RFR: 8220049: Remove -XX:-ThreadLocalHandshakes

[Per Liden]

Hi Robbin,

Not a complete review, but the ZGC change looks good. Just one minor 
nit, the added include in zMark.cpp looks incorrectly sorted.

@@ -44,10 +44,11 @@
  #include "oops/oop.inline.hpp"
  #include "runtime/atomic.hpp"
  #include "runtime/handshake.hpp"
  #include "runtime/prefetch.inline.hpp"
  #include "runtime/thread.hpp"
+#include "runtime/safepointMechanism.hpp"
  #include "utilities/align.hpp"
  #include "utilities/globalDefinitions.hpp"
  #include "utilities/ticks.hpp"

cheers,
/Per

On 12/10/19 10:43 AM, Robbin Ehn wrote:
> Hi all, please review,
> 
> ThreadLocalHandshakes is obsolete in JDK 14 and this changeset removes 
> the flag.
> All platforms except arm32 uses local poll.
> (after https://bugs.openjdk.java.net/browse/JDK-8235410, Enable 
> handshakes on Linux x86 (32-bit)
> , which this patch goes on top of)
> When arm32 also have local poll we remove the global poll code.
> 
> Changeset:
> http://cr.openjdk.java.net/~rehn/8220049/v1/webrev/
> Issue:
> https://bugs.openjdk.java.net/browse/JDK-8220049
> 
> Passes t1-7, built arm32, aarch64, sparc-solaris, linux x86/x64, windows 
> x64, osx, linux s390x, linux ppc64le
> 
> (note that on x86 there is missníng include in 
> src/hotspot/cpu/x86/sharedRuntime_x86_32.cpp,
> --- a/src/hotspot/cpu/x86/sharedRuntime_x86_32.cpp      Tue Dec 10 
> 08:47:38 2019 +0100
> +++ b/src/hotspot/cpu/x86/sharedRuntime_x86_32.cpp      Tue Dec 10 
> 10:24:14 2019 +0100
> @@ -32,0 +33,1 @@
> +#include "gc/shared/barrierSetAssembler_x86.hpp"
> )
> 
> Martin please have a look on aix changes.
> 
> Thanks, Robbin