--
On Fri, 24 Aug 2007, john stultz wrote:
> >
> > - /* calculate the delta since the last update_wall_time: */
> > - cycle_delta = (cycle_now - clock->cycle_last) & clock->mask;
> > + } while (cycle_raw != clock->cycle_raw ||
> > + cycle_last != clock->cycle_last);
>
> So if I'm understanding this right, not taking a lock isn't an
> optimization (as the seq read lock code is almost the same), but a
> requirement (as this might be called while xtime_lock is held),
> correct?
Exactly. The latency tracer uses this so no locks can be grabbed
(seq_locks included).
>
> Might want to clarify that a bit in the comment.
>
OK, will do and send a updated patch.
I wasn't in the best state writing this patch in the wee hours of the
night ;-)
-- Steve
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