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

[Avi Kivity]

On 07/12/2011 12:41 PM, Joerg Roedel wrote:
> >  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.
>
> I would rather vote for Avi's solution too. Such a functionality is very
> helpful for LWP-perf integration as well (because we need a way to call
> do_mmap for a task != current).

It's not needed for that.  See use_mm() (caller must be a kernel thread).

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

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