On 13.07.2018 23:10, Jaromír Doleček wrote: > 2018-07-13 22:54 GMT+02:00 Kamil Rytarowski <n54%gmx.com@localhost>: >> I disagree with disabling it. The code is not broken, it's covered by >> tests, it's in use. > > This looks like perfect candidate for optional (default off) feature. > It is useless and dangerous for general purpose use by virtue of being > root only, but useful for specialized use. > > Honestly, I don't see any reason to have this on by default. > > Jaromir > We have got this state now. It's a trade-off that we disable it for user, and keep for root and those who use it (sysctl switch). I agree that there might be a microoptimization with not reloading DR, but there is a bigger fish to fry at this point rather than winning 0,3% of performance by killing a feature that is in use. If anything, the proper solution is to optimize the register switch.
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