Messages in this thread | | | Date | Mon, 14 Oct 2013 11:05:08 +0200 | From | Peter Zijlstra <> | Subject | Re: [PATCH 0/6] Optimize the cpu hotplug locking -v2 |
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On Sat, Oct 12, 2013 at 07:06:56PM +0200, Oleg Nesterov wrote: > it even disables irqs, so this should always imply rcu_read_lock() with > any implementation,
Not so; I could make an RCU implementation that drives the state machine from rcu_read_unlock(). Such an implementation doesn't need the interrupt driven poll-state driver we currently have and could thus subvert that assumption :-)
Then again, there's a good reason PaulMck didn't pick this implementation.
> In fact I do not even understand why getaffinity() doesn't simply > return ->cpus_allowed, but this is off-topic.
Yeah, me neither :-(, it always surprises me. But changing it is likely to break stuff so there we are.
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