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

Avi Kivity
2011-07-12T09:44:51Z

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.