1
linux/drivers
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
..
acorn/char
acpi x86: voluntary leave_mm before entering ACPI C3 2008-01-30 13:32:01 +01:00
amba
ata libata: Change "write_data" to "rw" for some function documentations 2008-01-29 08:48:17 +11:00
atm [ATM]: [he] fixing compilation when you define USE_RBPS_POOL/USE_RBPL_POOL 2008-01-28 15:00:15 -08:00
auxdisplay
base convert drivers/base/power/Makefile to ccflags 2008-01-28 23:14:35 +01:00
block cciss: fix bug in overriding ->data_len before completion 2008-01-29 21:55:18 +01:00
bluetooth
cdrom Merge git://git.kernel.org/pub/scm/linux/kernel/git/lethal/sh-2.6 2008-01-29 08:52:50 +11:00
char x86: clean up drivers/char/rtc.c 2008-01-30 13:31:09 +01:00
clocksource
connector [NETNS]: Consolidate kernel netlink socket destruction. 2008-01-28 15:08:07 -08:00
cpufreq
cpuidle
crypto
dca
dio
dma
edac
eisa
firewire
firmware x86: fix DMI out of memory problems 2008-01-30 13:31:59 +01:00
hid HID: ADS/Tech Radio si470x needs blacklist entry 2008-01-28 14:51:23 +01:00
hwmon
i2c Merge branch 'orion' into devel 2008-01-28 13:21:30 +00:00
ide blk_end_request: changing ide-cd (take 4) 2008-01-28 10:37:06 +01:00
ieee1394
infiniband Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-2.6.25 2008-01-29 22:54:01 +11:00
input x86: replace outb_p() with udelay(2) in drivers/input/mouse/pc110pad.c 2008-01-30 13:31:24 +01:00
isdn
kvm x86: get rid of _MASK flags 2008-01-30 13:31:27 +01:00
leds
lguest x86: use generic register name in the thread and tss structures 2008-01-30 13:31:02 +01:00
macintosh i2c: Kill rogue driver IDs 2008-01-27 18:14:47 +01:00
mca
md
media i2c: Drivers stop using the redundant client list 2008-01-27 18:14:51 +01:00
message blk_end_request: changing i2o_block (take 4) 2008-01-28 10:36:50 +01:00
mfd [ARM] Fix class_device damage caused by 0c55445f20 2008-01-28 10:59:09 +00:00
misc
mmc Merge branch 'blk-end-request' of git://git.kernel.dk/linux-2.6-block 2008-01-29 08:51:32 +11:00
mtd
net Mostly revert "e1000/e1000e: Move PCI-Express device IDs over to e1000e" 2008-01-30 09:54:54 +11:00
nubus
of
oprofile
parisc [PARISC]: Fix build after ipv4_is_*() changes. 2008-01-28 14:58:20 -08:00
parport
pci
pcmcia [ARM] pxa: move memory controller registers into pxa2xx-regs.h 2008-01-26 15:07:54 +00:00
pnp
power
ps3
rapidio remove __attribute_used__ 2008-01-28 23:21:18 +01:00
rtc Merge git://git.kernel.org/pub/scm/linux/kernel/git/lethal/sh-2.6 2008-01-29 08:52:50 +11:00
s390 [VLAN]: Turn VLAN_DEV_INFO into inline function 2008-01-28 15:08:32 -08:00
sbus
scsi [NETNS]: Consolidate kernel netlink socket destruction. 2008-01-28 15:08:07 -08:00
serial Merge git://git.kernel.org/pub/scm/linux/kernel/git/lethal/sh-2.6 2008-01-29 08:52:50 +11:00
sh
sn
spi [ARM] pxa: make pxa2xx_spi driver use ssp_request()/ssp_free() 2008-01-26 15:07:52 +00:00
ssb ssb: Add boardflags_hi field to the sprom data structure 2008-01-28 15:09:52 -08:00
tc
telephony
uio
usb Merge branch 'pxa-plat' into devel 2008-01-28 13:21:38 +00:00
video Merge branches 'at91', 'ep93xx', 'iop', 'kprobes', 'ks8695', 'misc', 'msm', 's3c2410', 'sa1100' and 'vfp' into devel 2008-01-28 13:21:21 +00:00
virtio
w1 i2c: normal_i2c can be made const (remaining drivers) 2008-01-27 18:14:47 +01:00
watchdog
xen
zorro
Kconfig
Makefile