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    SubjectRe: [PATCH 1/5] 2.6.0 fix preempt ctx switch accounting
    * Nick Piggin <piggin@cyberone.com.au> wrote:

    > Make sure to count kernel preemption as a context switch. A short cut
    > has been preventing it.

    i'd prefer the much simpler patch below. This also keeps the kernel
    preemption logic isolated instead of mixing it into the normal path.

    Ingo

    --- linux/kernel/sched.c.orig
    +++ linux/kernel/sched.c
    @@ -1520,8 +1520,10 @@ need_resched:
    * if entering off of a kernel preemption go straight
    * to picking the next task.
    */
    - if (unlikely(preempt_count() & PREEMPT_ACTIVE))
    + if (unlikely(preempt_count() & PREEMPT_ACTIVE)) {
    + prev->nivcsw++;
    goto pick_next_task;
    + }

    switch (prev->state) {
    case TASK_INTERRUPTIBLE:
    -
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