lkml.org 
[lkml]   [2008]   [May]   [26]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH] kmemcheck: SMP support
Vegard Nossum wrote:
> On Fri, May 23, 2008 at 5:06 PM, Ingo Molnar <mingo@elte.hu> wrote:
>
>> Vegard, wanna have a look at introducing per CPU kernel pagetables? I
>> tried that once in the past and it wasnt too horrible. (the patches are
>> gone though) We could do it before bringing other CPUs online, i.e. much
>> of the really yucky boot time pagetable juggling phase would be over
>> already. Hm?
>>
>
> Ingo.
>
> It really doesn't matter how easy it was for you.
>
> You're one of the x86 maintainers.
>
> And I think you're forgetting how hard these things are for a newbie.
> I don't even know which one comes first of pmds and puds.
>
> Per-cpu page tables sounds about on the same scale of as, say,
> rewriting the VM or some other major subsystem. Epic!
>
>

You might be able to pull off a simple implementation using
paravirt_ops, without impacting the core VM.

Basically, you keep the current global pagetables, but never set them as
real pagetables. Instead you keep per-cpu copies of these pagetables
and sync them from the master pagetable as needed.

--
error compiling committee.c: too many arguments to function



\
 
 \ /
  Last update: 2008-05-26 11:33    [W:0.039 / U:0.060 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site