Messages in this thread |  | | Subject | Re: RFC: patch to allow lock-free traversal of lists with insertion | From | "Paul McKenney" <> | Date | Tue, 9 Oct 2001 08:28:40 -0700 |
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> On Mon, Oct 08, 2001 at 10:56:10PM -0700, David S. Miller wrote: > > I somehow doubt that you need an IPI to implement the equivalent of > > "membar #StoreStore" on Alpha. Richard? > > Lol. Of course not. Is someone under the impression that AXP > designers were smoking crack?
The ones I have talked to showed no signs of having done so. However, their architecture -does- make it quite challenging for anyone trying to write lock-free common code, hence all the IPIs.
> "wmb" == "membar #StoreStore". > "mb" == "membar #Sync". > > See the nice mb/rmb/wmb macros in <asm/system.h>.
OK, if "membar #StoreStore" really is equivalent to "wmb", then "membar #StoreStore" definitely will -not- do the job required here. Will "membar #SYNC" allow read-side "membar #ReadRead"s to be omitted, or does "membar #SYNC" fail to detect when outstanding cache invalidations complete?
Thanx, Paul
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