Re: [PATCH] netfilter: use per-cpu recursive spinlock (v6)

Eric Dumazet
2009-04-16T16:21:31Z

Eric Dumazet a écrit :

> I also considered using regular spinlocks and spin_trylock() to "detect"
> the recurse case without a global counter.
>
> lock :
> local_bh_disable();
> int locked = spin_trylock(&__get_cpu_var(arp_tables_lock);
>
> unlock:
>
> if (likely(locked))
> spin_unlock(&__get_cpu_var(arp_tables_lock));
> local_bh_enable();
>
> But we would lose some runtime features, I dont feel comfortable about
> this trylock version. What others people think ?
>

Oh well, this wont work of course, forget about this trylock thing :)