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SubjectRe: [PATCHv2 1/2] mm: Introduce wrappers to access mm->nr_ptes
On Thu 05-10-17 13:14:41, Kirill A. Shutemov wrote:
> Let's add wrappers for ->nr_ptes with the same interface as for nr_pmd
> and nr_pud.
>
> It's preparation for consolidation of page-table counters in mm_struct.

You are also making the accounting dependent on MMU which is OK because
no nommu arch really accounts page tables if there is anything like that
at all on those archs but it should be mentioned in the changelog.

> Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>

Acked-by: Michal Hocko <mhocko@suse.com>

> ---
> arch/arm/mm/pgd.c | 2 +-
> arch/sparc/mm/hugetlbpage.c | 2 +-
> arch/unicore32/mm/pgd.c | 2 +-
> fs/proc/task_mmu.c | 2 +-
> include/linux/mm.h | 32 ++++++++++++++++++++++++++++++++
> include/linux/mm_types.h | 2 ++
> kernel/fork.c | 6 +++---
> mm/debug.c | 2 +-
> mm/huge_memory.c | 10 +++++-----
> mm/khugepaged.c | 2 +-
> mm/memory.c | 8 ++++----
> mm/oom_kill.c | 5 ++---
> 12 files changed, 54 insertions(+), 21 deletions(-)
>
> diff --git a/arch/arm/mm/pgd.c b/arch/arm/mm/pgd.c
> index c1c1a5c67da1..61e281cb29fb 100644
> --- a/arch/arm/mm/pgd.c
> +++ b/arch/arm/mm/pgd.c
> @@ -141,7 +141,7 @@ void pgd_free(struct mm_struct *mm, pgd_t *pgd_base)
> pte = pmd_pgtable(*pmd);
> pmd_clear(pmd);
> pte_free(mm, pte);
> - atomic_long_dec(&mm->nr_ptes);
> + mm_dec_nr_ptes(mm);
> no_pmd:
> pud_clear(pud);
> pmd_free(mm, pmd);
> diff --git a/arch/sparc/mm/hugetlbpage.c b/arch/sparc/mm/hugetlbpage.c
> index fd0d85808828..29fa5967b7d2 100644
> --- a/arch/sparc/mm/hugetlbpage.c
> +++ b/arch/sparc/mm/hugetlbpage.c
> @@ -396,7 +396,7 @@ static void hugetlb_free_pte_range(struct mmu_gather *tlb, pmd_t *pmd,
>
> pmd_clear(pmd);
> pte_free_tlb(tlb, token, addr);
> - atomic_long_dec(&tlb->mm->nr_ptes);
> + mm_dec_nr_ptes(tlb->mm);
> }
>
> static void hugetlb_free_pmd_range(struct mmu_gather *tlb, pud_t *pud,
> diff --git a/arch/unicore32/mm/pgd.c b/arch/unicore32/mm/pgd.c
> index c572a28c76c9..a830a300aaa1 100644
> --- a/arch/unicore32/mm/pgd.c
> +++ b/arch/unicore32/mm/pgd.c
> @@ -97,7 +97,7 @@ void free_pgd_slow(struct mm_struct *mm, pgd_t *pgd)
> pte = pmd_pgtable(*pmd);
> pmd_clear(pmd);
> pte_free(mm, pte);
> - atomic_long_dec(&mm->nr_ptes);
> + mm_dec_nr_ptes(mm);
> pmd_free(mm, pmd);
> mm_dec_nr_pmds(mm);
> free:
> diff --git a/fs/proc/task_mmu.c b/fs/proc/task_mmu.c
> index 627de66204bd..84c262d5197a 100644
> --- a/fs/proc/task_mmu.c
> +++ b/fs/proc/task_mmu.c
> @@ -49,7 +49,7 @@ void task_mem(struct seq_file *m, struct mm_struct *mm)
> text = (PAGE_ALIGN(mm->end_code) - (mm->start_code & PAGE_MASK)) >> 10;
> lib = (mm->exec_vm << (PAGE_SHIFT-10)) - text;
> swap = get_mm_counter(mm, MM_SWAPENTS);
> - ptes = PTRS_PER_PTE * sizeof(pte_t) * atomic_long_read(&mm->nr_ptes);
> + ptes = PTRS_PER_PTE * sizeof(pte_t) * mm_nr_ptes(mm);
> pmds = PTRS_PER_PMD * sizeof(pmd_t) * mm_nr_pmds(mm);
> puds = PTRS_PER_PUD * sizeof(pud_t) * mm_nr_puds(mm);
> seq_printf(m,
> diff --git a/include/linux/mm.h b/include/linux/mm.h
> index 5125c51c9c35..e185dcdc5183 100644
> --- a/include/linux/mm.h
> +++ b/include/linux/mm.h
> @@ -1679,6 +1679,38 @@ static inline void mm_dec_nr_pmds(struct mm_struct *mm)
> }
> #endif
>
> +#ifdef CONFIG_MMU
> +static inline void mm_nr_ptes_init(struct mm_struct *mm)
> +{
> + atomic_long_set(&mm->nr_ptes, 0);
> +}
> +
> +static inline unsigned long mm_nr_ptes(const struct mm_struct *mm)
> +{
> + return atomic_long_read(&mm->nr_ptes);
> +}
> +
> +static inline void mm_inc_nr_ptes(struct mm_struct *mm)
> +{
> + atomic_long_inc(&mm->nr_ptes);
> +}
> +
> +static inline void mm_dec_nr_ptes(struct mm_struct *mm)
> +{
> + atomic_long_dec(&mm->nr_ptes);
> +}
> +#else
> +static inline void mm_nr_ptes_init(struct mm_struct *mm) {}
> +
> +static inline unsigned long mm_nr_ptes(const struct mm_struct *mm)
> +{
> + return 0;
> +}
> +
> +static inline void mm_inc_nr_ptes(struct mm_struct *mm) {}
> +static inline void mm_dec_nr_ptes(struct mm_struct *mm) {}
> +#endif
> +
> int __pte_alloc(struct mm_struct *mm, pmd_t *pmd, unsigned long address);
> int __pte_alloc_kernel(pmd_t *pmd, unsigned long address);
>
> diff --git a/include/linux/mm_types.h b/include/linux/mm_types.h
> index 6c8c2bb9e5a1..95d0eefe1f4a 100644
> --- a/include/linux/mm_types.h
> +++ b/include/linux/mm_types.h
> @@ -398,7 +398,9 @@ struct mm_struct {
> */
> atomic_t mm_count;
>
> +#ifdef CONFIG_MMU
> atomic_long_t nr_ptes; /* PTE page table pages */
> +#endif
> #if CONFIG_PGTABLE_LEVELS > 2
> atomic_long_t nr_pmds; /* PMD page table pages */
> #endif
> diff --git a/kernel/fork.c b/kernel/fork.c
> index 5624918154db..d466181902cf 100644
> --- a/kernel/fork.c
> +++ b/kernel/fork.c
> @@ -813,7 +813,7 @@ static struct mm_struct *mm_init(struct mm_struct *mm, struct task_struct *p,
> init_rwsem(&mm->mmap_sem);
> INIT_LIST_HEAD(&mm->mmlist);
> mm->core_state = NULL;
> - atomic_long_set(&mm->nr_ptes, 0);
> + mm_nr_ptes_init(mm);
> mm_nr_pmds_init(mm);
> mm_nr_puds_init(mm);
> mm->map_count = 0;
> @@ -869,9 +869,9 @@ static void check_mm(struct mm_struct *mm)
> "mm:%p idx:%d val:%ld\n", mm, i, x);
> }
>
> - if (atomic_long_read(&mm->nr_ptes))
> + if (mm_nr_ptes(mm))
> pr_alert("BUG: non-zero nr_ptes on freeing mm: %ld\n",
> - atomic_long_read(&mm->nr_ptes));
> + mm_nr_ptes(mm));
> if (mm_nr_pmds(mm))
> pr_alert("BUG: non-zero nr_pmds on freeing mm: %ld\n",
> mm_nr_pmds(mm));
> diff --git a/mm/debug.c b/mm/debug.c
> index afccb2565269..177326818d24 100644
> --- a/mm/debug.c
> +++ b/mm/debug.c
> @@ -135,7 +135,7 @@ void dump_mm(const struct mm_struct *mm)
> mm->mmap_base, mm->mmap_legacy_base, mm->highest_vm_end,
> mm->pgd, atomic_read(&mm->mm_users),
> atomic_read(&mm->mm_count),
> - atomic_long_read((atomic_long_t *)&mm->nr_ptes),
> + mm_nr_ptes(mm),
> mm_nr_pmds(mm),
> mm_nr_puds(mm),
> mm->map_count,
> diff --git a/mm/huge_memory.c b/mm/huge_memory.c
> index 269b5df58543..c037d3d34950 100644
> --- a/mm/huge_memory.c
> +++ b/mm/huge_memory.c
> @@ -606,7 +606,7 @@ static int __do_huge_pmd_anonymous_page(struct vm_fault *vmf, struct page *page,
> pgtable_trans_huge_deposit(vma->vm_mm, vmf->pmd, pgtable);
> set_pmd_at(vma->vm_mm, haddr, vmf->pmd, entry);
> add_mm_counter(vma->vm_mm, MM_ANONPAGES, HPAGE_PMD_NR);
> - atomic_long_inc(&vma->vm_mm->nr_ptes);
> + mm_inc_nr_ptes(vma->vm_mm);
> spin_unlock(vmf->ptl);
> count_vm_event(THP_FAULT_ALLOC);
> }
> @@ -662,7 +662,7 @@ static bool set_huge_zero_page(pgtable_t pgtable, struct mm_struct *mm,
> if (pgtable)
> pgtable_trans_huge_deposit(mm, pmd, pgtable);
> set_pmd_at(mm, haddr, pmd, entry);
> - atomic_long_inc(&mm->nr_ptes);
> + mm_inc_nr_ptes(mm);
> return true;
> }
>
> @@ -747,7 +747,7 @@ static void insert_pfn_pmd(struct vm_area_struct *vma, unsigned long addr,
>
> if (pgtable) {
> pgtable_trans_huge_deposit(mm, pmd, pgtable);
> - atomic_long_inc(&mm->nr_ptes);
> + mm_inc_nr_ptes(mm);
> }
>
> set_pmd_at(mm, addr, pmd, entry);
> @@ -975,7 +975,7 @@ int copy_huge_pmd(struct mm_struct *dst_mm, struct mm_struct *src_mm,
> get_page(src_page);
> page_dup_rmap(src_page, true);
> add_mm_counter(dst_mm, MM_ANONPAGES, HPAGE_PMD_NR);
> - atomic_long_inc(&dst_mm->nr_ptes);
> + mm_inc_nr_ptes(dst_mm);
> pgtable_trans_huge_deposit(dst_mm, dst_pmd, pgtable);
>
> pmdp_set_wrprotect(src_mm, addr, src_pmd);
> @@ -1675,7 +1675,7 @@ static inline void zap_deposited_table(struct mm_struct *mm, pmd_t *pmd)
>
> pgtable = pgtable_trans_huge_withdraw(mm, pmd);
> pte_free(mm, pgtable);
> - atomic_long_dec(&mm->nr_ptes);
> + mm_dec_nr_ptes(mm);
> }
>
> int zap_huge_pmd(struct mmu_gather *tlb, struct vm_area_struct *vma,
> diff --git a/mm/khugepaged.c b/mm/khugepaged.c
> index c01f177a1120..9e36fe8857d9 100644
> --- a/mm/khugepaged.c
> +++ b/mm/khugepaged.c
> @@ -1269,7 +1269,7 @@ static void retract_page_tables(struct address_space *mapping, pgoff_t pgoff)
> _pmd = pmdp_collapse_flush(vma, addr, pmd);
> spin_unlock(ptl);
> up_write(&vma->vm_mm->mmap_sem);
> - atomic_long_dec(&vma->vm_mm->nr_ptes);
> + mm_dec_nr_ptes(vma->vm_mm);
> pte_free(vma->vm_mm, pmd_pgtable(_pmd));
> }
> }
> diff --git a/mm/memory.c b/mm/memory.c
> index 291d4984b417..c443456dbd02 100644
> --- a/mm/memory.c
> +++ b/mm/memory.c
> @@ -438,7 +438,7 @@ static void free_pte_range(struct mmu_gather *tlb, pmd_t *pmd,
> pgtable_t token = pmd_pgtable(*pmd);
> pmd_clear(pmd);
> pte_free_tlb(tlb, token, addr);
> - atomic_long_dec(&tlb->mm->nr_ptes);
> + mm_dec_nr_ptes(tlb->mm);
> }
>
> static inline void free_pmd_range(struct mmu_gather *tlb, pud_t *pud,
> @@ -666,7 +666,7 @@ int __pte_alloc(struct mm_struct *mm, pmd_t *pmd, unsigned long address)
>
> ptl = pmd_lock(mm, pmd);
> if (likely(pmd_none(*pmd))) { /* Has another populated it ? */
> - atomic_long_inc(&mm->nr_ptes);
> + mm_inc_nr_ptes(mm);
> pmd_populate(mm, pmd, new);
> new = NULL;
> }
> @@ -3213,7 +3213,7 @@ static int pte_alloc_one_map(struct vm_fault *vmf)
> goto map_pte;
> }
>
> - atomic_long_inc(&vma->vm_mm->nr_ptes);
> + mm_inc_nr_ptes(vma->vm_mm);
> pmd_populate(vma->vm_mm, vmf->pmd, vmf->prealloc_pte);
> spin_unlock(vmf->ptl);
> vmf->prealloc_pte = NULL;
> @@ -3272,7 +3272,7 @@ static void deposit_prealloc_pte(struct vm_fault *vmf)
> * We are going to consume the prealloc table,
> * count that as nr_ptes.
> */
> - atomic_long_inc(&vma->vm_mm->nr_ptes);
> + mm_inc_nr_ptes(vma->vm_mm);
> vmf->prealloc_pte = NULL;
> }
>
> diff --git a/mm/oom_kill.c b/mm/oom_kill.c
> index 4bee6968885d..851a0eec2624 100644
> --- a/mm/oom_kill.c
> +++ b/mm/oom_kill.c
> @@ -200,8 +200,7 @@ unsigned long oom_badness(struct task_struct *p, struct mem_cgroup *memcg,
> * task's rss, pagetable and swap space use.
> */
> points = get_mm_rss(p->mm) + get_mm_counter(p->mm, MM_SWAPENTS) +
> - atomic_long_read(&p->mm->nr_ptes) + mm_nr_pmds(p->mm) +
> - mm_nr_puds(p->mm);
> + mm_nr_ptes(p->mm) + mm_nr_pmds(p->mm) + mm_nr_puds(p->mm);
> task_unlock(p);
>
> /*
> @@ -396,7 +395,7 @@ static void dump_tasks(struct mem_cgroup *memcg, const nodemask_t *nodemask)
> pr_info("[%5d] %5d %5d %8lu %8lu %7ld %7ld %7ld %8lu %5hd %s\n",
> task->pid, from_kuid(&init_user_ns, task_uid(task)),
> task->tgid, task->mm->total_vm, get_mm_rss(task->mm),
> - atomic_long_read(&task->mm->nr_ptes),
> + mm_nr_ptes(task->mm),
> mm_nr_pmds(task->mm),
> mm_nr_puds(task->mm),
> get_mm_counter(task->mm, MM_SWAPENTS),
> --
> 2.14.2

--
Michal Hocko
SUSE Labs

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