On Sat, Mar 20, 2021 at 11:23:36AM +0900, Akira Yokosawa wrote:
> Hi Paul,
>
> In Appendix C, which you have not updated for a while,
> there is a statement made in commit bb869fd89bfd ("Add
> caution about cache coherence and I/O for new-to-SMP
> architectures") more than a decade ago, which might
> be an update candidate.
>
> Thoughts?
>
> Thanks, Akira
>
> ------
> diff --git a/appendix/whymb/whymemorybarriers.tex b/appendix/whymb/whymemorybarriers.tex
> index 868758a4..284d48f4 100644
> --- a/appendix/whymb/whymemorybarriers.tex
> +++ b/appendix/whymb/whymemorybarriers.tex
> @@ -1639,7 +1639,7 @@ future such problems:
> It is my painful duty to inform you that as embedded systems
> move to multicore architectures, we will no doubt see a fair
> number of such problems arise.
> - Hopefully these problems will clear up by the year 2015.
> + Hopefully these problems will clear up by the year 202x.
Good catch! I queued the commit shown below.
Thanx, Paul
------------------------------------------------------------------------
commit bd77de3dd7a09e189cda3c6da75628da7fbd4d88
Author: Paul E. McKenney <paulmck@xxxxxxxxxx>
Date: Fri Mar 19 21:06:56 2021 -0700
whymb: Fix outdated date
The year 2015 is no longer in the future.
Reported-by: Akira Yokosawa <akiyks@xxxxxxxxx>
Signed-off-by: Paul E. McKenney <paulmck@xxxxxxxxxx>
diff --git a/appendix/whymb/whymemorybarriers.tex b/appendix/whymb/whymemorybarriers.tex
index 868758a..dc9bd04 100644
--- a/appendix/whymb/whymemorybarriers.tex
+++ b/appendix/whymb/whymemorybarriers.tex
@@ -1639,7 +1639,10 @@ future such problems:
It is my painful duty to inform you that as embedded systems
move to multicore architectures, we will no doubt see a fair
number of such problems arise.
- Hopefully these problems will clear up by the year 2015.
+ By the year 2021, there were some efforts to address
+ these problems with new interconnect standards, with some
+ debate as to how effective these standards will really
+ be~\cite{WilliamGWong2019CCIX-CXL}.
\item Device interrupts that ignore cache coherence.
