On Tue, 2007-11-20 at 07:26 +0100, Nick Piggin wrote:
>
> BTW, here is another thing which you might want to think about. Again
> untested for temporary lack of hardware.
>
> --
>
> The radix-tree is now RCU safe, so powerpc can avoid the games it was playing
> in order to have a lockless reads
On Tue, Nov 20, 2007 at 05:08:24PM +1100, Benjamin Herrenschmidt wrote:
>
> On Tue, 2007-11-20 at 06:09 +0100, Nick Piggin wrote:
> > This isn't a bugfix, but may help performance slightly...
> >
> > --
> > powerpc 64-bit hash pte lock bit is an actual lock, so it can take advantage
> > of lock b
On Tue, 2007-11-20 at 06:09 +0100, Nick Piggin wrote:
> This isn't a bugfix, but may help performance slightly...
>
> --
> powerpc 64-bit hash pte lock bit is an actual lock, so it can take advantage
> of lock bitops for slightly more optimal memory barriers (can avoid an lwsync
> in the trylock)
