Messages in this thread | | | Date | Mon, 15 Nov 2010 15:07:39 +0100 | From | Andi Kleen <> | Subject | Re: [PATCH] atomic: add atomic_inc_not_zero_hint() |
| |
On Mon, Nov 15, 2010 at 07:57:10AM -0600, Christoph Lameter wrote: > On Sat, 13 Nov 2010, Paul E. McKenney wrote: > > > On Fri, Nov 12, 2010 at 01:14:12PM -0600, Christoph Lameter wrote: > > > > > > prefetchw() would be too much overhead? > > > > No idea. Where do you believe that prefetchw() should be added? > > It is another way to get an exclusive cache line > for situations like this. No need to give a hint.
prefetchw doesn't work on Intel (or rather is equivalent to prefetch), for Intel you always need to explicitely write to get an exclusive line.
-Andi
-- ak@linux.intel.com -- Speaking for myself only.
| |