lkml.org 
[lkml]   [2004]   [Apr]   [7]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    /
    Date
    From
    SubjectRe: RFC: COW for hugepages
    On Wed, 7 Apr 2004 17:42:39 +1000
    David Gibson <david@gibson.dropbear.id.au> wrote:

    > Currently the kernel does not implement copy-on-write for huge pages -
    > in fact any sort of page fault on a hugepage results in a SIGBUS.
    > This means that hugepages *always* have MAP_SHARED semantics, even if
    > MAP_PRIVATE is requested, and in particular that they are always
    > shared across a fork(). Particularly when using hugetlbfs as just a
    > source of quasi-anonymous memory, those are rather strange semantics.

    [...]

    Implementing this for ppc64 only is just wrong. Before you do this
    I would suggest to factor out the common code in the various hugetlbpage
    implementations and then implement it in common code.

    -Andi
    -
    To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
    the body of a message to majordomo@vger.kernel.org
    More majordomo info at http://vger.kernel.org/majordomo-info.html
    Please read the FAQ at http://www.tux.org/lkml/

    \
     
     \ /
      Last update: 2005-03-22 14:02    [W:0.020 / U:62.472 seconds]
    ©2003-2016 Jasper Spaans. hosted at Digital OceanAdvertise on this site