Re: [Qemu-devel] [RFC 00/10] MultiThread TCG.

[Frederic Konrad <fred.konrad@greensocs.com>]

Hi,

Yes a v2 will come soon.
Actually I'm trying to unbreak GDB stub and a strange segfault with smp > 2.

Fred

On 27/03/2015 11:08, Alex Bennée wrote:
> fred.konrad@greensocs.com writes:
>
>> From: KONRAD Frederic <fred.konrad@greensocs.com>
>>
>> Hi everybody,
>>
>> This is the start of our work on TCG multithread.
> It's been a while since the first RFC are we likely to see a v2 of the
> patch series any time soon?
>
>> We send it for comment to be sure we are taking the right direction.
>> We already discussed the first patch but we keep it for simplicity.
>>
>> We choice to keep a common tbs array for all VCPU but protect it with the
>> tb_lock from TBContext. Then for each PageDesc we have a tb list per VCPU.
>>
>> Known issues:
>>    * Some random deadlock.
>>    * qemu_pause_cond is broken we can't quit QEMU.
>>    * tb_flush is broken we must make sure no VCPU are executing code.
>>
>> Jan Kiszka (1):
>>    Drop global lock during TCG code execution
>>
>> KONRAD Frederic (9):
>>    target-arm: protect cpu_exclusive_*.
>>    use a different translation block list for each cpu.
>>    replace spinlock by QemuMutex.
>>    remove unused spinlock.
>>    extract TBContext from TCGContext.
>>    protect TBContext with tb_lock.
>>    tcg: remove tcg_halt_cond global variable.
>>    cpu: remove exit_request global.
>>    tcg: switch on multithread.
>>
>>   cpu-exec.c                |  47 +++++++----
>>   cpus.c                    | 122 +++++++++++----------------
>>   cputlb.c                  |   5 ++
>>   exec.c                    |  25 ++++++
>>   include/exec/exec-all.h   |   4 +-
>>   include/exec/spinlock.h   |  49 -----------
>>   include/qom/cpu.h         |   1 +
>>   linux-user/main.c         |   6 +-
>>   scripts/checkpatch.pl     |   9 +-
>>   softmmu_template.h        |   6 ++
>>   target-arm/cpu.c          |  14 ++++
>>   target-arm/cpu.h          |   3 +
>>   target-arm/helper.h       |   3 +
>>   target-arm/op_helper.c    |  10 +++
>>   target-arm/translate.c    |   6 ++
>>   target-i386/mem_helper.c  |  16 +++-
>>   target-i386/misc_helper.c |  27 +++++-
>>   tcg/i386/tcg-target.c     |   8 ++
>>   tcg/tcg.h                 |   3 +-
>>   translate-all.c           | 208 +++++++++++++++++++++++++++-------------------
>>   vl.c                      |   6 ++
>>   21 files changed, 335 insertions(+), 243 deletions(-)
>>   delete mode 100644 include/exec/spinlock.h