| Date | Wed, 18 Jun 2014 13:42:13 +0200 | From | Paolo Bonzini <> | Subject | Re: [PATCH 06/11] qspinlock: Optimize pending bit |
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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@infradead.org>
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