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linux/drivers/acpi
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Venki Pallipadi bde6f5f59c x86: voluntary leave_mm before entering ACPI C3 
Aviod TLB flush IPIs during C3 states by voluntary leave_mm()
before entering C3.

The performance impact of TLB flush on C3 should not be significant with
respect to C3 wakeup latency. Also, CPUs tend to flush TLB in hardware while in
C3 anyways.

On a 8 logical CPU system, running make -j2, the number of tlbflush IPIs goes
down from 40 per second to ~ 0. Total number of interrupts during the run
of this workload was ~1200 per second, which makes it ~3% savings in wakeups.

There was no measurable performance or power impact however.

[ akpm@linux-foundation.org: symbol export fixes. ]

Signed-off-by: Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
 		2008-01-30 13:32:01 +01:00
..
dispatcher ACPICA: fix acpi-cpufreq boot crash due to _PSD return-by-reference 2007-12-02 14:26:55 -05:00
events ACPICA: fix acpi_serialize hang regression 2008-01-10 23:04:10 -05:00
executer ACPICA: Lindent 2007-05-09 23:34:35 -04:00
hardware Pull acpica into test branch 2007-10-10 01:00:45 -04:00
namespace ACPI: Fix a warning of discarding qualifiers from pointer target type 2007-08-25 01:38:40 -04:00
parser ACPICA: Lindent 2007-05-09 23:34:35 -04:00
resources fix compilation with gcc 4.2 2007-08-11 15:47:42 -07:00
sleep Pull alexey-fixes into release branch 2007-10-29 17:30:21 -04:00
tables ACPI: Add missing spaces to printk format 2007-11-19 21:53:32 -05:00
utilities ACPI: add dump_stack() to trace acpi_format_exception programming errors 2007-08-25 01:39:02 -04:00
Kconfig ACPI: Make sysfs interface in ACPI power optional. 2008-01-01 14:27:24 -05:00
Makefile ACPI: Split out control for /proc/acpi entries from battery, ac, and sbs. 2007-11-19 11:21:50 -05:00
ac.c ACPI: Make sysfs interface in ACPI power optional. 2008-01-01 14:27:24 -05:00
acpi_memhotplug.c ACPI: autoload modules - Create __mod_acpi_device_table symbol for all ACPI drivers 2007-07-23 13:56:42 -04:00
asus_acpi.c ACPI: Schedule /proc/acpi/event for removal 2007-08-23 15:20:26 -04:00
battery.c ACPI: Make sysfs interface in ACPI power optional. 2008-01-01 14:27:24 -05:00
bay.c ACPI: bay: send envp with uevent - fix 2007-08-11 22:10:04 -04:00
blacklist.c ACPI: DMI blacklist to reduce console warnings on OSI(Linux) systems. 2008-01-23 21:28:12 -05:00
bus.c firmware: change firmware_kset to firmware_kobj 2008-01-24 20:40:23 -08:00
button.c ACPI: button: send initial lid state after add and resume 2007-10-25 16:31:30 -04:00
cm_sbs.c ACPI: clean up ACPI_MODULE_NAME() use 2007-02-12 22:42:12 -05:00
container.c ACPI: autoload modules - Create __mod_acpi_device_table symbol for all ACPI drivers 2007-07-23 13:56:42 -04:00
debug.c ACPI: clean up ACPI_MODULE_NAME() use 2007-02-12 22:42:12 -05:00
dock.c ACPI: dock: Send key=value pair instead of plain value 2007-08-11 22:12:10 -04:00
ec.c ACPI: EC: "DEBUG" needs to be defined earlier 2008-01-23 22:34:09 -05:00
event.c ACPI: fix CONFIG_NET=n acpi_bus_generate_netlink_event build failure 2007-09-03 11:15:11 -04:00
fan.c Revert "ACPI: Fan: Drop force_power_state acpi_device option" 2008-01-23 22:41:20 -05:00
glue.c ACPI: fix empty macros found by -Wextra 2007-07-22 00:54:24 -04:00
numa.c ACPI: fix modpost warnings 2007-12-13 17:50:09 -05:00
osl.c ACPI: make _OSI(Linux) console messages smarter 2008-01-23 21:26:15 -05:00
pci_bind.c ACPI: acpiphp: Remove dmesg spam on device remove 2007-11-20 19:06:04 -05:00
pci_irq.c ACPI : Not register gsi for PCI IDE controller in legacy mode 2008-01-10 22:49:58 -05:00
pci_link.c Driver core: change sysdev classes to use dynamic kobject names 2008-01-24 20:40:40 -08:00
pci_root.c ACPI: autoload modules - Create __mod_acpi_device_table symbol for all ACPI drivers 2007-07-23 13:56:42 -04:00
power.c ACPI: power: don't cache power resource state 2007-10-25 16:31:31 -04:00
processor_core.c ACPI: avoid references to impossible processors. 2007-11-29 09:24:55 -08:00
processor_idle.c x86: voluntary leave_mm before entering ACPI C3 2008-01-30 13:32:01 +01:00
processor_perflib.c acpi-cpufreq: Fix some x86/x86-64 acpi-cpufreq driver issues 2007-08-07 18:40:30 -04:00
processor_thermal.c ACPI: delete extra #defines in /drivers/acpi/ drivers 2007-02-12 23:50:52 -05:00
processor_throttling.c ACPI: processor: Fix null pointer dereference in throttling 2008-01-15 00:47:47 -05:00
sbs.c ACPI: Make sysfs interface in ACPI power optional. 2008-01-01 14:27:24 -05:00
sbshc.c ACPI: SBS: Ignore alarms coming from unknown devices 2007-12-14 15:14:06 -05:00
sbshc.h ACPI: SBS: Ignore alarms coming from unknown devices 2007-12-14 15:14:06 -05:00
scan.c ACPI: EC: Enable boot EC before bus_scan 2008-01-01 14:12:55 -05:00
system.c Kobject: change drivers/acpi/system.c to use kobject_create_and_add 2008-01-24 20:40:28 -08:00
tables.c Revert "ACPI: parse 2nd MADT by default" 2007-03-30 14:16:10 -04:00
thermal.c Merge branch 'release' of git://git.kernel.org/pub/scm/linux/kernel/git/lenb/linux-acpi-2.6 2007-10-19 13:12:46 -07:00
toshiba_acpi.c Fix Oops in toshiba_acpi error return path 2007-11-14 18:45:36 -08:00
utils.c ACPI: clean up ACPI_MODULE_NAME() use 2007-02-12 22:42:12 -05:00
video.c ACPI: video_device_list corruption 2007-12-13 16:24:10 -05:00