Il 15/06/2014 14:47, Peter Zijlstra ha scritto:
XXX: merge into the pending bit patch..
Agree, or if not move it right after the pending bit patch, before the NR_CPUS optimization.
Paolo
It is possible so observe the pending bit without the locked bit when the last owner has just released but the pending owner has not yet taken ownership. In this case we would normally queue -- because the pending bit is already taken. However, in this case the pending bit is guaranteed to be released 'soon', therefore wait for it and avoid queueing. Signed-off-by: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
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