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Peter Zijlstra 8f4d37ec07 sched: high-res preemption tick 
Use HR-timers (when available) to deliver an accurate preemption tick.

The regular scheduler tick that runs at 1/HZ can be too coarse when nice
level are used. The fairness system will still keep the cpu utilisation 'fair'
by then delaying the task that got an excessive amount of CPU time but try to
minimize this by delivering preemption points spot-on.

The average frequency of this extra interrupt is sched_latency / nr_latency.
Which need not be higher than 1/HZ, its just that the distribution within the
sched_latency period is important.

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
2008-01-25 21:08:29 +01:00
..
mach-bigsmp
mach-default x86: fix reboot with no keyboard attached 2007-11-17 16:27:01 +01:00
mach-es7000 x86: fix bogus memcpy in es7000_check_dsdt() 2007-11-17 16:27:00 +01:00
mach-generic
mach-numaq
mach-summit
mach-visws x86: visws extern inline to static inline 2007-10-17 20:16:39 +02:00
mach-voyager x86: voyager use correct header file name 2007-11-17 16:27:00 +01:00
xen
a.out.h x86: unify a.out{,_32,_64}.h 2007-10-23 22:37:23 +02:00
acpi.h ACPI: Set max_cstate to 1 for early Opterons. 2007-11-26 20:42:19 +01:00
acpi_32.h x86: Unify i386 and x86-64 early quirks 2007-10-19 20:35:03 +02:00
acpi_64.h
agp.h x86: unify include/asm/agp_32/64.h 2007-10-17 20:17:12 +02:00
alternative-asm.h x86: rename .i assembler includes to .h 2007-10-17 20:16:29 +02:00
alternative.h
alternative_32.h
alternative_64.h
apic.h
apic_32.h x86: fix ACPI compile for LOCAL_APIC=n 2007-11-26 20:42:19 +01:00
apic_64.h x86: add lapic_shutdown for x86_64 2007-10-23 22:37:22 +02:00
apicdef.h
apicdef_32.h
apicdef_64.h
arch_hooks.h
atomic.h
atomic_32.h
atomic_64.h x86: make atomic64_t work like atomic_t 2007-10-17 20:16:21 +02:00
auxvec.h x86: unify include/asm/auxvec_32/64.h 2007-10-17 20:17:13 +02:00
bitops.h
bitops_32.h bitops kernel-doc: inline instead of macro 2007-10-25 16:16:26 -07:00
bitops_64.h x86 bitops: fix code style issues 2007-10-25 16:16:26 -07:00
boot.h
bootparam.h Make asm-x86/bootparam.h includable from userspace. 2007-10-23 15:49:47 +10:00
bug.h x86: unify include/asm/bug_32/64.h 2007-10-17 20:26:16 +02:00
bugs.h x86: unify some more trivial include/asm-x86/ 32/64 variants 2007-10-17 20:17:10 +02:00
byteorder.h x86: fix asm-x86/byteorder.h for userspace export 2008-01-01 19:12:15 +01:00
cache.h x86: unify include/asm/cache_32/64.h 2007-10-17 20:17:15 +02:00
cacheflush.h Intel IOMMU: clflush_cache_range now takes size param 2007-10-22 08:13:18 -07:00
calgary.h
calling.h
checksum.h
checksum_32.h
checksum_64.h
cmpxchg.h
cmpxchg_32.h
cmpxchg_64.h
compat.h x86: Use linux/elfcore-compat.h 2007-10-19 20:35:02 +02:00
cpu.h i386: no need to make enable_cpu_hotplug a variable 2007-10-17 20:16:16 +02:00
cpufeature.h
cpufeature_32.h I/OAT: Add DCA services 2007-10-16 09:43:09 -07:00
cpufeature_64.h minimal build fixes for uml (fallout from x86 merge) 2007-10-13 09:57:15 -07:00
cputime.h x86: trivial header merges 2007-10-17 20:17:08 +02:00
current.h
current_32.h
current_64.h
debugreg.h x86: unify include/asm/debugreg_32/64.h 2007-10-17 20:35:37 +02:00
delay.h x86: unify include/asm/delay_32/64.h 2007-10-17 20:17:17 +02:00
desc.h
desc_32.h
desc_64.h x86: use descriptor's functions instead of inline assembly 2007-10-19 20:35:03 +02:00
desc_defs.h
device.h intel-iommu: fix for IOMMU early crash 2007-10-22 08:13:19 -07:00
div64.h x86: unify div64{,_32,_64}.h 2007-10-23 22:37:23 +02:00
dma-mapping.h
dma-mapping_32.h Change table chaining layout 2007-10-22 21:20:01 +02:00
dma-mapping_64.h x86-64: enable sg chaining 2007-10-16 11:26:02 +02:00
dma.h
dma_32.h
dma_64.h
dmi.h x86: unify include/asm/dmi_32/64.h 2007-10-17 20:17:18 +02:00
dwarf2.h
dwarf2_32.h
dwarf2_64.h
e820.h Make asm-x86/bootparam.h includable from userspace. 2007-10-23 15:49:47 +10:00
e820_32.h Make asm-x86/bootparam.h includable from userspace. 2007-10-23 15:49:47 +10:00
e820_64.h Make asm-x86/bootparam.h includable from userspace. 2007-10-23 15:49:47 +10:00
edac.h x86: unify include/asm/cache_32/64.h 2007-10-17 20:17:19 +02:00
elf.h x86: merge elf_32/64.h 2007-10-23 22:37:23 +02:00
emergency-restart.h
errno.h x86: trivial header merges 2007-10-17 20:17:08 +02:00
fb.h x86: unify include/asm/cache_32/64.h 2007-10-17 20:17:21 +02:00
fcntl.h
fixmap.h
fixmap_32.h
fixmap_64.h
floppy.h x86: unify include/asm/floppy_32/64.h 2007-10-17 20:24:56 +02:00
fpu32.h
frame.h x86: rename .i assembler includes to .h 2007-10-17 20:16:29 +02:00
futex.h
futex_32.h
futex_64.h
gart.h x86 gart: rename symbols only used for the GART implementation 2007-10-30 00:22:22 +01:00
genapic.h
genapic_32.h
genapic_64.h
geode.h GEODE: use symbolic constant in cs5536 reboot fixup 2007-10-19 20:35:02 +02:00
hardirq.h
hardirq_32.h x86: expand /proc/interrupts to include missing vectors, v2 2007-10-17 20:16:53 +02:00
hardirq_64.h
highmem.h
hpet.h x86: disable hpet on shutdown 2007-12-03 17:17:10 +01:00
hw_irq.h
hw_irq_32.h
hw_irq_64.h x86: Add parenthesis to IRQ vector macros 2007-10-17 20:16:28 +02:00
hypertransport.h
i387.h
i387_32.h
i387_64.h x86: fix taking DNA during 64bit sigreturn 2007-11-12 11:09:33 -08:00
i8253.h i386: Remove the useless #ifdef in i8253.h 2007-10-12 23:04:23 +02:00
i8259.h
ia32.h
ia32_unistd.h
ide.h ide: add CONFIG_IDE_ARCH_OBSOLETE_INIT 2007-10-20 00:32:32 +02:00
idle.h
intel_arch_perfmon.h x86: unify some more trivial include/asm-x86/ 32/64 variants 2007-10-17 20:17:10 +02:00
io.h
io_32.h x86: asm-i386/io.h fix constness 2007-10-17 20:16:40 +02:00
io_64.h Remove dma_cache_(wback|inv|wback_inv) functions 2007-10-17 08:42:57 -07:00
io_apic.h
io_apic_32.h i386: Expose IOAPIC register definitions even if CONFIG_X86_IO_APIC is not set 2007-10-13 10:18:17 +02:00
io_apic_64.h x86: Unify i386 and x86-64 early quirks 2007-10-19 20:35:03 +02:00
ioctl.h
ioctls.h x86: unify include/asm/ioctls_32/64.h 2007-10-17 20:26:11 +02:00
iommu.h x86 gart: rename iommu.h to gart.h 2007-10-30 00:22:22 +01:00
ipcbuf.h x86: unify some more trivial include/asm-x86/ 32/64 variants 2007-10-17 20:17:10 +02:00
ipi.h x86: convert cpu_to_apicid to be a per cpu variable 2007-10-19 20:35:03 +02:00
irq.h
irq_32.h i386: introduce "used_vectors" bitmap which can be used to reserve vectors. 2007-10-19 20:35:03 +02:00
irq_64.h
irq_regs.h
irq_regs_32.h
irq_regs_64.h
irqflags.h
irqflags_32.h lockdep: fixup irq tracing 2007-10-25 14:01:10 +02:00
irqflags_64.h lockdep: fixup irq tracing 2007-10-25 14:01:10 +02:00
ist.h Make asm-x86/bootparam.h includable from userspace. 2007-10-23 15:49:47 +10:00
k8.h
Kbuild x86: merge setup_32/64.h 2007-10-23 22:37:24 +02:00
kdebug.h x86: unify include/asm/kdebug_32/64.h 2007-10-17 20:26:12 +02:00
kexec.h
kexec_32.h
kexec_64.h
kmap_types.h x86: unify include/asm/agp_32/64.h 2007-10-17 20:26:13 +02:00
kprobes.h
kprobes_32.h x86: jprobe bugfix 2007-12-18 18:05:58 +01:00
kprobes_64.h x86: jprobe bugfix 2007-12-18 18:05:58 +01:00
ldt.h x86: unify include/asm/ldt_32/64.h 2007-10-17 20:16:47 +02:00
lguest.h Reorder guest saved regs to match hyperall order 2007-10-23 15:49:51 +10:00
lguest_hcall.h lguest: make async_hcall() static 2007-11-05 21:53:29 +11:00
linkage.h
linkage_32.h
linkage_64.h
local.h
local_32.h
local_64.h
mach_apic.h
math_emu.h
mc146818rtc.h
mc146818rtc_32.h
mc146818rtc_64.h
mca.h
mca_dma.h
mce.h x86: unify include/asm/mce_32/64.h 2007-10-17 20:16:44 +02:00
mman.h x86: unify include/asm/mman_32/64.h 2007-10-17 20:26:15 +02:00
mmsegment.h
mmu.h x86: merge mmu{,_32,_64}.h 2007-10-23 22:37:22 +02:00
mmu_context.h
mmu_context_32.h
mmu_context_64.h
mmx.h
mmzone.h
mmzone_32.h
mmzone_64.h
module.h
module_32.h
module_64.h
mpspec.h
mpspec_32.h
mpspec_64.h
mpspec_def.h
msgbuf.h x86: merge msgbuf_32/64.h 2007-10-23 22:37:24 +02:00
msidef.h
msr-index.h i386: i386 add AMD64 Barcelona PMU MSR definitions to msr.h 2007-10-19 20:35:03 +02:00
msr.h x86: asm-x86/msr.h: pull in linux/types.h 2008-01-15 16:44:38 +01:00
mtrr.h x86: merge mttr_32/64.h 2007-10-23 22:37:24 +02:00
mutex.h
mutex_32.h
mutex_64.h
namei.h x86: unify some more trivial include/asm-x86/ 32/64 variants 2007-10-17 20:17:10 +02:00
nmi.h
nmi_32.h
nmi_64.h
numa.h
numa_32.h
numa_64.h x86: clean up apicid_to_node declaration 2007-10-17 20:15:16 +02:00
numaq.h
page.h
page_32.h
page_64.h x86_64: SPARSEMEM_VMEMMAP 2M page size support 2007-10-16 09:42:51 -07:00
param.h x86: unify some more trivial include/asm-x86/ 32/64 variants 2007-10-17 20:17:10 +02:00
paravirt.h paravirt: clean up lazy mode handling 2007-10-16 11:51:29 -07:00
parport.h x86: unify some more trivial include/asm-x86/ 32/64 variants 2007-10-17 20:17:10 +02:00
pci-direct.h
pci.h PCI: merge almost all of pci_32.h and pci_64.h together 2007-10-12 15:03:20 -07:00
pci_32.h PCI: merge almost all of pci_32.h and pci_64.h together 2007-10-12 15:03:20 -07:00
pci_64.h x86 gart: rename CONFIG_IOMMU to CONFIG_GART_IOMMU 2007-10-30 00:22:22 +01:00
pda.h x86: expand /proc/interrupts to include missing vectors, v2 2007-10-17 20:16:53 +02:00
percpu.h
percpu_32.h
percpu_64.h
pgalloc.h
pgalloc_32.h
pgalloc_64.h
pgtable-2level-defs.h
pgtable-2level.h
pgtable-3level-defs.h paravirt: refactor struct paravirt_ops into smaller pv_*_ops 2007-10-16 11:51:29 -07:00
pgtable-3level.h
pgtable.h
pgtable_32.h remove asm/bitops.h includes 2007-10-19 11:53:41 -07:00
pgtable_64.h remove asm/bitops.h includes 2007-10-19 11:53:41 -07:00
poll.h
posix_types.h
posix_types_32.h
posix_types_64.h
prctl.h
processor-cyrix.h
processor-flags.h KVM: Use standard CR8 flags, and fix TPR definition 2007-10-13 10:18:19 +02:00
processor.h
processor_32.h x86: convert cpuinfo_x86 array to a per_cpu array 2007-10-19 20:35:04 +02:00
processor_64.h x86: convert cpuinfo_x86 array to a per_cpu array 2007-10-19 20:35:04 +02:00
proto.h x86: Unify i386 and x86-64 early quirks 2007-10-19 20:35:03 +02:00
ptrace-abi.h x86: unify include/asm/ptrace-abi_32/64.h 2007-10-17 20:16:45 +02:00
ptrace.h oprofile: fix oops on x86 32-bit 2007-11-14 18:45:44 -08:00
reboot.h
reboot_fixups.h
required-features.h x86: merge required-features.h 2007-10-23 22:37:24 +02:00
resource.h x86: trivial header merges 2007-10-17 20:17:08 +02:00
resume-trace.h
resume-trace_32.h
resume-trace_64.h
rio.h
rtc.h x86: trivial header merges 2007-10-17 20:17:08 +02:00
rwlock.h x86: unify some more trivial include/asm-x86/ 32/64 variants 2007-10-17 20:17:10 +02:00
rwsem.h
scatterlist.h
scatterlist_32.h Add CONFIG_DEBUG_SG sg validation 2007-10-22 21:20:03 +02:00
scatterlist_64.h Add CONFIG_DEBUG_SG sg validation 2007-10-22 21:20:03 +02:00
seccomp.h
seccomp_32.h
seccomp_64.h
sections.h x86: trivial header merges 2007-10-17 20:17:08 +02:00
segment.h
segment_32.h
segment_64.h
semaphore.h
semaphore_32.h kill DECLARE_MUTEX_LOCKED 2007-10-17 08:42:47 -07:00
semaphore_64.h kill DECLARE_MUTEX_LOCKED 2007-10-17 08:42:47 -07:00
sembuf.h x86: unify some more trivial include/asm-x86/ 32/64 variants 2007-10-17 20:17:10 +02:00
serial.h x86: merge some trivially mergeable headers 2007-10-17 20:17:09 +02:00
setup.h x86: clean up setup.h and the boot code 2007-10-23 22:37:25 +02:00
shmbuf.h x86: merge shmbuf_32/64.h 2007-10-23 22:37:24 +02:00
shmparam.h x86: unify some more trivial include/asm-x86/ 32/64 variants 2007-10-17 20:17:10 +02:00
sigcontext.h x86: merge sigcontext_32/64.h 2007-10-23 22:37:24 +02:00
sigcontext32.h
siginfo.h x86: unify include/asm/siginfo_32/64.h 2007-10-17 20:26:17 +02:00
signal.h x86: merge signal_32/64.h 2007-10-23 22:37:24 +02:00
smp.h
smp_32.h Revert "i386: export i386 smp_call_function_mask() to modules" 2007-10-27 20:57:43 +02:00
smp_64.h x86: add safe_smp_processor_id for x86_64 2007-10-23 22:37:23 +02:00
socket.h
sockios.h x86: merge some trivially mergeable headers 2007-10-17 20:17:09 +02:00
sparsemem.h
sparsemem_32.h
sparsemem_64.h
spinlock.h
spinlock_32.h
spinlock_64.h
spinlock_types.h
srat.h
stacktrace.h x86: constify stacktrace_ops 2007-10-17 20:16:11 +02:00
stat.h x86: merge stat_32/64.h 2007-10-23 22:37:24 +02:00
statfs.h x86: merge statfs_32/64.h 2007-10-23 22:37:24 +02:00
string.h
string_32.h i386: Remove strrchr assembler implementation 2007-10-17 20:16:23 +02:00
string_64.h
suspend.h
suspend_32.h
suspend_64.h x86: Save registers in saved_context during suspend and hibernation 2007-10-23 22:37:24 +02:00
swiotlb.h
sync_bitops.h
system.h
system_32.h i386: consolidate show_regs and show_registers for i386 2007-10-19 20:35:03 +02:00
system_64.h x86: also define AT_VECTOR_SIZE_ARCH 2007-12-18 18:05:58 +01:00
tce.h
termbits.h x86: unify some more trivial include/asm-x86/ 32/64 variants 2007-10-17 20:17:10 +02:00
termios.h x86: unify some more trivial include/asm-x86/ 32/64 variants 2007-10-17 20:17:10 +02:00
therm_throt.h
thread_info.h
thread_info_32.h sched: high-res preemption tick 2008-01-25 21:08:29 +01:00
thread_info_64.h sched: high-res preemption tick 2008-01-25 21:08:29 +01:00
time.h
timer.h
timex.h x86: unify timex.h variants 2007-10-12 23:04:23 +02:00
tlb.h x86: unify include/asm/tlb_32/64.h 2007-10-17 20:26:18 +02:00
tlbflush.h
tlbflush_32.h remove unused flush_tlb_pgtables 2007-10-19 11:53:34 -07:00
tlbflush_64.h remove unused flush_tlb_pgtables 2007-10-19 11:53:34 -07:00
topology.h
topology_32.h x86: convert cpuinfo_x86 array to a per_cpu array 2007-10-19 20:35:04 +02:00
topology_64.h Merge ssh://master.kernel.org/pub/scm/linux/kernel/git/tglx/linux-2.6-x86 2007-10-19 15:06:00 -07:00
tsc.h x86: unify timex.h variants 2007-10-12 23:04:23 +02:00
types.h x86: unify include/asm/types_32/64.h 2007-10-17 20:32:07 +02:00
uaccess.h
uaccess_32.h
uaccess_64.h
ucontext.h x86: unify some more trivial include/asm-x86/ 32/64 variants 2007-10-17 20:17:10 +02:00
unaligned.h x86: unify some more trivial include/asm-x86/ 32/64 variants 2007-10-17 20:17:10 +02:00
unistd.h
unistd_32.h
unistd_64.h x86: cleanup 64bit unistd.h 2007-10-17 20:16:36 +02:00
unwind.h x86: unify include/asm/unwind_32/64.h 2007-10-17 20:32:38 +02:00
user.h
user32.h
user_32.h
user_64.h
vga.h
vgtod.h
vic.h
vm86.h
vmi.h
vmi_time.h
voyager.h
vsyscall.h i386/x8664: cleanup the shared hpet code 2007-10-12 23:04:23 +02:00
vsyscall32.h
xor.h
xor_32.h
xor_64.h