experiments/power: Hold wakelock during cpu freq

Hold a wakelock to prevent suspending at any point.

Test: run ./run_cpu_frequency.py

Change-Id: I8e3040177ffb675771ec7ef53ade1d0061cad370

1 files changed, 6 insertions, 0 deletions

diff --git a/experiments/power/eas/run_cpu_frequency.py b/experiments/power/eas/run_cpu_frequency.py
index 15bddaa..4896883 100755
--- a/experiments/power/eas/run_cpu_frequency.py
+++ b/experiments/power/eas/run_cpu_frequency.py
@@ -98,6 +98,9 @@ def experiment():
     target.execute("stop thermal-engine")
     target.execute("stop perfd")
 
+    # Take a wakelock
+    System.wakelock(target, take=True)
+
     # Store governors so they can be restored later
     governors = [ target.cpufreq.get_governor(cpu) for cpu in cpus]
 
@@ -167,6 +170,9 @@ def experiment():
     # Restore non critical tasks
     target.cgroups.freeze(thaw=True)
 
+    # Release wakelock
+    System.wakelock(target, take=False)
+
     # Stop thermal engine and perfd
     target.execute("start thermal-engine")
     target.execute("start perfd")