x86, bts: memory accounting

[linux-2.6-omap-h63xx.git] / mm / mlock.c

diff --git a/mm/mlock.c b/mm/mlock.c
index 1ada366570cb535e4a281f7d526829c708f320f3..3035a56e7616d61a63d1f7fea916091794ca4a28 100644 (file)
--- a/mm/mlock.c
+++ b/mm/mlock.c
@@ -667,3 +667,48 @@ void user_shm_unlock(size_t size, struct user_struct *user)
        spin_unlock(&shmlock_user_lock);
        free_uid(user);
 }
+
+void *alloc_locked_buffer(size_t size)
+{
+       unsigned long rlim, vm, pgsz;
+       void *buffer = NULL;
+
+       pgsz = PAGE_ALIGN(size) >> PAGE_SHIFT;
+
+       down_write(&current->mm->mmap_sem);
+
+       rlim = current->signal->rlim[RLIMIT_AS].rlim_cur >> PAGE_SHIFT;
+       vm   = current->mm->total_vm + pgsz;
+       if (rlim < vm)
+               goto out;
+
+       rlim = current->signal->rlim[RLIMIT_MEMLOCK].rlim_cur >> PAGE_SHIFT;
+       vm   = current->mm->locked_vm + pgsz;
+       if (rlim < vm)
+               goto out;
+
+       buffer = kzalloc(size, GFP_KERNEL);
+       if (!buffer)
+               goto out;
+
+       current->mm->total_vm  += pgsz;
+       current->mm->locked_vm += pgsz;
+
+ out:
+       up_write(&current->mm->mmap_sem);
+       return buffer;
+}
+
+void free_locked_buffer(void *buffer, size_t size)
+{
+       unsigned long pgsz = PAGE_ALIGN(size) >> PAGE_SHIFT;
+
+       down_write(&current->mm->mmap_sem);
+
+       current->mm->total_vm  -= pgsz;
+       current->mm->locked_vm -= pgsz;
+
+       up_write(&current->mm->mmap_sem);
+
+       kfree(buffer);
+}