CHROMIUM: config: enable RCU_FAST_NO_HZ

Enable RCU_FAST_NO_HZ kernel config option. This allows the CPU to get to
idle state quicker and saves about 100-200mW of power on x86 systems
under medium load conditions.

BUG=none
TEST=build kernel and ensure that CONFIG_RCU_FAST_NO_HZ is to y in the
kernel config file.

Change-Id: I85a0ca5f8cebb55c83582cbc43fffd49984185a3
Signed-off-by: Sameer Nanda <snanda@chromium.org>
Reviewed-on: https://gerrit.chromium.org/gerrit/30271
Reviewed-by: Olof Johansson <olofj@chromium.org>

diff --git a/chromeos/config/base.config b/chromeos/config/base.config
index a7ff44e..7ea913c 100644 (file)
--- a/chromeos/config/base.config
+++ b/chromeos/config/base.config
@@ -1194,7 +1194,7 @@ CONFIG_RAMOOPS=y
 CONFIG_RCU_CPU_STALL_TIMEOUT=60
 CONFIG_RCU_FANOUT=32
 # CONFIG_RCU_FANOUT_EXACT is not set
-# CONFIG_RCU_FAST_NO_HZ is not set
+CONFIG_RCU_FAST_NO_HZ=y
 # CONFIG_RCU_TORTURE_TEST is not set
 # CONFIG_RCU_TRACE is not set
 # CONFIG_RDS is not set