[Qemu-devel] [PATCH 0/8] Make icount thread-safe

[Paolo Bonzini <pbonzini@redhat.com>]

This series moves the icount state under the same seqlock as the "normal"
vm_clock implementation.

It is not yet 100% thread-safe, because the CPU list should be moved
under RCU protection (due to the call to !all_cpu_threads_idle()
in qemu_clock_warp).  However it is a substantial step forward, the
only uncovered case being CPU hotplug.

Please review.

Paolo

Paolo Bonzini (8):
  timers: extract timer_mod_ns_locked and timerlist_rearm
  timers: add timer_mod_anticipate and timer_mod_anticipate_ns
  timers: use cpu_get_icount() directly
  timers: reorganize icount_warp_rt
  timers: prepare the code for future races in calling qemu_clock_warp
  timers: introduce cpu_get_clock_locked
  timers: document (future) locking rules for icount
  timers: make icount thread-safe

 cpus.c                 | 110 ++++++++++++++++++++++++++++++++++++-------------
 include/qemu/timer.h   |  26 +++++++++
 qemu-timer.c           |  74 +++++++++++++++++++------
 4 files changed, 163 insertions(+), 47 deletions(-)
 create mode 100644 include/qemu/seqlock.h

-- 
1.8.3.1