kernel-fxtec-pro1x/arch/x86
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
..
boot Merge branch 'dma-debug' of git://git.kernel.org/pub/scm/linux/kernel/git/joro/linux-2.6-iommu into x86/urgent 2009-04-03 16:35:09 +02:00
configs Merge branches 'x86/apic', 'x86/defconfig', 'x86/memtest', 'x86/mm' and 'linus' into x86/core 2009-02-26 06:31:32 +01:00
crypto crypto: aes-ni - Add support to Intel AES-NI instructions for x86_64 platform 2009-02-18 16:48:06 +08:00
ia32 Merge branch 'linus' into perfcounters/core-v2 2009-04-06 09:02:57 +02:00
include/asm perf_counter: unify and fix delayed counter wakeup 2009-04-06 09:30:36 +02:00
kernel perf_counter: unify and fix delayed counter wakeup 2009-04-06 09:30:36 +02:00
kvm Merge branch 'tracing/core-v2' into tracing-for-linus 2009-04-02 00:49:02 +02:00
lguest Merge git://git.kernel.org/pub/scm/linux/kernel/git/rusty/linux-2.6-lguest-and-virtio 2009-03-30 17:57:39 -07:00
lib x86: memcpy, clean up 2009-03-12 12:21:17 +01:00
math-emu Merge branch 'core/percpu' into percpu-cpumask-x86-for-linus-2 2009-03-27 17:28:43 +01:00
mm perf_counter: provide major/minor page fault software events 2009-04-06 09:29:40 +02:00
oprofile Merge branch 'linus' into perfcounters/core-v2 2009-04-06 09:02:57 +02:00
pci x86, PAT: Remove duplicate memtype reserve in pci mmap 2009-04-03 14:43:29 -07:00
power x86: disable stack-protector for __restore_processor_state() 2009-04-03 19:48:41 +02:00
vdso x86, mm: rename TASK_SIZE64 => TASK_SIZE_MAX 2009-02-21 00:09:44 +01:00
video
xen Merge branch 'linus' into cpumask-for-linus 2009-03-30 23:53:32 +02:00
Kconfig Merge branch 'linus' into perfcounters/core-v2 2009-04-06 09:02:57 +02:00
Kconfig.cpu x86/centaur: merge 32 & 64 bit version 2009-03-14 16:27:29 +01:00
Kconfig.debug generic debug pagealloc: build fix 2009-04-02 19:04:48 -07:00
Makefile x86: use targets in the boot Makefile instead of CLEAN_FILES 2009-03-12 13:43:14 -07:00
Makefile_32.cpu