[PATCH 1/2] [PING] Optimize generic spinlock code and use C11 like atomic macros.

[Stefan Liebler]

On 05/10/2017 03:00 PM, Stefan Liebler wrote:
> On 05/03/2017 01:38 PM, Stefan Liebler wrote:
>> On 04/25/2017 08:46 AM, Stefan Liebler wrote:
>>> On 04/18/2017 03:09 PM, Stefan Liebler wrote:
>>>> On 04/10/2017 01:59 PM, Stefan Liebler wrote:
>>>>> On 04/09/2017 03:51 PM, Torvald Riegel wrote:
>>>>>> On Fri, 2017-04-07 at 18:22 +0200, Stefan Liebler wrote:
>>>>>>> @architecture maintainers:
>>>>>>> I've added defines of ATOMIC_EXCHANGE_USES_CAS in the architecture
>>>>>>> specific atomic-machine.h files.
>>>>>>> See comment in include/atomic.h:
>>>>>>> /* ATOMIC_EXCHANGE_USES_CAS is equal to 1 if atomic_exchange
>>>>>>> operations
>>>>>>>     are implemented based on a CAS loop; otherwise, this is 0 and we
>>>>>>> assume
>>>>>>>     that the atomic_exchange operations could provide better
>>>>>>> performance
>>>>>>>     than a CAS loop.  */
>>>>>>>
>>>>>>> Can review the definition to 0 or 1 in the atomic-machine.h file of
>>>>>>> your
>>>>>>> architecture, please?
>>>>
>>>>
>>>> PING
>>>>
>>> PING
>>
>> PING
>
> PING
>
> @Torvald:
> I'm not sure if we will get answers from everybody.
> What do you propose how to proceed with the definitions of
> ATOMIC_EXCHANGE_USES_CAS?
>
PING

(This is the post with the patch defining ATOMIC_EXCHANGE_USES_CAS:
https://www.sourceware.org/ml/libc-alpha/2017-04/msg00135.html)
>>>>
>>>>>>
>>>>>> I think we primarily need feedback from the maintainers of the
>>>>>> architectures where we're not quite sure.  Let's see how responsive
>>>>>> everyone is and then decide whether we need to continue pinging
>>>>>> some of
>>>>>> them potentially or whether we have enough information to be able to
>>>>>> commit the patch.
>>>>>>
>>>>> Okay.
>>>>>
>>>>> Chris has already replied directly to me.
>>>>> On 04/07/2017 06:50 PM, Chris Metcalf wrote:
>>>>>> Thanks, looks good for tilegx/tilepro.
>>>>>
>>> Andreas has answered regarding the explicit check of
>>> ATOMIC_EXCHANGE_USES_CAS in include/atomic.h.
>>> @Andreas: is m68k okay?
>>>
>>> Joseph has replied for mips.
>>>
>>> What about the other architectures? Is the definition of
>>> ATOMIC_EXCHANGE_USES_CAS correct?
>>>
>>>>> Bye
>>>>> Stefan
>>>>>
>>>>
>>>
>>
>