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    Subject[PATCH 1/1] pagemap clear_refs: modify to specify anon or mapped vma clearing

    Signed-off-by: Jared E. Hulbert <jaredeh@gmail.com>
    Signed-off-by: Moussa Ba <moussa.a.ba@gmail.com>
    --- a/fs/proc/task_mmu.c 2009-07-21 14:30:01.000000000 -0700
    +++ b/fs/proc/task_mmu.c 2009-07-21 14:32:56.000000000 -0700
    @@ -461,6 +461,33 @@
    cond_resched();
    return 0;
    }
    +static void walk_vma_area(struct mm_walk *this_walk, struct
    vm_area_struct *vma,
    + int type)
    +{
    + switch (type) {
    + /* Clear Anon VMAs only */
    + case 1:
    + if (!is_vm_hugetlb_page(vma) && !vma->vm_file)
    + walk_page_range(vma->vm_start,
    + vma->vm_end,
    + this_walk);
    + break;
    + /* Clear Mapped VMAs only */
    + case 2:
    + if (!is_vm_hugetlb_page(vma) && vma->vm_file)
    + walk_page_range(vma->vm_start,
    + vma->vm_end,
    + this_walk);
    + break;
    + /* Clear All VMAs */
    + default:
    + if (!is_vm_hugetlb_page(vma))
    + walk_page_range(vma->vm_start,
    + vma->vm_end,
    + this_walk);
    + break;
    + }
    +}

    static ssize_t clear_refs_write(struct file *file, const char __user *
    buf,
    size_t count, loff_t * ppos)
    @@ -469,13 +496,15 @@
    char buffer[PROC_NUMBUF], *end;
    struct mm_struct *mm;
    struct vm_area_struct *vma;
    + int type;

    memset(buffer, 0, sizeof(buffer));
    if (count > sizeof(buffer) - 1)
    count = sizeof(buffer) - 1;
    if (copy_from_user(buffer, buf, count))
    return -EFAULT;
    - if (!simple_strtol(buffer, &end, 0))
    + type = simple_strtol(buffer, &end, 0);
    + if (!type)
    return -EINVAL;
    if (*end == '\n')
    end++;
    @@ -491,9 +520,7 @@
    down_read(&mm->mmap_sem);
    for (vma = mm->mmap; vma; vma = vma->vm_next) {
    clear_refs_walk.private = vma;
    - if (!is_vm_hugetlb_page(vma))
    - walk_page_range(vma->vm_start, vma->vm_end,
    - &clear_refs_walk);
    + walk_vma_area(&clear_refs_walk, vma, type);
    }
    flush_tlb_mm(mm);
    up_read(&mm->mmap_sem);

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      Last update: 2009-07-24 06:07    [W:0.025 / U:30.416 seconds]
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