On 9/10/20 3:24 AM, Steven Price wrote: > It is a shame, however I suspect this is because to use those instructions you > need to know the block size held in GMID_EL1. And at least in theory that > could > vary between CPUs.
Which is no different from having to read DCZID_EL0 in order to implement memset, in my opinion. But, whatever. > When we have some real hardware it would be worth profiling this. At the > moment > I've no idea whether the kernel entry overhead would make such an interface > useful from a performance perspective or not. Yep. r~
