lkml.org 
[lkml]   [2007]   [Feb]   [14]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    /
    Date
    From
    SubjectRe: [patch 05/11] syslets: core code
    On Wed, Feb 14, 2007 at 10:46:29AM +0100, Ingo Molnar (mingo@elte.hu) wrote:
    >
    > * Evgeniy Polyakov <johnpol@2ka.mipt.ru> wrote:
    >
    > > This will end up badly - I used the same approach in the early kevent
    > > days and was proven to have swapable memory for the ring. I think it
    > > would be much better to have userspace allocated ring and use
    > > copy_to_user() there.
    >
    > it is a userspace allocated ring - but pinned down by the kernel.

    That's a problem - 1000/512 pages per 'usual' thread ends up with the
    whole memory locked by malicious/stupid application (at least on Debian
    and Mandrake there is no locked memory limit by default). And if such
    a limit exists, this will hurt big-iron applications, which want to used
    high-order rings legitimely.

    > Ingo

    --
    Evgeniy Polyakov
    -
    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: 2007-02-14 11:15    [W:0.020 / U:31.624 seconds]
    ©2003-2016 Jasper Spaans. hosted at Digital OceanAdvertise on this site