Peter Zijlstra 925d519ab8 perf_counter: unify and fix delayed counter wakeup ... While going over the wakeup code I noticed delayed wakeups only work for hardware counters but basically all software counters rely on them. This patch unifies and generalizes the delayed wakeup to fix this issue. Since we're dealing with NMI context bits here, use a cmpxchg() based single link list implementation to track counters that have pending wakeups. [ This should really be generic code for delayed wakeups, but since we cannot use cmpxchg()/xchg() in generic code, I've let it live in the perf_counter code. -- Eric Dumazet could use it to aggregate the network wakeups. ] Furthermore, the x86 method of using TIF flags was flawed in that its quite possible to end up setting the bit on the idle task, loosing the wakeup. The powerpc method uses per-cpu storage and does appear to be sufficient. Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Acked-by: Paul Mackerras <paulus@samba.org> Orig-LKML-Reference: <20090330171023.153932974@chello.nl> Signed-off-by: Ingo Molnar <mingo@elte.hu>		2009-04-06 09:30:36 +02:00
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acpi	ACPI: support acpi_device_ops .notify methods	2009-04-05 02:25:07 -04:00
asm-arm
asm-frv
asm-generic	Merge branch 'tracing-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip	2009-04-05 11:04:19 -07:00
asm-h8300
asm-m32r	Merge branch 'tracing-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip	2009-04-05 11:04:19 -07:00
asm-mn10300
crypto
drm
keys
linux	perf_counter: unify and fix delayed counter wakeup	2009-04-06 09:30:36 +02:00
math-emu
media
mtd
net
pcmcia
rdma
rxrpc
scsi
sound
trace
video
xen
Kbuild