On Thu, Aug 10, 2023 at 09:55:50AM +0100, Szabolcs Nagy wrote: > The 08/09/2023 16:34, Mark Brown wrote: > > It's actually based on bitrot that I'd initially chosen a smaller value > > since it's likely that functions will push at least something as you > > suggest, the patches now just use RLIMIT_STACK. I'll fix. > the pcs requires 16byte aligned stack frames, with 8byte per gcs entry > there is no need for same gcs size as stack size in userspace. I agree that it's going to be excessive for pretty much all applications, I adjusted it to match x86 as part of the general effort to avoid divergence and because I was a bit concerned about non-PCS cases (eg, JITed code) potentially running into trouble, especially with smaller stack limits. It's not an issue I have super strong opinions on though, as you can see I had implemented it both ways at various times.
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