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7dd582305d
linux/arch/ia64/include/asm
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Frederic Weisbecker 7dd582305d sched/cputime, ia64: Accumulate cputime and account only on tick/task switch 
Currently CONFIG_VIRT_CPU_ACCOUNTING_NATIVE=y accounts the cputime on
any context boundary: irq entry/exit, guest entry/exit, context switch,
etc...

Calling functions such as account_system_time(), account_user_time()
and such can be costly, especially if they are called on many fastpath
such as twice per IRQ. Those functions do more than just accounting to
kcpustat and task cputime. Depending on the config, some subsystems can
perform unpleasant multiplications and divisions, among other things.

So lets accumulate the cputime instead and delay the accounting on ticks
and context switches only.

Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
Acked-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Christian Borntraeger <borntraeger@de.ibm.com>
Cc: Fenghua Yu <fenghua.yu@intel.com>
Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Rik van Riel <riel@redhat.com>
Cc: Stanislaw Gruszka <sgruszka@redhat.com>
Cc: Tony Luck <tony.luck@intel.com>
Cc: Wanpeng Li <wanpeng.li@hotmail.com>
Link: http://lkml.kernel.org/r/1483636310-6557-9-git-send-email-fweisbec@gmail.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
2017-01-14 09:54:12 +01:00
..
native ia64: remove paravirt code 2015-06-10 14:26:32 -07:00
sn ia64: Fix misspellings in comments. 2016-04-18 12:45:54 +02:00
uv ia64: Replace __get_cpu_var uses 2014-08-26 13:45:52 -04:00
acenv.h ACPICA: Linux: Add support to exclude <asm/acenv.h> inclusion. 2014-07-23 01:10:44 +02:00
acpi-ext.h
acpi.h ACPI / NUMA: Move acpi_numa_arch_fixup() to ia64 only 2016-05-30 14:27:07 +02:00
agp.h
asm-offsets.h
asmmacro.h
atomic.h ia64: implement atomic64_dec_if_positive 2016-10-07 18:46:30 -07:00
barrier.h ia64: define __smp_xxx 2016-01-12 20:46:55 +02:00
bitops.h arch,ia64: Convert smp_mb__*() 2014-04-18 14:20:35 +02:00
bug.h
bugs.h
cache.h
cacheflush.h
checksum.h ipv6: Pass proto to csum_ipv6_magic as __u8 instead of unsigned short 2016-03-13 23:55:13 -04:00
clocksource.h
cpu.h
cputime.h cputime: Generic on-demand virtual cputime accounting 2013-01-27 19:23:27 +01:00
current.h
cyclone.h
delay.h
device.h driver core / ACPI: Move ACPI support to core device and driver types 2012-11-15 00:28:00 +01:00
div64.h
dma-mapping.h dma-mapping: always provide the dma_map_ops based implementation 2016-01-20 17:09:18 -08:00
dma.h
dmi.h firmware/dmi_scan: generalize for use by other archs 2014-01-23 16:36:57 -08:00
early_ioremap.h ia64: split off early_ioremap() declarations into asm/early_ioremap.h 2016-01-13 10:35:14 -08:00
elf.h default SET_PERSONALITY() in linux/elf.h 2013-02-26 02:46:08 -05:00
emergency-restart.h
esi.h
export.h ia64: move exports to definitions 2016-08-07 23:55:50 -04:00
fb.h
fpswa.h
ftrace.h
futex.h Wrong asm register contraints in the futex implementation 2013-03-19 16:14:53 -07:00
gcc_intrin.h UAPI: (Scripted) Disintegrate arch/ia64/include/asm 2012-10-09 09:47:00 +01:00
hardirq.h
hpsim.h
hugetlb.h mm/hugetlb: remove arch_prepare/release_hugepage from arch headers 2015-06-25 17:00:35 -07:00
hw_irq.h ia64: remove paravirt code 2015-06-10 14:26:32 -07:00
idle.h
intrinsics.h ia64: remove paravirt code 2015-06-10 14:26:32 -07:00
io.h ia64: define ioremap_uc() 2016-03-17 15:09:34 -07:00
iommu_table.h
iommu.h x86/cpufeature: Remove cpu_has_x2apic 2016-03-31 13:35:08 +02:00
iosapic.h ia64: remove paravirt code 2015-06-10 14:26:32 -07:00
irq_regs.h
irq_remapping.h iommu/vt-d: Refine the interfaces to create IRQ for DMAR unit 2015-04-24 15:36:49 +02:00
irq.h genirq: Make create/destroy_irq() ia64 private 2014-05-16 14:05:21 +02:00
irqflags.h [IA64] Fix include dependency in asm/irqflags.h 2013-06-17 13:39:52 -07:00
Kbuild Merge branch 'strscpy' of git://git.kernel.org/pub/scm/linux/kernel/git/cmetcalf/linux-tile 2015-10-04 16:31:13 +01:00
kdebug.h
kexec.h
kmap_types.h
kprobes.h
kregs.h
libata-portmap.h libata: remove unused definitions from <asm/libata-portmap.h> 2016-09-22 11:50:19 -04:00
linkage.h consolidate cond_syscall and SYSCALL_ALIAS declarations 2013-03-03 22:55:19 -05:00
local64.h
local.h
machvec_dig_vtd.h [IA64] Rename platform_name to ia64_platform_name 2012-07-25 11:47:16 -07:00
machvec_dig.h [IA64] Rename platform_name to ia64_platform_name 2012-07-25 11:47:16 -07:00
machvec_hpsim.h [IA64] Rename platform_name to ia64_platform_name 2012-07-25 11:47:16 -07:00
machvec_hpzx1_swiotlb.h [IA64] Rename platform_name to ia64_platform_name 2012-07-25 11:47:16 -07:00
machvec_hpzx1.h [IA64] Rename platform_name to ia64_platform_name 2012-07-25 11:47:16 -07:00
machvec_init.h
machvec_sn2.h [IA64] Rename platform_name to ia64_platform_name 2012-07-25 11:47:16 -07:00
machvec_uv.h [IA64] Rename platform_name to ia64_platform_name 2012-07-25 11:47:16 -07:00
machvec.h dma-mapping: use unsigned long for dma_attrs 2016-08-04 08:50:07 -04:00
mca_asm.h
mca.h Fix initialization of CMCI/CMCP interrupts 2013-04-02 09:37:06 -07:00
meminit.h ia64/xen: Remove Xen support for ia64 2013-12-10 16:11:07 -08:00
mman.h UAPI: (Scripted) Disintegrate arch/ia64/include/asm 2012-10-09 09:47:00 +01:00
mmu_context.h
mmu.h
mmzone.h
module.h ia64: remove paravirt code 2015-06-10 14:26:32 -07:00
msidef.h
nodedata.h
numa.h ACPI/NUMA: Do not map pxm to node when NUMA is turned off 2016-12-15 11:32:32 +01:00
page.h libnvdimm, pfn, pmem: allocate memmap array in persistent memory 2016-01-15 17:56:32 -08:00
pal.h
param.h UAPI: (Scripted) Disintegrate arch/ia64/include/asm 2012-10-09 09:47:00 +01:00
parport.h IA64: drivers: remove __dev* attributes. 2013-01-03 15:57:13 -08:00
patch.h
pci.h PCI: Move pci_dma_* helpers to common code 2016-03-07 10:40:02 -06:00
percpu.h percpu: remove PERCPU_ENOUGH_ROOM which is stale definition 2015-11-16 10:50:25 -05:00
perfmon.h UAPI: (Scripted) Disintegrate arch/ia64/include/asm 2012-10-09 09:47:00 +01:00
pgalloc.h ia64: expose number of page table levels on Kconfig level 2015-04-14 16:49:02 -07:00
pgtable.h ia64: expose number of page table levels on Kconfig level 2015-04-14 16:49:02 -07:00
processor.h locking/core: Provide common cpu_relax_yield() definition 2016-11-17 08:17:36 +01:00
ptrace.h new helper: current_user_stack_pointer() 2012-12-19 18:07:39 -05:00
rwsem.h locking/rwsem: Remove rwsem_atomic_add() and rwsem_atomic_update() 2016-06-08 15:16:59 +02:00
sal.h
sections.h ia64: remove duplicate declarations of __per_cpu_start[] and __per_cpu_end[] 2014-10-14 02:18:28 +02:00
segment.h
serial.h
shmparam.h
siginfo.h UAPI: (Scripted) Disintegrate arch/ia64/include/asm 2012-10-09 09:47:00 +01:00
signal.h consolidate kernel-side struct sigaction declarations 2013-02-03 15:09:22 -05:00
smp.h IA64: drivers: remove __dev* attributes. 2013-01-03 15:57:13 -08:00
sparsemem.h
spinlock_types.h
spinlock.h locking/spinlock, arch: Update and fix spin_unlock_wait() implementations 2016-06-14 11:55:15 +02:00
string.h
swiotlb.h
switch_to.h ia64: Replace __get_cpu_var uses 2014-08-26 13:45:52 -04:00
syscall.h ARCH: AUDIT: implement syscall_get_arch for all arches 2014-09-23 16:20:10 -04:00
termios.h UAPI: (Scripted) Disintegrate arch/ia64/include/asm 2012-10-09 09:47:00 +01:00
thread_info.h sched/cputime, ia64: Accumulate cputime and account only on tick/task switch 2017-01-14 09:54:12 +01:00
timex.h
tlb.h mm: remove the page size change check in tlb_remove_page 2016-12-12 18:55:07 -08:00
tlbflush.h
topology.h sched/topology: Rename topology_thread_cpumask() to topology_sibling_cpumask() 2015-05-27 15:22:15 +02:00
types.h UAPI: (Scripted) Disintegrate arch/ia64/include/asm 2012-10-09 09:47:00 +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
uncached.h
unistd.h [IA64] Enable preadv2 and pwritev2 syscalls for ia64 2016-03-25 14:37:32 -07:00
unwind.h
user.h
ustack.h UAPI: (Scripted) Disintegrate arch/ia64/include/asm 2012-10-09 09:47:00 +01:00
vga.h
xor.h