Re: Reduce ProcArrayLock contention

On 2015-08-04 11:29:39 -0400, Robert Haas wrote:
> On Mon, Aug 3, 2015 at 8:39 AM, Amit Kapila <amit.kapila16@gmail.com> wrote:
> 1. I got rid of all of the typecasts.  You're supposed to treat
> pg_atomic_u32 as a magic data type that is only manipulated via the
> primitives provided, not just cast back and forth between that and
> u32.

Absolutely. Otherwise no fallbacks can work.

> 2. I got rid of the memory barriers.  System calls are full barriers,
> and so are compare-and-exchange operations.  Between those two facts,
> we should be fine without these.

Actually by far not all system calls are full barriers?

Regards,

Andres