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

[Paolo Bonzini <pbonzini@redhat.com>]

On 10/07/2015 18:08, fred.konrad@greensocs.com wrote:
> From: KONRAD Frederic <fred.konrad@greensocs.com>
> 
> 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.

What tree do these patches apply to?

Paolo

> 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(-)
>