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f5f0307f42d39a51a925ca4841f76a2f2ea330ff
linux/arch/powerpc/kernel
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Anton Blanchard f5f0307f42 powerpc: Improve scheduling of system call entry instructions 
After looking at our system call path, Mary Brown suggested that we
should put all mfspr SRR* instructions before any mtspr SRR*.

To test this I used a very simple null syscall (actually getppid)
testcase at http://ozlabs.org/~anton/junkcode/null_syscall.c

I tested with the following changes against the pseries_defconfig:

CONFIG_VIRT_CPU_ACCOUNTING=n
CONFIG_AUDIT=n

to remove the overhead of virtual CPU accounting and syscall
auditing.

POWER6:
baseline:       mean = 757.2 cycles       sd = 2.108
modified:       mean = 759.1 cycles       sd = 2.020

POWER7:
baseline:       mean = 411.4 cycles       sd = 0.138
modified:       mean = 404.1 cycles       sd = 0.109

So we have 1.77% improvement on POWER7 which looks significant. The
POWER6 suggest a 0.25% slowdown, but the results are within 1
standard deviation and may be in the noise.

Signed-off-by: Anton Blanchard <anton@samba.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2011-05-19 14:30:42 +10:00
..
vdso32
Fix common misspellings
2011-03-31 11:26:23 -03:00
vdso64
Fix common misspellings
2011-03-31 11:26:23 -03:00
.gitignore
…
align.c
powerpc: Remove fpscr use from [kvm_]cvt_{fd,df}
2010-09-02 14:07:32 +10:00
asm-offsets.c
powerpc: Per process DSCR + some fixes (try#4)
2011-04-27 14:18:19 +10:00
audit.c
…
btext.c
Fix common misspellings
2011-03-31 11:26:23 -03:00
cacheinfo.c
include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h
2010-03-30 22:02:32 +09:00
cacheinfo.h
powerpc: Rewrite sysfs processor cache info code
2009-01-08 16:25:10 +11:00
clock.c
…
compat_audit.c
…
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: Add A2 cpu support
2011-04-27 13:02:02 +10:00
cpu_setup_fsl_booke.S
rapidio: modify configuration to support PCI-SRIO controller
2011-03-23 19:46:42 -07:00
cpu_setup_pa6t.S
…
cpu_setup_power7.S
powerpc: Initialize TLB and LPID register on HV mode Power7
2011-04-20 11:03:24 +10:00
cpu_setup_ppc970.S
…
cputable.c
powerpc: Free up some CPU feature bits by moving out MMU-related features
2011-04-27 14:18:52 +10:00
crash_dump.c
crash_dump: export is_kdump_kernel to modules, consolidate elfcorehdr_addr, setup_elfcorehdr and saved_max_pfn
2011-03-23 19:47:19 -07:00
crash.c
powerpc/kexec: Fix build failure on 32-bit SMP
2011-05-04 15:22:59 +10:00
dbell.c
powerpc/book3e: Resend doorbell exceptions to ourself
2010-07-09 16:11:19 +10:00
dma-iommu.c
powerpc/iommu: Use coherent_dma_mask for alloc_coherent
2010-12-09 15:17:50 +11:00
dma-swiotlb.c
of: Merge of_platform_bus_type with platform_bus_type
2010-07-24 09:57:51 -06:00
dma.c
powerpc: Implement dma_mmap_coherent()
2011-03-30 10:44:00 +11:00
e500-pmu.c
perf, arch: Cleanup perf-pmu init vs lockup-detector
2010-11-26 15:14:56 +01:00
entry_32.S
powerpc/ppc32/tracing: Add stack frame to calls of trace_hardirqs_on/off
2011-01-21 14:08:33 +11:00
entry_64.S
powerpc: Free up some CPU feature bits by moving out MMU-related features
2011-04-27 14:18:52 +10:00
exceptions-64e.S
powerpc: Add early debug for WSP platforms
2011-05-06 13:32:41 +10:00
exceptions-64s.S
powerpc: Improve scheduling of system call entry instructions
2011-05-19 14:30:42 +10:00
firmware.c
powerpc: Make powerpc_firmware_features __read_mostly
2010-02-09 13:56:07 +11:00
fpu.S
powerpc: Remove second definition of STACK_FRAME_OVERHEAD
2010-11-29 15:48:23 +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
Merge branch 'tracing-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip
2009-06-20 10:56:46 -07:00
head_8xx.S
powerpc: Remove second definition of STACK_FRAME_OVERHEAD
2010-11-29 15:48:23 +11:00
head_32.S
powerpc/smp: soft-replugged CPUs must go back to start_secondary
2011-04-01 15:37:09 +11:00
head_40x.S
Fix common misspellings
2011-03-31 11:26:23 -03:00
head_44x.S
Fix common misspellings
2011-03-31 11:26:23 -03:00
head_64.S
powerpc: Use MSR_64BIT in places
2011-04-27 14:18:44 +10:00
head_booke.h
powerpc/booke: Add Stack Marking support to Booke Exception Prolog
2010-05-05 08:01:52 -04:00
head_fsl_booke.S
Fix common misspellings
2011-03-31 11:26:23 -03:00
hw_breakpoint.c
powerpc, hw_breakpoint: Tell generic code we have no instruction breakpoints
2010-06-30 13:54:58 +10:00
ibmebus.c
PM / Hibernate: Introduce CONFIG_HIBERNATE_CALLBACKS
2011-04-11 22:54:42 +02:00
idle_6xx.S
…
idle_book3e.S
powerpc/book3e: Add generic 64-bit idle powersave support
2010-07-14 14:13:18 +10:00
idle_e500.S
…
idle_power4.S
powerpc/pmac/smp: Properly NAP offlined CPU on G5
2011-04-01 15:37:25 +11:00
idle_power7.S
powerpc: Add NAP mode support on Power7 in HV mode
2011-04-20 11:03:24 +10:00
idle.c
powerpc: Re-enable preemption before cpu_die()
2010-08-24 15:26:29 +10:00
init_task.c
Use new __init_task_data macro in arch init_task.c files.
2009-09-21 06:27:08 +02:00
io-workarounds.c
powerpc/pci: Properly initialize IO workaround "private"
2011-04-27 14:18:33 +10:00
io.c
powerpc: tiny memcpy_(to|from)io optimisation
2009-11-04 16:43:12 -07:00
iomap.c
…
iommu.c
powerpc: iommu: Add device name to iommu error printks
2010-12-09 15:35:32 +11:00
irq.c
powerpc/irq: Stop exporting irq_map
2011-05-04 15:02:15 +10:00
isa-bridge.c
…
kgdb.c
kgdb,ppc: Fix regression in evr register handling
2010-11-17 13:54:58 -06:00
kprobes.c
powerpc/kprobes: Remove resume_execution() in kprobes
2010-06-02 17:50:37 +10:00
kvm_emul.S
KVM: PPC: Make PV mtmsrd L=1 work with r30 and r31
2010-10-24 10:52:14 +02:00
kvm.c
PPC: KVM: Book E doesn't have __end_interrupts.
2010-11-05 14:42:27 -02:00
l2cr_6xx.S
Fix common misspellings
2011-03-31 11:26:23 -03:00
legacy_serial.c
powerpc: Check device status before adding serial device
2011-04-12 06:29:21 -05:00
lparcfg.c
powerpc/pseries: Add page coalescing support
2011-05-04 16:02:21 +10:00
machine_kexec_32.c
powerpc/kexec: make masking/disabling interrupts generic
2010-10-14 00:52:46 -05:00
machine_kexec_64.c
powerpc/kexec: Fix orphaned offline CPUs across kexec
2010-07-31 15:05:22 +10:00
machine_kexec.c
powerpc: Convert to new irq_* function names
2011-03-29 14:48:12 +02:00
Makefile
powerpc: Remove unused config in the Makefile
2011-05-19 14:30:40 +10:00
misc_32.S
powerpc: Remove second definition of STACK_FRAME_OVERHEAD
2010-11-29 15:48:23 +11:00
misc_64.S
powerpc: Remove second definition of STACK_FRAME_OVERHEAD
2010-11-29 15:48:23 +11:00
misc.S
powerpc: Remove unneeded cpu_setup/restore from POWER7 cputable entry
2010-11-29 15:48:22 +11:00
module_32.c
…
module_64.c
powerpc: Unify opcode definitions and support
2009-02-23 10:48:56 +11:00
module.c
powerpc: remove unused variable
2010-10-05 17:27:54 -07:00
mpc7450-pmu.c
perf, arch: Cleanup perf-pmu init vs lockup-detector
2010-11-26 15:14:56 +01:00
msi.c
powerpc/PCI: include pci.h in powerpc MSI implementation
2009-03-25 08:54:29 -07:00
nvram_64.c
powerpc/nvram: Generalize code for OS partitions in NVRAM
2011-03-04 18:19:04 +11:00
of_platform.c
dt/powerpc: Eliminate users of of_platform_{,un}register_driver
2011-02-28 01:36:39 -07:00
paca.c
powerpc: In HV mode, use HSPRG0 for PACA
2011-04-20 11:03:22 +10:00
pci_32.c
powerpc/pci: Make both ppc32 and ppc64 use sysdata for pci_controller
2011-02-04 11:46:51 -07:00
pci_64.c
powerpc/pci: Make both ppc32 and ppc64 use sysdata for pci_controller
2011-02-04 11:46:51 -07:00
pci_dn.c
powerpc/pci: Fix crash in PCI code on ppc64 when matching device nodes
2011-03-21 10:57:57 +11:00
pci_of_scan.c
powerpc/pci: Make both ppc32 and ppc64 use sysdata for pci_controller
2011-02-04 11:46:51 -07:00
pci-common.c
powerpc: Convert to new irq_* function names
2011-03-29 14:48:12 +02:00
perf_callchain.c
perf: Factorize callchain context handling
2010-08-19 01:32:11 +02:00
perf_event_fsl_emb.c
powerpc, perf: Fix frequency calculation for overflowing counters (FSL version)
2011-01-19 20:05:42 +01:00
perf_event.c
powerpc/perf_event: Skip updating kernel counters if register value shrinks
2011-04-18 13:08:23 +10:00
pmc.c
powerpc: Convert pmc_owner_lock to raw_spinlock
2010-02-19 14:52:33 +11:00
power4-pmu.c
perf, arch: Cleanup perf-pmu init vs lockup-detector
2010-11-26 15:14:56 +01:00
power5-pmu.c
perf, arch: Cleanup perf-pmu init vs lockup-detector
2010-11-26 15:14:56 +01:00
power5+-pmu.c
perf, arch: Cleanup perf-pmu init vs lockup-detector
2010-11-26 15:14:56 +01:00
power6-pmu.c
perf, arch: Cleanup perf-pmu init vs lockup-detector
2010-11-26 15:14:56 +01:00
power7-pmu.c
perf, arch: Cleanup perf-pmu init vs lockup-detector
2010-11-26 15:14:56 +01:00
ppc32.h
…
ppc970-pmu.c
perf, arch: Cleanup perf-pmu init vs lockup-detector
2010-11-26 15:14:56 +01:00
ppc_ksyms.c
powerpc: Simplify 4k/64k copy_page logic
2011-05-19 14:30:42 +10:00
ppc_save_regs.S
Fix common misspellings
2011-03-31 11:26:23 -03:00
proc_powerpc.c
include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h
2010-03-30 22:02:32 +09:00
process.c
powerpc: Free up some CPU feature bits by moving out MMU-related features
2011-04-27 14:18:52 +10:00
prom_init_check.sh
powerpc: Fix compile errors in prom_init_check for gcc 4.5
2010-07-08 18:11:39 +10:00
prom_init.c
powerpc/pseries: Add page coalescing support
2011-05-04 16:02:21 +10:00
prom_parse.c
of/pci: move of_irq_map_pci() into generic code
2011-02-04 11:46:50 -07:00
prom.c
powerpc: Free up some CPU feature bits by moving out MMU-related features
2011-04-27 14:18:52 +10:00
ptrace32.c
powerpc: Update compat_arch_ptrace
2010-12-09 15:35:32 +11:00
ptrace.c
Fix common misspellings
2011-03-31 11:26:23 -03:00
reloc_64.S
…
rtas_flash.c
powerpc/rtas_flash: Use simple_read_from_buffer
2011-01-21 14:08:34 +11:00
rtas_pci.c
powerpc/pci: Clean up direct access to sysdata by RTAS
2009-05-21 15:44:23 +10:00
rtas-proc.c
powerpc: Move /proc/ppc64 to /proc/powerpc update
2010-01-15 13:26:17 +11:00
rtas-rtc.c
…
rtas.c
powerpc/pseries: Add page coalescing support
2011-05-04 16:02:21 +10:00
rtasd.c
Fix common misspellings
2011-03-31 11:26:23 -03:00
setup_32.c
powerpc: Properly handshake CPUs going out of boot spin loop
2011-04-20 11:03:24 +10:00
setup_64.c
powerpc: Rename slb0_limit() to safe_stack_limit() and add Book3E support
2011-05-06 13:32:24 +10:00
setup-common.c
powerpc: Convert old cpumask API into new one
2011-05-04 15:22:59 +10:00
setup.h
…
signal_32.c
powerpc: fix double syscall restarts
2010-09-22 09:33:50 -07:00
signal_64.c
powerpc: Use MSR_64BIT in places
2011-04-27 14:18:44 +10:00
signal.c
powerpc: fix double syscall restarts
2010-09-22 09:33:50 -07:00
signal.h
powerpc: Sanitize stack pointer in signal handling code
2009-03-27 16:58:24 +11:00
smp-tbsync.c
include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h
2010-03-30 22:02:32 +09:00
smp.c
powerpc: Convert old cpumask API into new one
2011-05-04 15:22:59 +10:00
softemu8xx.c
include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h
2010-03-30 22:02:32 +09:00
stacktrace.c
…
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
…
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
…
sys_ppc32.c
BKL: remove extraneous #include <smp_lock.h>
2010-11-17 08:59:32 -08:00
syscalls.c
Add generic sys_olduname()
2010-03-12 15:52:32 -08:00
sysfs.c
powerpc: Per process DSCR + some fixes (try#4)
2011-04-27 14:18:19 +10:00
systbl_chk.c
…
systbl_chk.sh
…
systbl.S
…
tau_6xx.c
tree-wide: fix assorted typos all over the place
2009-12-04 15:39:55 +01:00
time.c
powerpc: Fix oops if scan_dispatch_log is called too early
2011-04-18 13:08:19 +10:00
traps.c
powerpc: Convert old cpumask API into new one
2011-05-04 15:22:59 +10:00
udbg_16550.c
powerpc: Add early debug for WSP platforms
2011-05-06 13:32:41 +10:00
udbg.c
powerpc: Add early debug for WSP platforms
2011-05-06 13:32:41 +10:00
vdso.c
mm: arch: rename in_gate_area_no_task to in_gate_area_no_mm
2011-03-23 16:36:55 -04:00
vecemu.c
…
vector.S
powerpc: Remove static branch hint in giveup_altivec
2011-05-19 14:30:42 +10:00
vio.c
powerpc/iommu: Use coherent_dma_mask for alloc_coherent
2010-12-09 15:17:50 +11:00
vmlinux.lds.S
percpu: align percpu readmostly subsection to cacheline
2011-01-25 14:26:50 +01:00