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SubjectRe: [PATCH v12 14/31] mm/migrate: Pass vm_fault pointer to migrate_misplaced_page()
On Tue, Apr 16, 2019 at 03:45:05PM +0200, Laurent Dufour wrote:
> migrate_misplaced_page() is only called during the page fault handling so
> it's better to pass the pointer to the struct vm_fault instead of the vma.
>
> This way during the speculative page fault path the saved vma->vm_flags
> could be used.
>
> Acked-by: David Rientjes <rientjes@google.com>
> Signed-off-by: Laurent Dufour <ldufour@linux.ibm.com>

Reviewed-by: Jérôme Glisse <jglisse@redhat.com>

> ---
> include/linux/migrate.h | 4 ++--
> mm/memory.c | 2 +-
> mm/migrate.c | 4 ++--
> 3 files changed, 5 insertions(+), 5 deletions(-)
>
> diff --git a/include/linux/migrate.h b/include/linux/migrate.h
> index e13d9bf2f9a5..0197e40325f8 100644
> --- a/include/linux/migrate.h
> +++ b/include/linux/migrate.h
> @@ -125,14 +125,14 @@ static inline void __ClearPageMovable(struct page *page)
> #ifdef CONFIG_NUMA_BALANCING
> extern bool pmd_trans_migrating(pmd_t pmd);
> extern int migrate_misplaced_page(struct page *page,
> - struct vm_area_struct *vma, int node);
> + struct vm_fault *vmf, int node);
> #else
> static inline bool pmd_trans_migrating(pmd_t pmd)
> {
> return false;
> }
> static inline int migrate_misplaced_page(struct page *page,
> - struct vm_area_struct *vma, int node)
> + struct vm_fault *vmf, int node)
> {
> return -EAGAIN; /* can't migrate now */
> }
> diff --git a/mm/memory.c b/mm/memory.c
> index d0de58464479..56802850e72c 100644
> --- a/mm/memory.c
> +++ b/mm/memory.c
> @@ -3747,7 +3747,7 @@ static vm_fault_t do_numa_page(struct vm_fault *vmf)
> }
>
> /* Migrate to the requested node */
> - migrated = migrate_misplaced_page(page, vma, target_nid);
> + migrated = migrate_misplaced_page(page, vmf, target_nid);
> if (migrated) {
> page_nid = target_nid;
> flags |= TNF_MIGRATED;
> diff --git a/mm/migrate.c b/mm/migrate.c
> index a9138093a8e2..633bd9abac54 100644
> --- a/mm/migrate.c
> +++ b/mm/migrate.c
> @@ -1938,7 +1938,7 @@ bool pmd_trans_migrating(pmd_t pmd)
> * node. Caller is expected to have an elevated reference count on
> * the page that will be dropped by this function before returning.
> */
> -int migrate_misplaced_page(struct page *page, struct vm_area_struct *vma,
> +int migrate_misplaced_page(struct page *page, struct vm_fault *vmf,
> int node)
> {
> pg_data_t *pgdat = NODE_DATA(node);
> @@ -1951,7 +1951,7 @@ int migrate_misplaced_page(struct page *page, struct vm_area_struct *vma,
> * with execute permissions as they are probably shared libraries.
> */
> if (page_mapcount(page) != 1 && page_is_file_cache(page) &&
> - (vma->vm_flags & VM_EXEC))
> + (vmf->vma_flags & VM_EXEC))
> goto out;
>
> /*
> --
> 2.21.0
>

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