[PATCH] overcommit: use totalreserve_pages for nommu

[safe/jmp/linux-2.6] / mm / nommu.c

diff --git a/mm/nommu.c b/mm/nommu.c
index 5999248..029fada 100644 (file)
--- a/mm/nommu.c
+++ b/mm/nommu.c
@@ -44,10 +44,6 @@ int sysctl_max_map_count = DEFAULT_MAX_MAP_COUNT;
 int heap_stack_gap = 0;
 
 EXPORT_SYMBOL(mem_map);
-EXPORT_SYMBOL(sysctl_max_map_count);
-EXPORT_SYMBOL(sysctl_overcommit_memory);
-EXPORT_SYMBOL(sysctl_overcommit_ratio);
-EXPORT_SYMBOL(vm_committed_space);
 EXPORT_SYMBOL(__vm_enough_memory);
 
 /* list of shareable VMAs */
@@ -57,10 +53,11 @@ DECLARE_RWSEM(nommu_vma_sem);
 struct vm_operations_struct generic_file_vm_ops = {
 };
 
-EXPORT_SYMBOL(vmalloc);
 EXPORT_SYMBOL(vfree);
 EXPORT_SYMBOL(vmalloc_to_page);
 EXPORT_SYMBOL(vmalloc_32);
+EXPORT_SYMBOL(vmap);
+EXPORT_SYMBOL(vunmap);
 
 /*
  * Handle all mappings that got truncated by a "truncate()"
@@ -162,7 +159,7 @@ void *__vmalloc(unsigned long size, gfp_t gfp_mask, pgprot_t prot)
        /*
         * kmalloc doesn't like __GFP_HIGHMEM for some reason
         */
-       return kmalloc(size, gfp_mask & ~__GFP_HIGHMEM);
+       return kmalloc(size, (gfp_mask | __GFP_COMP) & ~__GFP_HIGHMEM);
 }
 
 struct page * vmalloc_to_page(void *addr)
@@ -207,6 +204,13 @@ void *vmalloc(unsigned long size)
 {
        return __vmalloc(size, GFP_KERNEL | __GFP_HIGHMEM, PAGE_KERNEL);
 }
+EXPORT_SYMBOL(vmalloc);
+
+void *vmalloc_node(unsigned long size, int node)
+{
+       return vmalloc(size);
+}
+EXPORT_SYMBOL(vmalloc_node);
 
 /*
  *     vmalloc_32  -  allocate virtually continguos memory (32bit addressable)
@@ -619,7 +623,7 @@ static int do_mmap_private(struct vm_area_struct *vma, unsigned long len)
         * - note that this may not return a page-aligned address if the object
         *   we're allocating is smaller than a page
         */
-       base = kmalloc(len, GFP_KERNEL);
+       base = kmalloc(len, GFP_KERNEL|__GFP_COMP);
        if (!base)
                goto enomem;
 
@@ -931,6 +935,8 @@ int do_munmap(struct mm_struct *mm, unsigned long addr, size_t len)
        realalloc -= kobjsize(vml);
        askedalloc -= sizeof(*vml);
        kfree(vml);
+
+       update_hiwater_vm(mm);
        mm->total_vm -= len >> PAGE_SHIFT;
 
 #ifdef DEBUG
@@ -1047,7 +1053,8 @@ struct vm_area_struct *find_vma(struct mm_struct *mm, unsigned long addr)
 
 EXPORT_SYMBOL(find_vma);
 
-struct page * follow_page(struct mm_struct *mm, unsigned long addr, int write)
+struct page *follow_page(struct vm_area_struct *vma, unsigned long address,
+                       unsigned int foll_flags)
 {
        return NULL;
 }
@@ -1078,19 +1085,6 @@ void arch_unmap_area(struct mm_struct *mm, unsigned long addr)
 {
 }
 
-void update_mem_hiwater(struct task_struct *tsk)
-{
-       unsigned long rss;
-
-       if (likely(tsk->mm)) {
-               rss = get_mm_rss(tsk->mm);
-               if (tsk->mm->hiwater_rss < rss)
-                       tsk->mm->hiwater_rss = rss;
-               if (tsk->mm->hiwater_vm < tsk->mm->total_vm)
-                       tsk->mm->hiwater_vm = tsk->mm->total_vm;
-       }
-}
-
 void unmap_mapping_range(struct address_space *mapping,
                         loff_t const holebegin, loff_t const holelen,
                         int even_cows)
@@ -1153,14 +1147,26 @@ int __vm_enough_memory(long pages, int cap_sys_admin)
                 * only call if we're about to fail.
                 */
                n = nr_free_pages();
+
+               /*
+                * Leave reserved pages. The pages are not for anonymous pages.
+                */
+               if (n <= totalreserve_pages)
+                       goto error;
+               else
+                       n -= totalreserve_pages;
+
+               /*
+                * Leave the last 3% for root
+                */
                if (!cap_sys_admin)
                        n -= n / 32;
                free += n;
 
                if (free > pages)
                        return 0;
-               vm_unacct_memory(pages);
-               return -ENOMEM;
+
+               goto error;
        }
 
        allowed = totalram_pages * sysctl_overcommit_ratio / 100;
@@ -1181,7 +1187,7 @@ int __vm_enough_memory(long pages, int cap_sys_admin)
         */
        if (atomic_read(&vm_committed_space) < (long)allowed)
                return 0;
-
+error:
        vm_unacct_memory(pages);
 
        return -ENOMEM;
@@ -1191,3 +1197,10 @@ int in_gate_area_no_task(unsigned long addr)
 {
        return 0;
 }
+
+struct page *filemap_nopage(struct vm_area_struct *area,
+                       unsigned long address, int *type)
+{
+       BUG();
+       return NULL;
+}