[PATCH] Document Linux's memory barriers [try #5]

Linus Torvalds torvalds at osdl.org
Fri Mar 17 10:55:07 EST 2006

On Thu, 16 Mar 2006, Paul E. McKenney wrote:
> Also, I have some verbiage and diagrams of Alpha's operation at
> http://www.rdrop.com/users/paulmck/scalability/paper/ordering.2006.03.13a.pdf
> Feel free to take any that helps.  (Source for paper is Latex and xfig,
> for whatever that is worth.)

This paper too claims that x86-64 has somehow different memory ordering 
constraints than regular x86. Do you actually have a source for that 
statement, or is it just a continuation of what looks like confusion in 
the Linux x86-64 header files?

(Also, x86 doesn't have an incoherent instruction cache - some older x86 
cores have an incoherent instruction decode _buffer_, but that's a 
slightly different issue with basically no effect on any sane program).


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