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authorPeter Zijlstra <a.p.zijlstra@chello.nl>2010-10-14 02:01:34 -0400
committerIngo Molnar <mingo@elte.hu>2010-10-18 13:58:50 -0400
commite360adbe29241a0194e10e20595360dd7b98a2b3 (patch)
treeef5fa5f50a895096bfb25bc11b25949603158238 /init
parent8e5fc1a7320baf6076391607515dceb61319b36a (diff)
irq_work: Add generic hardirq context callbacks
Provide a mechanism that allows running code in IRQ context. It is most useful for NMI code that needs to interact with the rest of the system -- like wakeup a task to drain buffers. Perf currently has such a mechanism, so extract that and provide it as a generic feature, independent of perf so that others may also benefit. The IRQ context callback is generated through self-IPIs where possible, or on architectures like powerpc the decrementer (the built-in timer facility) is set to generate an interrupt immediately. Architectures that don't have anything like this get to do with a callback from the timer tick. These architectures can call irq_work_run() at the tail of any IRQ handlers that might enqueue such work (like the perf IRQ handler) to avoid undue latencies in processing the work. Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Acked-by: Kyle McMartin <kyle@mcmartin.ca> Acked-by: Martin Schwidefsky <schwidefsky@de.ibm.com> [ various fixes ] Signed-off-by: Huang Ying <ying.huang@intel.com> LKML-Reference: <1287036094.7768.291.camel@yhuang-dev> Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'init')
-rw-r--r--init/Kconfig8
1 files changed, 8 insertions, 0 deletions
diff --git a/init/Kconfig b/init/Kconfig
index 2de5b1cbadd9..1ef0b439908e 100644
--- a/init/Kconfig
+++ b/init/Kconfig
@@ -21,6 +21,13 @@ config CONSTRUCTORS
21 depends on !UML 21 depends on !UML
22 default y 22 default y
23 23
24config HAVE_IRQ_WORK
25 bool
26
27config IRQ_WORK
28 bool
29 depends on HAVE_IRQ_WORK
30
24menu "General setup" 31menu "General setup"
25 32
26config EXPERIMENTAL 33config EXPERIMENTAL
@@ -987,6 +994,7 @@ config PERF_EVENTS
987 default y if (PROFILING || PERF_COUNTERS) 994 default y if (PROFILING || PERF_COUNTERS)
988 depends on HAVE_PERF_EVENTS 995 depends on HAVE_PERF_EVENTS
989 select ANON_INODES 996 select ANON_INODES
997 select IRQ_WORK
990 help 998 help
991 Enable kernel support for various performance events provided 999 Enable kernel support for various performance events provided
992 by software and hardware. 1000 by software and hardware.