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b466bdb614
linux/arch/x86/include/asm
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Huang Rui b466bdb614 x86/asm/delay: Introduce an MWAITX-based delay with a configurable timer 
MWAITX can enable a timer and a corresponding timer value
specified in SW P0 clocks. The SW P0 frequency is the same as
TSC. The timer provides an upper bound on how long the
instruction waits before exiting.

This way, a delay function in the kernel can leverage that
MWAITX timer of MWAITX.

When a CPU core executes MWAITX, it will be quiesced in a
waiting phase, diminishing its power consumption. This way, we
can save power in comparison to our default TSC-based delays.

A simple test shows that:

	$ cat /sys/bus/pci/devices/0000\:00\:18.4/hwmon/hwmon0/power1_acc
	$ sleep 10000s
	$ cat /sys/bus/pci/devices/0000\:00\:18.4/hwmon/hwmon0/power1_acc

Results:

	* TSC-based default delay:      485115 uWatts average power
	* MWAITX-based delay:           252738 uWatts average power

Thus, that's about 240 milliWatts less power consumption. The
test method relies on the support of AMD CPU accumulated power
algorithm in fam15h_power for which patches are forthcoming.

Suggested-by: Andy Lutomirski <luto@amacapital.net>
Suggested-by: Borislav Petkov <bp@suse.de>
Suggested-by: Peter Zijlstra <peterz@infradead.org>
Signed-off-by: Huang Rui <ray.huang@amd.com>
[ Fix delay truncation. ]
Signed-off-by: Borislav Petkov <bp@suse.de>
Cc: Aaron Lu <aaron.lu@intel.com>
Cc: Andreas Herrmann <herrmann.der.user@gmail.com>
Cc: Aravind Gopalakrishnan <Aravind.Gopalakrishnan@amd.com>
Cc: Fengguang Wu <fengguang.wu@intel.com>
Cc: Frédéric Weisbecker <fweisbec@gmail.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Hector Marco-Gisbert <hecmargi@upv.es>
Cc: Jacob Shin <jacob.w.shin@gmail.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: John Stultz <john.stultz@linaro.org>
Cc: Len Brown <lenb@kernel.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Rafael J. Wysocki <rjw@rjwysocki.net>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Tony Li <tony.li@amd.com>
Link: http://lkml.kernel.org/r/1438744732-1459-3-git-send-email-ray.huang@amd.com
Link: http://lkml.kernel.org/r/1439201994-28067-4-git-send-email-bp@alien8.de
Signed-off-by: Ingo Molnar <mingo@kernel.org>
2015-08-22 14:52:16 +02:00
..
crypto x86/fpu: Rename i387.h to fpu/api.h 2015-05-19 15:47:30 +02:00
fpu x86/fpu, sched: Dynamically allocate 'struct fpu' 2015-07-18 03:42:35 +02:00
numachip
trace Merge branch 'x86-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2015-06-22 17:59:09 -07:00
uv x86: UV BAU: Increase maximum CPUs per socket/hub 2014-11-03 13:49:24 +01:00
xen xen: Add __GFP_DMA flag when xen_swiotlb_init gets free pages on ARM 2015-05-06 15:02:58 +01:00
a.out-core.h
acenv.h
acpi.h x86/xen: Override ACPI IRQ management callback __acpi_unregister_gsi 2015-01-20 11:44:41 +01:00
agp.h
alternative-asm.h x86/alternatives: Document macros 2015-05-06 11:25:31 +02:00
alternative.h x86/alternatives, x86/fpu: Add 'alternatives_patched' debug flag and use it in xsave_state() 2015-05-19 15:48:03 +02:00
amd_nb.h x86/gart: Check for GART support before accessing GART registers 2015-05-06 11:15:53 +02:00
apb_timer.h
apic_flat_64.h
apic.h x86: Consolidate irq entering inlines 2015-05-15 16:04:49 +02:00
apicdef.h
apm.h
arch_hweight.h
archrandom.h
asm-offsets.h
asm.h x86/asm/uaccess: Unify the ALIGN_DESTINATION macro 2015-05-14 07:25:34 +02:00
atomic64_32.h
atomic64_64.h x86/asm: Always inline atomics 2015-04-22 08:14:41 +02:00
atomic.h x86: Force inlining of atomic ops 2015-05-08 12:55:50 +02:00
barrier.h x86/asm/tsc: Remove rdtsc_barrier() 2015-07-06 15:23:30 +02:00
bios_ebda.h
bitops.h
boot.h
bootparam_utils.h
bug.h
bugs.h
cache.h
cacheflush.h The libnvdimm sub-system introduces, in addition to the libnvdimm-core, 2015-06-29 10:34:42 -07:00
calgary.h
ce4100.h
checksum_32.h
checksum_64.h
checksum.h
clocksource.h
cmdline.h
cmpxchg_32.h
cmpxchg_64.h
cmpxchg.h arch: Remove __ARCH_HAVE_CMPXCHG 2015-05-13 10:55:42 +02:00
compat.h x86/asm/entry/64: Save user RSP in pt_regs->sp on SYSCALL64 fastpath 2015-03-10 13:56:10 +01:00
cpu_device_id.h
cpu.h x86: Use common outgoing-CPU-notification code 2015-03-11 13:22:35 -07:00
cpufeature.h x86/asm: Add MONITORX/MWAITX instruction support 2015-08-22 14:52:16 +02:00
cpumask.h
crash.h
current.h
debugreg.h perf/x86/amd: AMD support for bp_len > HW_BREAKPOINT_LEN_8 2014-12-03 15:14:26 +01:00
delay.h x86/asm/delay: Introduce an MWAITX-based delay with a configurable timer 2015-08-22 14:52:16 +02:00
desc_defs.h
desc.h x86/ldt: Make modify_ldt synchronous 2015-07-31 10:23:23 +02:00
device.h
disabled-features.h x86, mpx: Add MPX to disabled features 2014-11-18 00:58:53 +01:00
div64.h
dma-mapping.h x86: Deinline dma_free_attrs() 2015-05-05 20:48:02 +02:00
dma.h x86/mm: Fix zone ranges boot printout 2014-12-11 11:35:02 +01:00
dmi.h
e820.h mm: move memtest under mm 2015-04-14 16:49:06 -07:00
edac.h EDAC: Cleanup atomic_scrub mess 2015-05-28 15:31:53 +02:00
efi.h x86/fpu: Rename i387.h to fpu/api.h 2015-05-19 15:47:30 +02:00
elf.h x86/compat: Don't build the 32-bit VDSO if not needed 2015-07-06 15:28:56 +02:00
emergency-restart.h
entry_arch.h Merge branch 'x86/ras' into x86/core, to fix conflicts 2015-06-07 15:35:27 +02:00
espfix.h x86/espfix: Add 'cpu' parameter to init_espfix_ap() 2015-07-06 15:00:33 +02:00
exec.h
fb.h x86: Use new cache mode type in include/asm/fb.h 2014-11-16 11:04:24 +01:00
fixmap.h Merge branch 'x86-vdso-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2014-12-10 14:24:20 -08:00
floppy.h
frame.h x86/debug: Remove perpetually broken, unmaintainable dwarf annotations 2015-06-02 07:57:48 +02:00
ftrace.h ftrace/x86: Move MCOUNT_SAVE_FRAME out of header file 2014-12-01 14:07:16 -05:00
futex.h
gart.h
genapic.h
geode.h
gpio.h
hardirq.h Merge branch 'x86/ras' into x86/core, to fix conflicts 2015-06-07 15:35:27 +02:00
highmem.h x86: mm: Re-use the early_ioremap fixed area 2014-11-03 13:40:44 +01:00
hpet.h x86/MSI: Clean up unused MSI related code and interfaces 2015-04-24 15:36:49 +02:00
hugetlb.h mm/hugetlb: remove arch_prepare/release_hugepage from arch headers 2015-06-25 17:00:35 -07:00
hw_breakpoint.h perf/x86/amd: AMD support for bp_len > HW_BREAKPOINT_LEN_8 2014-12-03 15:14:26 +01:00
hw_irq.h Merge branch 'x86/ras' into x86/core, to fix conflicts 2015-06-07 15:35:27 +02:00
hypertransport.h
hypervisor.h hypervisor/x86/xen: Unset X86_BUG_SYSRET_SS_ATTRS on Xen PV guests 2015-05-05 18:27:43 +01:00
i8259.h
ia32_unistd.h
ia32.h x86/compat: Move ucontext_x32 to sigframe.h 2015-07-06 15:28:55 +02:00
idle.h
imr.h x86/intel/quark: Add Isolated Memory Regions for Quark X1000 2015-02-18 23:22:47 +01:00
inat_types.h
inat.h
init.h
insn.h x86/asm/decoder: Fix and enforce max instruction size in the insn decoder 2015-02-19 00:01:24 +01:00
inst.h
intel_mid_vrtc.h
intel_pmc_ipc.h intel_pmc_ipc: Update kerneldoc formatting 2015-07-09 11:23:15 -07:00
intel_scu_ipc.h
intel-mid.h x86, intel-mid: remove Intel MID specific serial support 2015-03-07 03:25:18 +01:00
io_apic.h x86: Cleanup irq_domain ops 2015-04-24 15:36:55 +02:00
io.h The libnvdimm sub-system introduces, in addition to the libnvdimm-core, 2015-06-29 10:34:42 -07:00
iomap.h
iommu_table.h x86/iommu: Fix header comments regarding standard and _FINISH macros 2015-04-09 10:56:31 +02:00
iommu.h
iosf_mbi.h
ipi.h
irq_regs.h
irq_remapping.h iommu, x86: Provide irq_remapping_cap() interface 2015-06-12 11:33:52 +02:00
irq_vectors.h x86/vm86: Move the vm86 IRQ definitions to vm86.h 2015-07-31 13:31:10 +02:00
irq_work.h
irq.h x86/irq: Define a global vector for VT-d Posted-Interrupts 2015-05-19 15:51:17 +02:00
irqdomain.h x86/irq: Move irqdomain specific code into asm/irqdomain.h 2015-04-24 15:36:55 +02:00
irqflags.h x86/asm/entry: Drop now unused ENABLE_INTERRUPTS_SYSEXIT32 2015-04-03 10:34:19 +02:00
ist.h
jump_label.h jump_label: Allow asm/jump_label.h to be included in assembly 2015-04-09 09:40:23 +02:00
kasan.h x86/kasan: Fix KASAN shadow region page tables 2015-07-06 14:53:13 +02:00
kbdleds.h
Kbuild mm: clean up per architecture MM hook header files 2015-07-17 16:39:53 -07:00
kdebug.h
kexec-bzimage64.h
kexec.h
kgdb.h
kmap_types.h
kmemcheck.h
kprobes.h
kvm_emulate.h KVM: x86: stubs for SMM support 2015-06-04 16:01:45 +02:00
kvm_guest.h
kvm_host.h KVM: count number of assigned devices 2015-07-10 13:25:26 +02:00
kvm_para.h x86: Use bool function return values of true/false not 1/0 2015-03-31 18:05:09 +02:00
lguest_hcall.h lguest: remove NOTIFY call and eventfd facility. 2015-02-11 16:47:46 +10:30
lguest.h lguest: suppress interrupts for single insn, not range. 2015-03-24 11:52:08 +10:30
linkage.h
livepatch.h livepatch: x86: make kASLR logic more accurate 2015-04-29 16:51:33 +02:00
local64.h
local.h
mach_timer.h
mach_traps.h
math_emu.h x86/vm86: Clean up vm86.h includes 2015-07-31 13:31:10 +02:00
mc146818rtc.h
mce.h x86/mce: Add infrastructure to support Local MCE 2015-06-07 15:33:14 +02:00
microcode_amd.h x86/microcode: Correct CPU family related variable types 2015-06-07 15:38:15 +02:00
microcode_intel.h x86/microcode/intel: Rename get_matching_sig() 2015-05-18 09:32:37 +02:00
microcode.h x86/microcode: Parse built-in microcode early 2015-05-06 11:24:53 +02:00
misc.h
mmconfig.h
mmu_context.h x86/ldt: Make modify_ldt() optional 2015-07-31 13:30:45 +02:00
mmu.h x86/ldt: Make modify_ldt() optional 2015-07-31 13:30:45 +02:00
mmx.h
mmzone_32.h
mmzone_64.h
mmzone.h
module.h
mpspec_def.h
mpspec.h
mpx.h x86/mpx: Support 32-bit binaries on 64-bit kernels 2015-06-09 12:24:34 +02:00
mshyperv.h
msi.h x86/MSI: Use hierarchical irqdomains to manage MSI interrupts 2015-04-24 15:36:49 +02:00
msidef.h
msr-index.h x86/uapi: Do not export <asm/msr-index.h> as part of the user API headers 2015-06-07 15:36:04 +02:00
msr.h x86/asm/tsc: Add rdtscll() merge helper 2015-08-21 08:35:42 +02:00
mtrr.h x86/mm/mtrr: Avoid #ifdeffery with phys_wc_to_mtrr_index() 2015-05-27 14:41:00 +02:00
mutex_32.h
mutex_64.h
mutex.h
mwait.h x86/asm: Add MONITORX/MWAITX instruction support 2015-08-22 14:52:16 +02:00
nmi.h
nops.h
numa_32.h
numa.h
olpc_ofw.h
olpc.h
page_32_types.h x86_64, traps: Stop using IST for #SS 2014-11-23 13:56:19 -08:00
page_32.h
page_64_types.h kasan: enable stack instrumentation 2015-02-13 21:21:41 -08:00
page_64.h x86_64,vsyscall: Make vsyscall emulation configurable 2014-11-03 21:44:57 +01:00
page_types.h x86, mm: support huge I/O mapping capability I/F 2015-04-14 16:49:04 -07:00
page.h
paravirt_types.h x86/asm/tsc, x86/paravirt: Remove read_tsc() and read_tscp() paravirt hooks 2015-07-06 15:23:26 +02:00
paravirt.h x86/asm/tsc, x86/paravirt: Remove read_tsc() and read_tscp() paravirt hooks 2015-07-06 15:23:26 +02:00
parport.h
pat.h x86/mm/pat: Emulate PAT when it is disabled 2015-06-07 15:28:52 +02:00
pci_64.h
pci_x86.h Revert "x86/PCI: Refine the way to release PCI IRQ resources" 2015-03-20 14:56:19 +01:00
pci-direct.h
pci-functions.h
pci.h Merge branch 'for-4.2/sg' of git://git.kernel.dk/linux-block 2015-06-25 15:22:36 -07:00
percpu.h x86-64: Use RIP-relative addressing for most per-CPU accesses 2014-11-04 20:43:14 +01:00
perf_event_p4.h
perf_event.h perf/x86/amd/ibs: Update IBS MSRs and feature definitions 2014-11-12 15:12:32 +01:00
pgalloc.h x86: expose number of page table levels on Kconfig level 2015-04-14 16:49:02 -07:00
pgtable_32_types.h x86: mm: Re-use the early_ioremap fixed area 2014-11-03 13:40:44 +01:00
pgtable_32.h
pgtable_64_types.h x86: expose number of page table levels on Kconfig level 2015-04-14 16:49:02 -07:00
pgtable_64.h mm: remove remaining references to NUMA hinting bits and helpers 2015-02-12 18:54:08 -08:00
pgtable_types.h x86/mm/pat: Add pgprot_writethrough() 2015-06-07 15:28:58 +02:00
pgtable-2level_types.h x86: expose number of page table levels on Kconfig level 2015-04-14 16:49:02 -07:00
pgtable-2level.h x86: drop _PAGE_FILE and pte_file()-related helpers 2015-02-10 14:30:33 -08:00
pgtable-3level_types.h x86: expose number of page table levels on Kconfig level 2015-04-14 16:49:02 -07:00
pgtable-3level.h x86: drop _PAGE_FILE and pte_file()-related helpers 2015-02-10 14:30:33 -08:00
pgtable.h mm: clarify that the function operates on hugepage pte 2015-06-24 17:49:44 -07:00
platform_sst_audio.h ASoC: Intel: mrfld: Define sst_res_info for acpi 2014-10-27 18:02:38 +00:00
pm-trace.h PM / sleep: add pm-trace support for suspending phase 2015-03-18 15:54:27 +01:00
pmc_atom.h x86: pmc_atom: Expose contents of PSS 2015-01-20 12:50:14 +01:00
posix_types.h
preempt.h preempt: Use preempt_schedule_context() as the official tracing preemption point 2015-06-07 15:57:42 +02:00
probe_roms.h
processor-cyrix.h
processor-flags.h
processor.h x86/vm86: Move vm86 fields out of 'thread_struct' 2015-07-31 13:31:07 +02:00
prom.h
proto.h x86/asm/entry: Untangle 'system_call' into two entry points: entry_SYSCALL_64 and entry_INT80_32 2015-06-08 09:14:21 +02:00
ptrace.h x86/entry: Remove do_notify_resume(), syscall_trace_leave(), and their TIF masks 2015-08-05 10:54:35 +02:00
pvclock-abi.h x86: kvmclock: add flag to indicate pvclock counts from zero 2015-05-29 14:01:39 +02:00
pvclock.h x86/asm/tsc, x86/kvm: Drop open-coded barrier and use rdtsc_ordered() in kvmclock 2015-07-06 15:23:30 +02:00
qrwlock.h
qspinlock_paravirt.h locking/pvqspinlock, x86: Implement the paravirt qspinlock call patching 2015-05-08 12:37:09 +02:00
qspinlock.h locking/pvqspinlock, x86: Implement the paravirt qspinlock call patching 2015-05-08 12:37:09 +02:00
realmode.h
reboot_fixups.h
reboot.h
required-features.h
rio.h
rmwcc.h
rtc.h
rwsem.h
seccomp.h x86: switch to using asm-generic for seccomp.h 2015-04-17 09:04:10 -04:00
sections.h
segment.h x86/asm/irq: Stop relying on magic JMP behavior for early_idt_handlers 2015-06-02 09:39:40 +02:00
serial.h serial: 8250: remove Kconfig indirection 2015-05-06 22:27:00 +02:00
setup_arch.h
setup.h x86: kaslr: fix build due to missing ALIGN definition 2015-04-29 21:54:54 +02:00
shmparam.h
sigcontext.h Revert x86 sigcontext cleanups 2015-08-13 12:42:22 -07:00
sigframe.h x86/compat: Move ucontext_x32 to sigframe.h 2015-07-06 15:28:55 +02:00
sighandling.h x86/signal: Remove pax argument from restore_sigcontext 2015-04-06 09:06:39 +02:00
signal.h x86/entry: Remove do_notify_resume(), syscall_trace_leave(), and their TIF masks 2015-08-05 10:54:35 +02:00
simd.h x86/fpu: Rename i387.h to fpu/api.h 2015-05-19 15:47:30 +02:00
smap.h x86/smap: Use ALTERNATIVE macro 2015-02-23 13:44:14 +01:00
smp.h x86: Remove cpu_sibling_mask() and cpu_core_mask() 2015-05-27 15:22:17 +02:00
sparsemem.h
special_insns.h x86/mm: Add kerneldoc comments for pcommit_sfence() 2015-05-11 10:38:44 +02:00
spinlock_types.h locking/pvqspinlock: Rename QUEUED_SPINLOCK to QUEUED_SPINLOCKS 2015-05-11 09:52:09 +02:00
spinlock.h locking/pvqspinlock: Rename QUEUED_SPINLOCK to QUEUED_SPINLOCKS 2015-05-11 09:52:09 +02:00
sta2x11.h
stackprotector.h x86/asm/tsc: Rename native_read_tsc() to rdtsc() 2015-07-06 15:23:28 +02:00
stacktrace.h
string_32.h
string_64.h x86_64: kasan: add interceptors for memset/memmove/memcpy functions 2015-02-13 21:21:41 -08:00
string.h
suspend_32.h x86/fpu: Rename i387.h to fpu/api.h 2015-05-19 15:47:30 +02:00
suspend_64.h x86/fpu: Rename i387.h to fpu/api.h 2015-05-19 15:47:30 +02:00
suspend.h
svm.h
swiotlb.h
switch_to.h Revert "sched/x86_64: Don't save flags on context switch" 2015-08-18 09:39:26 +02:00
sync_bitops.h
sys_ia32.h
syscall.h
syscalls.h x86/vm86: Clean up vm86.h includes 2015-07-31 13:31:10 +02:00
sysfb.h
tce.h
thread_info.h x86/entry: Remove do_notify_resume(), syscall_trace_leave(), and their TIF masks 2015-08-05 10:54:35 +02:00
time.h
timer.h
timex.h
tlb.h
tlbflush.h x86: Store a per-cpu shadow copy of CR4 2015-02-04 12:10:42 +01:00
topology.h Merge branch 'x86-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2015-06-22 17:59:09 -07:00
trace_clock.h
traps.h x86/entry: Remove exception_enter() from most trap handlers 2015-07-07 10:59:09 +02:00
tsc.h x86/asm/tsc: Rename native_read_tsc() to rdtsc() 2015-07-06 15:23:28 +02:00
uaccess_32.h Merge branch 'x86-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2015-06-22 17:59:09 -07:00
uaccess_64.h x86: clean up/fix 'copy_in_user()' tail zeroing 2015-04-08 14:28:45 -07:00
uaccess.h mm/uaccess, mm/fault: Clarify that uaccess may only sleep if pagefaults are enabled 2015-05-19 08:39:14 +02:00
unaligned.h
unistd.h
uprobes.h
user32.h
user_32.h
user_64.h
user.h x86/fpu: Rename xsave.header::xstate_bv to 'xfeatures' 2015-05-19 15:47:35 +02:00
vdso.h
vga.h
vgtod.h x86, vdso: Use asm volatile in __getcpu 2014-12-23 13:05:30 -08:00
virtext.h x86: Store a per-cpu shadow copy of CR4 2015-02-04 12:10:42 +01:00
vm86.h x86/vm86: Rename vm86->v86flags and v86mask 2015-07-31 13:31:11 +02:00
vmx.h KVM: VMX: Add PML support in VMX 2015-01-30 09:39:54 +01:00
vsyscall.h x86_64,vsyscall: Make vsyscall emulation configurable 2014-11-03 21:44:57 +01:00
vvar.h x86,vdso: Use LSL unconditionally for vgetcpu 2014-11-03 13:41:53 +01:00
word-at-a-time.h
x2apic.h
x86_init.h x86: Remove more unmodified io_apic_ops 2015-04-24 15:36:54 +02:00
xor_32.h x86/fpu: Rename i387.h to fpu/api.h 2015-05-19 15:47:30 +02:00
xor_64.h
xor_avx.h x86/fpu: Rename i387.h to fpu/api.h 2015-05-19 15:47:30 +02:00
xor.h x86/fpu: Rename i387.h to fpu/api.h 2015-05-19 15:47:30 +02:00