On Thu, 30 Nov 2023 00:14:34 GMT, Patricio Chilano Mateo
wrote:
>> Serguei Spitsyn has updated the pull request incrementally with one
>> additional commit since the last revision:
>>
>> review: make new fields volatile, use Atomic for access/update
>
> src/hotspot/share/prims/jvmtiThreadSta
On Wed, 29 Nov 2023 06:38:51 GMT, Stefan Karlsson wrote:
>> In the rewrites made for:
>> [JDK-8318757](https://bugs.openjdk.org/browse/JDK-8318757) `VM_ThreadDump
>> asserts in interleaved ObjectMonitor::deflate_monitor calls`
>>
>> I removed the filtering of *owned ObjectMonitors with dead obj
> This is an update for a performance/scalability enhancement.
>
> The `JvmtiVTMSTransitionDisabler`sync protocol is on a performance critical
> path of the virtual threads mount state transitions (VTMS transitions). It
> has a noticeable performance overhead (about 10%) which contributes to the
On Thu, 30 Nov 2023 02:39:39 GMT, Jonathan Joo wrote:
>> This two-step update does seem unnecessary, IMO.
>
> I agree that in the case that multiple closures are not active at the same
> time, we wouldn't have to implement it in this way. However, isn't it
> possible to have multiple closures a
On Wed, 29 Nov 2023 17:27:30 GMT, Jaroslav Bachorik
wrote:
>> Jaroslav Bachorik has updated the pull request incrementally with one
>> additional commit since the last revision:
>>
>> Restrict cleanup to obsolete methods only
>
> Thanks everyone involved in reviewing this PR! You were awesom
On Wed, 29 Nov 2023 22:22:09 GMT, Serguei Spitsyn wrote:
> There is a check for virtual thread liveness which has to be good enough in
> general:
>
> ```
> 1617 static bool should_dump_vthread(oop vt) {
> 1618 return java_lang_VirtualThread::state(vt) !=
> java_lang_VirtualThread::NEW
>
Please review this simple clarification to the JVM TI spec regarding use of
`JAVA_TOOL_OPTIONS` in regards to module options and their format.
I do not believe this clarification needs a CSR request.
Thanks.
-
Commit messages:
- 8320860: add-opens/add-exports require '=' in JAVA_T
> 8315149: Add hsperf counters for CPU time of internal GC threads
Jonathan Joo has updated the pull request incrementally with one additional
commit since the last revision:
Add missing include
-
Changes:
- all: https://git.openjdk.org/jdk/pull/15082/files
- new: https://git
On Tue, 28 Nov 2023 23:25:27 GMT, Yi-Fan Tsai wrote:
>> `jcmd Compiler.perfmap` uses the hard-coded file name for a perf map:
>> `/tmp/perf-%d.map`. This change adds an optional argument for specifying a
>> file name.
>>
>> `jcmd PID help Compiler.perfmap` shows the following usage.
>>
>>
>>
On Wed, 29 Nov 2023 15:24:52 GMT, Albert Mingkun Yang wrote:
>> src/hotspot/share/runtime/cpuTimeCounters.cpp line 91:
>>
>>> 89: } while (old_value != fetched_value);
>>> 90: get_counter(CPUTimeGroups::CPUTimeType::gc_total)->inc(fetched_value);
>>> 91: }
>>
>> Why do we have to do this pu
> This is a fix of a performance/scalability related issue. The
> `JvmtiThreadState` objects for virtual thread filtered events enabled
> globally are created eagerly because it is needed when the `interp_only_mode`
> is enabled. Otherwise, some events which are generated in `interp_only_mode`
> 8315149: Add hsperf counters for CPU time of internal GC threads
Jonathan Joo has updated the pull request incrementally with one additional
commit since the last revision:
fix whitespace again
-
Changes:
- all: https://git.openjdk.org/jdk/pull/15082/files
- new: https://gi
> 8315149: Add hsperf counters for CPU time of internal GC threads
Jonathan Joo has updated the pull request with a new target base due to a merge
or a rebase. The pull request now contains 56 commits:
- Merge branch 'openjdk:master' into master
- remove whitespace
- Change APIs to be all-sta
> 8315149: Add hsperf counters for CPU time of internal GC threads
Jonathan Joo has updated the pull request incrementally with one additional
commit since the last revision:
remove whitespace
-
Changes:
- all: https://git.openjdk.org/jdk/pull/15082/files
- new: https://git.o
On Wed, 29 Nov 2023 15:23:55 GMT, Albert Mingkun Yang wrote:
>> We could add a new closure just used by GC that 's a sub-class of
>> `ThreadTotalCPUTimeClosure` and just adds this to the constructor:
>>
>> instance->inc_gc_total_cpu_time(net_cpu_time);
>>
>>
>> That way we could get rid of `
> 8315149: Add hsperf counters for CPU time of internal GC threads
Jonathan Joo has updated the pull request incrementally with one additional
commit since the last revision:
Change APIs to be all-static, address other comments
-
Changes:
- all: https://git.openjdk.org/jdk/pull
On Wed, 29 Nov 2023 21:05:31 GMT, Daniel D. Daugherty
wrote:
>> Serguei Spitsyn has updated the pull request incrementally with one
>> additional commit since the last revision:
>>
>> review: add comment for new ThreadsListHandle use
>
> I'm going to resurrect the failing guarantee() code an
On Thu, 30 Nov 2023 00:26:25 GMT, Alex Menkov wrote:
>> The change impelements dumping of unmounted virtual threads data (stack
>> traces and stack references).
>> Unmounted vthreads can be detected only by iterating over the heap, but
>> hprof stack trace records (HPROF_FRAME/HPROF_TRACE) shou
On Fri, 17 Nov 2023 10:30:59 GMT, Serguei Spitsyn wrote:
>> This is an update for a performance/scalability enhancement.
>>
>> The `JvmtiVTMSTransitionDisabler`sync protocol is on a performance critical
>> path of the virtual threads mount state transitions (VTMS transitions). It
>> has a noti
On Fri, 17 Nov 2023 10:30:59 GMT, Serguei Spitsyn wrote:
>> This is an update for a performance/scalability enhancement.
>>
>> The `JvmtiVTMSTransitionDisabler`sync protocol is on a performance critical
>> path of the virtual threads mount state transitions (VTMS transitions). It
>> has a noti
On Wed, 29 Nov 2023 22:16:53 GMT, Serguei Spitsyn wrote:
>> I think the easiest solution is probably just coming up with some reasonable
>> max sequence number and then just assuming that you will need enough chars
>> for it. But if you want to actually compute it, there are a few solutions,
>
On Wed, 29 Nov 2023 22:38:18 GMT, Serguei Spitsyn wrote:
>> Alex Menkov has updated the pull request incrementally with two additional
>> commits since the last revision:
>>
>> - feedback
>> - prepare_parallel_dum
>
> src/hotspot/share/services/heapDumper.cpp line 1947:
>
>> 1945: _comp
On Wed, 29 Nov 2023 20:14:07 GMT, Chris Plummer wrote:
>> Alex Menkov has updated the pull request incrementally with two additional
>> commits since the last revision:
>>
>> - feedback
>> - prepare_parallel_dum
>
> src/hotspot/share/services/heapDumper.cpp line 1886:
>
>> 1884: };
>> 1885:
> The change impelements dumping of unmounted virtual threads data (stack
> traces and stack references).
> Unmounted vthreads can be detected only by iterating over the heap, but hprof
> stack trace records (HPROF_FRAME/HPROF_TRACE) should be written before
> HPROF_HEAP_DUMP/HPROF_HEAP_DUMP_SEG
On Thu, 23 Nov 2023 12:43:00 GMT, Albert Mingkun Yang wrote:
>> Jonathan Joo has updated the pull request incrementally with one additional
>> commit since the last revision:
>>
>> Cleanup and address comments
>
> src/hotspot/share/gc/g1/g1CollectedHeap.cpp line 2433:
>
>> 2431: }
>> 2432:
On Fri, 17 Nov 2023 10:30:59 GMT, Serguei Spitsyn wrote:
>> This is an update for a performance/scalability enhancement.
>>
>> The `JvmtiVTMSTransitionDisabler`sync protocol is on a performance critical
>> path of the virtual threads mount state transitions (VTMS transitions). It
>> has a noti
On Wed, 22 Nov 2023 22:40:20 GMT, Jiangli Zhou wrote:
>> Please review JvmtiThreadState::state_for_while_locked change to handle the
>> state->get_thread_oop() null case. Please see
>> https://bugs.openjdk.org/browse/JDK-8319935 for details.
>
> Jiangli Zhou has updated the pull request increme
On Tue, 14 Nov 2023 21:54:06 GMT, Alex Menkov wrote:
> The change impelements dumping of unmounted virtual threads data (stack
> traces and stack references).
> Unmounted vthreads can be detected only by iterating over the heap, but hprof
> stack trace records (HPROF_FRAME/HPROF_TRACE) should b
On Tue, 14 Nov 2023 21:54:06 GMT, Alex Menkov wrote:
> The change impelements dumping of unmounted virtual threads data (stack
> traces and stack references).
> Unmounted vthreads can be detected only by iterating over the heap, but hprof
> stack trace records (HPROF_FRAME/HPROF_TRACE) should b
On Wed, 29 Nov 2023 20:51:02 GMT, Chris Plummer wrote:
>> The change impelements dumping of unmounted virtual threads data (stack
>> traces and stack references).
>> Unmounted vthreads can be detected only by iterating over the heap, but
>> hprof stack trace records (HPROF_FRAME/HPROF_TRACE) sh
On Wed, 29 Nov 2023 20:31:50 GMT, Chris Plummer wrote:
>> src/hotspot/share/services/heapDumper.cpp line 2026:
>>
>>> 2024: size_t buf_size = strlen(base_path)
>>> 2025: + 2 // ".p"
>>> 2026: + 1 + (seq / 10)// number
>>
>> Is this
On Tue, 28 Nov 2023 23:24:53 GMT, Ioi Lam wrote:
> This is a simple clean up that moves the code for initializing the CDS config
> states from arguments.cpp to cdsConfig.cpp
>
> I renamed a few functions, but otherwise the code is unchanged.
>
> - `get_default_shared_archive_path()` -> `defaul
On Fri, 17 Nov 2023 20:29:11 GMT, Serguei Spitsyn wrote:
>> This is a fix of a performance/scalability related issue. The
>> `JvmtiThreadState` objects for virtual thread filtered events enabled
>> globally are created eagerly because it is needed when the
>> `interp_only_mode` is enabled. Oth
On Wed, 29 Nov 2023 20:29:40 GMT, Chris Plummer wrote:
>> The change impelements dumping of unmounted virtual threads data (stack
>> traces and stack references).
>> Unmounted vthreads can be detected only by iterating over the heap, but
>> hprof stack trace records (HPROF_FRAME/HPROF_TRACE) sh
On Tue, 14 Nov 2023 21:54:06 GMT, Alex Menkov wrote:
> The change impelements dumping of unmounted virtual threads data (stack
> traces and stack references).
> Unmounted vthreads can be detected only by iterating over the heap, but hprof
> stack trace records (HPROF_FRAME/HPROF_TRACE) should b
On Tue, 24 Oct 2023 00:46:54 GMT, Alex Menkov wrote:
> FilteredFieldStream is intended to filter out some fields which does not
> represent valid java objects.
> Currently the only filtered field is "constantPoolOop" from
> jdk.internal.reflect.ConstantPool class.
> The change fixes FilteredFie
On Tue, 28 Nov 2023 22:40:10 GMT, Serguei Spitsyn wrote:
>> @jianglizhou Thank you for filing the sub-task. You have already seen some
>> crashes. Even though you do not have a standalone test case, it is still
>> valuable if you describe a test scenario (at least, surfacely) which helped
>> t
On Tue, 14 Nov 2023 17:56:09 GMT, Jaroslav Bachorik
wrote:
> Please, review this fix for a corner case handling of `jmethodID` values.
>
> The issue is related to the interplay between `jmethodID` values and method
> redefinitions. Each `jmethodID` value is effectively a pointer to a `Method`
On Wed, 29 Nov 2023 11:49:31 GMT, Jaroslav Bachorik
wrote:
>> Please, review this fix for a corner case handling of `jmethodID` values.
>>
>> The issue is related to the interplay between `jmethodID` values and method
>> redefinitions. Each `jmethodID` value is effectively a pointer to a `Meth
On Wed, 29 Nov 2023 15:14:59 GMT, Jaroslav Bachorik
wrote:
>> I am going to take a look.
>
> Ok, I found it.
> The reason for the jmethodID not being cleaned out is this assignment of a
> new jmethodID to obsolete methods -
> https://github.com/openjdk/jdk/blob/a2c5f1fc914ef5c28d044b75598f895c
On Tue, 28 Nov 2023 18:38:07 GMT, Daniel D. Daugherty
wrote:
>> Stefan Karlsson has updated the pull request incrementally with one
>> additional commit since the last revision:
>>
>> Fix indentation
>
> I'll re-review again once the last set of comments are addressed.
Thanks @dcubed-ojdk!
On Wed, 29 Nov 2023 06:38:51 GMT, Stefan Karlsson wrote:
>> In the rewrites made for:
>> [JDK-8318757](https://bugs.openjdk.org/browse/JDK-8318757) `VM_ThreadDump
>> asserts in interleaved ObjectMonitor::deflate_monitor calls`
>>
>> I removed the filtering of *owned ObjectMonitors with dead obj
On Mon, 13 Nov 2023 21:52:22 GMT, Jiangli Zhou wrote:
> Please review JvmtiThreadState::state_for_while_locked change to handle the
> state->get_thread_oop() null case. Please see
> https://bugs.openjdk.org/browse/JDK-8319935 for details.
This pull request has now been integrated.
Changeset:
On Tue, 28 Nov 2023 21:28:31 GMT, Jiangli Zhou wrote:
>> This fix looks good to me, so approved now.
>> I assume it is for 22. Is it correct?
>
>> This fix looks good to me, so approved now. I assume it is for 22. Is it
>> correct?
>
> Thanks for the careful review, @sspitsyn! The fix is for 22
On Thu, 16 Nov 2023 21:58:17 GMT, Man Cao wrote:
>> Jiangli Zhou has updated the pull request incrementally with one additional
>> commit since the last revision:
>>
>> Don't try to setup_jvmti_thread_state for obj allocation sampling if the
>> current thread is attaching from native and is
On Wed, 29 Nov 2023 08:31:37 GMT, Stefan Johansson wrote:
>> src/hotspot/share/runtime/cpuTimeCounters.cpp line 119:
>>
>>> 117: if (CPUTimeGroups::is_gc_counter(_name)) {
>>> 118: instance->inc_gc_total_cpu_time(net_cpu_time);
>>> 119: }
>>
>> I feel much of this is on the wrong
On Wed, 29 Nov 2023 08:24:22 GMT, Stefan Johansson wrote:
>> Jonathan Joo has updated the pull request incrementally with two additional
>> commits since the last revision:
>>
>> - Fix namespace issues (2)
>>
>>Co-authored-by: Stefan Johansson
>> <54407259+kstef...@users.noreply.githu
On Wed, 29 Nov 2023 14:57:34 GMT, Jaroslav Bachorik
wrote:
>> Can you confirm my observation above, that EMCP jmethodIDs are replaced? I
>> haven't looked at this code in a while. Thanks.
>
> I am going to take a look.
Ok, I found it.
The reason for the jmethodID not being cleaned out is thi
On Wed, 29 Nov 2023 13:29:18 GMT, Coleen Phillimore wrote:
>> Restricting to obsolete methods sounds like a good idea.
>
> Can you confirm my observation above, that EMCP jmethodIDs are replaced? I
> haven't looked at this code in a while. Thanks.
I am going to take a look.
-
PR
On Wed, 29 Nov 2023 11:45:53 GMT, Jaroslav Bachorik
wrote:
>> src/hotspot/share/oops/instanceKlass.cpp line 4236:
>>
>>> 4234: if (method != nullptr) {
>>> 4235: method->clear_jmethod_id();
>>> 4236: }
>>
>> This loops through the methods in the InstanceKlass that was a previous
On Tue, 28 Nov 2023 21:30:16 GMT, Coleen Phillimore wrote:
>> Jaroslav Bachorik has updated the pull request incrementally with one
>> additional commit since the last revision:
>>
>> Remove unnecessary assert
>
> src/hotspot/share/oops/instanceKlass.cpp line 4236:
>
>> 4234: if (method
> Please, review this fix for a corner case handling of `jmethodID` values.
>
> The issue is related to the interplay between `jmethodID` values and method
> redefinitions. Each `jmethodID` value is effectively a pointer to a `Method`
> instance. Once that method gets redefined, the `jmethodID`
On Wed, 29 Nov 2023 06:44:58 GMT, David Holmes wrote:
> JDWP filters its own internal threads out of any thread lists it returns, so
> this may be a case of using two different API's with different views of the
> set of threads running.
I think the issue that Bernd is running into is a long st
On Tue, 24 Oct 2023 09:56:57 GMT, Thomas Schatzl wrote:
> The JEP covers the idea very well, so I'm only covering some implementation
> details here:
>
> * regions get a "pin count" (reference count). As long as it is non-zero, we
> conservatively never reclaim that region even if there is no
On Fri, 3 Nov 2023 14:14:50 GMT, Albert Mingkun Yang wrote:
>> Thomas Schatzl has updated the pull request incrementally with one
>> additional commit since the last revision:
>>
>> typos
>
> Marked as reviewed by ayang (Reviewer).
Thanks @albertnetymk @kstefanj @walulyai for your reviews! G
On Mon, 27 Nov 2023 19:33:09 GMT, Serguei Spitsyn wrote:
> It will be completely safe to run mach5 tiers 1-4, tier5-svc and 6. In this
> particular case, the tier6 can be not necessary. It has some important
> -Xcomp/interp_only_mode related testing.
I've run the suggested testing and it passe
On Tue, 28 Nov 2023 02:22:45 GMT, Jonathan Joo wrote:
>> 8315149: Add hsperf counters for CPU time of internal GC threads
>
> Jonathan Joo has updated the pull request incrementally with two additional
> commits since the last revision:
>
> - Fix namespace issues (2)
>
>Co-authored-by:
On Thu, 23 Nov 2023 13:46:54 GMT, Albert Mingkun Yang wrote:
>> Jonathan Joo has updated the pull request incrementally with one additional
>> commit since the last revision:
>>
>> Cleanup and address comments
>
> src/hotspot/share/runtime/cpuTimeCounters.cpp line 119:
>
>> 117: if (CPUT
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