From: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
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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 |
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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
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