From e349935139d993af3ad26a1cda30cce8dbf794ac Mon Sep 17 00:00:00 2001
From: "Bjoern B. Brandenburg" <bbb@cs.unc.edu>
Date: Wed, 22 Sep 2010 17:42:26 -0400
Subject: Litmus core: add budget_remaining() helper

Returns the amount of budget left for a given job.
---
 include/litmus/litmus.h | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/include/litmus/litmus.h b/include/litmus/litmus.h
index 674528eece14..ba6c5381e151 100644
--- a/include/litmus/litmus.h
+++ b/include/litmus/litmus.h
@@ -85,6 +85,14 @@ 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)
+{
+	/* This overflows if called when there is no budget remaining. */
+	BUG_ON(budget_exhausted(t));
+
+	return get_exec_cost(t) - get_exec_time(t);
+}
+
 #define budget_enforced(t) (tsk_rt(t)->task_params.budget_policy != NO_ENFORCEMENT)
 
 
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