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Frederic Weisbecker abf917cd91 cputime: Generic on-demand virtual cputime accounting 
If we want to stop the tick further idle, we need to be
able to account the cputime without using the tick.

Virtual based cputime accounting solves that problem by
hooking into kernel/user boundaries.

However implementing CONFIG_VIRT_CPU_ACCOUNTING require
low level hooks and involves more overhead. But we already
have a generic context tracking subsystem that is required
for RCU needs by archs which plan to shut down the tick
outside idle.

This patch implements a generic virtual based cputime
accounting that relies on these generic kernel/user hooks.

There are some upsides of doing this:

- This requires no arch code to implement CONFIG_VIRT_CPU_ACCOUNTING
if context tracking is already built (already necessary for RCU in full
tickless mode).

- We can rely on the generic context tracking subsystem to dynamically
(de)activate the hooks, so that we can switch anytime between virtual
and tick based accounting. This way we don't have the overhead
of the virtual accounting when the tick is running periodically.

And one downside:

- There is probably more overhead than a native virtual based cputime
accounting. But this relies on hooks that are already set anyway.

Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Li Zhong <zhong@linux.vnet.ibm.com>
Cc: Namhyung Kim <namhyung.kim@lge.com>
Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Cc: Paul Gortmaker <paul.gortmaker@windriver.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
 		2013-01-27 19:23:27 +01:00
..
cpufreq [CPUFREQ] use dynamic debug instead of custom infrastructure 2011-05-04 11:50:57 -04:00
.gitignore [IA64] Cleanup generated file not ignored by .gitignore 2008-08-04 11:06:16 -07:00
Makefile iommu: Rename the DMAR and INTR_REMAP config options 2011-09-21 10:22:03 +02:00
Makefile.gate Rename .data.gate to .data..gate. 2010-03-03 11:25:59 +01:00
acpi-ext.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
acpi.c IA64: drivers: remove __dev* attributes. 2013-01-03 15:57:13 -08:00
asm-offsets.c cputime: Generic on-demand virtual cputime accounting 2013-01-27 19:23:27 +01:00
audit.c [IA64] Remove COMPAT_IA32 support 2010-02-08 10:42:17 -08:00
brl_emu.c Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
crash.c sysctl: Drop & in front of every proc_handler. 2009-11-18 08:37:40 -08:00
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
cyclone.c ia64: Replace clocksource.fsys_mmio with generic arch data 2011-07-14 17:57:09 -07:00
dma-mapping.c ia64: Add export.h to arch/ia64 specific files as required 2011-10-31 19:30:58 -04:00
efi.c /dev/mem: use phys_addr_t for physical addresses 2012-10-24 15:32:50 -07:00
efi_stub.S [IA64] make efi_stub.S fit in 80 cols 2006-06-21 14:35:28 -07:00
elfcore.c elf coredump: add extended numbering support 2010-03-06 11:26:46 -08:00
entry.S cputime: Generic on-demand virtual cputime accounting 2013-01-27 19:23:27 +01:00
entry.h Remove obsolete #include <linux/config.h> 2006-06-30 19:25:36 +02:00
err_inject.c cpu: convert 'cpu' and 'machinecheck' sysdev_class to a regular subsystem 2011-12-21 14:29:42 -08:00
esi.c tree-wide: fix assorted typos all over the place 2009-12-04 15:39:55 +01:00
esi_stub.S [IA64] esi-support 2006-06-21 11:19:22 -07:00
fsys.S cputime: Generic on-demand virtual cputime accounting 2013-01-27 19:23:27 +01:00
fsyscall_gtod_data.h ia64: vsyscall: Use seqcount instead of seqlock 2012-03-15 18:17:59 -07:00
ftrace.c ftrace, ia64: IA64 dynamic ftrace support 2009-01-14 12:11:31 +01:00
gate-data.S Rename .data.gate to .data..gate. 2010-03-03 11:25:59 +01:00
gate.S Disintegrate asm/system.h for IA64 2012-03-28 18:30:02 +01:00
gate.lds.S Disintegrate asm/system.h for IA64 2012-03-28 18:30:02 +01:00
head.S cputime: Generic on-demand virtual cputime accounting 2013-01-27 19:23:27 +01:00
ia64_ksyms.c treewide: Put a space between #include and FILE 2012-06-28 11:44:36 +02:00
init_task.c Rename .data.init_task to .data..init_task. 2010-03-03 11:25:58 +01:00
iosapic.c IA64: drivers: remove __dev* attributes. 2013-01-03 15:57:13 -08:00
irq.c ia64: Use generic show_interrupts() 2011-03-29 14:48:05 +02:00
irq_ia64.c random: remove rand_initialize_irq() 2012-07-19 10:38:32 -04:00
irq_lsapic.c ia64: Convert lsapic to new irq_chip functions 2011-03-29 14:48:02 +02:00
ivt.S cputime: Generic on-demand virtual cputime accounting 2013-01-27 19:23:27 +01:00
jprobes.S [IA64] Move include/asm-ia64 to arch/ia64/include/asm 2008-08-01 10:21:21 -07:00
kprobes.c kprobes: Disable booster when CONFIG_PREEMPT=y 2010-02-04 09:36:18 +01:00
machine_kexec.c [IA64] kexec: Move the dereference below the NULL test 2012-09-10 14:31:23 -07:00
machvec.c Disintegrate asm/system.h for IA64 2012-03-28 18:30:02 +01:00
mca.c Merge branch 'akpm' (Andrew's patch-bomb) 2012-03-28 17:19:28 -07:00
mca_asm.S percpu: make percpu symbols in ia64 unique 2009-10-29 22:34:14 +09:00
mca_drv.c userns: On ia64 deal with current_uid and current_gid being kuid and kgid 2012-09-21 03:13:29 -07:00
mca_drv.h [IA64] mca style cleanup 2008-02-04 15:42:06 -08:00
mca_drv_asm.S [IA64] mca style cleanup 2008-02-04 15:42:06 -08:00
minstate.h cputime: Generic on-demand virtual cputime accounting 2013-01-27 19:23:27 +01:00
module.c modules: make arch's use default loader hooks 2011-07-24 22:06:04 +09:30
msi_ia64.c arch/ia64: remove references to cpu_*_map 2012-03-28 17:14:36 -07:00
nr-irqs.c ia64/pv_ops/xen: define the nubmer of irqs which xen needs. 2008-10-17 10:06:59 -07:00
numa.c [IA64] Minimize per_cpu reservations. 2008-04-08 13:51:35 -07:00
pal.S [IA64] reformat pal.S to fit in 80 columns, fix typos 2006-10-17 14:54:19 -07:00
palinfo.c [IA64] Use static const char * const in palinfo.c 2010-09-23 14:22:05 -07:00
paravirt.c static keys: Introduce 'struct static_key', static_key_true()/false() and static_key_slow_[inc|dec]() 2012-02-24 10:05:59 +01:00
paravirt_inst.h ia64/pv_ops: paravirtualized instruction checker. 2008-10-17 10:12:54 -07:00
paravirt_patch.c ia64/pv_op/binarypatch: add helper functions to support binary patching for paravirt_ops. 2009-03-26 11:02:31 -07:00
paravirt_patchlist.c [IA64] Fix build error in paravirt_patchlist.c 2009-06-17 09:04:40 -07:00
paravirt_patchlist.h ia64/pv_ops: gate page paravirtualization. 2009-03-26 10:51:02 -07:00
paravirtentry.S Rename .data.read_mostly to .data..read_mostly. 2010-03-03 11:26:00 +01:00
patch.c Disintegrate asm/system.h for IA64 2012-03-28 18:30:02 +01:00
pci-dma.c iommu: Remove group_mf 2012-06-25 13:48:30 +02:00
pci-swiotlb.c X86 & IA64: adapt for dma_map_ops changes 2012-03-28 16:36:31 +02:00
perfmon.c mm: kill vma flag VM_RESERVED and mm->reserved_vm counter 2012-10-09 16:22:19 +09:00
perfmon_default_smpl.c Fix common misspellings 2011-03-31 11:26:23 -03:00
perfmon_generic.h Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
perfmon_itanium.h Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
perfmon_mckinley.h [IA64] spelling fixes: arch/ia64/ 2007-05-11 14:55:43 -07:00
perfmon_montecito.h [IA64] sparse cleanups 2006-12-07 10:48:19 -08:00
process.c flagday: don't pass regs to copy_thread() 2012-11-28 23:43:42 -05:00
ptrace.c Disintegrate asm/system.h for IA64 2012-03-28 18:30:02 +01:00
relocate_kernel.S percpu: make percpu symbols in ia64 unique 2009-10-29 22:34:14 +09:00
sal.c [IA64] Update check_sal_cache_flush to use platform_send_ipi() 2008-06-11 16:40:33 -07:00
salinfo.c Merge branch 'llseek' of git://git.kernel.org/pub/scm/linux/kernel/git/arnd/bkl 2010-10-22 10:52:56 -07:00
setup.c Merge branch 'akpm' (Andrew's patch-bomb) 2012-03-28 17:19:28 -07:00
sigframe.h [IA64] Add TIF_RESTORE_SIGMASK 2007-05-08 14:51:59 -07:00
signal.c Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/signal 2012-10-12 10:49:08 +09:00
smp.c Merge branch 'akpm' (Andrew's patch-bomb) 2012-03-28 17:19:28 -07:00
smpboot.c IA64: drivers: remove __dev* attributes. 2013-01-03 15:57:13 -08:00
stacktrace.c [IA64] Add CONFIG_STACKTRACE_SUPPORT 2010-09-23 13:52:07 -07:00
sys_ia64.c ia64, sparc64: convert wrappers around do_mremap() to sys_mremap() 2012-05-30 21:04:56 -04:00
time.c cputime: Generic on-demand virtual cputime accounting 2013-01-27 19:23:27 +01:00
topology.c [IA64] Resolve name space collision for cache_show() 2012-11-07 15:51:04 -08:00
traps.c Disintegrate asm/system.h for IA64 2012-03-28 18:30:02 +01:00
unaligned.c [IA64] use __ratelimit 2010-05-18 14:45:54 -07:00
uncached.c Disintegrate asm/system.h for IA64 2012-03-28 18:30:02 +01:00
unwind.c Disintegrate asm/system.h for IA64 2012-03-28 18:30:02 +01:00
unwind_decoder.c Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
unwind_i.h Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
vmlinux.lds.S Disintegrate asm/system.h for IA64 2012-03-28 18:30:02 +01:00