lkml.org 
[lkml]   [2013]   [Aug]   [21]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
SubjectRe: Regression: x86/mm: new _PTE_SWP_SOFT_DIRTY bit conflicts with existing use
From
Date
But is there a manifest bug or not?  What is the deal with Xen?

Cyrill Gorcunov <gorcunov@gmail.com> wrote:
>On Wed, Aug 21, 2013 at 09:25:47PM +0400, Cyrill Gorcunov wrote:
>> >
>> > However, I do find the use of PTE bits in this way somewhat
>fragile.
>> > What other potential corner cases might still remain that will
>require
>> > further games with PTE bits?
>>
>> OK, so this is not a bug finally. The problem is that 2 level pte
>is
>> quite small and 7th bit is the only one spare I can use for soft
>dirty
>> tracking when page get swapped out. And swap engine is very depending
>> on pte being non-present, so we are on a safe side.
>
>To make it clear: I'm working on patch that won't use pse bit for dirty
>page tracking, just give some time to cook it and test.

--
Sent from my mobile phone. Please excuse brevity and lack of formatting.


\
 
 \ /
  Last update: 2013-08-21 21:21    [W:0.750 / U:0.344 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site