sched, mm, x86: Add the ARCH_SUPPORTS_NUMA_BALANCING flag

Allow architectures to opt-in to the adaptive affinity NUMA balancing code.

Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: Rik van Riel <riel@redhat.com>
Cc: Mel Gorman <mgorman@suse.de>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Hugh Dickins <hughd@google.com>
Signed-off-by: Ingo Molnar <mingo@kernel.org>

diff --git a/init/Kconfig b/init/Kconfig
index b8a4a5822cf46186c80e8abf2637128420de851c..cf3e79c387c7ac9814e2852fcbd6c93a753e5fe3 100644 (file)
--- a/init/Kconfig
+++ b/init/Kconfig
@@ -725,6 +725,13 @@ config ARCH_USES_NUMA_GENERIC_PGPROT_HUGEPAGE
 config ARCH_WANTS_NUMA_VARIABLE_LOCALITY
        bool
 
+#
+# For architectures that want to enable the PROT_NONE driven,
+# NUMA-affine scheduler balancing logic:
+#
+config ARCH_SUPPORTS_NUMA_BALANCING
+       bool
+
 menuconfig CGROUPS
        boolean "Control Group support"
        depends on EVENTFD