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SubjectRe: [PATCH V2 0/6][RFC] futex: FUTEX_LOCK with optional adaptive spinning
On Sat, Apr 10, 2010 at 16:35, Alan Cox <alan@lxorguk.ukuu.org.uk> wrote:
> You only need one page per 4096 threads

Very expensive. Each cache line would be fought over by 64 threads.
Constant RFOs make context switches significantly slower.

At most 4096/64 = 64 threads should share one page. One page would
still cover almost all processes.


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