Horton

Re: spinlocks on HP-UX

Tom Lane <tgl@sss.pgh.pa.us>

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From: Tom Lane <tgl@sss.pgh.pa.us>
To: Heikki Linnakangas <heikki.linnakangas@enterprisedb.com>
Cc: Manabu Ori <manabu.ori@gmail.com>, Tatsuo Ishii <ishii@postgresql.org>, robertmhaas@gmail.com, pgsql-hackers@postgresql.org
Date: 2011-12-29T22:26:16Z
Lists: pgsql-hackers

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  1. Typo fixes.

Heikki Linnakangas <heikki.linnakangas@enterprisedb.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