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    SubjectRe: [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.


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