Merge branch 'sched-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel...

[karo-tx-linux.git] / init / Kconfig

diff --git a/init/Kconfig b/init/Kconfig
index 1862c6893078868c3ddbf5e124e7c3dd8e1ed2dc..3466a6e017b740b89d1ecb5e045b7b28f536c9c1 100644 (file)
--- a/init/Kconfig
+++ b/init/Kconfig
@@ -486,6 +486,24 @@ config PREEMPT_RCU
          This option enables preemptible-RCU code that is common between
          the TREE_PREEMPT_RCU and TINY_PREEMPT_RCU implementations.
 
+config RCU_USER_QS
+       bool "Consider userspace as in RCU extended quiescent state"
+       depends on HAVE_RCU_USER_QS && SMP
+       help
+         This option sets hooks on kernel / userspace boundaries and
+         puts RCU in extended quiescent state when the CPU runs in
+         userspace. It means that when a CPU runs in userspace, it is
+         excluded from the global RCU state machine and thus doesn't
+         to keep the timer tick on for RCU.
+
+config RCU_USER_QS_FORCE
+       bool "Force userspace extended QS by default"
+       depends on RCU_USER_QS
+       help
+         Set the hooks in user/kernel boundaries by default in order to
+         test this feature that treats userspace as an extended quiescent
+         state until we have a real user like a full adaptive nohz option.
+
 config RCU_FANOUT
        int "Tree-based hierarchical RCU fanout value"
        range 2 64 if 64BIT