Re: [E1000-devel] [RFC PATCH 1/5] net: implement support for low latency socket polling

[Eric D. <eri...@gm...>]

On Sun, 2013-03-03 at 20:21 +0100, Andi Kleen wrote:
> > Alternative to 2) would be to use a generation id, incremented every
> > time a napi used in spin polling enabled driver is dismantled (and freed
> > after RCU grace period)
> > 
> > And store in sockets not only the pointer to napi_struct, but the
> > current generation id : If the generation id doesnt match, disable
> > the spinpoll until next packet rebuilds the cache again.
> 
> This would require rcu_read_lock, aka preempt off, during polling, right?
> 

Of course, polling probably needs BH disabling as well to get the per
napi lock