Messages in this thread | | | Subject | Re: [tip:core/locking 2/3] lockdep:define preallocated "stack" for BFS as per cpu variable | From | Peter Zijlstra <> | Date | Wed, 22 Jul 2009 15:19:15 +0200 |
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On Wed, 2009-07-22 at 21:10 +0800, Ming Lei wrote: > 2009/7/22 Peter Zijlstra <a.p.zijlstra@chello.nl>: > > On Wed, 2009-07-22 at 20:58 +0800, tom.leiming@gmail.com wrote: > >> From: Ming Lei <tom.leiming@gmail.com> > > > > This patch can use a changelog. > > > > Why is this needed, isn't all that serialized by the graph_lock anyway? > > Or are there a few paths where this isn't the case and we're now racy? > > It is really serialized by the graph_lock, but we can prevent cpu cache from > being flushing by different cpu access, which seems that can be avoided by > per cpu variables. Right?
I doubt it'll make a difference, got any numbers to back that up?
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