[patch] sched: introduce SD_BALANCE_FORK for ht/mc/smp domains

["Siddha, Suresh B" <suresh.b.siddha@intel.com>]

Introduce SD_BALANCE_FORK for HT/MC/SMP domains.

For HT/MC, as caches are shared, SD_BALANCE_FORK is the right thing to do.
Given that NUMA domain already has this flag and the
scheduler currently doesn't have the concept of running threads belonging
to a process as close as possible(i.e., forking may keep close, but periodic
balance later will likely take them far away), introduce SD_BALANCE_FORK
for SMP domain too.

Signed-off-by: Suresh Siddha <suresh.b.siddha@intel.com>
---

diff --git a/include/linux/topology.h b/include/linux/topology.h
index d0890a7..dc15a9f 100644
--- a/include/linux/topology.h
+++ b/include/linux/topology.h
@@ -104,6 +104,7 @@
 	.flags			= SD_LOAD_BALANCE	\
 				| SD_BALANCE_NEWIDLE	\
 				| SD_BALANCE_EXEC	\
+				| SD_BALANCE_FORK	\
 				| SD_WAKE_AFFINE	\
 				| SD_WAKE_IDLE		\
 				| SD_SHARE_CPUPOWER,	\
@@ -135,6 +136,7 @@
 	.flags			= SD_LOAD_BALANCE	\
 				| SD_BALANCE_NEWIDLE	\
 				| SD_BALANCE_EXEC	\
+				| SD_BALANCE_FORK	\
 				| SD_WAKE_AFFINE	\
 				| SD_WAKE_IDLE		\
 				| SD_SHARE_PKG_RESOURCES\
@@ -166,6 +168,7 @@
 	.flags			= SD_LOAD_BALANCE	\
 				| SD_BALANCE_NEWIDLE	\
 				| SD_BALANCE_EXEC	\
+				| SD_BALANCE_FORK	\
 				| SD_WAKE_AFFINE	\
 				| SD_WAKE_IDLE		\
 				| BALANCE_FOR_PKG_POWER,\