[PATCH] [CPUISOL] Add config options for CPU isolation

[maxk]

From: Max Krasnyansky <maxk@xxxxxxxxxxxx>

This simply adds a couple of new kconfig options for
configuring CPU isolation features.

Signed-off-by: Max Krasnyansky <maxk@xxxxxxxxxxxx>
---
 arch/x86/Kconfig       |    1 +
 kernel/Kconfig.cpuisol |   24 ++++++++++++++++++++++++
 2 files changed, 25 insertions(+), 0 deletions(-)
 create mode 100644 kernel/Kconfig.cpuisol

diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index 80b7ba4..b8f986e 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -495,6 +495,7 @@ config SCHED_MC
 	  increased overhead in some places. If unsure say N here.
 
 source "kernel/Kconfig.preempt"
+source "kernel/Kconfig.cpuisol"
 
 config X86_UP_APIC
 	bool "Local APIC support on uniprocessors"
diff --git a/kernel/Kconfig.cpuisol b/kernel/Kconfig.cpuisol
new file mode 100644
index 0000000..6e099a4
--- /dev/null
+++ b/kernel/Kconfig.cpuisol
@@ -0,0 +1,24 @@
+config CPUISOL
+	depends on SMP
+	bool "CPU isolation"
+	help
+	  This option enables support for CPU isolation.
+	  If enabled the kernel will try to avoid kernel activity on the isolated CPUs.
+	  By default user-space threads are not scheduled on the isolated CPUs unless 
+	  they explicitly request it (via sched_ and pthread_ affinity calls). Isolated
+	  CPUs are not subject to the scheduler load-balancing algorithms.
+	  
+	  CPUs can be marked as isolated using 'cpuisol=' command line option or by 
+	  writing '1' into /sys/devices/system/cpu/cpuN/isolated.
+	  
+	  This feature is useful for hard realtime and high performance applications.
+	  If unsure say 'N'.
+
+config CPUISOL_WORKQUEUE
+	bool "Do not schedule workqueues on isolated CPUs (EXPERIMENTAL)"
+	depends on CPUISOL && EXPERIMENTAL
+	help
+	  In this option is enabled kernel will not schedule workqueues on the 
+	  isolated CPUs.
+	  Please note that at this point this feature is experimental. It brakes 
+	  certain things like OProfile that heavily rely on per cpu workqueues.
-- 
1.5.3.7

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