On Fri, 21 Aug 2026 16:27:12 GMT, Andrew Haley <[email protected]> wrote:
>> We are hitting 3x (!) more uncommon traps on mid-level PCRs; I suspect that >> is why warmup is that much worse. > > But that comment is about type profiles, and we never subsample 0->1 updates, > regardless of capture ratio. We first look at whether a type has been seen at > all, even only once, and only if it has do we subsample. Yeah, but thinking that uncommon traps are maybe about cold branches, the branch data that lost 0->1 update due to subsampling looks to be a plausible way to get extra uncommon trap? Something along those lines... ------------- PR Comment: https://git.openjdk.org/jdk/pull/28541#issuecomment-5375444238
