Litmus core: add budget_remaining() helper

Quick way to figure out how much budget a LITMUS^RT job has left.

1 files changed, 9 insertions, 0 deletions

diff --git a/include/litmus/litmus.h b/include/litmus/litmus.h
index 674528eece14..69894f59c8d8 100644
--- a/include/litmus/litmus.h
+++ b/include/litmus/litmus.h
@@ -85,6 +85,15 @@ inline static int budget_exhausted(struct task_struct* t)
         return get_exec_time(t) >= get_exec_cost(t);
 }
 
+inline static lt_t budget_remaining(struct task_struct* t)
+{
+        if (!budget_exhausted(t))
+                return get_exec_time(t) - get_exec_cost(t);
+        else
+                /* avoid overflow */
+                return 0;
+}
+
 #define budget_enforced(t) (tsk_rt(t)->task_params.budget_policy != NO_ENFORCEMENT)