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authorIngo Molnar <mingo@kernel.org>2014-05-07 13:15:46 +0200
committerIngo Molnar <mingo@kernel.org>2014-05-07 13:15:46 +0200
commit2fe5de9ce7d57498abc14b375cad2fcf8c3ee6cc (patch)
tree9478e8cf470c1d5bdb2d89b57a7e35919ab95e72 /mm/huge_memory.c
parent08f8aeb55d7727d644dbbbbfb798fe937d47751d (diff)
parent2b4cfe64dee0d84506b951d81bf55d9891744d25 (diff)
downloadlinux-2fe5de9ce7d57498abc14b375cad2fcf8c3ee6cc.tar.bz2
Merge branch 'sched/urgent' into sched/core, to avoid conflicts
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'mm/huge_memory.c')
-rw-r--r--mm/huge_memory.c113
1 files changed, 25 insertions, 88 deletions
diff --git a/mm/huge_memory.c b/mm/huge_memory.c
index dcdb6f9adea1..d199d2d91946 100644
--- a/mm/huge_memory.c
+++ b/mm/huge_memory.c
@@ -827,7 +827,7 @@ int do_huge_pmd_anonymous_page(struct mm_struct *mm, struct vm_area_struct *vma,
count_vm_event(THP_FAULT_FALLBACK);
return VM_FAULT_FALLBACK;
}
- if (unlikely(mem_cgroup_newpage_charge(page, mm, GFP_KERNEL))) {
+ if (unlikely(mem_cgroup_charge_anon(page, mm, GFP_KERNEL))) {
put_page(page);
count_vm_event(THP_FAULT_FALLBACK);
return VM_FAULT_FALLBACK;
@@ -941,81 +941,6 @@ unlock:
spin_unlock(ptl);
}
-static int do_huge_pmd_wp_zero_page_fallback(struct mm_struct *mm,
- struct vm_area_struct *vma, unsigned long address,
- pmd_t *pmd, pmd_t orig_pmd, unsigned long haddr)
-{
- spinlock_t *ptl;
- pgtable_t pgtable;
- pmd_t _pmd;
- struct page *page;
- int i, ret = 0;
- unsigned long mmun_start; /* For mmu_notifiers */
- unsigned long mmun_end; /* For mmu_notifiers */
-
- page = alloc_page_vma(GFP_HIGHUSER_MOVABLE, vma, address);
- if (!page) {
- ret |= VM_FAULT_OOM;
- goto out;
- }
-
- if (mem_cgroup_newpage_charge(page, mm, GFP_KERNEL)) {
- put_page(page);
- ret |= VM_FAULT_OOM;
- goto out;
- }
-
- clear_user_highpage(page, address);
- __SetPageUptodate(page);
-
- mmun_start = haddr;
- mmun_end = haddr + HPAGE_PMD_SIZE;
- mmu_notifier_invalidate_range_start(mm, mmun_start, mmun_end);
-
- ptl = pmd_lock(mm, pmd);
- if (unlikely(!pmd_same(*pmd, orig_pmd)))
- goto out_free_page;
-
- pmdp_clear_flush(vma, haddr, pmd);
- /* leave pmd empty until pte is filled */
-
- pgtable = pgtable_trans_huge_withdraw(mm, pmd);
- pmd_populate(mm, &_pmd, pgtable);
-
- for (i = 0; i < HPAGE_PMD_NR; i++, haddr += PAGE_SIZE) {
- pte_t *pte, entry;
- if (haddr == (address & PAGE_MASK)) {
- entry = mk_pte(page, vma->vm_page_prot);
- entry = maybe_mkwrite(pte_mkdirty(entry), vma);
- page_add_new_anon_rmap(page, vma, haddr);
- } else {
- entry = pfn_pte(my_zero_pfn(haddr), vma->vm_page_prot);
- entry = pte_mkspecial(entry);
- }
- pte = pte_offset_map(&_pmd, haddr);
- VM_BUG_ON(!pte_none(*pte));
- set_pte_at(mm, haddr, pte, entry);
- pte_unmap(pte);
- }
- smp_wmb(); /* make pte visible before pmd */
- pmd_populate(mm, pmd, pgtable);
- spin_unlock(ptl);
- put_huge_zero_page();
- inc_mm_counter(mm, MM_ANONPAGES);
-
- mmu_notifier_invalidate_range_end(mm, mmun_start, mmun_end);
-
- ret |= VM_FAULT_WRITE;
-out:
- return ret;
-out_free_page:
- spin_unlock(ptl);
- mmu_notifier_invalidate_range_end(mm, mmun_start, mmun_end);
- mem_cgroup_uncharge_page(page);
- put_page(page);
- goto out;
-}
-
static int do_huge_pmd_wp_page_fallback(struct mm_struct *mm,
struct vm_area_struct *vma,
unsigned long address,
@@ -1043,7 +968,7 @@ static int do_huge_pmd_wp_page_fallback(struct mm_struct *mm,
__GFP_OTHER_NODE,
vma, address, page_to_nid(page));
if (unlikely(!pages[i] ||
- mem_cgroup_newpage_charge(pages[i], mm,
+ mem_cgroup_charge_anon(pages[i], mm,
GFP_KERNEL))) {
if (pages[i])
put_page(pages[i]);
@@ -1161,8 +1086,8 @@ alloc:
if (unlikely(!new_page)) {
if (!page) {
- ret = do_huge_pmd_wp_zero_page_fallback(mm, vma,
- address, pmd, orig_pmd, haddr);
+ split_huge_page_pmd(vma, address, pmd);
+ ret |= VM_FAULT_FALLBACK;
} else {
ret = do_huge_pmd_wp_page_fallback(mm, vma, address,
pmd, orig_pmd, page, haddr);
@@ -1176,7 +1101,7 @@ alloc:
goto out;
}
- if (unlikely(mem_cgroup_newpage_charge(new_page, mm, GFP_KERNEL))) {
+ if (unlikely(mem_cgroup_charge_anon(new_page, mm, GFP_KERNEL))) {
put_page(new_page);
if (page) {
split_huge_page(page);
@@ -1611,16 +1536,23 @@ pmd_t *page_check_address_pmd(struct page *page,
enum page_check_address_pmd_flag flag,
spinlock_t **ptl)
{
+ pgd_t *pgd;
+ pud_t *pud;
pmd_t *pmd;
if (address & ~HPAGE_PMD_MASK)
return NULL;
- pmd = mm_find_pmd(mm, address);
- if (!pmd)
+ pgd = pgd_offset(mm, address);
+ if (!pgd_present(*pgd))
return NULL;
+ pud = pud_offset(pgd, address);
+ if (!pud_present(*pud))
+ return NULL;
+ pmd = pmd_offset(pud, address);
+
*ptl = pmd_lock(mm, pmd);
- if (pmd_none(*pmd))
+ if (!pmd_present(*pmd))
goto unlock;
if (pmd_page(*pmd) != page)
goto unlock;
@@ -1966,17 +1898,22 @@ out:
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:
+#ifdef CONFIG_S390
+ /*
+ * qemu blindly sets MADV_HUGEPAGE on all allocations, but s390
+ * can't handle this properly after s390_enable_sie, so we simply
+ * ignore the madvise to prevent qemu from causing a SIGSEGV.
+ */
+ if (mm_has_pgste(vma->vm_mm))
+ return 0;
+#endif
/*
* Be somewhat over-protective like KSM for now!
*/
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;
/*
@@ -2429,7 +2366,7 @@ static void collapse_huge_page(struct mm_struct *mm,
if (!new_page)
return;
- if (unlikely(mem_cgroup_newpage_charge(new_page, mm, GFP_KERNEL)))
+ if (unlikely(mem_cgroup_charge_anon(new_page, mm, GFP_KERNEL)))
return;
/*