
pmd_populate(mm, &_pmd, pgtable);
- for (i = 0, haddr = address; i < HPAGE_PMD_NR;
- i++, haddr += PAGE_SIZE) {
+ haddr = address;
+ for (i = 0; i < HPAGE_PMD_NR; i++, haddr += PAGE_SIZE) {
pte_t *pte, entry;
BUG_ON(PageCompound(page+i));
entry = mk_pte(page + i, vma->vm_page_prot);
@@ -1406,8 +1396,7 @@ static int __split_huge_page_map(struct page *page,
* SMP TLB and finally we write the non-huge version
* of the pmd entry with pmd_populate.
*/
- set_pmd_at(mm, address, pmd, pmd_mknotpresent(*pmd));
- flush_tlb_range(vma, address, address + HPAGE_PMD_SIZE);
+ pmdp_invalidate(vma, address, pmd);
pmd_populate(mm, pmd, pgtable);
ret = 1;
}
@@ -1421,18 +1410,17 @@ static void __split_huge_page(struct page *page,
struct anon_vma *anon_vma)
{
int mapcount, mapcount2;
+ pgoff_t pgoff = page->index << (PAGE_CACHE_SHIFT - PAGE_SHIFT);
struct anon_vma_chain *avc;
BUG_ON(!PageHead(page));
BUG_ON(PageTail(page));
mapcount = 0;
- list_for_each_entry(avc, &anon_vma->head, same_anon_vma) {
+ anon_vma_interval_tree_foreach(avc, &anon_vma->rb_root, pgoff, pgoff) {
struct vm_area_struct *vma = avc->vma;
unsigned long addr = vma_address(page, vma);
BUG_ON(is_vma_temporary_stack(vma));
- if (addr == -EFAULT)
- continue;
mapcount += __split_huge_page_splitting(page, vma, addr);
}
/*
@@ -1453,12 +1441,10 @@ static void __split_huge_page(struct page *page,
__split_huge_page_refcount(page);
mapcount2 = 0;
- list_for_each_entry(avc, &anon_vma->head, same_anon_vma) {
+ anon_vma_interval_tree_foreach(avc, &anon_vma->rb_root, pgoff, pgoff) {
struct vm_area_struct *vma = avc->vma;
unsigned long addr = vma_address(page, vma);
BUG_ON(is_vma_temporary_stack(vma));
- if (addr == -EFAULT)
- continue;
mapcount2 += __split_huge_page_map(page, vma, addr);
}
if (mapcount != mapcount2)
@@ -1491,12 +1477,13 @@ out:
return ret;
}
-#define VM_NO_THP (VM_SPECIAL|VM_INSERTPAGE|VM_MIXEDMAP|VM_SAO| \
- VM_HUGETLB|VM_SHARED|VM_MAYSHARE)
+#define VM_NO_THP (VM_SPECIAL|VM_MIXEDMAP|VM_HUGETLB|VM_SHARED|VM_MAYSHARE)
int hugepage_madvise(struct vm_area_struct *vma,
unsigned long *vm_flags, int advice)
{
+ struct mm_struct *mm = vma->vm_mm;
+
switch (advice) {
case MADV_HUGEPAGE:
/*
@@ -1504,6 +1491,8 @@ int hugepage_madvise(struct vm_area_struct *vma,
*/
if (*vm_flags & (VM_HUGEPAGE | VM_NO_THP))
return -EINVAL;
+ if (mm->def_flags & VM_NOHUGEPAGE)
+ return -EINVAL;
*vm_flags &= ~VM_NOHUGEPAGE;
*vm_flags |= VM_HUGEPAGE;
/*
@@ -1655,11 +1644,7 @@ int khugepaged_enter_vma_merge(struct vm_area_struct *vma)
if (vma->vm_ops)
/* khugepaged not yet working on file or special mappings */
return 0;
- /*
- * If is_pfn_mapping() is true is_learn_pfn_mapping() must be
- * true too, verify it here.
- */
- VM_BUG_ON(is_linear_pfn_mapping(vma) || vma->vm_flags & VM_NO_THP);
+ VM_BUG_ON(vma->vm_flags & VM_NO_THP);
hstart = (vma->vm_start + ~HPAGE_PMD_MASK) & HPAGE_PMD_MASK;
hend = vma->vm_end & HPAGE_PMD_MASK;
if (hstart < hend)
@@ -1833,28 +1818,35 @@ static void __collapse_huge_page_copy(pte_t *pte, struct page *page,
}
}
-static void collapse_huge_page(struct mm_struct *mm,
- unsigned long address,
- struct page **hpage,
- struct vm_area_struct *vma,
- int node)
+static void khugepaged_alloc_sleep(void)
{
- pgd_t *pgd;
- pud_t *pud;
- pmd_t *pmd, _pmd;
- pte_t *pte;
- pgtable_t pgtable;
- struct page *new_page;
- spinlock_t *ptl;
- int isolated;
- unsigned long hstart, hend;
+ wait_event_freezable_timeout(khugepaged_wait, false,
+ msecs_to_jiffies(khugepaged_alloc_sleep_millisecs));
+}
- VM_BUG_ON(address & ~HPAGE_PMD_MASK);
-#ifndef CONFIG_NUMA
- up_read(&mm->mmap_sem);
- VM_BUG_ON(!*hpage);
- new_page = *hpage;
-#else
+#ifdef CONFIG_NUMA
+static bool khugepaged_prealloc_page(struct page **hpage, bool *wait)
+{
+ if (IS_ERR(*hpage)) {
+ if (!*wait)
+ return false;
+
+ *wait = false;
+ *hpage = NULL;
+ khugepaged_alloc_sleep();
+ } else if (*hpage) {
+ put_page(*hpage);
+ *hpage = NULL;
+ }
+
+ return true;
+}
+
+static struct page
+*khugepaged_alloc_page(struct page **hpage, struct mm_struct *mm,
+ struct vm_area_struct *vma, unsigned long address,
+ int node)
+{
VM_BUG_ON(*hpage);
/*
* Allocate the page while the vma is still valid and under
@@ -1866,7 +1858,7 @@ static void collapse_huge_page(struct mm_struct *mm,
* mmap_sem in read mode is good idea also to allow greater
* scalability.
*/
- new_page = alloc_hugepage_vma(khugepaged_defrag(), vma, address,
+ *hpage = alloc_hugepage_vma(khugepaged_defrag(), vma, address,
node, __GFP_OTHER_NODE);
/*
@@ -1874,20 +1866,85 @@ static void collapse_huge_page(struct mm_struct *mm,
* preparation for taking it in write mode.
*/
up_read(&mm->mmap_sem);
- if (unlikely(!new_page)) {
+ if (unlikely(!*hpage)) {
count_vm_event(THP_COLLAPSE_ALLOC_FAILED);
*hpage = ERR_PTR(-ENOMEM);
- return;
+ return NULL;
}
-#endif
count_vm_event(THP_COLLAPSE_ALLOC);
- if (unlikely(mem_cgroup_newpage_charge(new_page, mm, GFP_KERNEL))) {
-#ifdef CONFIG_NUMA
- put_page(new_page);
+ return *hpage;
+}
+#else
+static struct page *khugepaged_alloc_hugepage(bool *wait)
+{
+ struct page *hpage;
+
+ do {
+ hpage = alloc_hugepage(khugepaged_defrag());
+ if (!hpage) {
+ count_vm_event(THP_COLLAPSE_ALLOC_FAILED);
+ if (!*wait)
+ return NULL;
+
+ *wait = false;
+ khugepaged_alloc_sleep();
+ } else
+ count_vm_event(THP_COLLAPSE_ALLOC);
+ } while (unlikely(!hpage) && likely(khugepaged_enabled()));
+
+ return hpage;
+}
+
+static bool khugepaged_prealloc_page(struct page **hpage, bool *wait)
+{
+ if (!*hpage)
+ *hpage = khugepaged_alloc_hugepage(wait);
+
+ if (unlikely(!*hpage))
+ return false;
+
+ return true;
+}
+
+static struct page
+*khugepaged_alloc_page(struct page **hpage, 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
+
+static void collapse_huge_page(struct mm_struct *mm,
+ unsigned long address,
+ struct page **hpage,
+ struct vm_area_struct *vma,
+ int node)
+{
+ pgd_t *pgd;
+ pud_t *pud;
+ pmd_t *pmd, _pmd;
+ pte_t *pte;
+ pgtable_t pgtable;
+ struct page *new_page;
+ spinlock_t *ptl;
+ int isolated;
+ unsigned long hstart, hend;
+ unsigned long mmun_start; /* For mmu_notifiers */
+ unsigned long mmun_end; /* For mmu_notifiers */
+
+ VM_BUG_ON(address & ~HPAGE_PMD_MASK);
+
+ /* release the mmap_sem read lock. */
+ new_page = khugepaged_alloc_page(hpage, mm, vma, address, node);
+ if (!new_page)
+ return;
+
+ if (unlikely(mem_cgroup_newpage_charge(new_page, mm, GFP_KERNEL)))
return;
- }
/*
* Prevent all access to pagetables with the exception of
@@ -1912,11 +1969,7 @@ static void collapse_huge_page(struct mm_struct *mm,
goto out;
if (is_vma_temporary_stack(vma))
goto out;
- /*
- * If is_pfn_mapping() is true is_learn_pfn_mapping() must be
- * true too, verify it here.
- */
- VM_BUG_ON(is_linear_pfn_mapping(vma) || vma->vm_flags & VM_NO_THP);
+ VM_BUG_ON(vma->vm_flags & VM_NO_THP);
pgd = pgd_offset(mm, address);
if (!pgd_present(*pgd))
@@ -1936,6 +1989,9 @@ static void collapse_huge_page(struct mm_struct *mm,
pte = pte_offset_map(pmd, address);
ptl = pte_lockptr(mm, pmd);
+ mmun_start = address;
+ mmun_end = address + HPAGE_PMD_SIZE;
+ mmu_notifier_invalidate_range_start(mm, mmun_start, mmun_end);
spin_lock(&mm->page_table_lock); /* probably unnecessary */
/*
* After this gup_fast can't run anymore. This also removes
@@ -1943,8 +1999,9 @@ static void collapse_huge_page(struct mm_struct *mm,
* huge and small TLB entries for the same virtual address
* to avoid the risk of CPU bugs in that area.
*/
- _pmd = pmdp_clear_flush_notify(vma, address, pmd);
+ _pmd = pmdp_clear_flush(vma, address, pmd);
spin_unlock(&mm->page_table_lock);
+ mmu_notifier_invalidate_range_end(mm, mmun_start, mmun_end);
spin_lock(ptl);
isolated = __collapse_huge_page_isolate(vma, address, pte);
@@ -1970,8 +2027,6 @@ static void collapse_huge_page(struct mm_struct *mm,
pte_unmap(pte);
__SetPageUptodate(new_page);
pgtable = pmd_pgtable(_pmd);
- VM_BUG_ON(page_count(pgtable) != 1);
- VM_BUG_ON(page_mapcount(pgtable) != 0);
_pmd = mk_pmd(new_page, vma->vm_page_prot);
_pmd = maybe_pmd_mkwrite(pmd_mkdirty(_pmd), vma);
@@ -1988,13 +2043,12 @@ static void collapse_huge_page(struct mm_struct *mm,
BUG_ON(!pmd_none(*pmd));
page_add_new_anon_rmap(new_page, vma, address);
set_pmd_at(mm, address, pmd, _pmd);
- update_mmu_cache(vma, address, _pmd);
- prepare_pmd_huge_pte(pgtable, mm);
+ update_mmu_cache_pmd(vma, address, pmd);
+ pgtable_trans_huge_deposit(mm, pgtable);
spin_unlock(&mm->page_table_lock);
-#ifndef CONFIG_NUMA
*hpage = NULL;
-#endif
+
khugepaged_pages_collapsed++;
out_up_write:
up_write(&mm->mmap_sem);
@@ -2002,9 +2056,6 @@ out_up_write:
out:
mem_cgroup_uncharge_page(new_page);
-#ifdef CONFIG_NUMA
- put_page(new_page);
-#endif
goto out_up_write;
}
@@ -2154,12 +2205,7 @@ static unsigned int khugepaged_scan_mm_slot(unsigned int pages,
goto skip;
if (is_vma_temporary_stack(vma))
goto skip;
- /*
- * If is_pfn_mapping() is true is_learn_pfn_mapping()
- * must be true too, verify it here.
- */
- VM_BUG_ON(is_linear_pfn_mapping(vma) ||
- vma->vm_flags & VM_NO_THP);
+ VM_BUG_ON(vma->vm_flags & VM_NO_THP);
hstart = (vma->vm_start + ~HPAGE_PMD_MASK) & HPAGE_PMD_MASK;
hend = vma->vm_end & HPAGE_PMD_MASK;
@@ -2234,32 +2280,23 @@ static int khugepaged_has_work(void)
static int khugepaged_wait_event(void)
{
return !list_empty(&khugepaged_scan.mm_head) ||
- !khugepaged_enabled();
+ kthread_should_stop();
}
-static void khugepaged_do_scan(struct page **hpage)
+static void khugepaged_do_scan(void)
{
+ struct page *hpage = NULL;
unsigned int progress = 0, pass_through_head = 0;
unsigned int pages = khugepaged_pages_to_scan;
+ bool wait = true;
barrier(); /* write khugepaged_pages_to_scan to local stack */
while (progress < pages) {
- cond_resched();
-
-#ifndef CONFIG_NUMA
- if (!*hpage) {
- *hpage = alloc_hugepage(khugepaged_defrag());
- if (unlikely(!*hpage)) {
- count_vm_event(THP_COLLAPSE_ALLOC_FAILED);
- break;
- }
- count_vm_event(THP_COLLAPSE_ALLOC);
- }
-#else
- if (IS_ERR(*hpage))
+ if (!khugepaged_prealloc_page(&hpage, &wait))
break;
-#endif
+
+ cond_resched();
if (unlikely(kthread_should_stop() || freezing(current)))
break;
@@ -2270,73 +2307,32 @@ static void khugepaged_do_scan(struct page **hpage)
if (khugepaged_has_work() &&
pass_through_head < 2)
progress += khugepaged_scan_mm_slot(pages - progress,
- hpage);
+ &hpage);
else
progress = pages;
spin_unlock(&khugepaged_mm_lock);
}
-}
-static void khugepaged_alloc_sleep(void)
-{
- wait_event_freezable_timeout(khugepaged_wait, false,
- msecs_to_jiffies(khugepaged_alloc_sleep_millisecs));
+ if (!IS_ERR_OR_NULL(hpage))
+ put_page(hpage);
}
-#ifndef CONFIG_NUMA
-static struct page *khugepaged_alloc_hugepage(void)
+static void khugepaged_wait_work(void)
{
- struct page *hpage;
-
- do {
- hpage = alloc_hugepage(khugepaged_defrag());
- if (!hpage) {
- count_vm_event(THP_COLLAPSE_ALLOC_FAILED);
- khugepaged_alloc_sleep();
- } else
- count_vm_event(THP_COLLAPSE_ALLOC);
- } while (unlikely(!hpage) &&
- likely(khugepaged_enabled()));
- return hpage;
-}
-#endif
+ try_to_freeze();
-static void khugepaged_loop(void)
-{
- struct page *hpage;
+ if (khugepaged_has_work()) {
+ if (!khugepaged_scan_sleep_millisecs)
+ return;
-#ifdef CONFIG_NUMA
- hpage = NULL;
-#endif
- while (likely(khugepaged_enabled())) {
-#ifndef CONFIG_NUMA
- hpage = khugepaged_alloc_hugepage();
- if (unlikely(!hpage))
- break;
-#else
- if (IS_ERR(hpage)) {
- khugepaged_alloc_sleep();
- hpage = NULL;
- }
-#endif
-
- khugepaged_do_scan(&hpage);
-#ifndef CONFIG_NUMA
- if (hpage)
- put_page(hpage);
-#endif
- try_to_freeze();
- if (unlikely(kthread_should_stop()))
- break;
- if (khugepaged_has_work()) {
- if (!khugepaged_scan_sleep_millisecs)
- continue;
- wait_event_freezable_timeout(khugepaged_wait, false,
- msecs_to_jiffies(khugepaged_scan_sleep_millisecs));
- } else if (khugepaged_enabled())
- wait_event_freezable(khugepaged_wait,
- khugepaged_wait_event());
+ wait_event_freezable_timeout(khugepaged_wait,
+ kthread_should_stop(),
+ msecs_to_jiffies(khugepaged_scan_sleep_millisecs));
+ return;
}
+
+ if (khugepaged_enabled())
+ wait_event_freezable(khugepaged_wait, khugepaged_wait_event());
}
static int khugepaged(void *none)
@@ -2346,20 +2342,9 @@ static int khugepaged(void *none)
set_freezable();
set_user_nice(current, 19);
- /* serialize with start_khugepaged() */
- mutex_lock(&khugepaged_mutex);
-
- for (;;) {
- mutex_unlock(&khugepaged_mutex);
- VM_BUG_ON(khugepaged_thread != current);
- khugepaged_loop();
- VM_BUG_ON(khugepaged_thread != current);
-
- mutex_lock(&khugepaged_mutex);
- if (!khugepaged_enabled())
- break;
- if (unlikely(kthread_should_stop()))
- break;
+ while (!kthread_should_stop()) {
+ khugepaged_do_scan();
+ khugepaged_wait_work();
}
spin_lock(&khugepaged_mm_lock);
@@ -2368,10 +2353,6 @@ static int khugepaged(void *none)
if (mm_slot)
collect_mm_slot(mm_slot);
spin_unlock(&khugepaged_mm_lock);
-
- khugepaged_thread = NULL;
- mutex_unlock(&khugepaged_mutex);
-
return 0;
}
generated by cgit v1.2.3 (git 2.39.0) at 2024-11-23 20:19:54 +0300