On Tue, 26 Mar 2024 21:55:38 GMT, Kevin Walls <kev...@openjdk.org> 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 not a >> general-purpose customer-facing tool. > > Kevin Walls has updated the pull request incrementally with one additional > commit since the last revision: > > Undo include 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. src/hotspot/share/services/diagnosticCommand.hpp line 590: > 588: } > 589: static const char* description() { > 590: return "Inspect VM object at address."; Maybe distinguishing between java heap objects and VM objects would be useful to the reader/user. src/hotspot/share/utilities/debug.cpp line 679: > 677: } > 678: > 679: // Additional "good oop" checks, separate method to not disturb existing > asserts. Suggestion: // Additional "good oop" checks. Separate method to not disturb existing asserts. src/hotspot/share/utilities/debug.cpp line 680: > 678: > 679: // Additional "good oop" checks, separate method to not disturb existing > asserts. > 680: extern "C" bool dbg_is_good_oop_detailed(oopDesc* o) { What was the motivation for adding this? Is this copied from other HS code? How do we know it's doing a good enough job of verification? What happens if verification is not thorough enough? test/hotspot/jtreg/serviceability/dcmd/vm/VMInspectTest.java line 83: > 81: } > 82: > 83: // Tests where enabled: Suggestion: // Tests run with VM.inspect support enabled: ------------- PR Review: https://git.openjdk.org/jdk/pull/17655#pullrequestreview-1962319603 PR Review Comment: https://git.openjdk.org/jdk/pull/17655#discussion_r1540483489 PR Review Comment: https://git.openjdk.org/jdk/pull/17655#discussion_r1540485389 PR Review Comment: https://git.openjdk.org/jdk/pull/17655#discussion_r1540486518 PR Review Comment: https://git.openjdk.org/jdk/pull/17655#discussion_r1540492385