RFR: 8366082: Improve queue size computation in CPU-time sampler

[Kerem Kat]

On Mon, 25 Aug 2025 12:41:11 GMT, Johannes Bechberger <jbechberger at openjdk.org> wrote:

> Improve the sample queue size computation for the CPU-time sampler by increasing the size dynamically when needed, but keeping the default size small.

src/hotspot/share/jfr/periodic/sampling/jfrCPUTimeThreadSampler.cpp line 185:

> 183:     }
> 184:     if (factor > 1) {
> 185:       u4 new_capacity = _capacity * factor > CPU_TIME_QUEUE_MAX_CAPACITY ? CPU_TIME_QUEUE_MAX_CAPACITY : capacity * factor;

I noticed the check uses `_capacity` but the assignment uses `capacity`. Should both be using `capacity`?

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PR Review Comment: https://git.openjdk.org/jdk/pull/26926#discussion_r2298120010