From 3eb500b11a3faf768cf96fd6034141eff6ffa83c Mon Sep 17 00:00:00 2001
From: Jason Gross <jgross@mit.edu>
Date: Fri, 15 Sep 2017 16:27:58 -0400
Subject: Update etc scripts to include governor

It needs to be in performance, not powersave, to work well on my
machine.

While we're at it, also have the scripts print usage if you pass no
arguments, rather than giving an error message about $1 being unset.
---
 etc/governor.sh | 25 +++++++++++++++++++++++++
 1 file changed, 25 insertions(+)
 create mode 100755 etc/governor.sh

(limited to 'etc/governor.sh')

diff --git a/etc/governor.sh b/etc/governor.sh
new file mode 100755
index 000000000..caabb9da8
--- /dev/null
+++ b/etc/governor.sh
@@ -0,0 +1,25 @@
+#!/bin/sh
+set -eu
+
+usage() {
+  generators="$1"
+  echo "USAGE: $0 <$(echo "$generators" | tr ' ' '|')>"
+  exit 111
+}
+
+
+for cpu in "/sys/devices/system/cpu/cpu"[0-9]* ; do
+  if grep -vq '^1$' "$cpu/online" 2>/dev/null; then
+    continue
+  fi
+  generators="$(cat "$cpu/cpufreq/scaling_available_governors")"
+  if [ "$#" -eq 0 ] || [ -z "$1" ]; then
+    usage "$generators"
+  elif (echo -n "$generators" | tr ' ' '\n' | grep -q "^$1\$" 2>/dev/null); then
+    if grep -vq "^$1\$" "$cpu/cpufreq/scaling_governor" 2>/dev/null; then
+      echo "$1" > "$cpu/cpufreq/scaling_governor"
+    fi
+  else
+    usage "$generators"
+  fi
+done
-- 
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