mm,vmacache: add debug data

[mirror_ubuntu-zesty-kernel.git] / mm / vmacache.c

diff --git a/mm/vmacache.c b/mm/vmacache.c
index 1037a3bab50529f84c9d81c383df07dbfbbda081..658ed3b3e38d32a2c210d43163554cb23e6ac173 100644 (file)
--- a/mm/vmacache.c
+++ b/mm/vmacache.c
@@ -78,6 +78,8 @@ struct vm_area_struct *vmacache_find(struct mm_struct *mm, unsigned long addr)
        if (!vmacache_valid(mm))
                return NULL;
 
+       count_vm_vmacache_event(VMACACHE_FIND_CALLS);
+
        for (i = 0; i < VMACACHE_SIZE; i++) {
                struct vm_area_struct *vma = current->vmacache[i];
 
@@ -85,8 +87,10 @@ struct vm_area_struct *vmacache_find(struct mm_struct *mm, unsigned long addr)
                        continue;
                if (WARN_ON_ONCE(vma->vm_mm != mm))
                        break;
-               if (vma->vm_start <= addr && vma->vm_end > addr)
+               if (vma->vm_start <= addr && vma->vm_end > addr) {
+                       count_vm_vmacache_event(VMACACHE_FIND_HITS);
                        return vma;
+               }
        }
 
        return NULL;
@@ -102,11 +106,15 @@ struct vm_area_struct *vmacache_find_exact(struct mm_struct *mm,
        if (!vmacache_valid(mm))
                return NULL;
 
+       count_vm_vmacache_event(VMACACHE_FIND_CALLS);
+
        for (i = 0; i < VMACACHE_SIZE; i++) {
                struct vm_area_struct *vma = current->vmacache[i];
 
-               if (vma && vma->vm_start == start && vma->vm_end == end)
+               if (vma && vma->vm_start == start && vma->vm_end == end) {
+                       count_vm_vmacache_event(VMACACHE_FIND_HITS);
                        return vma;
+               }
        }
 
        return NULL;