Martin Schwidefsky 7bfa0a73b2 nohz: Introduce arch_needs_cpu ...

commit 3c5d92a0cf upstream.

Allow the architecture to request a normal jiffy tick when the system
goes idle and tick_nohz_stop_sched_tick is called . On s390 the hook is
used to prevent the system going fully idle if there has been an
interrupt other than a clock comparator interrupt since the last wakeup.

On s390 the HiperSockets response time for 1 connection ping-pong goes
down from 42 to 34 microseconds. The CPU cost decreases by 27%.

Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
LKML-Reference: <20090929122533.402715150@de.ibm.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: John Jolly <jjolly@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

2010-08-13 13:20:13 -07:00

..

airq.c

[S390] cio: airq - fix array boundary

2009-03-26 15:24:14 +01:00

blacklist.c

[S390] Fix memory leak in /proc/cio_ignore

2009-10-06 10:35:07 +02:00

blacklist.h

[PATCH] s390: multiple subchannel sets support

2006-01-06 08:33:52 -08:00

ccwgroup.c

[S390] pm: ccwgroup bus power management callbacks

2009-06-16 10:31:08 +02:00

chp.c

[S390] cio: channel path memory leak

2009-10-06 10:35:06 +02:00

chp.h

[S390] cio: Repair chpid event handling.

2008-07-14 10:02:11 +02:00

chsc_sch.c

[S390] pm: chsc subchannel driver power management callbacks

2009-06-16 10:31:10 +02:00

chsc_sch.h

[S390] cio: Add chsc subchannel driver.

2008-07-14 10:02:12 +02:00

chsc.c

[S390] pm: css bus power management callbacks

2009-06-16 10:31:09 +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

nohz: Introduce arch_needs_cpu

2010-08-13 13:20:13 -07:00

cio.h

[S390] cio: remove ccw_device init_name

2009-09-11 10:29:41 +02:00

cmf.c

[S390] pm: ccw bus power management callbacks

2009-06-16 10:31:08 +02:00

crw.c

[S390] cio/crw: add/fix locking

2009-03-26 15:24:13 +01:00

css.c

[S390] cio: introduce consistent subchannel scanning

2009-09-22 22:58:42 +02:00

css.h

[S390] cio: idset use actual number of ssids

2009-09-22 22:58:42 +02:00

device_fsm.c

cio: dont panic in non-fatal conditions

2010-01-28 15:02:22 -08:00

device_id.c

[S390] cio: provide functions for fcx enabled I/O

2008-07-14 10:02:08 +02:00

device_ops.c

[S390] pm: ccw bus power management callbacks

2009-06-16 10:31:08 +02:00

device_pgid.c

[S390] cio: introduce cio_update_schib

2008-12-25 13:39:10 +01:00

device_status.c

[S390] cio: introduce cio_update_schib

2008-12-25 13:39:10 +01:00

device.c

cio: fix double free in case of probe failure

2010-01-28 15:02:20 -08:00

device.h

[S390] cio: make not operational handling consistent

2009-10-06 10:35:07 +02:00

fcx.c

[S390] cio: provide functions for fcx enabled I/O

2008-07-14 10:02:08 +02:00

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] pm: ccw bus power management callbacks

2009-06-16 10:31:08 +02:00

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] cio: move scsw helper functions to header file

2009-09-11 10:29:36 +02:00

qdio_debug.c

const: constify remaining file_operations

2009-10-01 16:11:11 -07:00

qdio_debug.h

[S390] qdio: rework debug feature logging

2008-12-25 13:38:59 +01:00

qdio_main.c

[S390] qdio: change state of all primed input buffers

2009-09-22 22:58:43 +02:00

qdio_perf.c

const: constify remaining file_operations

2009-10-01 16:11:11 -07:00

qdio_perf.h

[S390] qdio: inline qdio_perf_stat_inc

2009-06-12 10:27:32 +02:00

qdio_setup.c

[S390] qdio: report SIGA errors directly

2009-03-26 15:24:22 +01:00

qdio_thinint.c

[S390] qdio: merge AI tasklet into interrupt handler

2009-06-22 12:08:20 +02:00

qdio.h

[S390] qdio: remove limited number of debugfs entries

2009-09-11 10:29:39 +02:00