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| author | Thomas Gleixner <tglx@linutronix.de> | 2011-02-23 23:52:23 +0000 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2011-02-26 11:57:18 +0100 |
| commit | 8d32a307e4faa8b123dc8a9cd56d1a7525f69ad3 (patch) | |
| tree | 50141928db9f0ac1377dd8bb355d600232d6b38c /include/linux/interrupt.h | |
| parent | 8eb90c30e0e815a1308828352eabd03ca04229dd (diff) | |
| download | lwn-8d32a307e4faa8b123dc8a9cd56d1a7525f69ad3.tar.gz lwn-8d32a307e4faa8b123dc8a9cd56d1a7525f69ad3.zip | |
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 'include/linux/interrupt.h')
| -rw-r--r-- | include/linux/interrupt.h | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/include/linux/interrupt.h b/include/linux/interrupt.h index 0fc3eb9397b4..f8a8af108e0c 100644 --- a/include/linux/interrupt.h +++ b/include/linux/interrupt.h @@ -383,6 +383,13 @@ static inline int disable_irq_wake(unsigned int irq) } #endif /* CONFIG_GENERIC_HARDIRQS */ + +#ifdef CONFIG_IRQ_FORCED_THREADING +extern bool force_irqthreads; +#else +#define force_irqthreads (0) +#endif + #ifndef __ARCH_SET_SOFTIRQ_PENDING #define set_softirq_pending(x) (local_softirq_pending() = (x)) #define or_softirq_pending(x) (local_softirq_pending() |= (x)) |