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irq_work: Add generic hardirq context callbacks

Browse source 
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 <[email protected]>
Acked-by: Kyle McMartin <[email protected]>
Acked-by: Martin Schwidefsky <[email protected]>
[ various fixes ]
Signed-off-by: Huang Ying <[email protected]>
LKML-Reference: <1287036094.7768.291.camel@yhuang-dev>
Signed-off-by: Ingo Molnar <[email protected]>
This commit is contained in:
Peter Zijlstra 2010-10-14 14:01:34 +08:00 • committed by Ingo Molnar
commit e360adbe29
39 changed files with 311 additions and 242 deletions
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1
arch/frv/Kconfig
View file

@ -7,6 +7,7 @@ config FRV
default y
select HAVE_IDE
select HAVE_ARCH_TRACEHOOK
select HAVE_IRQ_WORK
select HAVE_PERF_EVENTS
config ZONE_DMA

2
arch/frv/lib/Makefile
View file

@ -5,4 +5,4 @@
lib-y := \
__ashldi3.o __lshrdi3.o __muldi3.o __ashrdi3.o __negdi2.o __ucmpdi2.o \
checksum.o memcpy.o memset.o atomic-ops.o atomic64-ops.o \
outsl_ns.o outsl_sw.o insl_ns.o insl_sw.o cache.o perf_event.o
outsl_ns.o outsl_sw.o insl_ns.o insl_sw.o cache.o

19
arch/frv/lib/perf_event.c
View file

@ -1,19 +0,0 @@
/* Performance event handling
*
* Copyright (C) 2009 Red Hat, Inc. All Rights Reserved.
* Written by David Howells (dhowells@redhat.com)
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public Licence
* as published by the Free Software Foundation; either version
* 2 of the Licence, or (at your option) any later version.
*/
#include <linux/perf_event.h>
/*
* mark the performance event as pending
*/
void set_perf_event_pending(void)
{
}