Re: [PATCH RFC] x86: avoid atomic operation in test_and_set_bit_lock if possible

Jack Steiner
2011-03-24T17:31:26Z

>
> This cacheline bouncing was actually observed and measured
> on SGI UV systems, but I'm not certain we're permitted to publish
> that data. I'm copying the two SGI guys who had reported that
> issue (and the special case fix, which Nikanth simply generalized)
> to us, for them to decide.

We frequently run into the cacheline bouncing issues. I don't have
the data handy that you refer to, but feel free to publish it.

--- jack