RFR: 8306591: SA and hotspot generate different hprof records for GC roots

[Chris Plummer]

On Wed, 18 Feb 2026 09:11:34 GMT, Yasumasa Suenaga <ysuenaga at openjdk.org> wrote:

> We can extract heapdump from coredump via `jhsdb jmap --binaryheap`. However GC roots for system classes (`HPROF_GC_ROOT_STICKY_CLASS`) are not available i it even though heapdump from HotSpot contains.
> 
> SA should generate `HPROF_GC_ROOT_STICKY_CLASS` into heapdump.

test/hotspot/jtreg/serviceability/sa/ClhsdbDumpheap.java line 75:

> 73:         try (var snapshot = HprofReader.readFile(file, false, 0)) {
> 74:             for (var root = snapshot.getRoots(); root.hasMoreElements();) {
> 75:                 if (root.nextElement().getType() == Root.SYSTEM_CLASS) {

Was this change intentional or was it just meant to be temporary test of your changes?

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PR Review Comment: https://git.openjdk.org/jdk/pull/29781#discussion_r2825394748