lkml.org 
[lkml]   [2022]   [Jan]   [18]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [RFC PATCH 0/6] Add support for shared PTEs across processes
On Tue, Jan 18, 2022 at 01:41:40PM -0800, Dave Hansen wrote:
> On 1/18/22 1:19 PM, Khalid Aziz wrote:
> > - Starting address must be aligned to pgdir size (512GB on x86_64)
>
> How does this work on systems with 5-level paging where a top-level page
> table entry covers 256TB? Is the alignment requirement 512GB or 256TB?
> How does userspace figure out which alignment requirement it is subject to?

The original idea was any power of two, naturally aligned, >= PAGE_SIZE,
but I suspect Khalid has simplified it for this first implementation.

\
 
 \ /
  Last update: 2022-09-17 16:12    [W:0.347 / U:0.240 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site