RFR 8242263: Diagnose synchronization on primitive wrappers
Patricio Chilano
patricio.chilano.mateo at oracle.com
Fri Aug 7 15:29:14 UTC 2020
Hi Martin,
On 8/7/20 12:58 AM, Doerr, Martin wrote:
> Hi Patricio,
>
> thanks for the update.
>
> Sorry for causing trouble related to the tbnz instructions on aarch64.
> My concern was basically to use the correct number of Bytes for the load instructions.
> You have fixed that in webrev v3. Thanks.
>
> Unfortunately, I did the same mistake regarding the flag requirements on PPC64 and s390. And we have a wrong label on PPC64 (otherwise branch destination can be too far).
> Test duration is still terrible with the slow debug build. I still got timeouts. (Maybe I should better use fast debug builds.)
I measured the time in my Mac (fastdebug build). The FatalTest takes ~
less than a second to run, and we have 7*8=56 of those. The LogTest
takes between 1-4 seconds depending on the flag, and we have 7 of those.
Overall it takes 2-3 minutes to run. Maybe you can measure those times
too to see where its taking so long?
> Fixes see below.
Great, added the new fixes. Here is v4:
Full: http://cr.openjdk.java.net/~pchilanomate/8242263/v4/webrev/
Inc: http://cr.openjdk.java.net/~pchilanomate/8242263/v4/inc/webrev/
<http://cr.openjdk.java.net/~pchilanomate/8242263/v4/webrev/>
> Sometimes simple changes can require quite some time ...
Yep, no problem : )
Thanks!
Patricio
> Best regards,
> Martin
>
>
> diff -r f629202b3862 src/hotspot/cpu/ppc/c1_MacroAssembler_ppc.cpp
> --- a/src/hotspot/cpu/ppc/c1_MacroAssembler_ppc.cpp Thu Aug 06 22:03:39 2020 +0200
> +++ b/src/hotspot/cpu/ppc/c1_MacroAssembler_ppc.cpp Thu Aug 06 23:26:02 2020 +0200
> @@ -109,7 +109,7 @@
> load_klass(Rscratch, Roop);
> lwz(Rscratch, in_bytes(Klass::access_flags_offset()), Rscratch);
> testbitdi(CCR0, R0, Rscratch, exact_log2(JVM_ACC_IS_BOX_CLASS));
> - bne(CCR0, slow_case);
> + bne(CCR0, slow_int);
> }
>
> if (UseBiasedLocking) {
> diff -r f629202b3862 src/hotspot/cpu/ppc/macroAssembler_ppc.cpp
> --- a/src/hotspot/cpu/ppc/macroAssembler_ppc.cpp Thu Aug 06 22:03:39 2020 +0200
> +++ b/src/hotspot/cpu/ppc/macroAssembler_ppc.cpp Thu Aug 06 23:26:02 2020 +0200
> @@ -2839,8 +2839,8 @@
> if (DiagnoseSyncOnPrimitiveWrappers != 0) {
> load_klass(temp, oop);
> lwz(temp, in_bytes(Klass::access_flags_offset()), temp);
> - testbitdi(CCR0, R0, temp, exact_log2(JVM_ACC_IS_BOX_CLASS));
> - bne(CCR0, cont);
> + testbitdi(flag, R0, temp, exact_log2(JVM_ACC_IS_BOX_CLASS));
> + bne(flag, cont);
> }
>
> if (try_bias) {
> diff -r f629202b3862 src/hotspot/cpu/s390/macroAssembler_s390.cpp
> --- a/src/hotspot/cpu/s390/macroAssembler_s390.cpp Thu Aug 06 22:03:39 2020 +0200
> +++ b/src/hotspot/cpu/s390/macroAssembler_s390.cpp Thu Aug 06 23:26:02 2020 +0200
> @@ -3360,8 +3360,10 @@
>
> if (DiagnoseSyncOnPrimitiveWrappers != 0) {
> load_klass(Z_R1_scratch, oop);
> - testbit(Address(Z_R1_scratch, Klass::access_flags_offset()), exact_log2(JVM_ACC_IS_BOX_CLASS));
> - z_btrue(done);
> + z_l(Z_R1_scratch, Address(Z_R1_scratch, Klass::access_flags_offset()));
> + assert((JVM_ACC_IS_BOX_CLASS & 0xFFFF) == 0, "or change following instruction");
> + z_nilh(Z_R1_scratch, JVM_ACC_IS_BOX_CLASS >> 16);
> + z_brne(done);
> }
>
> if (try_bias) {
> diff -r f629202b3862 test/hotspot/jtreg/runtime/Monitor/SyncOnPrimitiveWrapperTest.java
> --- a/test/hotspot/jtreg/runtime/Monitor/SyncOnPrimitiveWrapperTest.java Thu Aug 06 22:03:39 2020 +0200
> +++ b/test/hotspot/jtreg/runtime/Monitor/SyncOnPrimitiveWrapperTest.java Thu Aug 06 23:26:02 2020 +0200
> @@ -31,7 +31,7 @@
> * @bug 8242263
> * @summary Exercise DiagnoseSyncOnPrimitiveWrappers diagnostic flag
> * @library /test/lib
> - * @run driver SyncOnPrimitiveWrapperTest
> + * @run driver/timeout=180000 SyncOnPrimitiveWrapperTest
> */
>
> public class SyncOnPrimitiveWrapperTest {
>
More information about the hotspot-runtime-dev
mailing list