Re: [PATCH] x86/mm: Enable 5-level paging support by default

2019-09-16 Thread Ingo Molnar
* Dave Hansen wrote: > On 9/13/19 2:54 AM, Kirill A. Shutemov wrote: > > The next major release of distributions expected to have > > CONFIG_X86_5LEVEL=y. > > It's probably worth noting that this exposes to two kinds of possible > performance issues: > > First is the overhead of having the

Re: [PATCH] x86/mm: Enable 5-level paging support by default

2019-09-13 Thread Dave Hansen
On 9/13/19 2:54 AM, Kirill A. Shutemov wrote: > The next major release of distributions expected to have > CONFIG_X86_5LEVEL=y. It's probably worth noting that this exposes to two kinds of possible performance issues: First is the overhead of having the 5-level code on 4-level hardware. We