On Wed, 27 Mar 2024 05:12:53 GMT, Chris Plummer wrote:
>> Serguei Spitsyn has updated the pull request with a new target base due to a
>> merge or a rebase. The incremental webrev excludes the unrelated changes
>> brought in by the merge/rebase. The pull request contains three additional
>>
> This PR fixes a synchronization issue in the test:
> `test/hotspot/jtreg/serviceability/jvmti/vthread/PopFrameTest`
>
> The method `notifyAtBreakpoint()` can notify the `TestTask` thread when it
> has not reached an expected breakpoint yet.
> The fix is to add a call to the method
On Tue, 26 Mar 2024 21:42:15 GMT, Chris Plummer wrote:
> A docs CR will need to be filed to get it updated (and I see it is already
> appears out-of-date w.r.t. HeapDumpGzipLevel)
Sorry maybe it is maybe obvious for you but where should I open a "docs CR",
would that be a separate JBS issue
> Introduce the jcmd "VM.inspect" to implement access to detailed JVM object
> information.
>
> Not recommended for live production use. Requires UnlockDiagnosticVMOptions
> and not included in jcmd help output, to remind us this is not a
> general-purpose customer-facing tool.
Kevin Walls
> Currently jcmd command GC.heap_dump only works with an additionally provided
> file name.
> Syntax : GC.heap_dump [options]
>
> In case the JVM has the XX - flag HeapDumpPath set, we should support an
> additional mode where the is optional.
> In case the filename is NOT set, we take the
On Tue, 26 Mar 2024 21:55:38 GMT, Kevin Walls wrote:
>> Introduce the jcmd "VM.inspect" to implement access to detailed JVM object
>> information.
>>
>> Not recommended for live production use. Requires UnlockDiagnosticVMOptions
>> and not included in jcmd help output, to remind us this is
On Wed, 27 Mar 2024 12:23:50 GMT, Kevin Walls wrote:
>> Introduce the jcmd "VM.inspect" to implement access to detailed JVM object
>> information.
>>
>> Not recommended for live production use. Requires UnlockDiagnosticVMOptions
>> and not included in jcmd help output, to remind us this is
> Diagnostic command for zeroing unused parts of the heap
>
> I propose to add a new diagnostic command `System.zero_unused_memory` which
> zeros out all unused parts of the heap. The name of the command is
> intentionally GC/heap agnostic because in the future it might be extended to
> also
On Wed, 27 Mar 2024 09:33:43 GMT, Thomas Stuefe wrote:
> In my opinion, UnlockDiagnosticVMOptions is not a good enough safeguard since
> it guards a whole swathe of switches that we may instruct the customer to
> enable. Once enabled, my experience is that UnlockDiagnosticVMOptions often
>
Diagnostic command for zeroing unused parts of the heap
I propose to add a new diagnostic command `System.zero_unused_memory` which
zeros out all unused parts of the heap. The name of the command is
intentionally GC/heap agnostic because in the future it might be extended to
also zero unused
On Wed, 27 Mar 2024 05:44:25 GMT, Chris Plummer wrote:
> It looks like the test only inspects a thread and a java object. Perhaps you
> could add tests for additional VM objects. Maybe grab a frame PC from a
> thread stack trace.
Yes - added a couple of metadata tests, and a compiled method
> Introduce the jcmd "VM.inspect" to implement access to detailed JVM object
> information.
>
> Not recommended for live production use. Requires UnlockDiagnosticVMOptions
> and not included in jcmd help output, to remind us this is not a
> general-purpose customer-facing tool.
Kevin Walls
On Wed, 27 Mar 2024 06:44:37 GMT, Serguei Spitsyn wrote:
>> This PR fixes a synchronization issue in the test:
>> `test/hotspot/jtreg/serviceability/jvmti/vthread/PopFrameTest`
>>
>> The method `notifyAtBreakpoint()` can notify the `TestTask` thread when it
>> has not reached an expected
On Wed, 27 Mar 2024 22:04:30 GMT, Jonathan Gibbons wrote:
> Please review the updates to support a proposed new
> `-Xlint:dangling-doc-comments` option.
>
> The work can be thought of as in 3 parts:
>
> 1. An update to the `javac` internal class `DeferredLintHandler` so that it
> is possible
On Wed, 27 Mar 2024 20:08:19 GMT, Chris Plummer wrote:
>> Serguei Spitsyn has updated the pull request incrementally with one
>> additional commit since the last revision:
>>
>> review: improve diagnostics and reliability
>
>
Please review the updates to support a proposed new
`-Xlint:dangling-doc-comments` option.
The work can be thought of as in 3 parts:
1. An update to the `javac` internal class `DeferredLintHandler` so that it is
possible to specify the appropriately configured `Lint` object when it is time
to
On Wed, 27 Mar 2024 22:04:30 GMT, Jonathan Gibbons wrote:
> Please review the updates to support a proposed new
> `-Xlint:dangling-doc-comments` option.
>
> The work can be thought of as in 3 parts:
>
> 1. An update to the `javac` internal class `DeferredLintHandler` so that it
> is possible
On Wed, 27 Mar 2024 22:04:30 GMT, Jonathan Gibbons wrote:
> Please review the updates to support a proposed new
> `-Xlint:dangling-doc-comments` option.
>
> The work can be thought of as in 3 parts:
>
> 1. An update to the `javac` internal class `DeferredLintHandler` so that it
> is possible
On Wed, 27 Mar 2024 13:44:42 GMT, Matthias Baesken wrote:
>> Currently jcmd command GC.heap_dump only works with an additionally provided
>> file name.
>> Syntax : GC.heap_dump [options]
>>
>> In case the JVM has the XX - flag HeapDumpPath set, we should support an
>> additional mode where
On Wed, 27 Mar 2024 12:36:31 GMT, Matthias Baesken wrote:
> Sorry maybe it is maybe obvious for you but where should I open a "docs CR",
> would that be a separate JBS issue with Component name docs ?
You would file a JBS issue with component "docs" and subcategory "hotspot". But
let's hold
On Wed, 27 Mar 2024 23:05:22 GMT, David Holmes wrote:
> Notwithstanding that there may be cases where this change would be
> convenient...
I did get feedback from a couple of our support engineers. One felt it was of
no real benefit as it was just as easy to provide the filename as an
On Wed, 27 Mar 2024 22:41:33 GMT, Pavel Rappo wrote:
> Would this be the first lint -- not doclint -- warning related to comments,
> let alone doc comments?
No. `-Xlint:dep-ann` correlates `@Deprecated` annotations with `@deprecated`
tags in doc comments.
>
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