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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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