lkml.org 
[lkml]   [2012]   [Jul]   [3]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    /
    Date
    From
    SubjectRe: [PATCH 04/40] xen: document Xen is using an unused bit for the pagetables
    Hi Konrad,

    On Sat, Jun 30, 2012 at 12:47:18AM -0400, Konrad Rzeszutek Wilk wrote:
    > On Thu, Jun 28, 2012 at 02:55:44PM +0200, Andrea Arcangeli wrote:
    > > Xen has taken over the last reserved bit available for the pagetables
    >
    > Some time ago when I saw this patch I asked about it (if there is way
    > to actually stop using this bit) and you mentioned it is not the last
    > bit available for pagemaps. Perhaps you should alter the comment
    > in this description?

    As far as I can tell the comment is correct, it is the last bit
    available. Simply I don't need to use it anymore. There are 3 reserved
    bits, one is used by Xen, the second is used by SPECIAL the third is
    used by kmemcheck.

    > > which is set through ioremap, this documents it and makes the code
    >
    > It actually is through ioremap, gntdev (to map another guest memory),
    > and on pfns which fall in E820 on the non-RAM and gap sections.

    Well I dropped this patch, there's too much other important work to
    do, this is only a documentation improvement and a cleanup and I don't
    need it.


    \
     
     \ /
      Last update: 2012-07-03 13:21    [W:6.681 / U:0.000 seconds]
    ©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site