Re: [PATCH] Document Linux's memory barriers [try #2]

Jesse Barnes
2006-03-09T04:18:19Z

On Wednesday, March 08, 2006 5:36 pm, Paul Mackerras wrote:
> Jesse Barnes writes:
> > It uses a per-node address space to reference the local bridge.
> > The local bridge then waits until the remote bridge has acked the
> > write before, then sets the outstanding write register to the
> > appropriate value.
>
> That sounds like mmiowb can only be used when preemption is disabled,
> such as inside a spin-locked region - is that right?

There's a scheduler hook to flush things if a process moves. I think
Brent Casavant submitted that patch recently.

Jesse