linux-sg2042/include
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
..
acpi x86: dummy placeholder for acpi/reboot.h 2008-01-30 13:31:17 +01:00
asm-alpha alpha: build fixes 2007-12-17 19:28:16 -08:00
asm-arm ext4: Add ext4_find_next_bit() 2008-01-28 23:58:27 -05:00
asm-avr32 remove __attribute_used__ 2008-01-28 23:21:18 +01:00
asm-blackfin [Blackfin] arch: Add the semtimedop syscall. Upstream uClibc doesn't compile without it. 2008-01-27 19:56:43 +08:00
asm-cris ide: remove stale ide.h "configuration options" 2008-01-25 22:17:08 +01:00
asm-frv ide: remove stale ide.h "configuration options" 2008-01-25 22:17:08 +01:00
asm-generic Merge git://git.kernel.org/pub/scm/linux/kernel/git/sam/kbuild 2008-01-29 22:46:14 +11:00
asm-h8300 asm-h8300: parentheses around definition CLOCK_TICK_RATE 2007-12-10 19:43:54 -08:00
asm-ia64 x86: voluntary leave_mm before entering ACPI C3 2008-01-30 13:32:01 +01:00
asm-m32r core: remove last users of empty FASTCALL macro 2008-01-30 13:31:17 +01:00
asm-m68k ext4: Add ext4_find_next_bit() 2008-01-28 23:58:27 -05:00
asm-m68knommu ext4: Add ext4_find_next_bit() 2008-01-28 23:58:27 -05:00
asm-mips [MIPS] Malta, Atlas: move an extern function declaration to the header file 2008-01-29 10:15:05 +00:00
asm-parisc [PARISC] print more than one character at a time for pdc console 2007-12-06 09:32:15 -08:00
asm-powerpc powerpc: arch_has_single_step 2008-01-30 13:30:51 +01:00
asm-ppc ppc: fix AT_VECTOR_SIZE on arch/ppc 2007-10-22 19:18:54 -07:00
asm-s390 ext4: Add ext4_find_next_bit() 2008-01-28 23:58:27 -05:00
asm-sh remove __attribute_used__ 2008-01-28 23:21:18 +01:00
asm-sparc [SPARC32]: Silence sparc32 warnings on missing syscalls. 2007-12-14 10:59:50 -08:00
asm-sparc64 [SPARC64]: Implement pci_resource_to_user() 2007-12-26 19:33:46 -08:00
asm-um uml: add asm-um/asm.h 2008-01-30 13:31:17 +01:00
asm-v850 Add CONFIG_DEBUG_SG sg validation 2007-10-22 21:20:03 +02:00
asm-x86 x86: voluntary leave_mm before entering ACPI C3 2008-01-30 13:32:01 +01:00
asm-xtensa xtensa: dma-mapping.h is using linux/scatterlist.h functions, so include it 2007-10-24 13:28:40 +02:00
crypto [CRYPTO] api: Include sched.h for cond_resched in scatterwalk.h 2008-01-11 08:16:59 +11:00
keys
linux x86: x86 core dump TLS 2008-01-30 13:31:56 +01:00
math-emu
media i2c: Constify client address data 2008-01-27 18:14:46 +01:00
mtd
net [NET_SCHED]: act_api: use PTR_ERR in tcf_action_init/tcf_action_get 2008-01-28 15:11:17 -08:00
pcmcia [AVR32] pcmcia ioaddr_t should be 32 bits on AVR32 2007-11-15 13:47:19 +01:00
rdma RDMA/cma: add support for rdma_migrate_id() 2008-01-25 14:15:32 -08:00
rxrpc
scsi SG: Convert SCSI to use scatterlist helpers for sg chaining 2008-01-28 10:05:27 +01:00
sound [ALSA] version 1.0.15 2007-11-20 20:16:43 +01:00
video Make asm-x86/bootparam.h includable from userspace. 2007-10-23 15:49:47 +10:00
xen
Kbuild