Adhemerval Zanella fcb41a2030 powerpc: Add VDSO version of time ...

On 04/18/2013 07:38 PM, Anton Blanchard wrote:
> Since you are only reading one long you shouldn't need to check the
> update count and loop, you will always see a consistent value. The
> system call version of time() just does an unprotected load for example.

Fixed.

> With the above change and with Michael's comments covered (decent
> changelog entry and Signed-off-by):
>
> Acked-by: Anton Blanchard <anton@samba.org>

Thanks for the review, below the updated patch:

From: Adhemerval Zanella <azanella@linux.vnet.ibm.com>

This patch implement the time syscall as vDSO. The performance speedups
are:

Baseline PPC32: 380 nsec
Baseline PPC64: 350 nsec
vdso PPC32:      20 nsec
vsdo PPC64:      20 nsec

Tested on 64 bit build with both 32 bit and 64 bit userland.

Acked-by: Anton Blanchard <anton@samba.org>
Signed-off-by: Adhemerval Zanella <azanella@linux.vnet.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

2013-04-23 16:05:05 +10:00

..

vdso32

powerpc: Add VDSO version of time

2013-04-23 16:05:05 +10:00

vdso64

powerpc: Add VDSO version of time

2013-04-23 16:05:05 +10:00

.gitignore

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align.c

Disintegrate asm/system.h for PowerPC

2012-03-28 18:30:02 +01:00

asm-offsets.c

Merge tag 'kvm-3.9-1' of git://git.kernel.org/pub/scm/virt/kvm/kvm

2013-02-24 13:07:18 -08:00

audit.c

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btext.c

powerpc: various straight conversions from module.h --> export.h

2011-10-31 19:30:44 -04:00

cacheinfo.c

cpu: convert 'cpu' and 'machinecheck' sysdev_class to a regular subsystem

2011-12-21 14:29:42 -08:00

cacheinfo.h

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clock.c

powerpc: various straight conversions from module.h --> export.h

2011-10-31 19:30:44 -04:00

compat_audit.c

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cpu_setup_6xx.S

powerpc: Fix some 6xx/7xxx CPU setup functions

2011-02-07 12:57:11 +11:00

cpu_setup_44x.S

powerpc/44x: Add support for the AMCC APM821xx SoC

2010-10-13 08:47:09 -04:00

cpu_setup_a2.S

powerpc: Enforce usage of RA 0-R31 where possible

2012-07-10 19:18:35 +10:00

cpu_setup_fsl_booke.S

powerpc/booke: Add CPU_FTR_EMB_HV check for e5500.

2012-09-12 14:57:09 -05:00

cpu_setup_pa6t.S

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cpu_setup_power.S

powerpc: Set DSCR bit in FSCR setup

2013-03-05 16:56:30 +11:00

cpu_setup_ppc970.S

powerpc, KVM: Split HVMODE_206 cpu feature bit into separate HV and architecture bits

2011-07-12 13:16:58 +03:00

cputable.c

powerpc: Fix cputable entry for 970MP rev 1.0

2013-03-13 10:06:46 +11:00

crash_dump.c

powerpc: Rename mapping based RELOCATABLE to DYNAMIC_MEMSTART for BookE

2011-12-20 10:20:19 -05:00

crash.c

Disintegrate asm/system.h for PowerPC

2012-03-28 18:30:02 +01:00

dbell.c

powerpc: Define differences between doorbells on book3e and book3s

2013-01-10 15:09:05 +11:00

dma-iommu.c

powerpc/dma-iommu: Fix IOMMU window check

2012-08-24 20:26:07 +10:00

dma-swiotlb.c

powerpc/swiotlb: Enable at early stage and disable if not necessary

2012-09-12 14:57:09 -05:00

dma.c

powerpc/kernel: Remove uses of abs_to_virt() and virt_to_abs()

2012-09-05 15:19:30 +10:00

entry_32.S

powerpc: Fix MAX_STACK_TRACE_ENTRIES too low warning for ppc32

2013-01-29 10:10:22 +11:00

entry_64.S

Merge branch 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/benh/powerpc

2013-02-23 17:09:55 -08:00

epapr_hcalls.S

KVM: PPC: ev_idle hcall support for e500 guests

2012-10-05 23:38:37 +02:00

epapr_paravirt.c

KVM: PPC: ev_idle hcall support for e500 guests

2012-10-05 23:38:37 +02:00

exceptions-64e.S

powerpc: Move branch instruction from ACCOUNT_CPU_USER_ENTRY to caller

2013-01-10 17:00:59 +11:00

exceptions-64s.S

powerpc: Rename USER_ESID_BITS* to ESID_BITS*

2013-03-17 12:45:44 +11:00

fadump.c

powerpc: Change memory_limit from phys_addr_t to unsigned long long

2012-09-07 11:44:30 +10:00

firmware.c

powerpc: fix implicit use of cache.h in kernel/firmware.c

2011-10-31 19:30:41 -04:00

fpu.S

powerpc: Add FP/VSX and VMX register load functions for transactional memory

2013-02-15 16:58:52 +11:00

fsl_booke_entry_mapping.S

powerpc/fsl-booke: Fix address issue when using relocatable kernels

2010-07-11 11:04:08 -05:00

ftrace.c

powerpc/ftrace: Trace function graph entry before updating index

2012-07-27 11:42:34 +10:00

head_8xx.S

powerpc: Call do_page_fault() with interrupts off

2012-03-09 10:55:08 +11:00

head_32.S

powerpc: Call do_page_fault() with interrupts off

2012-03-09 10:55:08 +11:00

head_40x.S

powerpc: Enable the Watchdog vector for 405

2013-01-10 14:43:46 +11:00

head_44x.S

Merge branch 'next' of git://git.kernel.org/pub/scm/virt/kvm/kvm

2012-05-24 16:17:30 -07:00

head_64.S

powerpc/kexec: Add kexec "hold" support for Book3e processors

2013-01-10 17:00:39 +11:00

head_booke.h

KVM: PPC: booke: category E.HV (GS-mode) support

2012-04-08 12:51:19 +03:00

head_fsl_booke.S

powepc/booke: Separate out E.HV check and ivor setup code.

2012-09-12 14:57:08 -05:00

hw_breakpoint.c

powerpc: Change hardware breakpoint to allow longer ranges

2013-01-29 11:35:08 +11:00

ibmebus.c

powerpc: Remove all includes of <asm/abs_addr.h>

2012-09-05 15:19:33 +10:00

idle_6xx.S

powerpc: Use CURRENT_THREAD_INFO instead of open coded assembly

2012-07-11 14:18:22 +10:00

idle_book3e.S

powerpc: Use CURRENT_THREAD_INFO instead of open coded assembly

2012-07-11 14:18:22 +10:00

idle_e500.S

powerpc: Use CURRENT_THREAD_INFO instead of open coded assembly

2012-07-11 14:18:22 +10:00

idle_power4.S

powerpc: Use CURRENT_THREAD_INFO instead of open coded assembly

2012-07-11 14:18:22 +10:00

idle_power7.S

powerpc/powernv: Always go into nap mode when CPU is offline

2012-09-05 16:05:20 +10:00

idle.c

powerpc: Remove no longer used ppc_md.idle_loop()

2012-11-15 13:00:20 +11:00

io-workarounds.c

POWERPC: drivers: remove __dev* attributes.

2013-01-03 15:57:04 -08:00

io.c

powerpc: various straight conversions from module.h --> export.h

2011-10-31 19:30:44 -04:00

iomap.c

powerpc: switch to GENERIC_PCI_IOMAP

2011-11-28 21:13:18 +02:00

iommu.c

powerpc/iommu: Prevent false TCE leak message

2013-01-10 17:01:53 +11:00

irq.c

powerpc: Add code to handle soft-disabled doorbells on server

2013-01-10 15:09:07 +11:00

isa-bridge.c

POWERPC: drivers: remove __dev* attributes.

2013-01-03 15:57:04 -08:00

jump_label.c

powerpc: Fix build breakage in jump_label.c

2011-11-16 14:25:19 +11:00

kgdb.c

Merge branch 'merge' into next

2013-01-29 11:33:37 +11:00

kprobes.c

hlist: drop the node parameter from iterators

2013-02-27 19:10:24 -08:00

kvm_emul.S

KVM: PPC: Not optimizing MSR_CE and MSR_ME with paravirt.

2012-05-30 11:43:11 +02:00

kvm.c

KVM: PPC: use definitions in epapr header for hcalls

2012-10-05 23:38:36 +02:00

l2cr_6xx.S

Fix common misspellings

2011-03-31 11:26:23 -03:00

legacy_serial.c

Fix misspellings of "whether" in comments.

2012-11-19 14:31:35 +01:00

lparcfg.c

Disintegrate asm/system.h for PowerPC

2012-03-28 18:30:02 +01:00

machine_kexec_32.c

treewide: convert uses of ATTRIB_NORETURN to __noreturn

2012-01-12 20:13:03 -08:00

machine_kexec_64.c

powerpc/kexec: Disable hard IRQ before kexec

2013-02-24 03:49:28 +11:00

machine_kexec.c

powerpc+of: Rename the drivers/of prom_* functions to of_*

2012-11-15 12:56:52 +11:00

Makefile

powerpc: Add helper functions for transactional memory context switching

2013-02-15 16:58:52 +11:00

misc_32.S

powerpc: split ret_from_fork

2012-09-30 23:31:19 -04:00

misc_64.S

powerpc: split ret_from_fork

2012-09-30 23:31:19 -04:00

misc.S

powerpc: switch to generic sys_execve()/kernel_execve()

2012-09-30 23:35:51 -04:00

module_32.c

powerpc: Fix kernel panic during kernel module load

2012-06-08 19:59:08 +10:00

module_64.c

powerpc: Build kernel with -mcmodel=medium

2013-01-10 17:00:31 +11:00

module.c

powerpc: remove non-required uses of include <linux/module.h>

2011-10-31 19:30:44 -04:00

msi.c

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nvram_64.c

powerpc/nvram: Generalize code for OS partitions in NVRAM

2011-03-04 18:19:04 +11:00

of_platform.c

powerpc/eeh: Fix crash when adding a device in a slot with DDW

2013-01-10 17:01:58 +11:00

paca.c

powerpc: Move boot_paca into early_setup

2013-02-15 16:54:48 +11:00

pci_32.c

POWERPC: drivers: remove __dev* attributes.

2013-01-03 15:57:04 -08:00

pci_64.c

POWERPC: drivers: remove __dev* attributes.

2013-01-03 15:57:04 -08:00

pci_dn.c

POWERPC: drivers: remove __dev* attributes.

2013-01-03 15:57:04 -08:00

pci_of_scan.c

POWERPC: drivers: remove __dev* attributes.

2013-01-03 15:57:04 -08:00

pci-common.c

powerpc/eeh: Fix crash when adding a device in a slot with DDW

2013-01-10 17:01:58 +11:00

pmc.c

bug.h: add include of it to various implicit C users

2012-02-29 17:15:08 -05:00

ppc32.h

powerpc: switch to generic old sigaction()

2013-02-03 18:16:10 -05:00

ppc_ksyms.c

Merge remote-tracking branch 'master' into queue

2012-10-29 19:15:32 -02:00

ppc_save_regs.S

Fix common misspellings

2011-03-31 11:26:23 -03:00

proc_powerpc.c

new helper: file_inode(file)

2013-02-22 23:31:31 -05:00

process.c

powerpc: Hook in new transactional memory code

2013-02-15 17:02:23 +11:00

prom_init_check.sh

powerpc: Relocate prom_init.c on 64bit

2013-01-10 17:00:25 +11:00

prom_init.c

powerpc: Fix -mcmodel=medium breakage in prom_init.c

2013-03-13 10:06:52 +11:00

prom_parse.c

powerpc: remove non-required uses of include <linux/module.h>

2011-10-31 19:30:44 -04:00

prom.c

Merge branch 'dt' into next

2012-11-15 15:02:44 +11:00

ptrace32.c

powerpc: Hardware breakpoints rewrite to handle non DABR breakpoint registers

2013-01-10 17:01:44 +11:00

ptrace.c

powerpc/ptrace: Fix brk.len used uninitialised

2013-03-17 12:35:06 +11:00

reloc_32.S

powerpc: Process dynamic relocations for kernel

2011-12-20 10:21:08 -05:00

reloc_64.S

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rtas_flash.c

new helper: file_inode(file)

2013-02-22 23:31:31 -05:00

rtas_pci.c

POWERPC: drivers: remove __dev* attributes.

2013-01-03 15:57:04 -08:00

rtas-proc.c

powerpc: Move /proc/ppc64 to /proc/powerpc update

2010-01-15 13:26:17 +11:00

rtas-rtc.c

powerpc/rtas-rtc: remove sideeffects of printk_ratelimit

2011-06-29 15:30:43 +10:00

rtas.c

powerpc+of: Remove the pSeries_reconfig.h file

2012-11-15 12:56:55 +11:00

rtasd.c

powerpc/pseries: Cancel RTAS event scan before firmware flash

2011-11-25 14:11:29 +11:00

setup_32.c

powerpc/watchdog: move booke watchdog param related code to setup-common.c

2012-07-11 07:44:03 -05:00

setup_64.c

powerpc: Apply early paca fixups to boot_paca and the boot cpu's paca

2013-02-15 16:55:06 +11:00

setup-common.c

powerpc/watchdog: move booke watchdog param related code to setup-common.c

2012-07-11 07:44:03 -05:00

setup.h

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signal_32.c

Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/signal

2013-02-23 18:50:11 -08:00

signal_64.c

Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/signal

2013-02-23 18:50:11 -08:00

signal.c

Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/signal

2013-02-23 18:50:11 -08:00

signal.h

powerpc: Add new transactional memory state to the signal context

2013-02-15 17:02:23 +11:00

smp-tbsync.c

POWERPC: drivers: remove __dev* attributes.

2013-01-03 15:57:04 -08:00

smp.c

powerpc: fix ics_rtas_init and start_secondary section mismatch

2013-02-08 14:05:48 +11:00

softemu8xx.c

Disintegrate asm/system.h for PowerPC

2012-03-28 18:30:02 +01:00

stacktrace.c

powerpc: various straight conversions from module.h --> export.h

2011-10-31 19:30:44 -04:00

suspend.c

update email address

2010-07-19 10:56:54 +02:00

swsusp_32.S

Fix common misspellings

2011-03-31 11:26:23 -03:00

swsusp_64.c

Disintegrate asm/system.h for PowerPC

2012-03-28 18:30:02 +01:00

swsusp_asm64.S

…

swsusp_booke.S

powerpc/fsl-booke: Add hibernation support for FSL BookE processors

2010-05-21 07:41:53 -05:00

swsusp.c

Disintegrate asm/system.h for PowerPC

2012-03-28 18:30:02 +01:00

sys_ppc32.c

fix compat truncate/ftruncate

2013-02-25 09:24:55 -05:00

syscalls.c

powerpc: Fix personality handling in ppc64_personality()

2012-08-24 20:26:07 +10:00

sysfs.c

numa: convert static memory to dynamically allocated memory for per node device

2012-12-11 17:22:23 -08:00

systbl_chk.c

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systbl_chk.sh

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systbl.S

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tau_6xx.c

tree-wide: fix assorted typos all over the place

2009-12-04 15:39:55 +01:00

time.c

Merge branch 'timers-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

2013-02-19 19:05:45 -08:00

tm.S

powerpc: Add helper functions for transactional memory context switching

2013-02-15 16:58:52 +11:00

traps.c

Merge tag 'modules-next-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/rusty/linux

2013-02-25 15:41:43 -08:00

udbg_16550.c

powerpc: Add early debug for WSP platforms

2011-05-06 13:32:41 +10:00

udbg.c

powerpc/udbg: Remove unused udbg_read()

2012-11-15 12:59:33 +11:00

uprobes.c

uprobes/powerpc: Do not use arch_uprobe_*_step() helpers

2012-11-03 17:15:12 +01:00

vdso.c

powerpc: Add VDSO version of time

2013-04-23 16:05:05 +10:00

vecemu.c

…

vector.S

powerpc: Add FP/VSX and VMX register load functions for transactional memory

2013-02-15 16:58:52 +11:00

vio.c

POWERPC: drivers: remove __dev* attributes.

2013-01-03 15:57:04 -08:00

vmlinux.lds.S

powerpc: Relocate prom_init.c on 64bit

2013-01-10 17:00:25 +11:00