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Implement JVM_VirtualThread[Mount|Unmount|Start|End] #17125

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Implement JVM_VirtualThread[Mount|Unmount|Start|End] #17125

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thallium
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@thallium thallium commented Apr 6, 2023 •
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  • Move code of APIs of JDK 20 such as JVM_VirtualThreadMountBegin
    to helpers so they can be called by APIs of both JDK 20 and 21
  • Hide frames between mount/unmount begin and mount/unmount end

Fixes #16984

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thallium commented Apr 6, 2023

@fengxue-IS FYI

@thallium thallium mentioned this pull request Apr 12, 2023
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@thallium thallium force-pushed the jdk21vthreadmount branch 3 times, most recently from 084d53d to 0f06919 Compare May 9, 2023 18:48
@thallium thallium changed the title [WIP] Implement JVM_VirtualThreadMount/JVM_VirtualThreadUnmount Implement JVM_VirtualThreadMount/JVM_VirtualThreadUnmount May 9, 2023
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thallium commented May 9, 2023

@fengxue-IS can you take a look?

@fengxue-IS fengxue-IS self-requested a review May 9, 2023 20:05
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fengxue-IS suggested changes May 9, 2023
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@thallium thallium force-pushed the jdk21vthreadmount branch 4 times, most recently from 715e437 to 0c41d0e Compare May 15, 2023 23:03
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@fengxue-IS Your comments have been addressed.

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fengxue-IS reviewed May 16, 2023
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code looks good, minor format suggestions.
@thallium can you confirm the failure seen in #16346 is fixed

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@fengxue-IS @thallium
"test/hotspot/jtreg/serviceability/jvmti/events/FramePop/framepop02."
test case execution fails.

STDERR:
15:13:29.377 0x272200  j9scar.209    *   ** ASSERTION FAILED ** at /root/openj9-20/openj9-openjdk-jdk20/openj9/runtime/j9vm/javanextvmi.cpp:279: ((isSameOrSuperClassOf((((J9RAMClassRef*)(&((currentThread)->javaVM)->jclConstantPool[(30)]))->value), ((0 != (currentThread)->compressObjectReferences) ? (struct J9Clas

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@fengxue-IS @thallium "test/hotspot/jtreg/serviceability/jvmti/events/FramePop/framepop02." test case execution fails.

STDERR:
15:13:29.377 0x272200  j9scar.209    *   ** ASSERTION FAILED ** at /root/openj9-20/openj9-openjdk-jdk20/openj9/runtime/j9vm/javanextvmi.cpp:279: ((isSameOrSuperClassOf((((J9RAMClassRef*)(&((currentThread)->javaVM)->jclConstantPool[(30)]))->value), ((0 != (currentThread)->compressObjectReferences) ? (struct J9Clas

@dipak-bagadiya Just want to confirm is this my latest change? I've moved the assertion so it won't be checked during mount/unmount.

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@thallium will check with latest commit.

@fengxue-IS fengxue-IS mentioned this pull request May 16, 2023
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@dipak-bagadiya dipak-bagadiya mentioned this pull request May 23, 2023
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@thallium thallium force-pushed the jdk21vthreadmount branch 2 times, most recently from 6130215 to c01be02 Compare May 31, 2023 20:41
keithc-ca
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@thallium thallium changed the title Implement JVM_VirtualThreadMount/JVM_VirtualThreadUnmount Implement JVM_VirtualThread[Mount|Unmount|Start|End] Jun 1, 2023
babsingh
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keithc-ca commented Jun 9, 2023 •
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I merged this into #17514 and ran a small test program that used virtual threads:

19:30:32.718 0x30d900j9vmutil(j9jvmt.16     *   ** ASSERTION FAILED ** at /home/keithc/space/openj9/jdknext/openj9/runtime/util/eventframe.c:87: (!(currentThread->inNative))

Here's an excerpt of the native stack:

4XENATIVESTACK               raiseAssertion+0xf1 (0x00007FC1D7AC6261 [libj9trc29.so+0xe261])
4XENATIVESTACK               doTracePoint+0x965 (0x00007FC1D7AC9EC5 [libj9trc29.so+0x11ec5])
4XENATIVESTACK               javaTrace+0xa0 (0x00007FC1D7AC2010 [libj9trc29.so+0xa010])
4XENATIVESTACK               pushEventFrame+0x189 (0x00007FC1D692D519 [libj9jvmti29.so+0x35519])
4XENATIVESTACK               prepareForEvent+0xef (0x00007FC1D6913F3F [libj9jvmti29.so+0x1bf3f])
4XENATIVESTACK               jvmtiHookVirtualThreadStarted+0xab (0x00007FC1D691530B [libj9jvmti29.so+0x1d30b])
4XENATIVESTACK               J9HookDispatch+0x136 (0x00007FC1DC14F9C6 [libj9hookable29.so+0x19c6])
4XENATIVESTACK               JVM_VirtualThreadStart+0x9e (0x00007FC1DC40086E [libjvm.so+0x2086e])
4XENATIVESTACK               ffi_call_unix64+0x56 (0x00007FC1DC378D06 [libj9vm29.so+0x223d06])
4XENATIVESTACK               ffi_call_int+0x1bc (0x00007FC1DC377CBC [libj9vm29.so+0x222cbc])
4XENATIVESTACK               _ZN37VM_DebugBytecodeInterpreterCompressed3runEP10J9VMThread+0x1da73 (0x00007FC1DC260C63 [libj9vm29.so+0x10bc63])
4XENATIVESTACK               debugBytecodeLoopCompressed+0xd5 (0x00007FC1DC2431E5 [libj9vm29.so+0xee1e5])
4XENATIVESTACK                (0x00007FC1DC3068B2 [libj9vm29.so+0x1b18b2])

Apparently, running under the debugger is significant; the program runs fine otherwise.

@thallium thallium force-pushed the jdk21vthreadmount branch 2 times, most recently from 8605740 to e075bdc Compare June 12, 2023 17:14
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@keithc-ca The assertion failure should be fixed now by moving acquiring VM access from helpers to JVM_* functions.

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@thallium
Implement JVM_VirtualThread[Mount|Unmount|Start|End]
ef5bb83 
- Move code of APIs of JDK 20 such as JVM_VirtualThreadMountBegin
  to helpers so they can be called by APIs of both JDK 20 and 21
- Hide frames between mount/unmount begin and mount/unmount end
- Seperate out code that is specific to first mount and last unmount.

Fixes eclipse-openj9#16984

Outlines of related functions:

virtualThread[Mount|Unmount]Begin:
    enterVThreadTransition()
    virtualThreadHideFrames(true)

virtualThread[Mount|Unmount]End:
    virtualThreadHideFrames(false)
    exitVThreadTransition()

JVM_VirtualThreadMount(bool hide):
    if (hide)
	virtualThreadMountBegin()
    else
	virtualThreadMountEnd()
	TRIGGER_J9HOOK_VM_VIRTUAL_THREAD_MOUNT()

JVM_VirtualThreadUnmount(bool hide):
    if (hide)
	TRIGGER_J9HOOK_VM_VIRTUAL_THREAD_UNMOUNT()
	virtualThreadUnmountBegin()
    else
	virtualThreadUnmountEnd()

JVM_VirtualThreadStart()
    virtualThreadMountEnd()
    TRIGGER_J9HOOK_VM_VIRTUAL_THREAD_STARTED()

JVM_VirtualThreadEnd()
    TRIGGER_J9HOOK_VM_VIRTUAL_THREAD_END()
    virtualThreadUnmountBegin()

Signed-off-by: Gengchen Tuo <gengchen.tuo@ibm.com>
@thallium
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@keithc-ca Your comments have been addressed.

@keithc-ca keithc-ca mentioned this pull request Jun 13, 2023
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Please don't make any more changes to this; #17514 needs to be rebased upon this so ibmruntimes/openj9-openjdk-jdk#608 and an equivalent change for https://github.com/ibmruntimes/openj9-openjdk-jdk21 can all be merged together.

@ChengJin01 ChengJin01 mentioned this pull request Jun 19, 2023
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Any further comments, @babsingh or @fengxue-IS?

Builds in ibmruntimes/openj9-openjdk-jdk#608 have passed and I expect a similar result in ibmruntimes/openj9-openjdk-jdk21#5 after which I am ready to merge #17514 (which includes this) together with ibmruntimes/openj9-openjdk-jdk#608 and ibmruntimes/openj9-openjdk-jdk21#5.

babsingh
babsingh approved these changes Jun 20, 2023
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Any further comments, @babsingh or @fengxue-IS?

No. LGTM.

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Merged via #17514.

@keithc-ca keithc-ca closed this Jun 20, 2023
babsingh added a commit to babsingh/aqa-tests that referenced this pull request Jul 27, 2023
@babsingh
[JDK21] Enable JVMTI framepop02.java#id1
8c9b877 
eclipse-openj9/openj9#17125 fixes framepop02.java#id1, and it was
embedded in eclipse-openj9/openj9#17514 and merged.

Now, the MethodExitTest failure is being tracked through
eclipse-openj9/openj9#17514.

Closes eclipse-openj9/openj9#16346

Signed-off-by: Babneet Singh <sbabneet@ca.ibm.com>
babsingh added a commit to babsingh/aqa-tests that referenced this pull request Jul 27, 2023
@babsingh
[JDK21] Enable JVMTI framepop02.java#id1
afc3021 
eclipse-openj9/openj9#17125 fixes framepop02.java#id1, and it was
embedded in eclipse-openj9/openj9#17514 and merged.

Now, the MethodExitTest failure is being tracked through
eclipse-openj9/openj9#17490.

Closes eclipse-openj9/openj9#16346

Signed-off-by: Babneet Singh <sbabneet@ca.ibm.com>
@babsingh babsingh mentioned this pull request Jul 27, 2023
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llxia pushed a commit to adoptium/aqa-tests that referenced this pull request Jul 27, 2023
@babsingh
[JDK21] Enable JVMTI framepop02.java#id1 (#4687)
38d1716 
eclipse-openj9/openj9#17125 fixes framepop02.java#id1, and it was
embedded in eclipse-openj9/openj9#17514 and merged.

Now, the MethodExitTest failure is being tracked through
eclipse-openj9/openj9#17490.

Closes eclipse-openj9/openj9#16346

Signed-off-by: Babneet Singh <sbabneet@ca.ibm.com>
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JDK21 requires JVM_VirtualThreadMount/JVM_VirtualThreadUnmount implementations
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