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    SubjectRe: [PATCH 0/11] LTTng-core (basic tracing infrastructure) 0.5.108
    On Sat, Sep 16, 2006 at 09:37:45PM +0200, Ingo Molnar wrote:
    > --------------->
    > Subject: [patch] kprobes: speed INT3 trap handling up on i386
    > From: Ingo Molnar <>
    > speed up kprobes trap handling by special-casing kernel-space
    > INT3 traps (which do not occur otherwise) and doing a kprobes
    > handler check - instead of redirecting over the i386-die-notifier
    > chain.
    Hi Ingo,

    Not that it would make any difference to the actual kprobe performance,
    but I think that not using the die-notifier chain makes the DIE_INT3
    handling in kprobe_exceptions_notify() useless.


    Signed-off-by: Frederik Deweerdt <>

    diff --git a/arch/i386/kernel/kprobes.c b/arch/i386/kernel/kprobes.c
    index afe6505..90787ff 100644
    --- a/arch/i386/kernel/kprobes.c
    +++ b/arch/i386/kernel/kprobes.c
    @@ -652,10 +652,6 @@ int __kprobes kprobe_exceptions_notify(s
    return ret;

    switch (val) {
    - case DIE_INT3:
    - if (kprobe_handler(args->regs))
    - ret = NOTIFY_STOP;
    - break;
    case DIE_DEBUG:
    if (post_kprobe_handler(args->regs))
    ret = NOTIFY_STOP;
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      Last update: 2006-09-17 10:17    [W:0.022 / U:1.868 seconds]
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