[PATCH v6 0/3] Sched, KVM: st: Add steal time support to full dynticks CPU time accounting

[Wanpeng Li]

Periodic/NOHZ idle which don't use vtime have logic account steal time,
however, vtime(depends on context tracking) which is just used in full 
dynticks doesn't account steal time, this patchset adds the steal time 
acccount support in vtime which will be used in full dynticks guest.

Patch 1 and patch 2 fix steal clock warp and prev steal time account 
during cpu hotplug bugs.
Patch 3 adds the steal time support to full dynticks CPU time accounting.

N.B. This version of patchset drops previous Acked-by and Reviewed-by since 
they are different from earlier version. :)

v5 -> v6:
 * improve commit message of patch 2/3, 3/3
 * fix account st twice 
v4 -> v5:
 * improve commit message of patch 1/3
 * revert commit e9532e69b8d1 
 * apply same logic to account_idle_time, so change get_vtime_delta instead
v3 -> v4:
 * fix grammar errors, thanks Ingo
 * cleanup fragile codes, thanks Ingo
v2 -> v3:
 * fix the root cause
 * convert steal time jiffies to cputime
v1 -> v2:
 * update patch subject, description and comments
 * deal with the case where steal time suddenly increases by a ludicrous amount
 * fix divide zero bug, thanks Rik

Wanpeng Li (3):
  KVM: fix steal clock warp during guest cpu hotplug
  sched/cputime: Fix prev steal time accouting during cpu hotplug
  sched/cputime: Add steal time support to full dynticks CPU time
    accounting

 arch/x86/kernel/kvm.c  |  2 --
 kernel/sched/core.c    |  1 -
 kernel/sched/cputime.c | 16 +++++++++-------
 kernel/sched/sched.h   | 13 -------------
 4 files changed, 9 insertions(+), 23 deletions(-)

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1.9.1