Re: [PATCH] percpu_counter : add percpu_counter_add_fast()

[Christoph Lameter]

On Thu, 21 Oct 2010, Andrew Morton wrote:

> That isn't actually what I was suggesting.  I was suggesting the use of
> an inlined, this_cpu_add()-using percpu_counter_add() variant which
> still does the batched spilling into ->count.  IOW, just speed up the
> current implementation along the lines of
>
> {
> 	val = this_cpu_add_return(*fbc->counters, amount);

this_cpu_add_return() is not in the kernel but could be realized using a
variant offshoot of cmpxchg_local. I had something like that initially but
omitted it since there was no use case.

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