[PATCH 0/3] cputime: Moar cleanups / enhancements

[Frederic Weisbecker <fweisbec@gmail.com>]

Hi,

I think that the 1st and 3rd patches are pretty uncontroversial given
how vtime_account() confusingly tries to do everything for
CONFIG_VIRT_CPU_ACCOUNTING and CONFIG_IRQ_TIME_ACCOUNTING.

I believe the 2nd is also desired. vtime_account() is called
two times per irq, sometimes more if softirqs are involved. So
I think we want to optimize that by calling directly its specialized
APIs when possible.

There is still some work to do but I'm proceeding step by step.
I may focuse more on that generic vtime implementation next
time to implement cputime accounting for the tickmess patchset.
That, for sure, will inspire for even more cputime optimizations/cleanups.

Thanks.

PS: tested on x86 and ppc64 (checked reliability of times and /proc/stat).
But only built tested on s390 and ia64.

Frederic Weisbecker (3):
  kvm: Directly account vtime to system on guest switch
  cputime: Specialize irq vtime hooks
  cputime: Separate irqtime accounting from generic vtime

 arch/ia64/kernel/time.c     |    1 +
 arch/powerpc/kernel/time.c  |    1 +
 arch/s390/kernel/vtime.c    |    4 ++
 include/linux/hardirq.h     |   80 +++++++++++++++++++++++++++++++++++--------
 include/linux/kernel_stat.h |    8 ----
 include/linux/kvm_host.h    |   12 +++++-
 kernel/sched/cputime.c      |    8 ++--
 kernel/softirq.c            |    6 ++--
 8 files changed, 88 insertions(+), 32 deletions(-)

-- 
1.7.5.4