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Date: Wed, 17 Jul 2019 15:14:04 -0700 (PDT)
From: Hugh Dickins <hughd@...gle.com>
To: Yang Shi <yang.shi@...ux.alibaba.com>
cc: hughd@...gle.com, kirill.shutemov@...ux.intel.com, mhocko@...e.com,
vbabka@...e.cz, rientjes@...gle.com, akpm@...ux-foundation.org,
linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: Re: [v4 PATCH 1/2] mm: thp: make transhuge_vma_suitable available
for anonymous THP
On Thu, 18 Jul 2019, Yang Shi wrote:
> The transhuge_vma_suitable() was only available for shmem THP, but
> anonymous THP has the same check except pgoff check. And, it will be
> used for THP eligible check in the later patch, so make it available for
> all kind of THPs. This also helps reduce code duplication slightly.
>
> Since anonymous THP doesn't have to check pgoff, so make pgoff check
> shmem vma only.
>
> And regroup some functions in include/linux/mm.h to solve compile issue since
> transhuge_vma_suitable() needs call vma_is_anonymous() which was defined
> after huge_mm.h is included.
>
> Cc: Hugh Dickins <hughd@...gle.com>
Thanks!
Acked-by: Hugh Dickins <hughd@...gle.com>
> Cc: Kirill A. Shutemov <kirill.shutemov@...ux.intel.com>
> Cc: Michal Hocko <mhocko@...e.com>
> Cc: Vlastimil Babka <vbabka@...e.cz>
> Cc: David Rientjes <rientjes@...gle.com>
> Signed-off-by: Yang Shi <yang.shi@...ux.alibaba.com>
> ---
> include/linux/huge_mm.h | 23 +++++++++++++++++++++++
> include/linux/mm.h | 34 +++++++++++++++++-----------------
> mm/huge_memory.c | 2 +-
> mm/memory.c | 13 -------------
> 4 files changed, 41 insertions(+), 31 deletions(-)
>
> diff --git a/include/linux/huge_mm.h b/include/linux/huge_mm.h
> index 7cd5c15..45ede62 100644
> --- a/include/linux/huge_mm.h
> +++ b/include/linux/huge_mm.h
> @@ -121,6 +121,23 @@ static inline bool __transparent_hugepage_enabled(struct vm_area_struct *vma)
>
> bool transparent_hugepage_enabled(struct vm_area_struct *vma);
>
> +#define HPAGE_CACHE_INDEX_MASK (HPAGE_PMD_NR - 1)
> +
> +static inline bool transhuge_vma_suitable(struct vm_area_struct *vma,
> + unsigned long haddr)
> +{
> + /* Don't have to check pgoff for anonymous vma */
> + if (!vma_is_anonymous(vma)) {
> + if (((vma->vm_start >> PAGE_SHIFT) & HPAGE_CACHE_INDEX_MASK) !=
> + (vma->vm_pgoff & HPAGE_CACHE_INDEX_MASK))
> + return false;
> + }
> +
> + if (haddr < vma->vm_start || haddr + HPAGE_PMD_SIZE > vma->vm_end)
> + return false;
> + return true;
> +}
> +
> #define transparent_hugepage_use_zero_page() \
> (transparent_hugepage_flags & \
> (1<<TRANSPARENT_HUGEPAGE_USE_ZERO_PAGE_FLAG))
> @@ -271,6 +288,12 @@ static inline bool transparent_hugepage_enabled(struct vm_area_struct *vma)
> return false;
> }
>
> +static inline bool transhuge_vma_suitable(struct vm_area_struct *vma,
> + unsigned long haddr)
> +{
> + return false;
> +}
> +
> static inline void prep_transhuge_page(struct page *page) {}
>
> #define transparent_hugepage_flags 0UL
> diff --git a/include/linux/mm.h b/include/linux/mm.h
> index 0389c34..beae0ae 100644
> --- a/include/linux/mm.h
> +++ b/include/linux/mm.h
> @@ -541,6 +541,23 @@ static inline void vma_set_anonymous(struct vm_area_struct *vma)
> vma->vm_ops = NULL;
> }
>
> +static inline bool vma_is_anonymous(struct vm_area_struct *vma)
> +{
> + return !vma->vm_ops;
> +}
> +
> +#ifdef CONFIG_SHMEM
> +/*
> + * The vma_is_shmem is not inline because it is used only by slow
> + * paths in userfault.
> + */
> +bool vma_is_shmem(struct vm_area_struct *vma);
> +#else
> +static inline bool vma_is_shmem(struct vm_area_struct *vma) { return false; }
> +#endif
> +
> +int vma_is_stack_for_current(struct vm_area_struct *vma);
> +
> /* flush_tlb_range() takes a vma, not a mm, and can care about flags */
> #define TLB_FLUSH_VMA(mm,flags) { .vm_mm = (mm), .vm_flags = (flags) }
>
> @@ -1629,23 +1646,6 @@ static inline void cancel_dirty_page(struct page *page)
>
> int get_cmdline(struct task_struct *task, char *buffer, int buflen);
>
> -static inline bool vma_is_anonymous(struct vm_area_struct *vma)
> -{
> - return !vma->vm_ops;
> -}
> -
> -#ifdef CONFIG_SHMEM
> -/*
> - * The vma_is_shmem is not inline because it is used only by slow
> - * paths in userfault.
> - */
> -bool vma_is_shmem(struct vm_area_struct *vma);
> -#else
> -static inline bool vma_is_shmem(struct vm_area_struct *vma) { return false; }
> -#endif
> -
> -int vma_is_stack_for_current(struct vm_area_struct *vma);
> -
> extern unsigned long move_page_tables(struct vm_area_struct *vma,
> unsigned long old_addr, struct vm_area_struct *new_vma,
> unsigned long new_addr, unsigned long len,
> diff --git a/mm/huge_memory.c b/mm/huge_memory.c
> index 885642c..782dd14 100644
> --- a/mm/huge_memory.c
> +++ b/mm/huge_memory.c
> @@ -689,7 +689,7 @@ vm_fault_t do_huge_pmd_anonymous_page(struct vm_fault *vmf)
> struct page *page;
> unsigned long haddr = vmf->address & HPAGE_PMD_MASK;
>
> - if (haddr < vma->vm_start || haddr + HPAGE_PMD_SIZE > vma->vm_end)
> + if (!transhuge_vma_suitable(vma, haddr))
> return VM_FAULT_FALLBACK;
> if (unlikely(anon_vma_prepare(vma)))
> return VM_FAULT_OOM;
> diff --git a/mm/memory.c b/mm/memory.c
> index 89325f9..e2bb51b 100644
> --- a/mm/memory.c
> +++ b/mm/memory.c
> @@ -3162,19 +3162,6 @@ static vm_fault_t pte_alloc_one_map(struct vm_fault *vmf)
> }
>
> #ifdef CONFIG_TRANSPARENT_HUGE_PAGECACHE
> -
> -#define HPAGE_CACHE_INDEX_MASK (HPAGE_PMD_NR - 1)
> -static inline bool transhuge_vma_suitable(struct vm_area_struct *vma,
> - unsigned long haddr)
> -{
> - if (((vma->vm_start >> PAGE_SHIFT) & HPAGE_CACHE_INDEX_MASK) !=
> - (vma->vm_pgoff & HPAGE_CACHE_INDEX_MASK))
> - return false;
> - if (haddr < vma->vm_start || haddr + HPAGE_PMD_SIZE > vma->vm_end)
> - return false;
> - return true;
> -}
> -
> static void deposit_prealloc_pte(struct vm_fault *vmf)
> {
> struct vm_area_struct *vma = vmf->vma;
> --
> 1.8.3.1
>
>
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