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From: Akira Yokosawa <akiyks@gmail.com>
Subject: Feedback on Chapter 9
Message-ID: <fedea970-dfd9-20cd-801c-009051debe4f@gmail.com>
Date: Thu, 21 Jul 2016 23:56:25 +0900
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To: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
Cc: perfbook@vger.kernel.org, Akira Yokosawa <akiyks@gmail.com>
List-ID: <perfbook.vger.kernel.org>

Hi Paul,

I have a few comments on Chapter 9.

1st one is on the description of Figure 9.5.
When one reads the following,

> The ``ideal'' trace was generated by running the sequential code
> shown in Figure 9.2.

one might wonder, "Wait, why a sequential code scales with the number
of CPUs (threads)?"

Of course, route_lookup() of Figure 9.2 can be run concurrently on
multiple CPUs. But it might not be obvious for a novice reader.
Maybe you can make this as a Quick Quiz.

2nd one is for Figure 9.33.

Here, RCU QSBR (quiescent-state-based-reclamation) is mentioned.
However, there seems to be no explanation of what actually it is.
Do you plan to add some explanation or reference?

                                           Thanks, Akira