Messages in this thread | | | Date | Tue, 4 Feb 2014 20:05:35 +0100 | From | Peter Zijlstra <> | Subject | Re: mips octeon memory model questions |
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On Tue, Feb 04, 2014 at 10:58:40AM -0800, Linus Torvalds wrote: > On Tue, Feb 4, 2014 at 10:41 AM, Peter Zijlstra <peterz@infradead.org> wrote: > > > > Still doesn't make sense, because if we need the first sync to stop > > writes from being re-ordered with the ll-sc, we also need the second > > sync to avoid the same. > > Presumably octeon doesn't do speculative writes, only *buffered* writes.
Speculative writes are bad.. :-)
> So writes move down, not up.
Right, but the ll-sc store might move down over a later store. Say because the ll-sc needs to first get exclusive ownership of the cacheline where the later store would be to an already owned line.
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