oom: add per-mm oom disable count

[pandora-kernel.git] / fs / proc / base.c

diff --git a/fs/proc/base.c b/fs/proc/base.c
index dc5d5f5..6e50c8e 100644 (file)
--- a/fs/proc/base.c
+++ b/fs/proc/base.c
@@ -1047,6 +1047,21 @@ static ssize_t oom_adjust_write(struct file *file, const char __user *buf,
                return -EACCES;
        }
 
+       task_lock(task);
+       if (!task->mm) {
+               task_unlock(task);
+               unlock_task_sighand(task, &flags);
+               put_task_struct(task);
+               return -EINVAL;
+       }
+
+       if (oom_adjust != task->signal->oom_adj) {
+               if (oom_adjust == OOM_DISABLE)
+                       atomic_inc(&task->mm->oom_disable_count);
+               if (task->signal->oom_adj == OOM_DISABLE)
+                       atomic_dec(&task->mm->oom_disable_count);
+       }
+
        /*
         * Warn that /proc/pid/oom_adj is deprecated, see
         * Documentation/feature-removal-schedule.txt.
@@ -1065,6 +1080,7 @@ static ssize_t oom_adjust_write(struct file *file, const char __user *buf,
        else
                task->signal->oom_score_adj = (oom_adjust * OOM_SCORE_ADJ_MAX) /
                                                                -OOM_DISABLE;
+       task_unlock(task);
        unlock_task_sighand(task, &flags);
        put_task_struct(task);
 
@@ -1133,6 +1149,19 @@ static ssize_t oom_score_adj_write(struct file *file, const char __user *buf,
                return -EACCES;
        }
 
+       task_lock(task);
+       if (!task->mm) {
+               task_unlock(task);
+               unlock_task_sighand(task, &flags);
+               put_task_struct(task);
+               return -EINVAL;
+       }
+       if (oom_score_adj != task->signal->oom_score_adj) {
+               if (oom_score_adj == OOM_SCORE_ADJ_MIN)
+                       atomic_inc(&task->mm->oom_disable_count);
+               if (task->signal->oom_score_adj == OOM_SCORE_ADJ_MIN)
+                       atomic_dec(&task->mm->oom_disable_count);
+       }
        task->signal->oom_score_adj = oom_score_adj;
        /*
         * Scale /proc/pid/oom_adj appropriately ensuring that OOM_DISABLE is
@@ -1143,6 +1172,7 @@ static ssize_t oom_score_adj_write(struct file *file, const char __user *buf,
        else
                task->signal->oom_adj = (oom_score_adj * OOM_ADJUST_MAX) /
                                                        OOM_SCORE_ADJ_MAX;
+       task_unlock(task);
        unlock_task_sighand(task, &flags);
        put_task_struct(task);
        return count;