From 0a450bbc6181cf8aa9af5c4190cf91fa85ef4df6 Mon Sep 17 00:00:00 2001
From: Christian Heinrich <franz-christian.heinrich@inria.fr>
Date: Thu, 15 Feb 2018 15:08:19 +0100
Subject: [PATCH] [DVFS] Add function sg_host_get_idle_time(host)

---
 include/simgrid/plugins/load.h |  1 +
 src/surf/plugins/host_load.cpp | 20 ++++++++++++++++++++
 2 files changed, 21 insertions(+)

diff --git a/include/simgrid/plugins/load.h b/include/simgrid/plugins/load.h
index 3d1c940f7b..2fb2a94c89 100644
--- a/include/simgrid/plugins/load.h
+++ b/include/simgrid/plugins/load.h
@@ -14,6 +14,7 @@ SG_BEGIN_DECL()
 
 XBT_PUBLIC(void) sg_host_load_plugin_init();
 XBT_PUBLIC(double) sg_host_get_current_load(sg_host_t host);
+XBT_PUBLIC(double) sg_host_get_idle_time(sg_host_t host);
 XBT_PUBLIC(double) sg_host_get_computed_flops(sg_host_t host);
 XBT_PUBLIC(void) sg_host_load_reset(sg_host_t host);
 
diff --git a/src/surf/plugins/host_load.cpp b/src/surf/plugins/host_load.cpp
index 6845b07130..f353661d25 100644
--- a/src/surf/plugins/host_load.cpp
+++ b/src/surf/plugins/host_load.cpp
@@ -37,6 +37,7 @@ public:
   double getCurrentLoad();
   double getComputedFlops();
   double getAverageLoad();
+  double getIdleTime();
   void update();
   void reset();
 
@@ -86,6 +87,13 @@ double HostLoad::getCurrentLoad()
   return current_flops / static_cast<double>(host->getSpeed() * host->getCoreCount());
 }
 
+/**
+ * Return idle time since last reset
+ */
+double HostLoad::getIdleTime() {
+  return idle_time;
+}
+
 double HostLoad::getAverageLoad()
 {
   return getComputedFlops() / (host->getSpeed() * host->getCoreCount() * (surf_get_clock() - last_reset));
@@ -177,6 +185,18 @@ double sg_host_get_current_load(sg_host_t host)
   return host->extension<HostLoad>()->getCurrentLoad();
 }
 
+/** @brief Returns the time this host was idle since the last reset
+ *
+ *  See also @ref plugin_load
+ */
+double sg_host_get_idle_time(sg_host_t host)
+{
+  xbt_assert(HostLoad::EXTENSION_ID.valid(),
+             "The Load plugin is not active. Please call sg_host_load_plugin_init() during initialization.");
+
+  return host->extension<HostLoad>()->getIdleTime();
+}
+
 double sg_host_get_computed_flops(sg_host_t host)
 {
   xbt_assert(HostLoad::EXTENSION_ID.valid(),
-- 
2.20.1