passed through dynticks [LWN.net]

passed through dynticks

Posted Apr 27, 2008 0:13 UTC (Sun) by PaulMcKenney (subscriber, #9624)
In reply to: passed through dynticks by ds2horner
Parent article: Integrating and Validating dynticks and Preemptable RCU

Very good -- much simpler formulation!  (A bit faster as well, but as this is the slow path,
the simplicity is more important.)  Passes Promela/spin, and also rcutorture.

Feel free to post feedback, or email it to me if you prefer.  Don't worry about line-number
mismatches, as they will all change anyway.

Would you be willing to review before publication on the next one?  If so, please drop me an
email.

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RCU reviews

Posted Apr 27, 2008 4:03 UTC (Sun) by ds2horner (subscriber, #13438) [Link]

I would be honoured to pre-view the next LWN article.
However, I believe I am mostly out of my league here. 
I hope to not disappoint you.

I understand memory barriers are quite expensive (on most current machines that implement
them), so I have some suggestions for optimizations in rcu_try_flip_waitmb_needed and
rcu_try_flip_waitack_needed. 

And I understand mb is both read and write barrier. I plan on looking into the possibility of
using (the potentially) less expensive read (or write) barriers, if you think they may
benefit.

I did not see your email anywhere on LWN - even in the new "GuestArticles index", so I will
look for your email on lkml. Having seen no other posts here, perhaps we are OK going private
correspondence.

Thanks again for these informative (and thought provoking) articles.