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authorThomas Gleixner <tglx@linutronix.de>2011-02-23 23:52:23 +0000
committerThomas Gleixner <tglx@linutronix.de>2011-02-26 11:57:18 +0100
commit8d32a307e4faa8b123dc8a9cd56d1a7525f69ad3 (patch)
tree50141928db9f0ac1377dd8bb355d600232d6b38c /kernel/irq/Kconfig
parent8eb90c30e0e815a1308828352eabd03ca04229dd (diff)
downloadlinux-stericsson-8d32a307e4faa8b123dc8a9cd56d1a7525f69ad3.tar.gz
genirq: Provide forced interrupt threading
Add a commandline parameter "threadirqs" which forces all interrupts except those marked IRQF_NO_THREAD to run threaded. That's mostly a debug option to allow retrieving better debug data from crashing interrupt handlers. If "threadirqs" is not enabled on the kernel command line, then there is no impact in the interrupt hotpath. Architecture code needs to select CONFIG_IRQ_FORCED_THREADING after marking the interrupts which cant be threaded IRQF_NO_THREAD. All interrupts which have IRQF_TIMER set are implict marked IRQF_NO_THREAD. Also all PER_CPU interrupts are excluded. Forced threading hard interrupts also forces all soft interrupt handling into thread context. When enabled it might slow down things a bit, but for debugging problems in interrupt code it's a reasonable penalty as it does not immediately crash and burn the machine when an interrupt handler is buggy. Some test results on a Core2Duo machine: Cache cold run of: # time git grep irq_desc non-threaded threaded real 1m18.741s 1m19.061s user 0m1.874s 0m1.757s sys 0m5.843s 0m5.427s # iperf -c server non-threaded [ 3] 0.0-10.0 sec 1.09 GBytes 933 Mbits/sec [ 3] 0.0-10.0 sec 1.09 GBytes 934 Mbits/sec [ 3] 0.0-10.0 sec 1.09 GBytes 933 Mbits/sec threaded [ 3] 0.0-10.0 sec 1.09 GBytes 939 Mbits/sec [ 3] 0.0-10.0 sec 1.09 GBytes 934 Mbits/sec [ 3] 0.0-10.0 sec 1.09 GBytes 937 Mbits/sec Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Cc: Peter Zijlstra <peterz@infradead.org> LKML-Reference: <20110223234956.772668648@linutronix.de>
Diffstat (limited to 'kernel/irq/Kconfig')
-rw-r--r--kernel/irq/Kconfig3
1 files changed, 3 insertions, 0 deletions
diff --git a/kernel/irq/Kconfig b/kernel/irq/Kconfig
index 355b8c7957f5..144db9dcfcde 100644
--- a/kernel/irq/Kconfig
+++ b/kernel/irq/Kconfig
@@ -38,6 +38,9 @@ config HARDIRQS_SW_RESEND
config IRQ_PREFLOW_FASTEOI
bool
+config IRQ_FORCED_THREADING
+ bool
+
config SPARSE_IRQ
bool "Support sparse irq numbering"
depends on HAVE_SPARSE_IRQ