| From: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
|---|---|
| To: | Heikki Linnakangas <heikki(dot)linnakangas(at)enterprisedb(dot)com> |
| Cc: | Manabu Ori <manabu(dot)ori(at)gmail(dot)com>, Tatsuo Ishii <ishii(at)postgresql(dot)org>, robertmhaas(at)gmail(dot)com, pgsql-hackers(at)postgresql(dot)org |
| Subject: | Re: spinlocks on HP-UX |
| Date: | 2011-12-29 22:26:16 |
| Message-ID: | 29635.1325197576@sss.pgh.pa.us |
| Views: | Raw Message | Whole Thread | Download mbox | Resend email |
| Thread: | |
| Lists: | pgsql-hackers |
Heikki Linnakangas <heikki(dot)linnakangas(at)enterprisedb(dot)com> writes:
> The Linux kernel does this (arch/powerpc/include/asm/ppc-opcode.h):
Yeah, I was looking at that too.
> We can't copy-paste code from Linux directly, and I'm not sure I like
> that particular phrasing of the macro, but perhaps we should steal the
> idea and only use the hint on 64-bit PowerPC processors?
The info that I've found says that the hint exists beginning in POWER6,
and there were certainly 64-bit Power machines before that. However,
it might be that the only machines that actually spit up on the hint bit
(rather than ignore it) were 32-bit, in which case this would be a
usable heuristic. Not sure how we can research that ... do we want to
just assume the kernel guys know what they're doing?
regards, tom lane
| From | Date | Subject | |
|---|---|---|---|
| Next Message | chris r. | 2011-12-29 22:42:42 | SEGFAULT on SELECT * FROM view |
| Previous Message | Tom Lane | 2011-12-29 22:06:15 | Re: failed regress test |