mm: per-thread vma caching

[platform/adaptation/renesas_rcar/renesas_kernel.git] / mm / mmap.c

diff --git a/mm/mmap.c b/mm/mmap.c
index 20ff0c3..dfe9065 100644 (file)
--- a/mm/mmap.c
+++ b/mm/mmap.c
@@ -10,6 +10,7 @@
 #include <linux/slab.h>
 #include <linux/backing-dev.h>
 #include <linux/mm.h>
+#include <linux/vmacache.h>
 #include <linux/shm.h>
 #include <linux/mman.h>
 #include <linux/pagemap.h>
@@ -681,8 +682,9 @@ __vma_unlink(struct mm_struct *mm, struct vm_area_struct *vma,
        prev->vm_next = next = vma->vm_next;
        if (next)
                next->vm_prev = prev;
-       if (mm->mmap_cache == vma)
-               mm->mmap_cache = prev;
+
+       /* Kill the cache */
+       vmacache_invalidate(mm);
 }
 
 /*
@@ -1989,34 +1991,33 @@ EXPORT_SYMBOL(get_unmapped_area);
 /* Look up the first VMA which satisfies  addr < vm_end,  NULL if none. */
 struct vm_area_struct *find_vma(struct mm_struct *mm, unsigned long addr)
 {
-       struct vm_area_struct *vma = NULL;
+       struct rb_node *rb_node;
+       struct vm_area_struct *vma;
 
        /* Check the cache first. */
-       /* (Cache hit rate is typically around 35%.) */
-       vma = ACCESS_ONCE(mm->mmap_cache);
-       if (!(vma && vma->vm_end > addr && vma->vm_start <= addr)) {
-               struct rb_node *rb_node;
+       vma = vmacache_find(mm, addr);
+       if (likely(vma))
+               return vma;
 
-               rb_node = mm->mm_rb.rb_node;
-               vma = NULL;
+       rb_node = mm->mm_rb.rb_node;
+       vma = NULL;
 
-               while (rb_node) {
-                       struct vm_area_struct *vma_tmp;
-
-                       vma_tmp = rb_entry(rb_node,
-                                          struct vm_area_struct, vm_rb);
-
-                       if (vma_tmp->vm_end > addr) {
-                               vma = vma_tmp;
-                               if (vma_tmp->vm_start <= addr)
-                                       break;
-                               rb_node = rb_node->rb_left;
-                       } else
-                               rb_node = rb_node->rb_right;
-               }
-               if (vma)
-                       mm->mmap_cache = vma;
+       while (rb_node) {
+               struct vm_area_struct *tmp;
+
+               tmp = rb_entry(rb_node, struct vm_area_struct, vm_rb);
+
+               if (tmp->vm_end > addr) {
+                       vma = tmp;
+                       if (tmp->vm_start <= addr)
+                               break;
+                       rb_node = rb_node->rb_left;
+               } else
+                       rb_node = rb_node->rb_right;
        }
+
+       if (vma)
+               vmacache_update(addr, vma);
        return vma;
 }
 
@@ -2388,7 +2389,9 @@ detach_vmas_to_be_unmapped(struct mm_struct *mm, struct vm_area_struct *vma,
        } else
                mm->highest_vm_end = prev ? prev->vm_end : 0;
        tail_vma->vm_next = NULL;
-       mm->mmap_cache = NULL;          /* Kill the cache. */
+
+       /* Kill the cache */
+       vmacache_invalidate(mm);
 }
 
 /*