Re: [PATCH 1/3] perf: add context field to perf_event

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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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