[Qemu-devel] [PATCH 0/5] s390x/kvm: avoid synchronize_rcu's in kernel

[Jens Freimann]

Whenever we call an ioctl from a wrong vcpu thread, the next ioctl will be
painfully slow because a synchronize_rcu thread has to be performed, therefore
involving all vcpu.

This patch series forces most ioctls to run on the associated vcpu.
It speeds up all start/restart/reset operations involving cpus drastically.


David Hildenbrand (5):
  kvm: run cpu state synchronization on target vcpu thread
  s390x/kvm: run guest triggered resets on the target vcpu thread
  s390x/kvm: execute sigp orders on the target vcpu thread
  s390x/kvm: execute "system reset" cpu resets on the vcpu thread
  s390x/kvm: execute the first cpu reset on the vcpu thread

 kvm-all.c                  | 18 ++++++++++++++++--
 target-s390x/cpu.c         |  6 +++++-
 target-s390x/cpu.h         | 15 +++++++++++++++
 target-s390x/kvm.c         | 23 ++++++++++++++++-------
 target-s390x/misc_helper.c | 30 ++++++++----------------------
 5 files changed, 60 insertions(+), 32 deletions(-)

-- 
1.9.3