linux/arch/s390
Martin Schwidefsky 6377981faf [S390] idle time accounting vs. machine checks
A machine check can interrupt the i/o and external interrupt handler
anytime. If the machine check occurs while the interrupt handler is
waking up from idle vtime_start_cpu can get executed a second time
and the int_clock / async_enter_timer values in the lowcore get
clobbered. This can confuse the cpu time accounting.
To fix this problem two changes are needed. First the machine check
handler has to use its own copies of int_clock and async_enter_timer,
named mcck_clock and mcck_enter_timer. Second the nested execution
of vtime_start_cpu has to be prevented. This is done in s390_idle_check
by checking the wait bit in the program status word.

Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2010-05-17 10:00:15 +02:00
..
appldata include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h 2010-03-30 22:02:32 +09:00
boot [S390] fix boot failures with compressed kernels 2010-03-24 11:49:54 +01:00
crypto include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h 2010-03-30 22:02:32 +09:00
hypfs include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h 2010-03-30 22:02:32 +09:00
include/asm [S390] idle time accounting vs. machine checks 2010-05-17 10:00:15 +02:00
kernel [S390] idle time accounting vs. machine checks 2010-05-17 10:00:15 +02:00
kvm include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h 2010-03-30 22:02:32 +09:00
lib [S390] uaccess: make sure copy_from_user_overflow is builtin 2010-03-08 12:25:29 +01:00
math-emu tree-wide: fix assorted typos all over the place 2009-12-04 15:39:55 +01:00
mm [S390] s390: disable change bit override 2010-04-09 13:43:02 +02:00
oprofile Combine instrumentation menus in kernel/Kconfig.instrumentation 2007-10-19 11:53:54 -07:00
Kconfig Merge branch 'tracing-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip 2010-02-28 10:17:55 -08:00
Kconfig.debug [S390] uaccess: implement strict user copy checks 2010-02-26 22:37:29 +01:00
Makefile [S390] add support for compressed kernels 2010-02-26 22:37:33 +01:00
defconfig [S390] Update default configuration. 2010-04-09 13:43:02 +02:00