[Devel] Re: [PATCH 2/3] ftrace: use struct pid

[Steven Rostedt]

On Thu, 4 Dec 2008, Dave Hansen wrote:
> > 
> > We probably should.  Historically read_lock(&tasklist_lock) implies
> > rcu_read_lock().  And the tasklist lock is what we hold when it is
> > safe.
> 
> So, Dipankar tells me that you really do need rcu_read_lock/unlock() for
> the guarantee here; the tasklist lock is not sufficient.  The realtime
> kernel will preempt even those sections covered by spinlocks.

Yes it will.

-- Steve

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