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79ab11cdb9
linux_dsm_epyc7002/arch/s390/include/asm
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Christian Borntraeger 79ab11cdb9 locking/core: Introduce cpu_relax_yield() 
For spinning loops people do often use barrier() or cpu_relax().
For most architectures cpu_relax and barrier are the same, but on
some architectures cpu_relax can add some latency.
For example on power,sparc64 and arc, cpu_relax can shift the CPU
towards other hardware threads in an SMT environment.
On s390 cpu_relax does even more, it uses an hypercall to the
hypervisor to give up the timeslice.
In contrast to the SMT yielding this can result in larger latencies.
In some places this latency is unwanted, so another variant
"cpu_relax_lowlatency" was introduced. Before this is used in more
and more places, lets revert the logic and provide a cpu_relax_yield
that can be called in places where yielding is more important than
latency. By default this is the same as cpu_relax on all architectures.

Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
Cc: Nicholas Piggin <npiggin@gmail.com>
Cc: Noam Camus <noamc@ezchip.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Russell King <linux@armlinux.org.uk>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Will Deacon <will.deacon@arm.com>
Cc: linuxppc-dev@lists.ozlabs.org
Cc: virtualization@lists.linux-foundation.org
Cc: xen-devel@lists.xenproject.org
Link: http://lkml.kernel.org/r/1477386195-32736-2-git-send-email-borntraeger@de.ibm.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
2016-11-16 10:15:09 +01:00
..
fpu s390/fpu: improve kernel_fpu_[begin|end] 2016-08-29 11:05:01 +02:00
trace s390/diag: add a s390 prefix to the diagnose trace point 2015-11-09 09:10:47 +01:00
airq.h s390/airq: add support for irq ranges 2014-03-04 10:41:04 +01:00
appldata.h s390/diag: add a statistic for diagnose calls 2015-10-14 14:32:06 +02:00
asm-offsets.h
atomic.h locking/atomic: Remove linux/atomic.h:atomic_fetch_or() 2016-06-16 10:48:32 +02:00
barrier.h s390: more efficient smp barriers 2016-01-12 20:47:05 +02:00
bitops.h s390/bitops: remove 31 bit related comments 2015-10-14 14:32:15 +02:00
bug.h
bugs.h
cache.h s390: use __section macro everywhere 2016-06-13 15:58:23 +02:00
cacheflush.h mm/debug_pagealloc: fix build failure on ppc and some other archs 2015-02-05 13:35:30 -08:00
ccwdev.h s390/cio: fix multiple structure definitions 2014-05-20 08:58:53 +02:00
ccwgroup.h s390: fix new ccwgroup.h kernel-doc warning 2014-05-20 08:58:45 +02:00
checksum.h ipv4: Update parameters for csum_tcpudp_magic to their original types 2016-03-13 23:55:13 -04:00
chpid.h s390/cio: fix multiple structure definitions 2014-05-20 08:58:53 +02:00
cio.h s390/time: STP sync clock correction 2016-06-13 15:58:19 +02:00
clp.h s390/pci: add ioctl interface for CLP 2016-03-07 16:54:32 +01:00
cmb.h s390/cio: use device_lock during cmb activation 2015-10-14 14:32:02 +02:00
cmpxchg.h s390/cmpxchg: remove dead code 2015-10-14 14:32:15 +02:00
compat.h s390: remove is_32bit_task() helper 2015-11-27 09:24:17 +01:00
cpacf.h s390/crypto: cpacf function detection 2016-08-29 11:05:09 +02:00
cpcmd.h
cpu_mf.h s390/cpumf: use basic block for ecctr inline assembly 2016-06-28 09:32:38 +02:00
cpu.h s390/smp: cleanup core vs. cpu in the SCLP interface 2015-06-25 09:39:24 +02:00
cpufeature.h s390/module: enable generic CPU feature modalias using s390 ELF hwcaps 2015-07-22 09:58:02 +02:00
cputime.h s390: remove 31 bit support 2015-03-25 11:49:33 +01:00
crw.h s390/cio: Consolidate inline assemblies and related data definitions 2015-12-18 14:59:34 +01:00
css_chars.h s390/qdio: bridgeport support - CHSC part 2014-01-15 14:48:01 -08:00
ctl_reg.h s390/fpu: always enable the vector facility if it is available 2015-10-14 14:32:08 +02:00
current.h
debug.h s390/debug: avoid function call for debug_sprintf_* 2014-12-08 09:42:29 +01:00
delay.h
device.h s390/dma: Allow per device dma ops 2016-03-02 17:01:56 +02:00
diag.h - ARM: GICv3 ITS emulation and various fixes. Removal of the old 2016-08-02 16:11:27 -04:00
dis.h s390/disassembler: add vector instructions 2014-10-09 09:14:15 +02:00
div64.h
dma-mapping.h dma-mapping: use unsigned long for dma_attrs 2016-08-04 08:50:07 -04:00
dma.h
eadm.h s390/scm_block: do not hide eadm subchannel dependency 2013-11-15 14:08:42 +01:00
ebcdic.h
elf.h s390: Define AT_VECTOR_SIZE_ARCH for ARCH_DLINFO 2016-07-31 09:28:09 -04:00
emergency-restart.h
exec.h
extmem.h
facilities_src.h KVM: s390: generate facility mask from readable list 2016-08-25 22:47:03 +02:00
facility.h s390/facilities: optimize test_facility() 2015-12-18 14:59:23 +01:00
fb.h
fcx.h s390: use canonical include guard style 2016-06-13 15:58:17 +02:00
ftrace.h s390/dumpstack: get rid of return_address again 2016-10-17 14:44:33 +02:00
futex.h s390/uaccess: simplify control register updates 2014-05-20 08:58:46 +02:00
gmap.h KVM: s390: backup the currently enabled gmap when scheduled out 2016-06-20 09:55:24 +02:00
hardirq.h hardirq: Make hardirq bits generic 2013-11-13 20:21:46 +01:00
hugetlb.h s390/mm: add support for 2GB hugepages 2016-07-06 08:46:43 +02:00
hw_irq.h
idals.h s390: remove 31 bit support 2015-03-25 11:49:33 +01:00
idle.h s390/udelay: make udelay have busy loop semantics 2015-10-14 14:32:13 +02:00
io.h s390/io: Add pci_iomap_wc() and pci_iomap_wc_range() 2015-08-28 08:04:48 +02:00
ipl.h s390/ipl: rename diagnose enums 2016-06-13 15:58:26 +02:00
irq_regs.h
irq.h s390: use SPARSE_IRQ 2016-06-13 15:58:24 +02:00
irqflags.h s390/irqflags: optimize irq restore 2016-01-19 12:14:01 +01:00
isc.h
itcw.h
jump_label.h s390: add explicit <linux/stringify.h> for jump label 2016-06-13 15:58:16 +02:00
Kbuild s390: move exports to definitions 2016-08-07 23:47:20 -04:00
kdebug.h
kexec.h kexec: allocate the kexec control page with KEXEC_CONTROL_MEMORY_GFP 2015-04-23 16:52:01 +02:00
kmap_types.h
kprobes.h s390: stack address vs thread_info 2016-06-28 09:33:00 +02:00
kvm_host.h Merge branch 'kvm-ppc-next' of git://git.kernel.org/pub/scm/linux/kernel/git/paulus/powerpc into HEAD 2016-09-13 15:20:55 +02:00
kvm_para.h s390/diag: add a statistic for diagnose calls 2015-10-14 14:32:06 +02:00
linkage.h s390/kernel: move EX_TABLE macros to linkage.h header file 2015-07-22 09:57:59 +02:00
livepatch.h livepatch: reuse module loader code to write relocations 2016-04-01 15:00:11 +02:00
local64.h
local.h
lowcore.h s390/fpu: improve kernel_fpu_[begin|end] 2016-08-29 11:05:01 +02:00
mman.h s390: remove 31 bit support 2015-03-25 11:49:33 +01:00
mmu_context.h s390/mm,kvm: flush gmap address space with IDTE 2016-08-24 09:23:55 +02:00
mmu.h s390/mm,kvm: flush gmap address space with IDTE 2016-08-24 09:23:55 +02:00
mmzone.h s390/numa: add core infrastructure 2015-08-03 18:40:25 +02:00
module.h
nmi.h s390/nmi: remove casts 2015-10-27 09:33:55 +01:00
numa.h s390/numa: use correct type for node_to_cpumask_map 2015-09-23 09:18:56 +02:00
os_info.h s390/dump: streamline oldmem copy functions 2015-11-27 09:24:12 +01:00
page.h - ARM: GICv3 ITS emulation and various fixes. Removal of the old 2016-08-02 16:11:27 -04:00
pci_clp.h s390/pci: add ioctl interface for CLP 2016-03-07 16:54:32 +01:00
pci_debug.h s390/pci: remove CONFIG_PCI_DEBUG dependancy 2013-10-24 17:17:16 +02:00
pci_dma.h s390/pci_dma: fix DMA table corruption with > 4 TB main memory 2015-11-27 09:24:15 +01:00
pci_insn.h s390/pci: cleanup function information block 2013-10-24 17:17:17 +02:00
pci_io.h s390/pci: improve ZPCI_* macros 2016-01-26 12:45:49 +01:00
pci.h s390/pci_dma: improve lazy flush for unmap 2016-09-22 13:42:33 +02:00
percpu.h s390/percpu: remove this_cpu_cmpxchg_double_4 2016-03-02 06:44:30 -06:00
perf_event.h s390/perf: remove perf_release/reserver_sampling functions 2016-06-28 09:32:25 +02:00
pgalloc.h s390/mm: add shadow gmap support 2016-06-20 09:54:04 +02:00
pgtable.h s390/mm: merge local / non-local IDTE helper 2016-08-24 09:23:56 +02:00
processor.h locking/core: Introduce cpu_relax_yield() 2016-11-16 10:15:09 +01:00
ptrace.h s390: remove all usages of PSW_ADDR_INSN 2016-01-19 12:14:03 +01:00
qdio.h s390: remove 31 bit support 2015-03-25 11:49:33 +01:00
reset.h s390/dump: rework CPU register dump code 2015-11-27 09:24:14 +01:00
runtime_instr.h s390: remove 31 bit support 2015-03-25 11:49:33 +01:00
rwsem.h locking/rwsem: Remove rwsem_atomic_add() and rwsem_atomic_update() 2016-06-08 15:16:59 +02:00
schid.h
sclp.h s390/sclp: detect storage-key facility 2016-06-10 12:07:30 +02:00
scsw.h
seccomp.h s390/seccomp: include generic seccomp header file 2016-04-01 17:20:55 +02:00
sections.h s390: add proper __ro_after_init support 2016-06-13 15:58:23 +02:00
segment.h
serial.h
setup.h s390/console: Make preferred console handling more consistent 2016-07-13 10:58:07 +02:00
shmparam.h
signal.h
sigp.h s390/smp: use basic blocks for sigp inline assemblies 2016-06-28 09:32:35 +02:00
smp.h s390/dump: rework CPU register dump code 2015-11-27 09:24:14 +01:00
sparsemem.h s390: remove 31 bit support 2015-03-25 11:49:33 +01:00
spinlock_types.h s390/rwlock: use directed yield for write-locked rwlocks 2014-09-25 10:52:05 +02:00
spinlock.h locking/spinlock, arch: Update and fix spin_unlock_wait() implementations 2016-06-14 11:55:15 +02:00
stp.h s390/time: remove ETR support 2016-06-13 15:58:21 +02:00
string.h lib/string.c: remove strnicmp() 2015-02-12 18:54:14 -08:00
switch_to.h s390/fpu: split fpu-internal.h into fpu internals, api, and type headers 2015-10-16 09:41:12 +02:00
syscall.h s390/syscalls: simplify syscall_get_arch() 2015-03-30 13:26:07 +02:00
sysinfo.h s390/sysinfo: add missing SYSIB 1.2.2 multithreading fields 2016-01-11 12:27:00 +01:00
termios.h
thread_info.h s390: add missing declarations 2016-05-10 13:24:51 +02:00
timex.h s390/time: add leap seconds to initial system time 2016-06-13 15:58:20 +02:00
tlb.h mm/mmu_gather: track page size with mmu gather and force flush if page size change 2016-07-26 16:19:19 -07:00
tlbflush.h s390/mm,kvm: flush gmap address space with IDTE 2016-08-24 09:23:55 +02:00
topology.h s390/topology: add drawer scheduling domain level 2016-06-13 15:58:27 +02:00
types.h s390: remove 31 bit support 2015-03-25 11:49:33 +01:00
uaccess.h Merge branch 'uaccess-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2016-09-14 09:35:05 -07:00
unaligned.h
unistd.h s390: ignore pkey system calls 2016-10-17 11:25:25 +02:00
uprobes.h uprobes: remove function declarations from arch/{mips,s390} 2016-10-07 18:46:30 -07:00
user.h
vdso.h s390/vdso: optimize getcpu system call 2016-01-11 13:01:24 +01:00
vga.h
vtime.h
vtimer.h s390/idle: consolidate idle functions and definitions 2014-10-09 09:14:03 +02:00
vx-insn.h RAID/s390: add SIMD implementation for raid6 gen/xor 2016-08-29 11:05:04 +02:00
xor.h s390/xor: optimized xor routing using the XC instruction 2016-02-23 08:56:17 +01:00