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6377981faf
linux/drivers/s390/cio
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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
..
airq.c [S390] cio: airq - fix array boundary 2009-03-26 15:24:14 +01:00
blacklist.c 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
blacklist.h
ccwgroup.c const: constify remaining dev_pm_ops 2009-12-15 08:53:25 -08:00
ccwreq.c [S390] Cleanup struct _lowcore usage and defines. 2010-02-26 22:37:31 +01:00
chp.c 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
chp.h [S390] cio: Repair chpid event handling. 2008-07-14 10:02:11 +02:00
chsc_sch.c [S390] cio: use exception-save stsch 2010-04-22 17:17:19 +02:00
chsc_sch.h [S390] cio: Add chsc subchannel driver. 2008-07-14 10:02:12 +02:00
chsc.c [S390] cio: allow enable_facility from outside init functions 2010-04-22 17:17:19 +02:00
chsc.h [S390] cio: move scsw helper functions to header file 2009-09-11 10:29:36 +02:00
cio_debug.h [S390] cio: Remove cio_msg kernel parameter. 2008-05-07 09:23:01 +02:00
cio.c [S390] idle time accounting vs. machine checks 2010-05-17 10:00:15 +02:00
cio.h [S390] cio: introduce subchannel todos 2009-12-07 12:51:30 +01:00
cmf.c tree-wide: fix assorted typos all over the place 2009-12-04 15:39:55 +01:00
crw.c [S390] cio: wait for channel report 2010-02-26 22:37:29 +01:00
css.c [S390] More cleanup for struct _lowcore 2010-05-17 10:00:15 +02:00
css.h [S390] cio: trigger subchannel event at resume time 2010-02-26 22:37:30 +01:00
device_fsm.c [S390] cio: use exception-save stsch 2010-04-22 17:17:19 +02:00
device_id.c [S390] cio: improve error recovery for internal I/Os 2009-12-07 12:51:33 +01:00
device_ops.c [S390] cio: make steal lock procedure more robust 2009-12-07 12:51:32 +01:00
device_pgid.c [S390] cio: fix channel path vary 2009-12-18 17:43:32 +01:00
device_status.c [S390] cio: remove intretry flag 2009-12-07 12:51:31 +01:00
device.c [S390] cio: fix init_count in case of recognition after steal lock 2010-03-08 12:25:30 +01:00
device.h [S390] ccw_device_notify: improve return codes 2010-02-26 22:37:29 +01:00
fcx.c [S390] drivers: Correct size given to memset 2009-12-18 17:43:32 +01:00
idset.c [S390] cio: introduce consistent subchannel scanning 2009-09-22 22:58:42 +02:00
idset.h [S390] cio: introduce consistent subchannel scanning 2009-09-22 22:58:42 +02:00
io_sch.h [S390] cio: fix channel path vary 2009-12-18 17:43:32 +01:00
ioasm.h [S390] cio: inline assembly cleanup 2008-10-10 21:33:53 +02:00
isc.c [S390] cio: introduce isc_(un)register functions. 2008-07-14 10:02:11 +02:00
itcw.c [S390] cio: provide helper functions for fcx enabled I/O 2008-07-14 10:02:08 +02:00
Makefile [S390] qdio: convert global statistics to per-device stats 2010-01-04 09:05:58 +01:00
qdio_debug.c [S390] remove unused qdio flags in zfcp and qeth 2010-03-08 12:25:30 +01:00
qdio_debug.h [S390] qdio: rework debug feature logging 2008-12-25 13:38:59 +01:00
qdio_main.c 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
qdio_setup.c [S390] qdio: optimize cache line usage of struct qdio_irq 2010-02-26 22:37:31 +01:00
qdio_thinint.c 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
qdio.h [S390] qdio: optimize cache line usage of struct qdio_irq 2010-02-26 22:37:31 +01:00