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    Subject[RFC][PATCH 11/26] mm, mpol: Lazy migrate a process/vma
    Provide simple functions to lazy migrate a process (or part thereof).
    These will be used to implement memory migration for NUMA process
    migration.

    Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
    ---
    include/linux/mempolicy.h | 3 +++
    mm/mempolicy.c | 40 ++++++++++++++++++++++++++++++++++++++++
    2 files changed, 43 insertions(+)
    --- a/include/linux/mempolicy.h
    +++ b/include/linux/mempolicy.h
    @@ -250,6 +250,9 @@ extern int vma_migratable(struct vm_area

    extern int mpol_misplaced(struct page *, struct vm_area_struct *, unsigned long);

    +extern void lazy_migrate_vma(struct vm_area_struct *vma, int node);
    +extern void lazy_migrate_process(struct mm_struct *mm, int node);
    +
    #else

    struct mempolicy {};
    --- a/mm/mempolicy.c
    +++ b/mm/mempolicy.c
    @@ -1173,6 +1173,46 @@ static long do_mbind(unsigned long start
    return err;
    }

    +void lazy_migrate_vma(struct vm_area_struct *vma, int node)
    +{
    + nodemask_t nmask = nodemask_of_node(node);
    + LIST_HEAD(pagelist);
    +
    + struct mempol_walk_data data = {
    + .nodes = &nmask,
    + .flags = MPOL_MF_MOVE | MPOL_MF_INVERT, /* move all pages not in set */
    + .private = &pagelist,
    + .vma = vma,
    + };
    +
    + struct mm_walk walk = {
    + .pte_entry = check_pte_entry,
    + .mm = vma->vm_mm,
    + .private = &data,
    + };
    +
    + if (vma->vm_file)
    + return;
    +
    + if (!vma_migratable(vma))
    + return;
    +
    + if (!walk_page_range(vma->vm_start, vma->vm_end, &walk))
    + migrate_pages_unmap_only(&pagelist);
    +
    + putback_lru_pages(&pagelist);
    +}
    +
    +void lazy_migrate_process(struct mm_struct *mm, int node)
    +{
    + struct vm_area_struct *vma;
    +
    + down_read(&mm->mmap_sem);
    + for (vma = mm->mmap; vma; vma = vma->vm_next)
    + lazy_migrate_vma(vma, node);
    + up_read(&mm->mmap_sem);
    +}
    +
    /*
    * User space interface with variable sized bitmaps for nodelists.
    */



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