Re: [patch 3/4] net: Percpufy frequently used variables -- proto.sockets_allocated

[Andrew Morton <akpm@osdl.org>]

Eric Dumazet <dada1@cosmosbay.com> wrote:
>
> > 
> > An advantage of retaining a spinlock in percpu_counter is that if accuracy
> > is needed at a low rate (say, /proc reading) we can take the lock and then
> > go spill each CPU's local count into the main one.  It would need to be a
> > very low rate though.   Or we make the cpu-local counters atomic too.
> 
> We might use atomic_long_t only (and no spinlocks)

Yup, that's it.

> Something like this ?
> 

It'd be a lot neater if we had atomic_long_xchg().

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