[Qemu-devel] [RFC PATCH V2 0/3] Multithread TCG async_safe_work part.

[fred . konrad]

From: KONRAD Frederic <address@hidden>

This is the async_safe_work introduction bit of the Multithread TCG work.
Rebased on current upstream (6169b60285fe1ff730d840a49527e721bfb30899).

It can be cloned here:
http://git.greensocs.com/fkonrad/mttcg.git branch async_work_v2

The first patch introduces a mutex to protect the existing queued_work_*
CPUState members against multiple (concurent) access.

The second patch introduces a tcg_executing_flag which will be 1 when we are
inside cpu_exec(). This is required as safe work need to be sure that's all vCPU
are outside cpu_exec().

The last patch introduces async_safe_work. It allows to add some work which will
be done asynchronously but only when all vCPUs are outside cpu_exec(). The tcg
thread will wait that no vCPUs have any pending safe work before reentering
cpu-exec().

Changes V1 -> V2:
  * Release the lock while running the callback for both async and safe work.

KONRAD Frederic (3):
  cpus: protect queued_work_* with work_mutex.
  cpus: add a tcg_executing flag.
  cpus: introduce async_run_safe_work_on_cpu.

 cpu-exec.c        |   7 +++
 cpus.c            | 164 +++++++++++++++++++++++++++++++++++++++++-------------
 include/qom/cpu.h |  28 ++++++++++
 qom/cpu.c         |   2 +
 4 files changed, 161 insertions(+), 40 deletions(-)

-- 
1.9.0