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    SubjectRe: [PATCH 1/3] perf: add context field to perf_event
    On 07/12/2011 12:31 PM, Peter Zijlstra wrote:
    > >
    > > But it means that 'current' is not set to the right value. If the
    > > function depends on it, then it will misbehave. And in fact
    > > preempt_notifier_register(), which is the function we want to call here,
    > > does depend on current.
    > >
    > > Of course we need to find more users for this, but I have a feeling this
    > > will be generally useful. The alternative is to keep adding bits to
    > > thread_info::flags.
    >
    > Using TIF_bits sounds like a much better solution for this, wakeups are
    > really rather expensive and its best to avoid extra if at all possible.
    >

    We do need a way to make the task look at them.

    --
    I have a truly marvellous patch that fixes the bug which this
    signature is too narrow to contain.



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