From 76fa1e838bdf4b7c3a2a7afc4c7b99c82b68861f Mon Sep 17 00:00:00 2001 From: Ingo Molnar 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 Signed-off-by: Thomas Gleixner Signed-off-by: Paul Gortmaker --- 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///threaded + runtime flags. + + Say N if you are unsure. -- 1.7.0.4