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From 76fa1e838bdf4b7c3a2a7afc4c7b99c82b68861f Mon Sep 17 00:00:00 2001
From: Ingo Molnar <mingo@elte.hu>
Date: Fri, 3 Jul 2009 08:29:35 -0500
Subject: [PATCH] genirq: Enable the config switch for forced threading
commit 7d836495d944ab225c939c7d3f3c0eca6a37f409 in tip.
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
---
kernel/Kconfig.preempt | 19 +++++++++++++++++++
1 files changed, 19 insertions(+), 0 deletions(-)
diff --git a/kernel/Kconfig.preempt b/kernel/Kconfig.preempt
index 2ff1834..7c20f45 100644
--- a/kernel/Kconfig.preempt
+++ b/kernel/Kconfig.preempt
@@ -67,3 +67,22 @@ config PREEMPT_SOFTIRQS
sofirq-preempt=0/1 boot-time option.
Say N if you are unsure.
+
+config PREEMPT_HARDIRQS
+ bool "Thread Hardirqs"
+ default n
+ depends on GENERIC_HARDIRQS_NO__DO_IRQ
+ select PREEMPT_SOFTIRQS
+ help
+ This option reduces the latency of the kernel by 'threading'
+ hardirqs. This means that all (or selected) hardirqs will run
+ in their own kernel thread context. While this helps latency,
+ this feature can also reduce performance.
+
+ The threading of hardirqs can also be controlled via the
+ /proc/sys/kernel/hardirq_preemption runtime flag and the
+ hardirq-preempt=0/1 boot-time option. Per-irq threading can
+ be enabled/disable via the /proc/irq/<IRQ>/<handler>/threaded
+ runtime flags.
+
+ Say N if you are unsure.
--
1.7.0.4
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