lkml.org 
[lkml]   [2003]   [Feb]   [12]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    /
    From
    SubjectRe: [Bug 350] New: i386 context switch very slow compared to 2.4 due to wrmsr (performance)
    Date
    In article <20030212101831.GB10422@bjl1.jlokier.co.uk>,
    Jamie Lokier <jamie@shareable.org> wrote:
    >
    >I meant: the trampoline _stack_ lives in the TSS.
    >
    >There is no trampoline _code_.

    Ahh, ok. That sounds quite doable, and all my complaints go away.

    It still leaves the debug exception and NMI issue.

    The debug exception case is easy to trigger: use gdb to single-step
    through the user-lebel fast system call code, and you _will_ get a debug
    exception on the very first kernel instruction (which is also the one
    that doesn't have a valid stack).

    So anybody want to actually try to implement this?

    Linus
    -
    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 13:33    [W:0.039 / U:0.136 seconds]
    ©2003-2016 Jasper Spaans. hosted at Digital OceanAdvertise on this site