[IA64] Add config SCHED_SMT

Now that we have MC/MT detection patches in, appended patch allows us to
configure MT scheduler optimizations. For now, we will this option off
by default.

There is some discussion going on lkml about setting up sched-domains
which are absolutely needed (like for example, we shouldn't setup SMT domain
for non MT processors). Once that patch goes in, we can enable this option by
default.

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

diff --git a/arch/ia64/Kconfig b/arch/ia64/Kconfig
index 468dbe8a6b9c22779d583913db85eb6bef1bdd64..cad8346def1dc01a59e8a733b6bf9fd0df9cb609 100644 (file)
--- a/arch/ia64/Kconfig
+++ b/arch/ia64/Kconfig
@@ -261,6 +261,15 @@ config HOTPLUG_CPU
          can be controlled through /sys/devices/system/cpu/cpu#.
          Say N if you want to disable CPU hotplug.
 
+config SCHED_SMT
+       bool "SMT scheduler support"
+       depends on SMP
+       default off
+       help
+         Improves the CPU scheduler's decision making when dealing with
+         Intel IA64 chips with MultiThreading at a cost of slightly increased
+         overhead in some places. If unsure say N here.
+
 config PREEMPT
        bool "Preemptible Kernel"
         help