linux-sg2042/drivers/cpuidle
Corrado Zoccolo 672917dcc7 cpuidle: menu governor: reduce latency on exit
Move the state residency accounting and statistics computation off the hot
exit path.

On exit, the need to recompute statistics is recorded, and new statistics
will be computed when menu_select is called again.

The expected effect is to reduce processor wakeup latency from sleep
(C-states).  We are speaking of few hundreds of cycles reduction out of a
several microseconds latency (determined by the hardware transition), so
it is difficult to measure.

Signed-off-by: Corrado Zoccolo <czoccolo@gmail.com>
Cc: Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>
Cc: Len Brown <len.brown@intel.com>
Cc: Adam Belay <abelay@novell.com
Acked-by: Arjan van de Ven <arjan@linux.intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2009-09-22 07:17:45 -07:00
..
governors cpuidle: menu governor: reduce latency on exit 2009-09-22 07:17:45 -07:00
Kconfig ACPI: CONFIG_CPU_IDLE=ACPI by default 2007-11-19 22:22:37 -05:00
Makefile cpuidle: consolidate 2.6.22 cpuidle branch into one patch 2007-10-10 00:12:41 -04:00
cpuidle.c tracing, x86, cpuidle: Move the end point of a C state in the power tracer 2009-09-19 18:57:52 +02:00
cpuidle.h cpuidle: consolidate 2.6.22 cpuidle branch into one patch 2007-10-10 00:12:41 -04:00
driver.c cpuidle: consolidate 2.6.22 cpuidle branch into one patch 2007-10-10 00:12:41 -04:00
governor.c cpuidle: remove unused exports 2007-10-29 17:27:50 -04:00
sysfs.c cpuidle: make sysfs attributes sysdev class attributes 2008-08-12 16:07:28 -07:00