RFR(xs): 8229967: Enable thread local handshakes on zero

[Robbin Ehn]

Thanks!

/Robbin

On 2019-08-21 13:32, Severin Gehwolf wrote:
> Hi Robin,
> 
> On Wed, 2019-08-21 at 10:19 +0200, Robbin Ehn wrote:
>> Hi all, please consider.
>>
>> Zero can have handshakes enabled.
>> This prepares the vm for removing global safepoints.
>>
>> Built x64 and sanity tested. (should be platform independent)
> 
> Thanks for doing this. Zero bootcycles fine with this for me on x86_64.
> So +1 from me.
> 
>> x86 do not build for me due to workaround_expand_exec_shield_cs_limit.
> 
> I've never tried 32 bit Zero on x86. Not sure if this was ever working.
> 
> Thanks,
> Severin
> 
>> Thanks, Robbin
>>
>> diff -r 7c20dcb59a68 src/hotspot/cpu/zero/globalDefinitions_zero.hpp
>> --- a/src/hotspot/cpu/zero/globalDefinitions_zero.hpp	Mon Aug 19 13:43:51 2019 +0200
>> +++ b/src/hotspot/cpu/zero/globalDefinitions_zero.hpp	Wed Aug 21 10:02:44 2019 +0200
>> @@ -32,2 +32,4 @@
>>
>> +#define THREAD_LOCAL_POLL
>> +
>>    #include <ffi.h>
>> diff -r 7c20dcb59a68 src/hotspot/cpu/zero/globals_zero.hpp
>> --- a/src/hotspot/cpu/zero/globals_zero.hpp	Mon Aug 19 13:43:51 2019 +0200
>> +++ b/src/hotspot/cpu/zero/globals_zero.hpp	Wed Aug 21 10:02:44 2019 +0200
>> @@ -78,3 +78,3 @@
>>
>> -define_pd_global(bool, ThreadLocalHandshakes, false);
>> +define_pd_global(bool, ThreadLocalHandshakes, true);
>