This commit a little bit improves the logic of a writer thread. The
new logic lets the writer go back to the original CPU after run_on()
the final CPU.
Of course it is a trivial improvement and the original two lines
pseudocode is beautiful. If it isn't worth to apply, please ignore it.
Signed-off-by: Hitoshi Mitake <mitake.hitoshi@xxxxxxxxx>
---
defer/rcuintro.tex | 7 +++++--
1 file changed, 5 insertions(+), 2 deletions(-)
diff --git a/defer/rcuintro.tex b/defer/rcuintro.tex
index 03d6e12..135922c 100644
--- a/defer/rcuintro.tex
+++ b/defer/rcuintro.tex
@@ -166,8 +166,11 @@ quite complex, a toy implementation is exceedingly simple:
\begin{minipage}[t]{\columnwidth}
\scriptsize
\begin{verbatim}
- 1 for_each_online_cpu(cpu)
- 2 run_on(cpu);
+ 1 int orig_cpu = smp_processor_id();
+ 2 for_each_online_cpu(cpu)
+ 3 run_on(cpu);
+ 4 if (orig_cpu != smp_processor_id())
+ 5 run_on(orig_cpu);
\end{verbatim}
\end{minipage}
\vspace{5pt}
--
1.9.1
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