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> I am concerned about providing a librseq that handles rseq registration for early adopters though

Sounds very reasonable.

So at this point, as far as I understand it, FB and Google carry in-house rseq kernel and user space patches. Right? Are they on board with the mainline rseq? Will FB support rseq in jemalloc any time soon?

-ss

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I've been in touch with FB. They are interested in using rseq for jemalloc. They have provided prototypes of jemalloc based on rseq, along with benchmarks helping me make the case for rseq mainlining.

I don't know whether Google will ever want to swap from their in house rseq implementation to the upstream Linux rseq, use both ABIs for a transition period, or simply keep using their own in-house rseq.

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