From f45852ab2a7126f354079499fc8b03976c0eab27 Mon Sep 17 00:00:00 2001
From: Perberos <perberos@gmail.com>
Date: Tue, 8 Nov 2011 16:22:08 -0300
Subject: initial

---
 src/smooth_refresh.cpp | 173 +++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 173 insertions(+)
 create mode 100644 src/smooth_refresh.cpp

(limited to 'src/smooth_refresh.cpp')

diff --git a/src/smooth_refresh.cpp b/src/smooth_refresh.cpp
new file mode 100644
index 0000000..f21c023
--- /dev/null
+++ b/src/smooth_refresh.cpp
@@ -0,0 +1,173 @@
+#include <config.h>
+
+#include <sys/types.h>
+#include <unistd.h>
+
+#include <glib.h>
+#include <mateconf/mateconf-client.h>
+#include <glibtop.h>
+#include <glibtop/proctime.h>
+#include <glibtop/cpu.h>
+
+#include <algorithm>
+
+#include "smooth_refresh.h"
+#include "procman.h"
+#include "util.h"
+
+
+const string SmoothRefresh::KEY("/apps/procman/smooth_refresh");
+const bool SmoothRefresh::KEY_DEFAULT_VALUE(true);
+
+
+
+unsigned SmoothRefresh::get_own_cpu_usage()
+{
+  glibtop_cpu cpu;
+  glibtop_proc_time proctime;
+  guint64 elapsed;
+  unsigned usage = PCPU_LO;
+
+  glibtop_get_cpu (&cpu);
+  elapsed = cpu.total - this->last_total_time;
+
+  if (elapsed) { // avoid division by 0
+    glibtop_get_proc_time(&proctime, getpid());
+    usage = (proctime.rtime - this->last_cpu_time) * 100 / elapsed;
+  }
+
+  usage = CLAMP(usage, 0, 100);
+
+  this->last_total_time = cpu.total;
+  this->last_cpu_time = proctime.rtime;
+
+  return usage;
+}
+
+
+
+void SmoothRefresh::status_changed(MateConfClient *client,
+				   guint cnxn_id,
+				   MateConfEntry *entry,
+				   gpointer user_data)
+{
+  static_cast<SmoothRefresh*>(user_data)->load_mateconf_value(mateconf_entry_get_value(entry));
+}
+
+void SmoothRefresh::load_mateconf_value(MateConfValue* value)
+{
+  bool own_value = false;
+
+  if (not value) {
+    value = mateconf_client_get(mateconf_client_get_default(), KEY.c_str(), NULL);
+  }
+
+  this->active = value ? mateconf_value_get_bool(value) : KEY_DEFAULT_VALUE;
+
+  if (this->active)
+    procman_debug("smooth_refresh is enabled");
+
+  if (own_value and value)
+    mateconf_value_free(value);
+}
+
+
+SmoothRefresh::SmoothRefresh()
+{
+  this->connection = mateconf_client_notify_add(mateconf_client_get_default(),
+					     KEY.c_str(),
+					     status_changed,
+					     this,
+					     NULL,
+					     NULL);
+
+  this->reset();
+  this->load_mateconf_value();
+}
+
+
+
+void SmoothRefresh::reset()
+{
+  glibtop_cpu cpu;
+  glibtop_proc_time proctime;
+
+  glibtop_get_cpu(&cpu);
+  glibtop_get_proc_time(&proctime, getpid());
+
+  this->interval = ProcData::get_instance()->config.update_interval;
+  this->last_pcpu = PCPU_LO;
+  this->last_total_time = cpu.total;
+  this->last_cpu_time = proctime.rtime;
+}
+
+
+
+SmoothRefresh::~SmoothRefresh()
+{
+  if (this->connection)
+    mateconf_client_notify_remove(mateconf_client_get_default(),
+			       this->connection);
+}
+
+
+
+bool
+SmoothRefresh::get(guint &new_interval)
+{
+  const unsigned config_interval = ProcData::get_instance()->config.update_interval;
+
+  g_assert(this->interval >= config_interval);
+
+  if (not this->active)
+    return false;
+
+
+  const unsigned pcpu = this->get_own_cpu_usage();
+  /*
+    invariant: MAX_UPDATE_INTERVAL >= interval >= config_interval >= MIN_UPDATE_INTERVAL
+
+    i see 3 cases:
+
+    a) interval is too big (CPU usage < 10%)
+    -> increase interval
+
+    b) interval is too small (CPU usage > 10%) AND interval != config_interval
+    >
+    -> decrease interval
+
+    c) interval is config_interval (start or interval is perfect)
+
+  */
+
+  if (pcpu > PCPU_HI && this->last_pcpu > PCPU_HI)
+    new_interval = this->interval * 11 / 10;
+  else if (this->interval != config_interval && pcpu < PCPU_LO && this->last_pcpu < PCPU_LO)
+    new_interval = this->interval * 9 / 10;
+  else
+    new_interval = this->interval;
+
+  new_interval = CLAMP(new_interval, config_interval, config_interval * 2);
+  new_interval = CLAMP(new_interval, MIN_UPDATE_INTERVAL, MAX_UPDATE_INTERVAL);
+
+  bool changed = this->interval != new_interval;
+
+  if (changed)
+    this->interval = new_interval;
+
+  this->last_pcpu = pcpu;
+
+
+  if (changed) {
+    procman_debug("CPU usage is %3u%%, changed refresh_interval to %u (config %u)",
+		  this->last_pcpu,
+		  this->interval,
+		  config_interval);
+  }
+
+  g_assert(this->interval == new_interval);
+  g_assert(this->interval >= config_interval);
+
+  return changed;
+}
+
-- 
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