NOMMU: Improve procfs output using per-MM VMAs

Improve procfs output using per-MM VMAs for process memory accounting.

Signed-off-by: David Howells <dhowells@redhat.com>
Tested-by: Mike Frysinger <vapier.adi@gmail.com>
Acked-by: Paul Mundt <lethal@linux-sh.org>

diff --git a/fs/proc/task_nommu.c b/fs/proc/task_nommu.c
index ca4a48d..343ea12 100644 (file)
--- a/fs/proc/task_nommu.c
+++ b/fs/proc/task_nommu.c
@@ -16,24 +16,31 @@
 void task_mem(struct seq_file *m, struct mm_struct *mm)
 {
        struct vm_area_struct *vma;
+       struct vm_region *region;
        struct rb_node *p;
-       unsigned long bytes = 0, sbytes = 0, slack = 0;
+       unsigned long bytes = 0, sbytes = 0, slack = 0, size;
         
        down_read(&mm->mmap_sem);
        for (p = rb_first(&mm->mm_rb); p; p = rb_next(p)) {
                vma = rb_entry(p, struct vm_area_struct, vm_rb);
 
                bytes += kobjsize(vma);
+
+               region = vma->vm_region;
+               if (region) {
+                       size = kobjsize(region);
+                       size += region->vm_end - region->vm_start;
+               } else {
+                       size = vma->vm_end - vma->vm_start;
+               }
+
                if (atomic_read(&mm->mm_count) > 1 ||
-                   vma->vm_region ||
                    vma->vm_flags & VM_MAYSHARE) {
-                       sbytes += kobjsize((void *) vma->vm_start);
-                       if (vma->vm_region)
-                               sbytes += kobjsize(vma->vm_region);
+                       sbytes += size;
                } else {
-                       bytes += kobjsize((void *) vma->vm_start);
-                       slack += kobjsize((void *) vma->vm_start) -
-                               (vma->vm_end - vma->vm_start);
+                       bytes += size;
+                       if (region)
+                               slack = region->vm_end - vma->vm_end;
                }
        }
 
@@ -77,7 +84,7 @@ unsigned long task_vsize(struct mm_struct *mm)
        down_read(&mm->mmap_sem);
        for (p = rb_first(&mm->mm_rb); p; p = rb_next(p)) {
                vma = rb_entry(p, struct vm_area_struct, vm_rb);
-               vsize += vma->vm_region->vm_end - vma->vm_region->vm_start;
+               vsize += vma->vm_end - vma->vm_start;
        }
        up_read(&mm->mmap_sem);
        return vsize;
@@ -87,6 +94,7 @@ int task_statm(struct mm_struct *mm, int *shared, int *text,
               int *data, int *resident)
 {
        struct vm_area_struct *vma;
+       struct vm_region *region;
        struct rb_node *p;
        int size = kobjsize(mm);
 
@@ -94,7 +102,11 @@ int task_statm(struct mm_struct *mm, int *shared, int *text,
        for (p = rb_first(&mm->mm_rb); p; p = rb_next(p)) {
                vma = rb_entry(p, struct vm_area_struct, vm_rb);
                size += kobjsize(vma);
-               size += kobjsize((void *) vma->vm_start);
+               region = vma->vm_region;
+               if (region) {
+                       size += kobjsize(region);
+                       size += region->vm_end - region->vm_start;
+               }
        }
 
        size += (*text = mm->end_code - mm->start_code);