Re: [tip:x86/mm] x86/boot/compressed/64: Describe the logic behind the LA57 check
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- Subject: Re: [tip:x86/mm] x86/boot/compressed/64: Describe the logic behind the LA57 check
- From: Ingo Molnar <mingo@xxxxxxxxxx>
- Date: Mon, 12 Mar 2018 15:32:12 +0100
- Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>, kirill.shutemov@xxxxxxxxxxxxxxx, gorcunov@xxxxxxxxxx, luto@xxxxxxxxxxxxxx, keescook@xxxxxxxxxxxx, willy@xxxxxxxxxxxxx, torvalds@xxxxxxxxxxxxxxxxxxxx, tglx@xxxxxxxxxxxxx, bp@xxxxxxx, andy.shevchenko@xxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx, hpa@xxxxxxxxx, ebiederm@xxxxxxxxxxxx, jgross@xxxxxxxx, linux-tip-commits@xxxxxxxxxxxxxxx
- In-reply-to: <20180312140449.oyngtgqppnjuh3lf@node.shutemov.name>
- References: <20180226180451.86788-2-kirill.shutemov@linux.intel.com> <tip-a403d798182f4f7be5e9bab56cfa37e9828fd92a@git.kernel.org> <20180312124027.GG4064@hirez.programming.kicks-ass.net> <20180312124337.vw7bchm6brfzghfa@node.shutemov.name> <20180312131055.GH4064@hirez.programming.kicks-ass.net> <20180312140449.oyngtgqppnjuh3lf@node.shutemov.name>
- User-agent: NeoMutt/20170609 (1.8.3)
* Kirill A. Shutemov <kirill@xxxxxxxxxxxxx> wrote:
> > We can of course bike shed / benchmark this once my desktop refresh
> > sports this feature, but ISTR this being one of the very first things
> > Ingo mentioned when we started this whole 5L thing.
>
> I would rather not fix the problem that may not actually exist. :)
That 5 level pagetables involve more overhead is a realy problem.
By default we should only enable 5-level paging if memory mappings exist in
the memory map that require the extended physical memory space.
Thanks,
Ingo
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