lkml.org 
[lkml]   [2017]   [Jul]   [7]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    /
    Date
    From
    SubjectRe: [PATCH 1/3] Protectable memory support
    On Fri, Jul 07, 2017 at 11:42:09AM +0300, Igor Stoppa wrote:
    > On 06/07/17 19:27, Jerome Glisse wrote:
    > > On Wed, Jul 05, 2017 at 04:46:26PM +0300, Igor Stoppa wrote:

    [...]

    > > Yet another way is to use some of the free struct page fields ie
    > > when a page is allocated for vmalloc i think most of struct page
    > > fields are unuse (mapping, index, lru, ...). It would be better
    > > to use those rather than adding a page flag.
    >
    > Like introducing an unnamed union? Some sort of vmalloc_page_subtype?
    > If that is what you are proposing, I agree that it would work in a
    > similar fashion as what I have now, but without introducing the overhead
    > of the extra page flag.

    No need to introduce unamed union or anything. Just use one of the
    existing field for install you can make page->mapping point to the
    pmalloc pool structure. Or you can store a unique key value.

    I believe there is enough unuse field that for vmalloc pages that
    you should find one you can use. Just add some documentation in
    mm_types.h so people are aware of alternate use for the field you
    are using.

    Jérôme

    \
     
     \ /
      Last update: 2017-07-07 20:49    [W:3.749 / U:0.088 seconds]
    ©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site