| From: | Andres Freund <andres(at)anarazel(dot)de> |
|---|---|
| To: | Robert Haas <robertmhaas(at)gmail(dot)com> |
| Cc: | Amit Kapila <amit(dot)kapila16(at)gmail(dot)com>, Pavan Deolasee <pavan(dot)deolasee(at)gmail(dot)com>, pgsql-hackers <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: Reduce ProcArrayLock contention |
| Date: | 2015-08-04 15:33:48 |
| Message-ID: | 20150804153348.GA5452@alap3.anarazel.de |
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| Lists: | pgsql-hackers |
On 2015-08-04 11:29:39 -0400, Robert Haas wrote:
> On Mon, Aug 3, 2015 at 8:39 AM, Amit Kapila <amit(dot)kapila16(at)gmail(dot)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
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